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

Low carbon 420 MPa grade composite fortified ultr-fine crystal grain band steel

An ultra-fine grain, 450mpa technology, applied in the field of low-carbon high-strength steel, can solve problems such as poor formability, low tensile strength, and large gaps, and achieve the effects of promoting replacement, saving alloy elements, and reducing steel costs

Inactive Publication Date: 2004-10-20
NORTHEASTERN UNIV
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is from the mechanical properties of the above steel or from the metallographic structure of the steel, it can be explained that the tensile strength of super-SS400 obtained in the experiment is still low, and the yield strength is relatively large, which makes the formability in the application poor; The gap in performance data is large, indicating that this technical scheme can improve the process conditions of the existing carbon-manganese steel with a yield strength of 200MPa to 400MPa structural steel, which still needs to be further studied and solved.

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 carbon 420 MPa grade composite fortified ultr-fine crystal grain band steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] According to the chemical composition range set by the ultra-fine-grained strip steel of the present invention, two groups are selected, numbered as A and B, which are respectively smelted on a 200-ton converter, and continuously cast into a continuous casting slab of 250mm × 1300mm × 10020mm. rolling on a rolling mill. The selected chemical components are listed in Table 1, the TMCP process conditions are listed in Table 2, the corresponding mechanical properties are listed in Table 3, and the metallographic structure test results are listed in Table 4. The metallographic structure is shown in Figure 1.

[0018] The chemical composition (weight, %) of table 1 embodiment ultra-fine grain strip steel

[0019] No. C Si Mn P S Fe

[0020] A 0.13 0.20 0.85 0.009 0.01 Margin

[0021] B 0.10 0.19 1.09 0.007 0.009 Margin

[0022] Table 2 TMCP process system

[0023] Sample Rough rolling start Rough rolling finish Finish finish start Finish ...

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

A 420 MPa-class low-carbon band steel with superfine crystal grains contains C (0.10-0.14 wt.%), Si (0.18-0.40), Mn (0.85-1.10), P (0-0.01), S (0-0.01) and Fe (rest), and is prepared through smelting, conticasting, heating, rolling twice, cooling and winding. Its advantages are multi-phase structure including ferrite, bainite and pearlite, high yield strength (420-450 MPa), high tension strength (530-550 MPa) and low cost. It can replace high-strength low-alloy steel.

Description

Technical field [0001] The invention relates to a low-carbon high-strength steel, in particular to a low-carbon 420MPa grade composite strengthened ultra-fine-grain strip steel formed by controlled rolling and controlled cooling of low-carbon structural steel. Background technique [0002] At present, iron and steel materials are still the main body of structural materials. However, with the development of society and economy, the steel industry is under increasing pressure to save resources, save energy, and protect the environment. Therefore, it has become a hot spot in the field of iron and steel research to use special processing techniques for traditional iron and steel materials to greatly improve their performance, prolong their service life, and effectively improve resource utilization and recovery. [0003] In 1997 and 1998, Japan and South Korea successively launched a research program on structural materials for the 21st century. The goal is to double the practic...

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): C21D8/02C22C38/04
Inventor 王国栋刘相华杜林秀王昭东吴迪丁桦
Owner NORTHEASTERN UNIV
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