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Manufacture method of 50CrVA alloy structural steel type hot rolled round steel bar

A technology of alloy structural steel and a manufacturing method, which is applied in the manufacturing field of 50CrVA alloy structural hot-rolled round steel bars, can solve the problems of large consumption of electricity-consuming graphite electrodes, unfavorable energy conservation and environmental protection, and high production cost, and achieves low production cost, Low power consumption and stable quality

Active Publication Date: 2013-12-18
WUKUN STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are research reports on the production process of 50CrVA alloy structural round steel bars in China, but it mainly adopts "ultra-high-power large electric furnace smelting and rolling process through bar rolling mills" to produce materials, and its disadvantages are large investment and high production costs. , high power consumption and graphite electrode consumption and a lot of dust, which is not conducive to energy conservation and environmental protection; and currently there is no reference in the Chinese patent database to the production of 50CrVA alloys by the low-cost manufacturing process of "converter smelting + LF refining + transverse rolling mill" Manufacturing method of structural round steel bars

Method used

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  • Manufacture method of 50CrVA alloy structural steel type hot rolled round steel bar
  • Manufacture method of 50CrVA alloy structural steel type hot rolled round steel bar
  • Manufacture method of 50CrVA alloy structural steel type hot rolled round steel bar

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Experimental program
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Effect test

Embodiment 1

[0048] A. Molten steel smelting: the chemical composition C5.0wt%, Si0.65wt%, Mn 0.50wt%, P 0.150wt%, S0.012wt%, the rest is Fe and unavoidable impurities of molten iron, chemical composition C00.40wt%, Si0.40wt%, Mn0.70wt%, P0.040wt%, S0.040wt%, the rest is Fe and unavoidable impurity steel scrap and chemical components C4.0wt%, Si0. 65 wt%, Mn 0.60 wt%, P 0.090wt%, S0.040wt%, the rest is Fe and unavoidable impurities of pig iron into the converter, the conventional top-bottom compound blowing, adding lime, white cloud Stone and magnesite ball slagging, the carbon content at the end point is controlled to 0.12wt%, and the tapping temperature is 1659°C; lime and fluorite are added to the bottom of the ladle before tapping, and the amount of lime added is: 5.0kg / t 钢 , the amount of fluorite added: 0.4kg / t 钢 ;The process of slag washing and full bottom argon blowing is adopted when tapping the steel, and the flow rate of argon gas is controlled at 30NL / min. When the amount of m...

Embodiment 2

[0058] A. Molten steel smelting: It is molten iron with chemical components C 4.5wt%, Si 0.50 wt%, Mn 0.425 wt%, P 0.115wt%, S0.008wt%, and the rest is Fe and inevitable impurities. C0.325wt%, Si0.30wt%, Mn0.55wt%, P 0.033wt%, S 0.030wt%, the rest is Fe and unavoidable impurity steel scrap and chemical components C3.75wt%, Si0.525 wt%, Mn 0.45 wt%, P 0.080wt%, S 0.030wt%, the rest is Fe and unavoidable impurities of pig iron into the converter, the conventional top-bottom composite blowing, adding lime, dolomite in conventional amounts , Magnesite ball slagging, the carbon content at the end point is controlled to 0.10wt%, and the tapping temperature is 1652°C; before tapping, lime and fluorite are added to the bottom of the ladle, and the amount of lime added is: 5.0kg / t 钢 , the amount of fluorite added: 0.4kg / t 钢 ; When tapping, adopt slag washing and full bottom argon blowing process, argon flow control 40NL / min, when the amount of molten steel in the ladle is greater than...

Embodiment 3

[0068] A. Molten steel smelting: the chemical composition C 4.0wt%, Si 0.35wt%, Mn 0.25wt%, P 0.080wt%, S 0.005wt%, the rest is Fe and unavoidable impurities of molten iron, chemical composition C0.25wt%, Si0.20wt%, Mn0.40wt%, P0.025wt%, S0.020wt%, the rest is Fe and inevitable impurity steel scrap and chemical composition C3.5wt%, Si0.40 wt% %, Mn 0.30 wt%, P 0.070wt%, S 0.020wt%, the rest is Fe and unavoidable impurities of pig iron into the converter, the conventional top-bottom compound blowing, adding lime, dolomite, Magnesite ball slagging, the carbon content at the end point is controlled to 0.13wt%, and the tapping temperature is 1648°C; lime and fluorite are added to the bottom of the ladle before tapping, and the amount of lime added is: 5.0kg / t 钢 , the amount of fluorite added: 0.4kg / t 钢 ; When tapping, adopt slag washing and full bottom argon blowing process, argon flow control is 50NL / min, when the amount of molten steel in the ladle is greater than 1 / 4, add the ...

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Abstract

The invention discloses a manufacture method of a 50CrVA alloy structural steel type hot rolled round steel bar. The manufacture method comprises the following steps of: smelting by a converter; refining through an LF furnace; performing continuous casting on a quadrate billet; heating a steel billet; rolling a bar; and cooling in heap, thus obtaining a 50CrVA alloy structural round steel bar ofat phi 60mm, wherein the 50CrVA alloy structural round steel bar ofat phi 60mm has stable quality and outstanding mechanical process performance. According to the manufacture method, the traditional mode of smelting by a large ultra-high-power electric furnace is replaced by the mode of smelting through the converter and refining through the LF furnace during steel-making, so that the manufacture method has the characteristics that the quality is stable, the production cost is low, and little electricity consumption is caused; the processes of smelting by the converter, refining through the LF furnace, fast rolling at a low temperature, and cooling in heap are innovated to produce the 50CrVA alloy structural round steel which has stable quality and outstanding comprehensive performance; the 50CrVA alloy structural round steel can particularly be used as the material for a through shaft and a half shaft of a cargo truck; and compared with the prior art, the manufacture method has the advantages that the production cost can be reduced by more than 50** Yuan per ton of materials, so that the economic benefit is remarkable.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for manufacturing a 50CrVA alloy structure hot-rolled round steel bar with low production cost, stable quality and excellent comprehensive performance. Background technique [0002] 50CrVA is both alloy structural steel and spring steel, with good mechanical properties and process properties, high hardenability; after heat treatment, it has good toughness, high ratio limit and strength limit, and high fatigue strength . It is widely used in high-load important springs, valve springs, piston springs, safety valve springs (ie wire rods) with working temperature <300°C, and through-shafts and half-shafts (ie bar materials) of special engineering trucks. [0003] The axles and half axles of engineering trucks are usually made of 45 steel and 40Cr bars, and the axles made of hot-rolled round steel bars with 50CrVA alloy structure are mainly used for high-en...

Claims

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Application Information

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IPC IPC(8): C21D8/06C21C5/35C22C38/24
Inventor 邓家木陈伟李金柱庾郁梅文玉兵彭燕来苏灿东
Owner WUKUN STEEL
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