440MPa-tensile-strength hot-rolled high-strength steel sheet and production method thereof

A technology of tensile strength and production method, which is applied in the field of hot-rolled high-strength thin steel plates with a tensile strength of 440MPa, can solve problems such as increased costs, and achieve the effects of reduced production costs, thin thickness and high strength

Active Publication Date: 2014-04-02
武汉钢铁有限公司
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, the high-strength steel produced by the above-mentioned advanced steel mills at home and abroad by the CSP method has achieved certain technical effects, but in order to pursue the comprehensive performance of steel products

Method used

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  • 440MPa-tensile-strength hot-rolled high-strength steel sheet and production method thereof
  • 440MPa-tensile-strength hot-rolled high-strength steel sheet and production method thereof
  • 440MPa-tensile-strength hot-rolled high-strength steel sheet and production method thereof

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Embodiment Construction

[0032] In the following, the hot-rolled high-strength steel sheet with a tensile strength of 440 MPa and its production method will be further described in detail in combination with specific embodiments and accompanying drawings.

[0033] The percentages by weight of the chemical components of the hot-rolled high-strength thin steel sheets with a tensile strength of 440 MPa in each embodiment of the present invention (the balance is Fe and unavoidable impurities) are shown in Table 1:

[0034] Table 1 The chemical composition (wt%) of each embodiment of the present invention

[0035] Example

C

Si

mn

P

S

Nb

als

1

0.065

0.12

0.75

0.013

0.008

0.019

0.020

2

0.063

0.11

0.70

0.012

0.007

0.015

0.016

3

0.060

0.10

0.68

0.015

0.005

0.014

0.026

4

0.059

0.11

0.69

0.011

0.007

0.016

0.022

5

0.064

0.12 ...

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PUM

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Abstract

The invention discloses a 440MPa-tensile-strength hot-rolled high-strength steel sheet and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.05-0.08% of C, 0.10-0.30% of Si, 0.60-1.20% of Mn, at most 0.025% of P, at most 0.012% of S, 0.01-0.03% of Nb, 0.01-0.03% of Als, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: desulfurizing molten iron, smelting in a converter, and carrying out alloying treatment; carrying out ladle furnace treatment while feeding a silico-calcium wire; carrying out continuous casting and continuous rolling; discharging the casting blank, and carrying out high-pressure water dephosphorization; carrying out seven-pass rolling; carrying out laminar cooling; coiling; carrying out acid washing; flattening; and finishing. The steel has the advantages of stable performance, high dimensional accuracy and favorable elongation percentage, can be used for passenger vehicles chassis, various reinforcing plates and other automobile structural members and safety members, and lowers the automobile production cost; and the production method has the advantages of low production cost and favorable adaptability to industrial production.

Description

technical field [0001] The invention belongs to the technical field of steel for automobiles, and specifically refers to a hot-rolled high-strength thin steel plate with a tensile strength of 440 MPa and a production method. Background technique [0002] With the development of automobile lightweight technology, the thinning of high-strength steel for automobile structure and safety is the most direct way for automobile lightweight. At present, the thin-gauge steel plates commonly used in automobile production are mainly used in the production of parts such as automobile chassis systems, body structure systems, and seat safety systems. [0003] Compared with the traditional hot-rolling production line, the hot-rolled steel plate produced by the thin slab continuous casting and rolling (CSP) method has the characteristics of short process, high strength, low cost, especially thin thickness specification, and is an effective means for automobile lightweight . Taking advantag...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C33/04C21D8/00
Inventor 陈宇赵如意古兵平熊立波黄双刘祥东王立辉刘永前
Owner 武汉钢铁有限公司
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