Ferromanganese for refining deoxidizing of Si-Mn deoxidized steel and using method thereof

The invention provides a ferromanganese for the refining deoxidizing of Si-Mn deoxidized steel and a using method thereof. The ferromanganese comprises the following components in percentage by weight: 94-99% of Mn, P<0.01%, S<0.01%, Al<0.02%, N<0.02%, and the balance of iron and inevitable impurities. The using method comprises the following steps of: 1, drying (at the temperature of 80-200 DEG C for 1-5 hours); 2, adding the ferromanganese (measuring the components of liquid steel for three times after the tapping of a rotating furnace, 10-20 minutes after LF (Low Frequency) refining is started and 10-20 minutes before the LF refining is finished, and respectively adding the ferromanganese according to specified requirements); and 3, processing the refined liquid steel (standing the liquid steel, and carrying out soft argon blowing). The contents of residual Al and N contained in the Si-Mn deoxidized steel are obviously reduced through a method carrying out refining deoxidizing alloying ...

Submerged arc welding wire for pipe line steel and method for manufacturing submerged arc welding wire

Production method for wire rod for high-strength pre-stress steel strand

The invention provides a production method for a wire rod for a high-strength pre-stress steel strand. 0.04-0.08wt% of V and 0.15-0.35 wt% of Cr are added in original components of SWRH82B steel. The temperature of a rolled piece going out from a pre-finishing mill is 980-1020 DEG C, the temperature of the rolled piece going into a finishing mill is 880-920 DEG C, the temperature of the rolled piece going into a double-module rolling mill is 850-870 DEG C, and the spinning temperature is 850-870 DEG C. A cooling water tank is arranged behind a spinning machine additionally, the water level is arranged for 90%, the water temperature is controlled to be 80-95 DEG C, and the transport roller way speed is 0.33-0.55m/s. Through the production method, a qualified wire rod with a diameter of 16mm and for a high-strength pre-stress steel strand can be produced, the tensile strength can reach 1330 MPa, a 1890MPa level high-strength pre-stress steel strand can be produced after wire drawing, the ...

Manganese boron deoxidizer and using method thereof

The invention discloses a manganese boron deoxidizer and a using method thereof. The manganese boron deoxidizer comprises the following chemical components in percentage by weight: 87 to 97 percent of manganese, 2 to 12 percent of boron and less than or equal to 1.5 percent of impurities and has the granularity of 50 to 100 mm. The using method comprises the following steps of: baking the raw materials at 80 to 160 DEG C for 6 to 15 hours till the water content is less than 0.5 percent; adding the deoxidizer under the condition that the oxygen activity of steel liquid is (5-30)*10<6>, wherein the addition amount is 1 to 4 kg/t; during refining the steel liquid, adding the deoxidizer under a condition that the temperature of the steel liquid is between 1540 and 1610 DEG C based on the standard of 2 to 6 kg/t and stirring by introducing argon at the same time, wherein the flow rate of the argon is kept in the range from 200 to 400 NL/min, and the stirring time is 5 to 20 minutes; and under ...

Gas shielded welding wire with higher weather resistance

The invention discloses a gas shielded welding wire with higher weather resistance, which is characterized by comprising the following chemical components by weight percent: 0.03%-0.08% of C, 0.3%-0.7% of Si, 1.3%-1.6% of Mn, less than or equal to 0.015% of S, less than or equal to 0.02% of P, 0.2%-0.5% of Cu, 0.4%-0.8% of Cr, 0.2%-1.0% of Ni, 0.03%-0.1% of Ti and the balance of iron and inevitable impurities, wherein the ratio of Cr to Ni is controlled at 2-3, and the ratio of Ni to Cu is controlled at 0.5-2. The deposited metal and welding joint of the welding wire provided by the invention have good mechanical properties and corrosion resistance. The tensile strength of the deposited metal is greater than 550MPa, and the impact toughness of the deposited metal at the temperature of -40 DEG C is more than 60J. The welding wire has wide welding parameter regulating range, stable welding processes and beautiful formed welding seams and is suitable for all-position welding.

Tungsten carbide roller

The invention relates to a tungsten carbide roller. The tungsten carbide roller comprises the following components of: 84.5 to 85.5 percent of WC, 6.8 to 7.5 percent of Co, 6.8 to 7.5 percent of Ni, 0.2 to 0.5 percent of TiC, 0.2 to 0.5 percent of CrC, and 0.1 to 0.3 percent of VC. The mixed raw material powder is molded by an isostatic pressing process, and a roller blank is subjected to vacuum sintering treatment at the temperature of between 1,390 and 1,490 DEG C. Because a mixture of cobalt and nickel elements, titanium carbide, chrome carbide and vanadium carbide of hard alloy phase with extremely good bonding performance is added, the composition of the tungsten carbide roller is improved, and a reasonable internal tissue structure is formed. By reasonably selecting the sintering temperature in the vacuum state, defects of under sintering, over sintering and deformation are avoided, the tungsten carbide roller with good comprehensive performance is obtained, the rolling quantity of ...

Using method of manganese boron deoxidizer

Control method of high speed wire bar hot rolling surface red rust

The invention relates to a high speed wire heat rolling surface Fe2O3 control method, which is characterized in that: control cooling water quality and wire rolling whole process temperature steps; adopt water-cool control between rough rolling and refined rolling; comparing with prior art, the invention has the advantages that: the invention controls the cooling water quality, reduce the surface furr generated by the chemical reaction between water and Fe; control the temperature steps of the rolling piece during the process of rolling, reduce the generation of surface Fe2O3. Without adopting the invention, the high speed wire heat rolling surface Fe2O3 is 2 per cent, after adopting the invention, the surface Fe2O3 is reduced to 0.04 per cent, which overcomes the Fe2O3 defect basically.

Controlled-cooling method for rolled high carbon steel wire rod

The invention discloses a controlled-cooling method for a rolled high carbon steel wire rod, which comprises controlled-cooling on a roller way after spinning. The method is characterized in that: the cooling roller way is sunken; a water tank is arranged at a sunken part; the roller way is accommodated in the water tank containing water; and the spun wire rod enters the water tank for the controlled-cooling, and is discharged out of the water tank and cooled to room temperature. The controlled-cooling method for the rolled high carbon steel wire rod increases the sorbitizing rate of the highcarbon steel wire rod from 80 to 85 percent in an air cooling process to over 95 percent.