Corrosion resistant heavy rail steel with excellent strength-toughness, fatigue resistance and abrasive resistance

The invention discloses a corrosion resistant heavy rail steel with excellent strength-toughness, fatigue resistance and abrasive resistance, belonging to the technical field of heavy rail steel. A fundamental alloy system comprises the following alloy elements by weight percent: 0.55%-0.72% of C, 0.35%-1.1% of Si, 0.7%-1.40% of Mn, 0.2%-0.65% of Cr, 0.2%-0.65% of Cu and Fe as the balance; on the basis of the above fundamental ingredients, one or more than one microalloy elements are simultaneously added, including: 0.01%-0.055% of Nb, 0.05%-0.10% of V, 0.001%-0.05% of Ti, 0.1%-0.3% of Ni and 0.15%-0.3% of Mo. The heavy rail steel has the advantage that: mechanical properties of steel rail including strength, toughness, fatigue resistance, abrasive resistance, fracture toughness property and welding property are remarkably enhanced, so that superfine pearlite can be obtained without the need of adopting complex production technology such as rail end quenching. And simultaneously, the steel ...

Hot rolled high-ductility carbon steel for passenger traffic steel rails

The invention relates to the field of ferrous metallurgy. A hot rolled high-ductility carbon steel for passenger traffic steel rails comprises the following chemical components in percentage by weight: 0.60 to 0.80 percent of C, 0.10 to 0.60 percent of Si, 0.70 to 1.70 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.006 percent of N, less than or equal to 0.004 percent of Al, less than or equal to 0.007 percent of As, less than or equal to 0.00015 percent of H and the balance of Fe and inevitable impurities. The hot rolled high-ductility carbon steel does not need to be added with alloy elements or be subjected to heat treatment, and has a tensile strength of more than or equal to 880MPa and the elongation percentage A of more than or equal to 9 percent.

Low-temperature impact resistant steel for hot-rolling U-type steel sheet pile and production method thereof

The invention relates to low-temperature impact resistant steel for a hot-rolling U-type steel sheet pile and a production method thereof. The steel is prepared from the following components by weight percent: 0.15-0.20% of C, 0.8-1.5% of Mn, 0.26-0.46% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S, 0.015-0.05% of Als, 0.015-0.035% of Nb, 0.0005-0.0012% of B, 0.001-0.005% of Ca, less than or equal to 0.005% of [O] and less than or equal to 0.004% of N. The method comprises the following steps: melting: refining in a converter, carrying out vacuum deoxidation, and controlling the total oxygen content in the molten steel to be less than or equal to 0.005%; continuously casting; and heating the casting blank to 1180-1280 DEG C, and rolling in two sections in the austenite recrystallization area and non-recrystallization area. The Akv (-40DEG C) (in a longitudinal direction) of the invention is more than 80J, the grain fineness number grade is more than 8 grade, ...

Aluminiferous low-carbon cold heading wire rod steel and production method thereof

The invention relates to a wire rod steel and a production method thereof, aiming at overcoming the defect that at present, spinning has overhigh temperature, so as not to be beneficial to reducing iron scale or adopting overhigh roller speed as well as full phase transition of the steel and growing up of ferrite, thus reducing the properties of drawing and cold heading of steel. The measurement is that the aluminiferous low-carbon cold heading wire rod steel has the chemical components based on the weight percentage: 0.04-0.08% of C, 0.01-0.05% of Si, 0.35-0.55% of Mn, less than or equal to 0.030% of P, less than or equal to 0.035% of S, 0.02-0.06% of Als and the rest of Fe and unavoidable impurity. The technique is that continuously cast bloom is heated up to 950-1040 DEG C with the section temperature being less than or equal to 30 DEG C; the start rolling temperature is 900-1000 DEG C, and the finishing temperature is 950-990 DEG C; after the water is cooled, the spinning is at 880- ...

Method for improving homogeneity of steel structure and equipment thereof

The invention relates to a method for improving the homogeneity of steel structure and equipment used thereby. The method comprises the steps of casting, crystallization, drawing, secondary cooling, drawing and straightening and cutting and a step of cutting a cast ingot blank by using a cutting saw along the central line of a cross section to divide the cross section of the ingot blank into equal parts, namely an added step of sawing along the central cross section of the ingot blank in casting production. The equipment comprises a steel barrel, an intermediate ladle under the water opening of the steel barrel, a crystallizer under the water opening of the intermediate ladle, a secondary cooling device under the crystallizer, a drawing and straightening roll, a bending roll and a strengthening roll, wherein the flame cutting machine is arranged in the outlet direction of the straightening roll; the cutting saw is also arranged in the outlet direction of the straightening roll; and the ...

