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Production method of quenched and tempered high-intensity Q890D super-thick steel plate

A technology of extra-thick steel plate and production method, applied in the field of iron and steel smelting, can solve the problems of low qualified rate of ultrasonic flaw detection of steel plate, steel plate cannot be used as a structural part, etc., and achieves the effect of easy realization of process, simple process and reduction of production cost.

Active Publication Date: 2014-02-19
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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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 quenched and tempered high-intensity Q890D super-thick steel plate
  • Production method of quenched and tempered high-intensity Q890D super-thick steel plate
  • Production method of quenched and tempered high-intensity Q890D super-thick steel plate

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Embodiment 1

[0039] Example 1: Refining and tempering high-strength Q890D extra-thick steel plates with a plate thickness of 100 mm.

[0040] The composition mass percentage of steel is: C=0.14, Si=0.27, Mn=1.34, P=0.011, S=0.001, Als=0.038, Nb=0.018, V=0.050, Ti=0.022, Ni=0.22, Cr=0.38 , Mo=0.54, B=0.0018, the balance is Fe and unavoidable impurities; CEV=0.57.

[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 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 furnace is 1258°C.

[0043] (3) Rolling: The stage rolling temperature...

Embodiment 2

[0050] Example 2: Refining and tempering high-strength Q890D extra-thick steel plates with a plate thickness of 120 mm.

[0051] The chemical composition mass percentage of steel is:

[0052] C=0.14, Si=0.27, Mn=1.38, P=0.010, S=0.001, Als=0.040, Nb=0.015, V=0.048, Ti=0.018, Ni=0.25, Cr=0.40, Mo=0.52, B= 0.0017, the balance is Fe and unavoidable impurities; CEV=0.58.

[0053] The production process steps and parameters of steel are:

[0054] (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).

[0055] (2) Heating: The slab is heated at 1290-1300°C, the heating time is 13min / cm, the soaking time is 71min, the temperature of the upper surface is 18°C ​​higher than that of the lower surface, and the temperature of the core of the ...

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Abstract

A production method of a quenched and tempered high-intensity Q890D super-thick steel plate comprises processing steps as follows: liquid iron pretreatment, converter steelmaking, secondary refining, continuous casting including dynamic soft reduction and electromagnetic stirring, heating, rolling, pre-straightening, online quenching, offline quenching, tempering, finishing, performance examination and ultrasonic flaw detection. Steel comprises chemical composition in percentage as follows: not more than 0.16% of C, 0.20%-0.40% of Si, 1.30%-1.40% of Mn, not more than 0.015% of P, not more than 0.003% of S, 0.03%-0.05% of Als, not more than 0.10% of Nb+V+Ti, not more than 1.0% of Cu+Ni, 0.35%-0.45% of Cr, 0.45%-0.70% of Mo, not more than 0.0025% of B and the balance of Fe and unavoidable impurities. The produced high-performance quenched and tempered high-intensity Q890D super-thick steel plate with a thickness ranging from 100 mm to 120 mm can meet the manufacturing requirement of heavy machinery for 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 Q890D 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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IPC IPC(8): C22C38/54C22C33/04C21D8/02
Inventor 杨云清曹志强李玉路郑生斌刘吉文张青学杜江张勇伟高擎钱亚军姚建华汪后明徐优春王琦
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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