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Low-yield-ratio and high strength thick plate and preparation process thereof

A technology with low yield ratio and preparation process, applied in manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of difficult control of laminar slow cooling method and poor steel production stability, and achieve easy control of production process and reduced production costs. , the effect of simple process

Active Publication Date: 2010-07-14
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tensile strength of the welded structural steel of this invention has reached above 780MPa, and the production process tends to be simple and feasible, but its laminar slow cooling method is difficult to control in the actual production process, and the stability of steel production is poor

Method used

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  • Low-yield-ratio and high strength thick plate and preparation process thereof
  • Low-yield-ratio and high strength thick plate and preparation process thereof
  • Low-yield-ratio and high strength thick plate and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 The low-yield ratio high-strength thick plate of this example adopts the following composition design: C 0.06%, Si 0.22%, Mn 1.70%, Al 0.041%, Nb 0.062%, Ti 0.015%, Ni 0.34%, Cu 0.37%, Cr 0.20%, the balance of iron and unavoidable impurities.

[0041] The production process of the low-yield-ratio high-strength thick plate is as follows:

[0042] According to the above composition design and preparation of smelting raw materials, after smelting and casting, a slab with a thickness of 80mm is formed;

[0043] The billet is heated to 1200°C, followed by two-stage rolling, the first-stage rolling temperature is 1114°C, rolling 4 passes, the thickness of the middle billet is 42mm, the second-stage rolling temperature is controlled at 926°C, and the final rolling temperature is 796 ℃, rolling 5 passes, plate thickness 20mm;

[0044] The above-mentioned rolled plate is controlled and cooled, the cooling rate after rolling is 10°C / s, the final cooling temperature is...

Embodiment 2

[0045] Example 2 The low-yield ratio high-strength thick plate of this example adopts the following composition design: C 0.08%, Si 0.25%, Mn 1.72%, Al 0.039%, Nb 0.058%, Ti 0.017%, Ni 0.32%, Cu 0.31%, Cr 0.25%, and the balance is iron and unavoidable impurities.

[0046] The production process of the low-yield-ratio high-strength thick plate is as follows:

[0047] According to the above composition design and preparation of smelting raw materials, after smelting and casting, a slab with a thickness of 80mm is formed;

[0048] The billet is heated to 1200°C, followed by two-stage rolling, the first-stage rolling temperature is 1136°C, rolling 4 passes, the thickness of the intermediate billet is 42mm, the second-stage rolling temperature is controlled at 923°C, and the final rolling temperature is controlled At 776°C, rolling 5 passes, plate thickness 20mm;

[0049] The above-mentioned rolled plate is controlled and cooled. After rolling, the cooling rate is 10°C / s, the fin...

Embodiment 3

[0050] Example 3 The low-yield ratio high-strength thick plate of this example adopts the following composition design: C 0.07%, Si 0.20%, Mn 1.69%, Al 0.043%, Nb 0.065%, Ti 0.015%, Ni 0.37%, Cu 0.35%, Cr 0.17%, and the balance is iron and unavoidable impurities.

[0051] The production process of the low-yield-ratio high-strength thick plate is as follows:

[0052] According to the above composition design and preparation of smelting raw materials, after smelting and casting, a slab with a thickness of 80mm is formed;

[0053] The billet is heated to 1200°C, followed by two-stage rolling, the first-stage rolling temperature is 1122°C, rolled for 4 passes, the thickness of the intermediate billet is 42mm, the second-stage rolling temperature is controlled at 917°C, and the final rolling temperature is controlled At 806°C, rolling 5 passes, plate thickness 20mm;

[0054] Controlled cooling of the above-mentioned rolled plate, the cooling rate after rolling is 15°C / s, the fina...

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Abstract

The invention provides a low-yield-ratio and high strength thick plate and a preparation process thereof. The thick plate comprises the following components in percentage by weight: 0.05-0.10 percent of C, 0.20-0.30 percent of Si, 1.60-1.80 percent of Mn, 0.05-0.07 percent of Nb, 0.30-0.40 percent of Ni, 0.30-0.40 percent of Cu, 0.15-0.30 percent of Cr, 0.20-0.40 percent of Mo, not more than 0.02 percent of Ti, not more than 0.045 percent of Al and the balance of iron and impurities. The preparation process adopts a rolling and cooling control process on the basis of the component design. The invention successfully solves the problems of contradiction and difficult accordancy of high strength and low yield ratio of a building thick plate, has simple process and wide application prospect, can effectively improve the yield and reduce the production cost and is suitable for industrialized large production and the fields of high-rise buildings, bridges, pipelines, and the like.

Description

technical field [0001] The invention specifically relates to a low-yield-ratio high-strength thick plate that can be used as steel for building structures and a preparation process thereof. Background technique [0002] Generally speaking, the use of high-strength steel in high-rise buildings can reduce the cross-section of the material, reduce the weight of steel and welding materials, thereby reducing the difficulties caused by steel construction, and at the same time reduce the weight of the entire steel structure and reduce costs. Therefore, structural steel has become a major development direction of construction steel due to its special applicability, high strength and excellent safety performance. In the past ten years, structural steel has accounted for about 10% of the entire steel production, and it is still increasing at a rate of 6% to 8% per year. [0003] Under severe load deformation, the consistency of plastic deformation of construction steel is the key. To...

Claims

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Application Information

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IPC IPC(8): C22C38/58C21D9/46C21D8/02
Inventor 辛星曲锦波方栋曲之国王炜赵文贵
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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