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Production method of hardened and tempered high-strength Q500E super-thick steel plate

A technology of extra-thick steel plates and production methods, which is applied in the field of iron and steel smelting, can solve the problems that steel plates cannot be used as structural parts, and the pass rate of ultrasonic flaw detection of steel plates is low, and achieve the effects of simple procedures, reduced production costs, and easy processes

Active Publication Date: 2014-02-05
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN201110093666.2 "Quenched and tempered high-strength steel plate for wood-based panel equipment and its production method" discloses a production method of actually NM400 steel plate with a thickness of 70-120mm. The fire temperature is 300-350°C, and this type of steel plate cannot be used as a structural part
[0013] e. The pass rate of steel plate ultrasonic flaw detection is low

Method used

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  • Production method of hardened and tempered high-strength Q500E super-thick steel plate
  • Production method of hardened and tempered high-strength Q500E super-thick steel plate
  • Production method of hardened and tempered high-strength Q500E super-thick steel plate

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Effect test

Embodiment 1

[0038] Example 1: Quenched and tempered high-strength Q500E extra-thick steel plate with a plate thickness of 100 mm was refined.

[0039] The mass percentage of chemical composition of steel is: C=0.13, Si=0.26, Mn=1.10, P=0.010, S=0.001, Al s =0.041, Nb=0.030, Ti=0.015, V=0.046, Ni=0.50, Cr=0.40, Mo=0.51, B=0.0018, the balance is Fe and unavoidable impurities; CEV=0.54.

[0040] The production process steps and parameters of steel are:

[0041] (1) Continuous casting: Produce 300X2280mm cross-section continuous casting slabs according to the clean steel production method, in which the superheat of the continuous casting tundish is less than 10°C, the light reduction is 4mm, and the electromagnetic stirring current is controlled by 300A (7Hz).

[0042] (2) Heating: The slab is heated at 1290-1300°C, the heating time is 11min / cm, the soaking time is 70min, the temperature of the upper surface is 16°C higher than that of the lower surface, and the temperature of the core of th...

Embodiment 2

[0050] Example 2: Quenching and tempering high-strength Q500E extra-thick steel plates with a plate thickness of 120 mm were refined.

[0051] The mass percentage of chemical composition of steel is: C=0.13, Si=0.24, Mn=1.10, P=0.011, S=0.001, Al s =0.043, Nb=0.030, Ti=0.017, V=0.045, Ni=0.49, Cr=0.41, Mo=0.52, B=0.0017, the balance is Fe and unavoidable impurities; CEV=0.56.

[0052] The production process steps and parameters of steel are:

[0053] (1) Continuous casting: Produce 300X2280mm cross-section continuous casting slabs according to the clean steel production method, in which the superheat of the continuous casting tundish is less than 10°C, the light reduction is 4mm, and the electromagnetic stirring current is controlled by 300A (7Hz).

[0054] (2) Heating: The slab is heated at 1290-1300°C, the heating time is 12min / cm, the soaking time is 65min, the temperature of the upper surface is 17°C higher than that of the lower surface, and the temperature of the core o...

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Abstract

The invention discloses a production process of a hardened and tempered high-strength Q500E super-thick steel plate. The production method comprises process steps of molten iron pre-treating, converter steelmaking, external refining, continuous casting (dynamic soft pressing and electromagnetic stirring), heating, rolling, pre-straightening, online quenching, offline quenching, tempering, finishing, performance examining and ultrasonic-wave flaw detecting. The steel comprises the chemical components in percentage by mass: not greater than 0.15% of C, 0.20%-0.40% of Si, 1.00%-1.30% of Mn, not greater than 0.015% of P, not greater than 0.003% of S, 0.03%-0.06% of AlT, not greater than 0.10% of Nb+Ti+V, not greater than 1.0% of Cu+Ni, 0.40%-0.70% of Cr, 0.30%-0.60% of Mo, not greater than 0.0025% of B, and the balance of Fe and inevitable impurities. CEV is controlled to be not greater than 0.58, and the CEV is calculated according to a formula of CEV=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15. The produced high-performance hardened and tempered high-strength Q500E super-thick steel plate which is 100mm-120mm thick satisfies needs of manufacturing heavy machinery of a mine, a port, and the like.

Description

technical field [0001] The invention belongs to iron and steel smelting technology, in particular to a production method of quenched and tempered high-strength Q500E extra-thick steel plate. Background technique [0002] Extra-thick steel plates refer to steel plates with a thickness ≥ 60mm. The methods for producing extra-thick steel plates in the prior art mainly include: die-casting steel ingot and electroslag remelting steel ingot method, continuous casting slab thick plate method, welding composite casting slab method, and vertical continuous casting method. [0003] Generally, the maximum thickness of continuous casting slabs in steel mills is 300mm, and very few steel mills also produce continuous casting slabs with a thickness of 400mm. With the development of wide and thick plate production technology, the technology of using 260-300mm slab to produce 60-100mm general strength level extra-heavy plate technology has become very popular; the thickness is greater than...

Claims

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Application Information

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IPC IPC(8): C22C38/54C22C38/46C22C38/48C22C38/50C22C38/44C22C38/32C22C38/22C22C38/24C22C38/26C22C38/28C21D8/02
Inventor 杨云清张爱兵翟运涛蒋德阳吴清明袁仁平张青学杜江李玉路高擎张勇伟朱胡军张计谋李仕一黄远涛胡振华
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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