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Production method of tempered high-strength Q620D super-thick steel plate

A technology of Q620D and extra-thick steel plates, 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, so as to achieve the effect of easy process, simple process and reduced production cost

Active Publication Date: 2015-06-10
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • 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 Q620D super-thick steel plate
  • Production method of tempered high-strength Q620D super-thick steel plate
  • Production method of tempered high-strength Q620D super-thick steel plate

Examples

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Effect test

Embodiment 1

[0039] Example 1: Quenching and tempering high-strength Q620D extra-thick steel plate with a plate thickness of 100 mm.

[0040] The mass percentage of chemical composition of steel is: C=0.13, Si=0.33, Mn=1.46, P=0.011, S=0.001, Als=0.045, Nb=0.030, Ti=0.014, Ni=0.45, Cr=0.38, Mo= 0.32, B=0.0016, the balance is Fe and unavoidable impurities; CEV=0.55.

[0041] The production process steps and parameters of steel are:

[0042] (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).

[0043] (2) Heating: The slab is heated at 1290-1300°C, the heating time is 11min / cm, the soaking time is 64min, the temperature of the upper surface is 15°C higher than that of the lower surface, and the temperature of the core of the slab out of the fu...

Embodiment 2

[0051] Example 2: Quenched and tempered high-strength Q620D extra-thick steel plate with a plate thickness of 120 mm.

[0052] The chemical composition mass percentage of steel is:

[0053] C=0.13, Si=0.28, Mn=1.48, P=0.011, S=0.001, Als=0.038, Nb=0.015, Ti=0.017, Ni=0.48, Cr=0.36, Mo=0.36, B=0.0016, balance It is Fe and unavoidable impurities; CEV=0.55.

[0054] The production process steps and parameters of steel are:

[0055] (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).

[0056] (2) Heating: The slab is heated at 1290-1300°C, the heating time is 13min / cm, the soaking time is 71min, the upper surface temperature is 18°C ​​higher than the lower surface, and the core temperature of the slab is 1261°C.

[0057] (3) Rolli...

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Abstract

The invention provides a production method of a tempered high-strength Q620D 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, 1.40-1.60% 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 0.06 of Nb and Ti, not more than 1.0% of Cu and Ni, 0.30-0.60% 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 Q620D 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 Q620D extra-thick steel plate. Background technique [0002] Extra-thick steel plates refer to steel plates with a thickness ≥ 60 mm. 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 tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C22C38/58C21D8/02
Inventor 杨云清唐卫红高擎罗登陈卫金杜江李玉路张青学张勇伟田勇易超艾亮白冰赵军贺劲松
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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