Resource-saving Q345 low-alloy series steel plate and production method thereof

A technology of resource saving and production method, applied in the direction of heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of product performance impact, the gain outweighs the loss, etc., to achieve the effect of improving welding performance, keeping mechanical properties unchanged, and reducing production costs

Inactive Publication Date: 2013-04-17
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-cost production process mainly refers to reducing the alloy content or improving various main technical and economic indicators. The former is the most direct and effective method, but this method requires a new rolling and cooling process, otherwise the product performance will be affected and will be The loss outweighs the gain

Method used

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  • Resource-saving Q345 low-alloy series steel plate and production method thereof
  • Resource-saving Q345 low-alloy series steel plate and production method thereof
  • Resource-saving Q345 low-alloy series steel plate and production method thereof

Examples

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Effect test

Embodiment 1

[0049] A kind of production method of resource-saving Q345C low-alloy 25nm steel plate

[0050] The steel grade Q345C adopts continuous casting slabs of 150×3000×8700mm, and the composition system is resource-saving, which reduces the Mn content. The specific mass percentage composition of each element is: C: 0.17, Si: 0.29, Mn: 1.13 , P: 0.009, S: 0.005, Alt: 0.031, the balance is Fe and unavoidable impurities.

[0051] The target thickness of the steel plate is 25 mm, and the flat rolling mode is used to roll on the steckel rolling mill. The rolling pass is 11 passes, and the two-stage control rolling process is adopted, that is, after rolling 5 passes, the intermediate billet is kept warm, and the thickness to be warmed is 66mm. The temperature control parameters at each stage of the rolling process are as follows: the slab exit temperature is 1200°C; the rolling temperature in the fully recrystallized zone is 1090°C-970°C; the rolling start temperature in the non-recrysta...

Embodiment 2

[0058] A production method of resource-saving Q345E low-alloy 16mm steel plate

[0059] The steel grade Q345C adopts continuous casting slabs of 150×2605×8525mm. The composition system is resource-saving and reduces the Mn content. The specific mass percentage composition of each element is: C: 0.17, Si: 0.28, Mn: 1.21 , P: 0.016, S: 0.008, Alt: 0.029, the balance is Fe and unavoidable impurities.

[0060] The target thickness of the steel plate is 16mm, and it is rolled on the steckel rolling mill in the flat rolling mode. 40mm. The temperature control parameters at each stage of the rolling process are as follows: the slab exit temperature is 1220°C; the rolling temperature in the fully recrystallized zone is 1065°C-1005°C; the rolling start temperature in the non-recrystallized zone is 926°C; the final rolling temperature is 805°C ℃; after rolling, the steel plate adopts the controlled cooling process, and the upper and lower headers of the laminar flow device are respect...

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Abstract

The invention discloses a resource-saving Q345 low-alloy series steel plate and a production method thereof. The steel plate comprises the following chemical components in percent by weight: 0.15 to 0.18 percent of C, 0.15 to 0.50 percent of Si, 1.10 to 1.25 percent of Mn, not more than 0.030 percent of P, not more than 0.035 percent of S, 0 to 0.045 percent of Alt, not more than 0.44 percent of carbon equivalent, and the balance of Fe and inevitable impurities. The production process of the steel plate comprises 150 t converter, LF external refining, slab continuous casting, slab heating, steckel mill controlled rolling, controlled cooling, thermal straightening, cooling, shearing and mark warehousing. The resource-saving Q345 low-alloy series steel plate, produced by the production method, has the yield strength of 360 to 420 MPa, the tensile strength of 500 to 550 MPa, and the elongation of 24 to 32%, and acicular ferrite with the thickness of 3 to 6 mm, polygonal ferrite, degenerate perlite and a small amount of granular bainite are arranged on the surface layer of the steel plate.

Description

Technical field [0001] The present invention design 16 ~ 35 × 1600 ~ 3250 × 6000 ~ 18000mm High -strength low alloy steel production technology, specifically a resource -saving Q345 low alloy series steel plate and its production method. Background technique [0002] Q345A / B / C / D / E steel (hereinafter referred to as Q345 low alloy series steel) is a high -strength, high -delay tough structural steel. It has good comprehensive mechanical properties, low temperature impact toughness and welding performance. , Oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other dynamic load carrying structures, mechanical parts, building structures, general metal structures, etc., are widely used in my country and are generally used in hot rolling or positive fire.Toughness is reduced.The combination of thermal treatment is organically combined to reduce the process and save energy. [0003] Nowadays, the overall production capacity of steel and the complex and changeable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02C21D11/00
Inventor 李子林徐筱芗于爱民黄重陈尹泽刘海强邓杭州王峰崔全新
Owner ANYANG IRON & STEEL
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