Ultrahigh-strength steel plate steel plate with yield strength of 960MPa-level, and manufacturing method thereof

A yield strength and ultra-high strength technology, applied in the field of high-strength steel plate and its manufacturing, can solve the problems of high energy consumption, large amount of alloy addition, long quenching and tempering process, etc., and achieve the effect of good toughness and cold bending performance

Active Publication Date: 2013-08-07
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an ultra-high strength steel plate with a yield strength of 960MPa and its manufacturing method, which adopts low-carbon and multi-element and small alloy composition design, a

Method used

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  • Ultrahigh-strength steel plate steel plate with yield strength of 960MPa-level, and manufacturing method thereof
  • Ultrahigh-strength steel plate steel plate with yield strength of 960MPa-level, and manufacturing method thereof
  • Ultrahigh-strength steel plate steel plate with yield strength of 960MPa-level, and manufacturing method thereof

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Embodiment 1-3

[0031]The chemical composition of the 960MPa super-strength steel plate involved in the present invention is shown in Table 1. According to the chemical composition shown in Table 1, carry out converter smelting and refining outside the furnace and pour into continuous casting slabs. After the continuous casting slabs are heated, they are rolled in medium and thick plate rolling mills, and the steel plates are directly quenched after rolling. See Table 2 for main process parameters such as slab heating temperature, rough rolling finish temperature, finish rolling start temperature, and finish rolling finish temperature. Performance indicators such as steel plate strength, -40°C impact energy, and elongation are listed in Table 3.

[0032] Table 1 The chemical composition (wt.%) of the 960MPa grade ultra-high strength steel of Example 1-3 of the present invention

[0033] Example

C

Si

mn

P

S

Cr

Ni

Nb

Mo

V

Ti

B

Al

...

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Abstract

The invention relates to an ultrahigh-strength steel plate steel plate with yield strength of 960MPa-level, and a manufacturing method thereof. The steel plate comprises the chemical components of: 0.06-0.11% of C, 0.10-0.50% of Si, 1.20-1.60% of Mn, less than 0.015% of P, less than 0.005% of S, 0.20-0.50% of Cr, 0.10-0.30% of Ni, 0.10-0.30% of Mo, 0.02-0.05% of Nb, 0.02-0 .06% of V, 0.008-0.03% of Ti, 0.0005-0.003% of B, 0.02-0.05% of Al, and balance of Fe. According to the invention, through two-stage controlled rolling, and direct quenching and tempering, a refined tempered martensite or lower bainite structure is obtained. Defects such as long process, high energy consumption, large alloy addition amount, and the like of traditional quenching and tempering process are overcome. The obtained steel plate has good toughness and cold bending performance.

Description

technical field [0001] The invention relates to a high-strength steel plate and a manufacturing method thereof, in particular to an ultra-high-strength steel plate with a yield strength of 960MPa and a manufacturing method thereof. Background technique [0002] The ultra-high-strength steel plate with a yield strength of 960MPa has been widely used in structural parts of construction machinery, which has played an important role in improving equipment efficiency, reducing energy consumption and reducing self-weight, and adapts to the continuous development of construction machinery in the direction of high parameterization, large-scale and light weight requirements. At present, the mainstream production process of 960MPa grade steel plate is off-line quenching and tempering treatment, that is, off-line quenching and tempering after hot rolling. More carbon and other alloying elements need to be added, which not only increases the cost of alloying, but also is detrimental to...

Claims

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Application Information

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IPC IPC(8): C22C38/54C22C38/58C21D8/02
Inventor 车马俊崔强吴年春尹雨群雍岐龙孙新军李昭东邓伟李恒坤
Owner NANJING IRON & STEEL CO LTD
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