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Manufacturing method of cold forming high intensity steel for welded structure

A welding structure and production method technology, applied in the field of micro-alloyed steel manufacturing, can solve the problems of lack of atmospheric corrosion resistance, large performance fluctuations, insufficient lateral toughness, etc., and achieve excellent comprehensive mechanical properties, improve lateral toughness, and improve The effect of corrosion resistance and fatigue resistance

Inactive Publication Date: 2005-01-12
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of the above method are as follows: firstly, the actual implementation of industrial production is difficult, which will lead to large fluctuations in performance; secondly, normalizing + tempering or quenching and tempering treatment is required, and the production cost is relatively high; thirdly, the transverse toughness is insufficient and does not have Atmospheric corrosion resistance
Therefore, the steel plate produced by the above method cannot have high strength, high toughness, strong atmospheric corrosion resistance, fatigue resistance and excellent cold forming performance at the same time, and cannot meet the requirements for the bogie material after the railway speed is increased.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: adopt the method of the present invention to produce cold-formed high-strength welded structural steel medium and heavy plates, carry out top-bottom composite blowing on an 80-ton converter in a steelmaking plant, and adopt molten iron desulfurization technology to make the S content in molten iron ≤0.005%, and the molten steel After blowing argon, and then vacuum treatment, the chemical composition of the steel contains C: 0.09, Si: 0.24, Mn: 1.22, P: 0.012, S: 0.007, Nb: 0.055, V: 0.039, Mo : 0.15, Ni: 0.15, Ti: 0.007, Cu: 0.10, the balance is Fe and unavoidable inclusions; the molten steel is fed with 160 grams of rare earth wire per ton of steel in the crystallizer, and poured into a slab with a cross-section of 210×1050mm Then the slab is sent to the medium plate factory for rolling, the slab heating rate is 11min / cm, and the soaking temperature is 1240°C; rolling is carried out on a 2800mm rolling mill, the rolling start temperature is 1080°C, and two...

Embodiment 2

[0033] Example 2: Adopt the method of the present invention to produce cold-formed high-strength welded structural steel hot-rolled plates, carry out top-bottom combined blowing on a 250-ton converter in a steelmaking plant, and adopt molten iron desulfurization technology to make the S content in molten iron ≤ 0.005% After the molten steel is blown with Ar, it is then subjected to RH vacuum treatment, so that the chemical composition of the steel contains C: 0.04, Si: 0.10, Mn: 1.60, P: 0.014, S: 0.001, Nb: 0.025, V: 0.008 by weight percentage , Mo: 0.25, Ni: 0.50, Ti: 0.015, Cu: 0.40, and the balance is Fe and unavoidable inclusions. Then carry out the silicon-calcium treatment process in the ladle furnace. Before starting, blow argon for 2 minutes to circulate the molten steel, and then feed the silicon-calcium cored wire. The feeding position is at 1 / 2 of the radius of the steel drum. The feeding depth is 1.2m, the feeding amount is 700 grams per ton of steel feeding wire,...

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Abstract

This invention relates to a production method for cold forming high intensity welded construction steel taking low carben-Mn as the basis, added by Nb, Ti microalloy as the main composition and applying melted iron desulfurization technology, converter top and bottom combined blowing and vacuum process, among which, the melted steel is casted to slab after rare earth or Ca to be casted to slab process then to be rolled to cut deal or hot rolled plate by cut deal production technology or the hot tandem rolling technology.

Description

Technical field [0001] The invention relates to a production method of cold-formed high-strength welded structural steel, specifically to produce a high-strength welded structure with a tensile strength of 590 MPa, excellent atmospheric corrosion resistance, fatigue resistance and easy forming A steel method belongs to the field of microalloyed steel manufacturing. Background technique [0002] High-speed is an important symbol of the development of railway technology today. One of the important factors why it is difficult to increase the speed of railway freight cars is that it is restricted by the bogie, and a good bogie must be made of high-quality materials. In recent years, the railway department has been continuously developing the bogies of freight cars to improve the comprehensive performance of the bogies and meet the speed-up requirements of freight trains. The bogies of railway freight cars with a speed of more than 140 kilometers per hour are required to have hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/00C21C7/00C22C33/04C22C38/16
Inventor 郑琳陆在学张云燕郭斌
Owner 武钢集团有限公司
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