Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Production method of quenched and tempered high-strength Q550F super-thick steel plate

An extra-thick steel plate and production method technology, applied in the field of iron and steel smelting, can solve the problems of low pass rate of steel plate ultrasonic flaw detection, steel plate cannot be used as structural parts, etc., and achieve the effect of easy process, simple process and reduced production cost

Active Publication Date: 2014-02-05
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
View PDF8 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production method of quenched and tempered high-strength Q550F super-thick steel plate
  • Production method of quenched and tempered high-strength Q550F super-thick steel plate
  • Production method of quenched and tempered high-strength Q550F super-thick steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Quenching and tempering high-strength Q550F extra-thick steel plate with a plate thickness of 100 mm was refined.

[0040] The chemical composition of steel is: C=0.14, Si=0.27, Mn=1.46, P=0.012, S=0.001, Als=0.038, Nb=0.017, Ti=0.018, Ni=0.62, Cr=0.36, Mo=0.33, B=0.0018, the balance is Fe and unavoidable impurities; CEV=0.57.

[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 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 is...

Embodiment 2

[0051] Example 2: Quenching and tempering high-strength Q550F extra-thick steel plate with a plate thickness of 120 mm.

[0052] The mass percentage of chemical composition of steel is: C=0.15, Si=0.28, Mn=1.45, P=0.013, S=0.002, Als=0.042, Nb=0.015, Ti=0.017, Ni=0.66, Cr=0.38, Mo= 0.34, 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 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 out of the fu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Yield strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a production method of a quenched and tempered high-strength Q550F 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 0.16% 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+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. The CEV (carbon equivalent) is controlled to be not more than 0.60, 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 Q550F 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 Q550F 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C21D8/02C22C38/54B22D11/18
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com