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Export S355J2 titanium-added steel plate and production method thereof

A technology of S355J2 and production method, applied in the field of S355J2 titanium-added steel plate, can solve the problems of narrow B element range design, large impact performance fluctuation, poor low temperature toughness, etc., to improve safety performance, short production process, and production cost. low effect

Inactive Publication Date: 2014-04-30
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 2. The toughness of B-containing steel is poor, and the impact performance fluctuates greatly
[0008] B forms precipitation or network precipitation along the grain boundary of the steel, which reduces the toughness of the steel and forms "boron brittleness". Due to the existence of boron brittleness, its low-temperature toughness is even worse. , easily broken
[0009] 3. In order to avoid the performance deterioration of B-containing steel, the range of B element in B-added steel is designed to be extremely narrow, and the process window is small. If it is mass-produced, the efficiency of the smelting process will be reduced

Method used

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  • Export S355J2 titanium-added steel plate and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] The steel grade is S355J2, the thickness of the continuous casting slab is 280mm, and the thickness of the rolled product is 40mm.

[0027] The chemical composition wt% content is: C: 0.14%, Si: 0.30%, Mn: 1.1%, Ti: 0.055%, P: 0.01%, S: 0.003%, and the rest is iron and unavoidable trace impurities.

[0028] The production process is: continuous casting slab - heating - dephosphorization - controlled rolling - controlled cooling - hot straightening - stacking slow cooling - cutting - inspection - finished product.

[0029] A low-temperature heating system is adopted to reduce the heating temperature to avoid coarsening of grains caused by high-temperature burning of steel, and to keep the austenite grains before rolling fine. Two-stage controlled rolling is adopted to form as many ferrite transformation nuclei as possible and effectively refine ferrite grains. Through the repeated deformation of the recrystallization zone in the first stage, the austenite grains are ref...

Embodiment 2

[0034] The steel grade is S355J2, the thickness of the continuous casting slab is 240mm, and the thickness of the rolled product is 20mm.

[0035] The chemical composition wt% content is: C: 0.16%, Si: 0.25%, Mn: 1.4%, Ti: 0.059%, P: 0.016%, S: 0.002%, and the rest is iron and unavoidable trace impurities.

[0036] The production process is: continuous casting slab - heating - dephosphorization - controlled rolling - controlled cooling - hot straightening - stacking slow cooling - cutting - inspection - finished product.

[0037] A low-temperature heating system is adopted to reduce the heating temperature to avoid coarsening of grains caused by high-temperature burning of steel, and to keep the austenite grains before rolling fine. Two-stage controlled rolling is adopted to form as many ferrite transformation nuclei as possible and effectively refine ferrite grains. Through the repeated deformation of the recrystallization zone in the first stage, the austenite grains are re...

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Abstract

The invention provides an export S355J2 titanium-added steel plate and a production method thereof. The export S355J2 titanium-added steel plate contains the following chemical ingredients by wt%: not more than 0.16% of C, 0.25-0.45% of Si, 1.0-1.4% of Mn, not more than 0.02% of P, not more than 0.004% of S, 0.05-0.06% of Ti, not more than 0.40 of CEV, and the balance of ion and inevitable impurities. Total heating time of continuous casting billet heating is not less than 9min / cm, the highest heating temperature is 1220 DEG C, soaking temperature is not more than 1200 DEG C, and soaking zone in-furnace time is more than 90min; the first stage start rolling temperature is not more than 1140 DEG C, and total reduction rate is more than 60%; the second stage start rolling temperature is 950 DEG C, finial rolling temperature is less than 900 DEG C, and deformation rate is controlled to 50%-60%; stacking temperature is not less than 400 DEG C, and stacking time is not less than 16h. The production technology provided by the invention has short technological process, and is low in production cost, suitable for large-batch production and beneficial for increasing export volume; product ingredients and product performance of the steel plate completely meet the requirements of European standard EN10020, Reh of the steel plate is up to 386MPa, Rm of the steel plate is up to 522MPa, A value of the steel plate is 28%, and average impact value of the steel plate at -20 DEG C is up to 172J.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to an S355J2 titanium-added steel plate for export and a production method thereof. Background technique [0002] According to the definition of alloy steel in 3.2.1 of the European Standard EN10020—"Definition and Classification of Steel Grades", steel types with a B content exceeding 0.0008% are alloy steel, and the national policy stipulates that alloy steel can enjoy a 13% export tax rebate discount. In recent years, the production and operation of the iron and steel industry have fallen into continuous difficulties, and domestic manufacturers are doing their best to develop new profit growth points, and they have turned their attention to the development of B-containing steel. Adding B element to the steel grade can successfully achieve the purpose of export tax rebate. However, a series of impacts caused by the addition of B will bring certain q...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 刘源李新玲王若刚应传涛陈华杨军刘立强张坤罗志华
Owner ANGANG STEEL CO LTD
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