Carbon-free molten steel holding agent and its production method

Rigid line product microscopic structure and mechanical property forecasting system

The invention relates to a temperature, texture and performance forecasting system for directly rolling high carbon steel wire using continuous cast blank, and its solution: taking rolled piece for testing and analyzing microstructure and mechanical performance, and determining surface temperature of the rolled piece; establishing a temperature model, an austenitic texture developing model, an austenitic resolving model and a mechanical performance-microscopical texture relation model for directly rolling high carbon steel wire by continuous cast blank; writing a control program for hard wiremcroscopical texture development and wire mechanical performance forecast in VB language and simulating the rolling; then respectively giving all the temperature data, wind cooling speed, cooling water quantity, deforming speed and deforming quantity. The invention has the characters of forecasting microscopical texture and mechanical performance of high carbon steel wire and being able to proposecorresponding ...

Method for observing vanadium excluded phase in vanadium and nitrogen containing high-carbon steel wire rod

The invention relates to a method of observing vanadium excluded phase in high-carbon steel bull rods containing vanadium and nitrogen, comprising the following steps: a. warming high-carbon steel bull rods containing vanadium or the high-carbon steel bull rod samples containing vanadium and nitrogen, to 1100 DEG C to 1150 DEG C, then keeping warm, performing high temperature solution treatment; b. slowly cooling to 850 DEG C to 950 DEG C for heat preservation, finally cooling to room temperature; c. observing the cooled samples under an electron microscope, obtaining pictures and energy spectrum images of the excluded phase. The vanadium excluded phase can be seen through the invention, through researching excluding behavior of vanadium in the high-carbon steel bull rods, vanadium steel strengthening mechanism and effect on organization and mechanical property of the high-carbon steel bull rods are accordingly gripped, thereby providing proof for producing control.

Low-temperature impact resistant steel for hot-rolling U-type steel sheet pile and production method thereof

The invention relates to low-temperature impact resistant steel for a hot-rolling U-type steel sheet pile and a production method thereof. The steel is prepared from the following components by weight percent: 0.15-0.20% of C, 0.8-1.5% of Mn, 0.26-0.46% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S, 0.015-0.05% of Als, 0.015-0.035% of Nb, 0.0005-0.0012% of B, 0.001-0.005% of Ca, less than or equal to 0.005% of [O] and less than or equal to 0.004% of N. The method comprises the following steps: melting: refining in a converter, carrying out vacuum deoxidation, and controlling the total oxygen content in the molten steel to be less than or equal to 0.005%; continuously casting; and heating the casting blank to 1180-1280 DEG C, and rolling in two sections in the austenite recrystallization area and non-recrystallization area. The Akv (-40DEG C) (in a longitudinal direction) of the invention is more than 80J, the grain fineness number grade is more than 8 grade, ...

Stelmor cooling control technique

The invention relates to a stelmor cooling control technique comprising a wind cooling process and a water cooling process. In the water cooling process, in at least one water cooling section, each water-spraying nozzle sprays water to the wires walking on a cooling roller table at the spraying angle of 15-25 degrees in the alternating arrangement way of 85-95 degrees, wherein the spraying angle is the angle between a water-spraying nozzle axis and a wire walking direction; and in the wind cooling process, a wind-blowing nozzle blows wind to the wires walking on a cooling roller table from thedirections of up and down, left and right, of the cooling roller table. The stelmor cooling control technique can effectively destroy the cooling state of a film on the surface of a steel bar, form anuclear cooling state of directly contacting with the steel, can reduce or suppress the precipitation of reticular tissues, and ensures that the main control tissue is a homogeneous sorbite tissue, so as ...

Steel for cup-shaped iron core of loudspeaker and production method thereof

The invention discloses steel for a cup-shaped iron core of a loudspeaker and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.02 to 0.12 percent of C, less than or equal to 0.025 percent of H, less than or equal to 0.10 percent of Si, less than or equal to 0.9 percent of Mn, less than or equal to 0.015 percent of S, less than or equal to 0.020 percent of P, 0.01 to 0.07 percent of Al, and the balance of Fe and unavoidable impurities. The production method of the steel comprises the steps of converter or electric furnace smelting, refining of an electric heating furnace, argon blowing refining, vacuum refining, continuous casting, heating, rolling and controlled cooling; and the production technology is simple and easy to control. The product integrally improves product performance by controlling the content of the C and the H and the content of the Si, the Mn, the S, the P and the Al components, and effectively avoids the cracking ...

