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

Method for manufacturing low-yield-ratio steel

A technology with low yield ratio and manufacturing method, which is applied in the field of metallurgy, can solve the problems of high yield ratio and weak deformation resistance, and achieve the effects of low yield ratio, improved rolling rhythm, and broad development prospects

Inactive Publication Date: 2018-03-09
王刚
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, X80 grade pipeline steel is typical acicular ferrite or bainite. Most of these structures have high strength, but the yield ratio is generally high, so under special geological conditions, this The deformation resistance of high-grade pipeline steel is relatively weak

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Smelt and pour cast billets according to the set composition, heat the billets to 1150°C, and hold for 3 hours;

[0021] Casting rough rolling, the starting rolling temperature is 1150°C, and the total reduction is controlled at 62%; then finish rolling, the starting rolling temperature is 940°C, the final rolling temperature is 856°C, and the total reduction is controlled at 69%;

[0022] After rolling, cool to 600°C at a cooling rate of 150°C / s, and then cool to 420°C at a cooling rate of 10°C / s to obtain low-yield steel.

Embodiment 2

[0024] Smelting and pouring into billets according to the set composition, heating the billets to 1160°C, and holding for 2 hours;

[0025] Casting rough rolling, the starting rolling temperature is 1130°C, and the total reduction is controlled at 72%; then finish rolling, the starting rolling temperature is 930°C, the final rolling temperature is 830°C, and the total reduction is controlled at 70%;

[0026] After rolling, cool to 610°C at a cooling rate of 110°C / s, and then cool to 410°C at a cooling rate of 20°C / s to obtain low-yield steel.

Embodiment 3

[0028] Smelting and pouring into billets according to the set composition, heating the billets to 1170°C, and holding for 1 hour;

[0029] Casting rough rolling, the starting rolling temperature is 1100°C, the total reduction is controlled at 76%; then finish rolling, the starting rolling temperature is 920°C, the final rolling temperature is 800°C, and the total reduction is controlled at 72%;

[0030] After rolling, cool to 620°C at a cooling rate of 80°C / s, and then cool to 400°C at a cooling rate of 130°C / s to obtain low-yield steel.

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 ratioaaaaaaaaaa
Login to View More

Abstract

A manufacturing method of low yield ratio steel, which is carried out according to the following steps: (1) smelting according to the set composition, pouring into cast slabs, heating to 1150~1170°C, and keeping warm for 1~3h; (2) Roughly rolling the cast, The total reduction is 62~76%; then finish rolling, the total reduction is 68.4~72%; (3) Cool to 600~620°C at a cooling rate of 80~150°C / s, and then cool at a cooling rate of 10~30°C / s The cooling rate of s is cooled to 400~420°C. The product of the invention has high strength and low yield ratio, that is, excellent resistance to large deformation, shortens the waiting time of the slab, and improves the rolling rhythm.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for manufacturing low yield ratio steel. Background technique [0002] The development trend of oil and natural gas pipelines in the 21st century is mainly reflected in: high-purity steelmaking, high strength and toughness, good welding performance and excellent corrosion resistance; however, with the continuous depletion of energy, pipeline development One of the most challenging areas is seismic zones and permafrost, where large plastic deformations of buried line pipes can occur. The failure of the pipe is therefore no longer controlled by stress, but by strain. In recent years, a new concept of "strain-based design method" has been proposed abroad. In this way, line pipes need higher performance against compressive and tensile strains. [0003] At present, X80 grade pipeline steel is typical acicular ferrite or bainite. Most of these structures have high strengt...

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): C22C38/04C22C38/02C22C38/16C22C38/18C22C38/12C22C38/14C21D8/02
CPCC22C38/04C21D8/0226C21D2211/001C21D2211/002C21D2211/005C21D2211/008C22C38/02C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 王刚
Owner 王刚
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