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Ultrahigh-strength steel plate and production method thereof

An ultra-high-strength, steel plate technology, applied in the field of high-strength steel plate and its manufacturing, can solve the problems of complex production process and complex manufacturing process, and achieve the effect of reasonable process design, loose process system and reduced manufacturing cost

Active Publication Date: 2012-08-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of the basic steel is simple, the content of alloy elements is low, but the production process is relatively complicated, requiring annealing, quenching and tempering, and the manufacturing process is complicated

Method used

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  • Ultrahigh-strength steel plate and production method thereof
  • Ultrahigh-strength steel plate and production method thereof
  • Ultrahigh-strength steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The chemical element percentage distribution ratio of the steel of the present invention is Example 1 in Table 1.

[0043] The manufacturing method is as follows: the heating temperature is 1180°C, and the heat preservation is 120 minutes; the starting rolling temperature of the first stage rolling is 1060°C; the final rolling temperature of the second stage rolling is 870°C, and the thickness of the finished steel plate is 4mm; the cooling termination temperature of the steel plate is below 200°C.

Embodiment 2

[0045] The chemical element percentage distribution ratio of the steel of the present invention is that of Example 2 in Table 1.

[0046] The manufacturing method is as follows: the heating temperature is 1200°C, and the heat preservation is 160 minutes; the rolling start temperature of the first stage rolling is 1090°C; the final rolling temperature of the second stage rolling is 900°C, and the thickness of the finished steel plate is 10mm; the cooling termination temperature of the steel plate is below 200°C.

Embodiment 3

[0048] The chemical element percentage distribution ratio of the steel of the present invention is Example 3 in Table 1.

[0049] The manufacturing method is as follows: the heating temperature is 1250°C, and the heat preservation is 150 minutes; the starting temperature of the first stage rolling is 1150°C; the final rolling temperature of the second stage rolling is 880°C, and the thickness of the finished steel plate is 6mm; the cooling termination temperature of the steel plate is below 200°C.

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Abstract

The invention relates to an ultrahigh-strength steel plate, which comprises, by weight percentage, 0.25-0.35% of C, 0.20-0.60% of Si, 0.8-2.0% of Mn, no more than 0.010% of P, no more than 0.005% of S, 0.02-0.06% of Al, 0.30-1.00% of Cr, 0.20-0.60% of Mo, 0.01-0.05% of Ti, 0.001-0.005% of B, no more than 1.0% of Ni, and the balance of Fe and unavoidable impurities. A production method of the ultrahigh-strength steel plate includes: smelting the components, obtaining a blank or ingot by casting; heating the bank or ingot to 1180-1250 DEG C prior to rolling, rolling in the first stage in a recrystallization area, performing multi-pass high reduction rolling with accumulative deformation not less than 80%; rolling in the second stage in a non-recrystallization area, finish rolling temperature being controlled at 870 to 930 DEG C); accelerating to cool the rolled steel plate to below 200 DEG C; and tempering at 200+ / -20 DEG C to obtain the steel plate 4-15mm thick. The yield strength of the steel plate is not less than 1400MPa, the tensile strength of the steel plate is not less than 1800MPa, and Charpy impact power Akv at -20 DEG C is not less than 20J.

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 tensile strength not less than 1800MPa. Background technique [0002] Mining machinery vehicles are the main means of transportation for the construction of large open-pit mines and large water conservancy projects. Under the conditions of high wear, high impact, and the requirement of lightweight body, the demand for ultra-high-strength steel plates is increasing. [0003] CN101376945A relates to a 2000MPa-level ultra-high-strength high-toughness steel plate and a manufacturing method thereof. Its composition design is characterized by high C, high Si and high Mn. Through controlled rolling and controlled cooling process, a kind of bainite + martensite composite phase steel is designed. The alloying elements are simple, but the content is high, and it is more difficult to produce and use [0004] CN1017...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/54C22C38/38C22C38/32C21D8/02C21D1/18
Inventor 赵小婷姚连登
Owner BAOSHAN IRON & STEEL CO LTD
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