Corrosion resistant heavy rail steel with excellent strength-toughness, fatigue resistance and abrasive resistance

The invention discloses a corrosion resistant heavy rail steel with excellent strength-toughness, fatigue resistance and abrasive resistance, belonging to the technical field of heavy rail steel. A fundamental alloy system comprises the following alloy elements by weight percent: 0.55%-0.72% of C, 0.35%-1.1% of Si, 0.7%-1.40% of Mn, 0.2%-0.65% of Cr, 0.2%-0.65% of Cu and Fe as the balance; on thebasis of the above fundamental ingredients, one or more than one microalloy elements are simultaneously added, including: 0.01%-0.055% of Nb, 0.05%-0.10% of V, 0.001%-0.05% of Ti, 0.1%-0.3% of Ni and0.15%-0.3% of Mo. The heavy rail steel has the advantage that: mechanical properties of steel rail including strength, toughness, fatigue resistance, abrasive resistance, fracture toughness property and welding property are remarkably enhanced, so that superfine pearlite can be obtained without the need of adopting complex production technology such as rail end quenching. And simultaneously, the steel ...

Carbon-free molten steel holding agent and its production

The molten steel holding agent has the chemical components of SiO2 20-35 wt% and Al2O3 45-65 wt%; unit weight less than 0.6g/ml; melting point higher than 1450 deg.c and size of 1-8 mm. It is produced in one of two processes, one is sintering process including the steps of pelletizing by adding natural organic flammable to refractory aluminium silicate material and high-temperature calcination toeliminate carbon, and the other is mixing process including the steps of mixing light refractory material as core with refractory aluminium silicate material and pelletizing. The present invention has no molten steel carburetting and less environmental pollution and is used for holding molten steel in steel ladle and tundish, and especially suitable for holding molten steel of low carbon and ultravlow carbon steel.

Inspection and appraisement method for cementite in high-carbon steel wire bar

The invention relates to a method for inspecting steel material quality, particularly to a method for inspecting and evaluating cementite in a high-carbon steel wire rod. The method comprises the steps of preparing sodium hydroxide, trinitrophenol and trinitroacid into erosion liquid by the weight ratio of (10-20):1:1; heating the sample of the high-carbon steel wire rod to 20-100DEG C for more than 3 min; subjecting the heated sample to hot etching and conducting observation under a microscope. Cementite network is black, and ferrite network and the other organizations are not stained. Under the microscope, the crystal boundary cementite in the sample can be clearly inspected.

Production method of steel for cold heading blind rivets

The invention specifically relates to steel for large flange blind rivets and a production method thereof. The steel comprises the following components by weight percent: 0.02-0.15% of C, 0.03-0.10% of Si, 0.5-1.5% of Mn, not more than 0.020% of P, not more than 0.015% of S, 0.01-0.07% of Al, 0.001-0.008% of Ca and the balance of Fe and impurities; and the production method comprises the following steps: smelting; refining in a converter: adding aluminum-manganese-iron alloy once at the beginning of refining, adding Al wires at 5-10 minutes before the end of the refining, and adding Si-Ca wires at 2.5-7 minutes before the end of the refining; continuous casting: heating a continuously cast billet; rolling: finish rolling and wire laying; and Stelmor cooling. The production method can reduce the breaking rate when drawing wires and the cold heading cracking rate, and the production process is simple and conductive to popularization; and the production method can improve the strength, save ...

Boracic cold heading wire rod steel and production method thereof

The invention relates to a wire rod steel and a production method thereof, aiming at overcoming the defects that at present, spinning is carried out at the high temperature of 900-980 DEG C, the cooling velocity is high, and the wire rod steel has high original intensity and surface hardness, is easy to have the phenomenon of filament breakage when in the process of drawing, etc. The measurement is that the boracic cold heading wire rod steel has the chemical components based on the weight percentage: 0.18-0.23% of C, 0.01-0.085% of Si, 1.05-1.10% of Mn, less than or equal to 0.030% of P, less than or equal to 0.035% of S, 0.0006-0.0025% of B, less than or equal to 0.008% of N, 0.03-0.06% of Ti and the rest of Fe and unavoidable impurity. The technique is that continuously cast bloom is heated up to 1000-1035 DEG C with the section temperature being less than or equal to 30 DEG C; the start rolling temperature is 1000-1050 DEG C, and the finishing temperature is 960-990 DEG C; after the ...

