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Production method of tempered high-strength Q550E super-thick steel plate

A technology of Q550E and extra-thick steel plates, which is applied in the field of iron and steel smelting, can solve the problems of low pass rate of steel plate ultrasonic flaw detection and the inability of steel plates to be used as structural parts, and achieve the effect of easy process, simple process and reduced production cost

Active Publication Date: 2014-01-29
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • 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 tempered high-strength Q550E super-thick steel plate
  • Production method of tempered high-strength Q550E super-thick steel plate
  • Production method of tempered high-strength Q550E super-thick steel plate

Examples

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Effect test

Embodiment 1

[0038] Example 1: Quenched and tempered high-strength Q550E extra-thick steel plate with a plate thickness of 100 mm.

[0039] The chemical composition mass percentage of steel is: C=0.14, Si=0.33, Mn=1.46, P=0.012, S=0.001, Als=0.044, Nb=0.014, Ti=0.016, Ni=0.64, Cr=0.38, Mo= 0.32, B=0.0018, the balance is Fe and unavoidable impurities; CEV=0.57.

[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 12min / cm, the soaking time is 68min, the temperature of the upper surface is 19°C higher than that of the lower surface, and the temperature of the core of the slab out of the furnace...

Embodiment 2

[0050] Example 2: Quenching and tempering high-strength Q550E extra-thick steel plates with a plate thickness of 120 mm were refined.

[0051] The chemical composition mass percentage of steel is: C=0.15, Si=0.33, Mn=1.45, P=0.013, S=0.002, Als=0.047, Nb=0.016, Ti=0.015, Ni=0.65, Cr=0.40, Mo= 0.35, B=0.0017, the balance is Fe and unavoidable impurities; CEV=0.58.

[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 11min / cm, the soaking time is 68min, the temperature of the upper surface is 16°C higher than that of the lower surface, and the temperature of the core of the slab ou...

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Abstract

The invention provides a production method of a tempered high-strength Q550E super-thick steel plate. The production method comprises the processing steps of molten steel pre-treatment, converter steelmaking, external refining, continuous casting (dynamic soft reduction and electromagnetic stirring), heating, rolling, pre-straightening, online quenching, off-line quenching, tempering, finishing, performance examination and ultrasonic flaw detection, and is characterized in that steel comprises the following chemical components: not more than 0.16% of C, 0.20-0.40% of Si, 1.45-1.60% of Mn, not more than 0.015% of P, not more than 0.003% of S, 0.03-0.06% of Als, not more than 0.05 of Nb and Ti, not more than 1.0% of Ni, 0.30-0.50% of Cr, 0.30-0.50% of Mo, not more than 0.0025% of B and the balance of Fe and inevitable impurities; CEV (carbon equivalent) is controlled to be not more than 0.60 and is computed according to the formula C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15. The produced high-performance 100-120mm tempered high-strength Q550E super-thick steel plate meets the requirements for manufacturing heavy machinery for mines, ports 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 Q550E 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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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/54C21D8/02C21D1/18
Inventor 杨云清成沛祥张青学蒋凌枫闻囯院史志凌杜江李玉路高擎钱亚军刘理张勇伟杨艳汪贺模王维胡振华
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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