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 ...

Production method of high-carbon steel wire capable of improving draw ductility

The invention relates to a production method for high-carbon steel wire capable of improving draw ductility, which solves the disadvantages of the network cementite existing currently such as precipitation and the like. The procedure is a production method of high-carbon steel wire capable of improving draw ductility, and the steps are as follows: high-carbon steel wire continuous casting after smelting is heated to a crystal region temperature of 900 to 1000 DEG C; rough rolling is carried out at the temperature of 900 to 1045 DEG C; precision rolling is carried out at a beginning temperature of 800 to 950 DEG and a finishing temperature of 850 to 1000 DEG C; sizing processing is carried out at a beginning temperature of 900 to 1050 DEG C; after cooling through water, spinning is carriedout at a temperature of 850 to 950 DEG C; wind cooling is carried out, and the cooling speed at the temperature of 600 to 950 DEG C is controlled to be 12 to 30 DEG C per second. The method can control ...

High-carbon steel wire for superfine steel wire and manufacturing method thereof

The invention discloses a high carbon steel wire used for an ultrathin steel wire and a manufacturing method thereof. The wire has the following compositions in terms of weight percentage: 0.60 to 1.2 of C, 0.10 to 0.50 of Si, 0.01 to 0.60 of Mn, no more than 0.020 of P, no more than 0.020 of S, no more than 0.002 of Ti, no more than 0.005 of Al, no more than 0.006 of N and Fe and the balance of inevitable impurities. The manufacturing method comprises the following steps: smelting, molten iron desulfurisation and converter top and bottom blowing are carried out by adopting an ultrapure steeltechnique, ladle argon blowing refining and external refining are carried out by adopting low-alkalinity steel slag with 0.5 to 1.6 of CaO/SiO2; square billet is formed by casting; austenitizing withthe temperature of 750 DEG C to 850 DEG C is carried out on the square billet by using a heating furnace; control rolling and control cooling treatment is carried out on the high speed wire; the rolling ...

Drahtstahl for high strength fastening piece and production method thereof

The invention relates to a drahtstahl for a fastening piece and a production method thereof, and the drahtstahl comprises the following components by weight percent: 0.39-0.48 % of C, 0.15-0.35% of Si, 0.30-0.90% of Mn, 0.60-1.20% of Cr, 0.010-0.07% of Als, less than or equal to 0.035% of P, less than or equal to 0.035% of S and the balance Fe and unavoidable impurity; and the production method comprises the following steps: smelting with a clean steel process and casting into a blank, and adding Si-Ca line in the refining; heating the continuous casting to 980-1,080 DEG C; rough rolling: controlling the deflection to be 70-80%; intermediate rolling: controlling the deflection to be 80-90%; pre-precision rolling: controlling the deflection to be 65-75%; water-cooling until the temperature is cooled to be 1,000-1,020 DEG C; precision rolling: controlling the deflection to be 60-90%; water-cooling for the second time until the temperature is cooled to be 800-900 DEG C; spinning; cooling to ...

High-carbon steel wire for superfine steel wire and manufacturing method thereof

The invention discloses a high carbon steel wire used for an ultrathin steel wire and a manufacturing method thereof. The wire has the following compositions in terms of weight percentage: 0.60 to 1.2 of C, 0.10 to 0.50 of Si, 0.01 to 0.60 of Mn, no more than 0.020 of P, no more than 0.020 of S, no more than 0.002 of Ti, no more than 0.005 of Al, no more than 0.006 of N and Fe and the balance of inevitable impurities. The manufacturing method comprises the following steps: smelting, molten iron desulfurisation and converter top and bottom blowing are carried out by adopting an ultrapure steel technique, ladle argon blowing refining and external refining are carried out by adopting low-alkalinity steel slag with 0.5 to 1.6 of CaO/SiO2; square billet is formed by casting; austenitizing with the temperature of 750 DEG C to 850 DEG C is carried out on the square billet by using a heating furnace; control rolling and control cooling treatment is carried out on the high speed wire; the 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 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 ...

Production method of high-carbon steel wire capable of improving draw ductility

The invention relates to a production method for high-carbon steel wire capable of improving draw ductility, which solves the disadvantages of the network cementite existing currently such as precipitation and the like. The procedure is a production method of high-carbon steel wire capable of improving draw ductility, and the steps are as follows: high-carbon steel wire continuous casting after smelting is heated to a crystal region temperature of 900 to 1000 DEG C; rough rolling is carried out at the temperature of 900 to 1045 DEG C; precision rolling is carried out at a beginning temperature of 800 to 950 DEG and a finishing temperature of 850 to 1000 DEG C; sizing processing is carried out at a beginning temperature of 900 to 1050 DEG C; after cooling through water, spinning is carried out at a temperature of 850 to 950 DEG C; wind cooling is carried out, and the cooling speed at the temperature of 600 to 950 DEG C is controlled to be 12 to 30 DEG C per second. The method can control ...

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.

Niobium, vanadium composite micro-alloying low-carbon boron steel for cold heading and production method thereof

Niobium-vanadium microalloyed low-carbon boron steel used for cold heading and a preparation method thereof pertain to steel smelting and material field. In order to solves the problems of low standard grade, high production cost and poor product quality of the existing low-carbon boron steel products, the niobium-vanadium microalloyed low-carbon boron steel of the invention comprises the components according to certain weight proportion: 0.18-0.24 of C, 0.80-1.2 of Mn, 0.01-0.03 of Ti, 0.001-0.003 of B, 0.02-0.08 of Nb, 0.02-0.08 of V, 0.01-0.05 of Als, Si is less than 0.20, P is less than 0.03 and S is less than 0.03, the rest is Fe. The process method comprises the technique process in sequence under specific technology parameters: smelting by a converter or an electric furnace; fine smelting by an LF furnace; continuous casting; heating; rolling, controlled cooling. The invention utilizes the compound microalloyed function of niobium and vanadium and ensures the comprehensive performance ...

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 ...

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 ...

Niobium, vanadium composite micro-alloying low-carbon boron steel for cold heading and production method thereof

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 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 ...