Steel plate with shear strength above 1150 MPa and production method thereof

A technology of yield strength and production method, which is applied in the field of high-strength steel plate and its production, can solve the problems of extremely high hardness uniformity, difficulty in matching strength and toughness, difficulty in guaranteeing low-temperature impact performance of steel plate, etc., and achieve excellent comprehensive mechanical properties, low The effect of carbon equivalent chemical composition design and uniform fine structure

Inactive Publication Date: 2016-05-04
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the current technical conditions, it is extremely difficult to match the strength and toughness of this type of steel plate, and the requirements for hardness uniformity are extremely high, especially the low-temperature impact performance of the steel plate is difficult to guarantee

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: The specific production method of the quenched and tempered high-strength steel sheet with the yield strength of 1150 MPa or higher is as follows.

[0026] The thickness of this quenched and tempered high-strength steel plate is 40mm, and it is composed of the following components by weight percentage: C0.22%, Si0.35%, Mn1.23%, P0.010%, S0.002%, Cr0.63% , Mo0.38%, Ni0.38%, V0.045%, Nb0.020%, Ti0.028%, Al0.045%, B0.002%, the balance is Fe and unavoidable impurities.

[0027] The production method of this quenched and tempered high-strength steel plate includes smelting and continuous casting, heating and rolling, and heat treatment. The steps of each process are as follows:

[0028] (1) Smelting and continuous casting process: use electric arc furnace or converter method to smelt, and then send it into LF refining furnace for refining and vacuum treatment; after that, the billet is cast through continuous casting operation to obtain a continuous casting billet with a...

Embodiment 2

[0032] Example 2: The specific production method of the quenched and tempered high-strength steel sheet is as follows.

[0033] The thickness of this quenched and tempered high-strength steel plate is 50mm, and it is composed of the following components by weight percentage: C0.21%, Si0.32%, Mn1.41%, P0.012%, S0.004%, Cr0.74% , Mo0.50%, Ni0.46%, V0.043%, Nb0.025%, Ti0.024%, Al0.037%, B0.004%, the balance is Fe and inevitable impurities.

[0034] The production method of this quenched and tempered high-strength steel plate includes smelting and continuous casting, heating and rolling, and heat treatment. The steps of each process are as follows:

[0035] (1) Smelting and continuous casting process: use electric arc furnace or converter method to smelt, then send it into LF refining furnace for refining and vacuum treatment; after that, the billet is cast through continuous casting operation to obtain a continuous casting billet with a thickness of 300mm.

[0036] (2) Heating and rollin...

Embodiment 3

[0039] Example 3: The specific production method of the quenched and tempered high-strength steel sheet is as follows.

[0040] The thickness of this quenched and tempered high-strength steel plate is 30mm, and it is composed of the following components by weight percentage: C0.24%, Si0.20%, Mn1.33%, P0.008%, S0.005%, Cr0.58% , Mo0.30%, Ni0.41%, V0.060%, Nb0.027%, Ti0.030%, Al0.041%, B0.0016%, the balance is Fe and unavoidable impurities.

[0041] The production method of this quenched and tempered high-strength steel plate includes smelting and continuous casting, heating and rolling, and heat treatment. The steps of each process are as follows:

[0042] (1) Smelting and continuous casting process: use electric arc furnace or converter method to smelt, then send it into LF refining furnace for refining and vacuum treatment; after that, the billet is cast through continuous casting operation to obtain a continuous casting billet with a thickness of 300mm.

[0043] (2) Heating and roll...

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Abstract

The invention discloses a steel plate with shear strength above 1150 MPa and a production method thereof. The production method comprises a smelting and continuous casting procedure, a heating and rolling procedure and a heat treatment procedure; a continuously cast billet obtained in the smelting and continuous casting procedure comprises the following components in percentage by weight: 0.21%-0.26% of C, 0.20%-0.50% of Si, 1.15%-1.55% of Mn, 0-0.012% of P, 0-0.005% of S, 0.50%-0.80% of Cr, 0.30%-0.50% of Mo, 0.30%-0.50% of Ni, 0.040%-0.060% of V, 0.02%-0.03% of Nb, 0.020-0.030% of Ti, 0.020%-0.050% of Al, 0.0016%-0.004% of B, and Fe and inevitable impurities in balancing amount; and a two-stage rolling control technology is adopted in the heating and rolling procedure. Through the method, a low carbon equivalent chemical constituent design is realized, meanwhile the steel plate with a uniform and fine organization structure and excellent comprehensive mechanical properties is obtained, all mechanical property indexes of the produced steel plate meet requirements of technical specifications, and the production cost is remarkably reduced.

Description

Technical field [0001] The invention relates to a high-strength steel plate and a production method thereof, in particular to a quenched and tempered high-strength steel plate with a yield strength above 1150MPa and a production method thereof. Background technique [0002] With the development of large-scale and light-weight construction machinery, higher requirements are put forward for the strength of steel plates; in particular, the demand for quenched and tempered high-strength steel with a yield strength of 1150MPa or more is increasing. Currently, such steel plates mainly rely on imports. Under the existing technical conditions, it is extremely difficult to match the strength and toughness of such steel plates, and requires extremely high hardness uniformity, especially the low-temperature impact performance of the steel plates. How to solve the above-mentioned problems and produce quenched and tempered high-strength steel with excellent strength and toughness, good low-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/18C22C38/12C22C38/08C22C38/14C22C38/06C22C38/32C21D8/02
CPCC22C38/04C21D8/0226C21D8/0247C22C38/02C22C38/06C22C38/08C22C38/12C22C38/14C22C38/18C22C38/32
Inventor 陈起叶建军桑德广莫德敏张朋张亚丽郭恒斌
Owner WUYANG IRON & STEEL
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