Steel with yield ratio no larger than 0.8 for hot rolling U-shaped steel sheet pile and production method thereof

The invention belongs to steel with a yield ratio no larger than 0.8 for hot rolling a U-shaped steel sheet pile and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.12-0.20% of C, 1.0-1.8% of Mn, 0.22-0.5% of Si, no more than 0.02% of P, no more than 0.02% of S, 0.01-0.06% of Als, 0.02-0.18% of V, 0.01-0.08% of Ca and the balance of Fe and inevitable impurities; and the preparation method thereof comprises the following steps: smelting; refining in a converter; starting to add Al wires based on 3-5m/ton steel from the moment 5-10 minutes before finishing refining in the converter; starting to add Si-Ca wires based on 3-5m/ton steel from the moment 2.5-7 minutes before finishing refining in the converter; carrying out continuous casting; heating continuously cast blooms to 1150-1250 DEG C; and rolling.

Stelmor cooling control technique

The invention relates to a stelmor cooling control technique comprising a wind cooling process and a water cooling process. In the water cooling process, in at least one water cooling section, each water-spraying nozzle sprays water to the wires walking on a cooling roller table at the spraying angle of 15-25 degrees in the alternating arrangement way of 85-95 degrees, wherein the spraying angle is the angle between a water-spraying nozzle axis and a wire walking direction; and in the wind cooling process, a wind-blowing nozzle blows wind to the wires walking on a cooling roller table from the directions of up and down, left and right, of the cooling roller table. The stelmor cooling control technique can effectively destroy the cooling state of a film on the surface of a steel bar, form a nuclear cooling state of directly contacting with the steel, can reduce or suppress the precipitation of reticular tissues, and ensures that the main control tissue is a homogeneous sorbite tissue, so ...

Alkaline soil corrosion-resistant steel for hot-rolled U-shaped steel sheet pile and manufacture method thereof

The invention relates to a manufacture method of alkaline soil corrosion-resistant steel for a hot-rolled U-shaped steel sheet pile. The manufacture method comprises the steps of: smelting in a converter and refining; controlling the chemical composition and the weight percentage of the molten steel after refining as follows: 0.15-0.26% of C, 0.8-1.4% of Mn, 0.10-0.6% of Si, less than or equal to 0.020% of S, less than or equal to 0.02% of P, 0.2-0.5% of Cu, 0.1-0,25% of Ni, and the balance Fe and unavoidable impurities; controlling the alkalinity R of final slag to be at 2-5; continually casting; controlling the depth that a long water opening is inserted into a crystallizer to be at 100-300mm; heating a continually-cast blank at 1050-1150 DEG C; and rolling, wherein the rolling temperature is 1020-1100 DEG C, and the rolling is performed under the melting point temperature of the copper less than 1083 DEG C. The alkaline soil corrosion-resistant steel can not generate the phenomena of ...

Method for producing wire and bar materials

The invention relates to a method for producing wire and bar materials, which sequentially comprises the steps of smelting, secondary refining, square billet continuous casting, heavy forcing down, rolling and controlled cooling, and finished product collecting and coiling. The method adopts a heavy forcing down process to save the steps of casting blank stacking slow cooling, square billet downward delivery and square billet heating after the step of the square billet continuous casting, and organically compresses and combines a past steel plant with a past high-wire plant or bar material plant to form a short-flow production method of the wire and bar materials and greatly reduce the energy source consumption; besides, the production cost is far lower than that of the conventional long-flow process and is more lower than that of an overlong-flow process with secondary fire material formation, the benefit advantages are obvious, and the quality in producing high-carbon wire and bar materials ...

