Unlock instant, AI-driven research and patent intelligence for your innovation.

Low-yield-ratio high-toughness structural steel plate and manufacturing method thereof

A technology of structural steel plate and low yield ratio, which is applied in the field of metallurgy, can solve problems such as poor stability, achieve the effect of weakening the increase of yield strength and solving the effect of high yield ratio

Active Publication Date: 2022-07-12
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can solve the problem of low temperature toughness and yield ratio, but the stability is poor

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
  • Low-yield-ratio high-toughness structural steel plate and manufacturing method thereof
  • Low-yield-ratio high-toughness structural steel plate and manufacturing method thereof
  • Low-yield-ratio high-toughness structural steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0028] According to the chemical composition range and manufacturing method of the present invention, converter smelting-LF refining-RH vacuum degassing-slab continuous casting-continuous casting slab inspection and cleaning-slab heating-high pressure water descaling-controlled rolling-cooling-offline Process steps such as heat treatment to manufacture structural steel plates with low yield ratio and high toughness that can meet the service conditions of -60 °C.

[0029] The specific process of the above-mentioned heating, rolling and cooling stages is: the continuous casting slab is heated to 1140-1180 ° C, the total heating time is 190min (Example 1) / 195min (Example 2), and the soaking section holding time is 32min ( Example 1) and 35min (Example 2), use high-pressure water for descaling after the continuous casting slab is released; then control rolling is performed, and the rolling temperature in the rough rolling stage is 1020-1080 ° C (Examples 1 and 2), and the last thre...

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
crystal sizeaaaaaaaaaa
tensile strengthaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a low-yield-ratio high-toughness structural steel plate and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.06 to 0.08 percent of C, 0.20 to 0.30 percent of Si, 1.60 to 1.80 percent of Mn, 0.02 to 0.04 percent of Al, 0.025 to 0.045 percent of Nb, 0.01 to 0.02 percent of Ti and the balance of Fe and inevitable impurities. The steel plate has a polygonal ferritic structure having an average grain size of 5-10 [mu] m. The tensile strength of the steel plate is not less than 600MPa, the yield ratio is not more than 0.70, and the low-temperature impact energy at-60 DEG C is not less than The steel plate is subjected to molten steel smelting, slab continuous casting, casting blank heating, two-stage controlled rolling, accelerated cooling and off-line heat treatment, and the structural steel plate with the ultrafine grain polygonal ferritic structure is obtained.

Description

technical field [0001] The present application belongs to the field of metallurgical technology, and relates to a method for manufacturing a low yield ratio and high toughness structural steel plate that can meet the service condition of -60°C. Background technique [0002] The high-cold zone puts forward strict requirements on the low temperature toughness of the material. Usually, the steel needs to meet the impact toughness of -40 °C and still keep the impact toughness above 100J. The impact toughness meets the performance requirements of more than 100J. In order to meet the technical requirements, the industry usually adopts the production process design of low carbon + microalloying + controlled rolling and controlled cooling, in order to solve the problem of impact toughness, but it brings new problems of high yield ratio and reduced safety and reliability. [0003] Patent Bulletin No. CN110592484B proposes a 460MPa grade low welding crack sensitivity refractory steel...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/06C22C38/04C22C33/04C21D9/46C21D8/02C21D1/00
CPCC22C38/12C22C38/04C22C38/14C22C38/06C22C33/04C21D8/0226C21D1/00C21D9/46Y02P10/20
Inventor 白云孙宪进罗元东苗丕峰许峰诸建阳张军
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD