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A production method of quenched and tempered high-strength q690f extra-thick steel plate

A technology of Q690F and extra-thick steel plates, which is applied in the field of iron and steel smelting, can solve the problems of low qualified 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: 2015-08-05
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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  • A production method of quenched and tempered high-strength q690f extra-thick steel plate
  • A production method of quenched and tempered high-strength q690f extra-thick steel plate
  • A production method of quenched and tempered high-strength q690f extra-thick steel plate

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Effect test

Embodiment 1

[0039] Example 1: Quenched and tempered high-strength Q690F 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=0.24, Mn=1.12, P=0.010, S=0.001, Als=0.040, Nb=0.026, V=0.046, Ti=0.015, Ni=0.62, Cr= 0.42, Mo=0.49, B=0.0018, 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...

Embodiment 2

[0051] Example 2: Quenching and tempering high-strength Q690F extra-thick steel plate with a plate thickness of 120 mm was refined.

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

[0053] C=0.13, Si=0.24, Mn=1.18, P=0.011, S=0.001, Als=0.040, Nb=0.026, V=0.042, Ti=0.016, Ni=0.61, Cr=0.44, Mo=0.48, B= 0.0017, the balance is Fe and unavoidable impurities; CEV=0.56.

[0054] The production process steps and parameters 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 temperature of the upper surface is 18°C ​​higher than that of the lower surface, and the temperature of the core of t...

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Abstract

The invention relates to a production method of a quenched and tempered high-strength Q690F super-thick steel plate. The process steps are as follows: pretreatment of molten iron, steel-making by a converter, secondary refining, continuous casting (dynamic soft reduction and electromagnetic stirring), heating, rolling, pre-straightening, online quenching, offline quenching, tempering, finishing, performance testing and ultrasonic flaw detection. Steel comprises the following chemical components in percentage by weight: not more than 0.14% of C, 0.20-0.40% of Si, 1.00-1.20% 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, 0.40-0.60% of Cr, 0.45-0.70% of Mo, not more than 0.0025% of B and the balance of Fe and inevitable impurities. The CEV (carbon equivalent) is controlled to be not more than 0.57, and the CEV is calculated according to the following formula: CEV=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15. The produced high-performance 100-120mm quenched and tempered high-strength Q690F super-thick steel plate can meet the needs for manufacturing heavy machinery in 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 Q690F 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 Patents(China)
IPC IPC(8): C22C38/54C22C38/46C22C38/48C22C38/50C22C38/44C22C38/32C22C38/22C22C38/24C22C38/26C22C38/28C21D8/02
Inventor 杨云清曹志强杜江汤伟唐治宇李杰李玉路张青学张勇伟高擎钱亚军华浩翟运涛阳小兵
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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