Steel with yield ratio no larger than 0.8 for hot rolling U-shaped steel sheet pile and production method thereof

The invention belongs to steel with a yield ratio no larger than 0.8 for hot rolling a U-shaped steel sheet pile and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.12-0.20% of C, 1.0-1.8% of Mn, 0.22-0.5% of Si, no more than 0.02% of P, no more than 0.02% of S, 0.01-0.06% of Als, 0.02-0.18% of V, 0.01-0.08% of Ca and the balance of Fe and inevitable impurities; and the preparation method thereof comprises the following steps: smelting; refining in a converter; starting to add Al wires based on 3-5m/ton steel from the moment 5-10 minutes before finishing refining in the converter; starting to add Si-Ca wires based on 3-5m/ton steel from the moment 2.5-7 minutes before finishing refining in the converter; carrying out continuous casting; heating continuously cast blooms to 1150-1250 DEG C; and rolling.

Aluminiferous low-carbon cold heading wire rod steel and production method thereof

The invention relates to a wire rod steel and a production method thereof, aiming at overcoming the defect that at present, spinning has overhigh temperature, so as not to be beneficial to reducing iron scale or adopting overhigh roller speed as well as full phase transition of the steel and growing up of ferrite, thus reducing the properties of drawing and cold heading of steel. The measurement is that the aluminiferous low-carbon cold heading wire rod steel has the chemical components based on the weight percentage: 0.04-0.08% of C, 0.01-0.05% of Si, 0.35-0.55% of Mn, less than or equal to 0.030% of P, less than or equal to 0.035% of S, 0.02-0.06% of Als and the rest of Fe and unavoidable impurity. The technique is that continuously cast bloom is heated up to 950-1040 DEG C with the section temperature being less than or equal to 30 DEG C; the start rolling temperature is 900-1000 DEG C, and the finishing temperature is 950-990 DEG C; after the water is cooled, the spinning is at 880- ...

Steel for cup-shaped iron core of loudspeaker and production method thereof

The invention discloses steel for a cup-shaped iron core of a loudspeaker and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.02 to 0.12 percent of C, less than or equal to 0.025 percent of H, less than or equal to 0.10 percent of Si, less than or equal to 0.9 percent of Mn, less than or equal to 0.015 percent of S, less than or equal to 0.020 percent of P, 0.01 to 0.07 percent of Al, and the balance of Fe and unavoidable impurities. The production method of the steel comprises the steps of converter or electric furnace smelting, refining of an electric heating furnace, argon blowing refining, vacuum refining, continuous casting, heating, rolling and controlled cooling; and the production technology is simple and easy to control. The product integrally improves product performance by controlling the content of the C and the H and the content of the Si, the Mn, the S, the P and the Al components, and effectively avoids the cracking ...

Production method of copper clad steel

Hot rolled high-ductility carbon steel for passenger traffic steel rails

The invention relates to the field of ferrous metallurgy. A hot rolled high-ductility carbon steel for passenger traffic steel rails comprises the following chemical components in percentage by weight: 0.60 to 0.80 percent of C, 0.10 to 0.60 percent of Si, 0.70 to 1.70 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.006 percent of N, less than or equal to 0.004 percent of Al, less than or equal to 0.007 percent of As, less than or equal to 0.00015 percent of H and the balance of Fe and inevitable impurities. The hot rolled high-ductility carbon steel does not need to be added with alloy elements or be subjected to heat treatment, and has a tensile strength of more than or equal to 880MPa and the elongation percentage A of more than or equal to 9 percent.

Method for improving homogeneity of steel structure and equipment thereof

The invention relates to a method for improving the homogeneity of steel structure and equipment used thereby. The method comprises the steps of casting, crystallization, drawing, secondary cooling, drawing and straightening and cutting and a step of cutting a cast ingot blank by using a cutting saw along the central line of a cross section to divide the cross section of the ingot blank into equal parts, namely an added step of sawing along the central cross section of the ingot blank in casting production. The equipment comprises a steel barrel, an intermediate ladle under the water opening of the steel barrel, a crystallizer under the water opening of the intermediate ladle, a secondary cooling device under the crystallizer, a drawing and straightening roll, a bending roll and a strengthening roll, wherein the flame cutting machine is arranged in the outlet direction of the straightening roll; the cutting saw is also arranged in the outlet direction of the straightening roll; and the ...

Method for observing vanadium excluded phase in vanadium and nitrogen containing high-carbon steel wire rod

The invention relates to a method of observing vanadium excluded phase in high-carbon steel bull rods containing vanadium and nitrogen, comprising the following steps: a. warming high-carbon steel bull rods containing vanadium or the high-carbon steel bull rod samples containing vanadium and nitrogen, to 1100 DEG C to 1150 DEG C, then keeping warm, performing high temperature solution treatment; b. slowly cooling to 850 DEG C to 950 DEG C for heat preservation, finally cooling to room temperature; c. observing the cooled samples under an electron microscope, obtaining pictures and energy spectrum images of the excluded phase. The vanadium excluded phase can be seen through the invention, through researching excluding behavior of vanadium in the high-carbon steel bull rods, vanadium steelstrengthening mechanism and effect on organization and mechanical property of the high-carbon steel bull rods are accordingly gripped, thereby providing proof for producing control.

Alkaline soil corrosion-resistant steel for hot-rolled U-shaped steel sheet pile and manufacture method thereof

The invention relates to alkaline soil corrosion-resistant steel for a hot-rolled U-shaped steel sheet pile and a manufacture method thereof. The chemical composition and the weight percentage of the steel are as follows: 0.15-0.26% of C, 0.8-1.4% of Mn, 0.10-0.6% of Si, less than or equal to 0.020% of S, less than or equal to 0.02% of P, 0.2-0.5% of Cu, 0.1-0,25% of Ni, balance Fe and unavoidable impurities. The manufacture method comprises the steps of: smelting in a converter and refining; controlling the alkalinity R of final slag to be at 2-5; continually casting; controlling the depth that a long water opening is inserted into a crystallizer to be at 100-300mm; heating a continually-cast blank at 1050-1150 DEG C; and rolling, wherein the rolling temperature is 1020-1100 DEG C, and the rolling is performed under the melting point temperature of the copper less than 1083 DEG C. The alkaline soil corrosion-resistant steel can not generate the phenomena of steel water overturning and ...

Steel for cold heading blind rivets and production method thereof

The invention specifically relates to steel for large flange blind rivets and a production method thereof. The steel comprises the following components by weight percent: 0.02-0.15% of C, 0.03-0.10% of Si, 0.5-1.5% of Mn, not more than 0.020% of P, not more than 0.015% of S, 0.01-0.07% of Al, 0.001-0.008% of Ca and the balance of Fe and impurities; and the production method comprises the following steps: smelting; refining in a converter: adding aluminum-manganese-iron alloy once at the beginning of refining, adding Al wires at 5-10 minutes before the end of the refining, and adding Si-Ca wires at 2.5-7 minutes before the end of the refining; continuous casting: heating a continuously cast billet; rolling: finish rolling and wire laying; and Stelmor cooling. The production method can reduce the breaking rate when drawing wires and the cold heading cracking rate, and the production process is simple and conductive to popularization; and the production method can improve the strength, save ...

Method for producing wire and bar materials

The invention relates to a method for producing wire and bar materials, which sequentially comprises the steps of smelting, secondary refining, square billet continuous casting, heavy forcing down, rolling and controlled cooling, and finished product collecting and coiling. The method adopts a heavy forcing down process to save the steps of casting blank stacking slow cooling, square billet downward delivery and square billet heating after the step of the square billet continuous casting, and organically compresses and combines a past steel plant with a past high-wire plant or bar material plant to form a short-flow production method of the wire and bar materials and greatly reduce the energy source consumption; besides, the production cost is far lower than that of the conventional long-flow process and is more lower than that of an overlong-flow process with secondary fire material formation, the benefit advantages are obvious, and the quality in producing high-carbon wire and bar materials ...

Boracic cold heading wire rod steel and production method thereof

The invention relates to a wire rod steel and a production method thereof, aiming at overcoming the defects that at present, spinning is carried out at the high temperature of 900-980 DEG C, the cooling velocity is high, and the wire rod steel has high original intensity and surface hardness, is easy to have the phenomenon of filament breakage when in the process of drawing, etc. The measurement is that the boracic cold heading wire rod steel has the chemical components based on the weight percentage: 0.18-0.23% of C, 0.01-0.085% of Si, 0.80-1.10% of Mn, less than or equal to 0.030% of P, less than or equal to 0.035% of S, 0.0006-0.0025% of B, less than or equal to 0.008% of N, 0.03-0.06% of Ti and the rest of Fe and unavoidable impurity. The technique is that continuously cast bloom is heated up to 1000-1100 DEG C with the section temperature being less than or equal to 30 DEG C; the start rolling temperature is 1000-1050 DEG C, and the finishing temperature is 960-990 DEG C; after the ...