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

A kind of cold-rolled high-strength plastic product medium manganese steel with lower Mn content and preparation method thereof

A technology of high-strength plastic accumulation and manganese steel accumulation, applied in the field of automobile steel

Active Publication Date: 2021-07-23
SHOUGANG CORPORATION
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current patents on medium manganese steel, everyone is generally concerned about how to obtain higher strength and plasticity by adjusting the alloy composition or heat treatment process. No one has investigated the effect of Mn content on the toughness of ferrite in medium manganese steel.

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
  • A kind of cold-rolled high-strength plastic product medium manganese steel with lower Mn content and preparation method thereof
  • A kind of cold-rolled high-strength plastic product medium manganese steel with lower Mn content and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The second aspect of the present invention provides a method for preparing the above-mentioned cold-rolled high-strength plastic-laminated medium-manganese steel with a lower Mn content, the steps comprising:

[0035] S1. Continuous casting of molten steel to produce slabs or mold castings to produce ingots. The chemical composition of molten steel includes: by weight percentage, C: 0.15-0.6%, Mn: 3.0-6.0%, Al: 1.0-3.0%, Si : 0-2.0%, Cr: 0-5.0%, Ni: 0-2.0%, the balance is Fe and unavoidable impurities;

[0036]S2. Hot rolling the billet or ingot obtained in step S1 after opening the billet. The hot rolling process includes: heating the billet to 1150-1250°C, soaking time for 1.5-2.5h, and hot rolling to a thickness through multiple passes It is a thin plate of 2-6mm, the final rolling temperature of the multi-pass hot rolling is not lower than 820°C, and the coiling is air-cooled to room temperature after rolling;

[0037] S3. Put the hot-rolled sheet or coiled sheet o...

Embodiment 1

[0042] This embodiment provides a cold-rolled high-strength ductile medium-manganese steel with a relatively low Mn content. The chemical composition is, by weight percentage, C: 0.45%, Mn: 5.0%, Al: 2.0%, Si: 0.3% , Cr: 0.7%, Ni: 0.4%, and the balance is Fe and unavoidable impurities.

[0043] The preparation method of the above-mentioned cold-rolled high-strength plastic product medium-manganese steel with lower Mn content, the steps include:

[0044] The steel billet is heated to 1200°C, soaking time is about 2 hours, hot rolled to a steel plate with a thickness of 4mm through multiple passes, the final rolling temperature is 820°C, and then coiled and air-cooled to room temperature.

[0045] The hot-rolled steel coils were put into a bell furnace for softening annealing, kept at 700°C for 20h, and then cooled to room temperature.

[0046] After pickling the hot-rolled annealed sheet, it is cold-rolled, and the cold-rolling reduction is 70%.

[0047] Put the cold-rolled s...

Embodiment 2

[0052] This embodiment provides a cold-rolled high-strength plastic-laminated medium-manganese steel with a relatively low Mn content. The chemical composition is, by weight percentage, C: 0.21%, Mn: 3.0%, Al: 1.2%, and Si: 1.5%. , Cr: 2.0%, Ni: 0.8%, V: 0.5%, B: 0.5%, and the balance is Fe and unavoidable impurities.

[0053] The preparation method of the above-mentioned cold-rolled high-strength plastic product medium-manganese steel with lower Mn content, the steps include:

[0054] The steel billet is heated to 1200°C, soaking time is about 2 hours, hot rolled to a steel plate with a thickness of 5mm through multiple passes, the final rolling temperature is 825°C, then coiled and air-cooled to room temperature.

[0055] The hot-rolled steel coils were put into a bell furnace for softening annealing, kept at 670°C for 24h, and then cooled to room temperature.

[0056] After pickling the hot-rolled annealed sheet, it is cold-rolled, and the cold-rolling reduction is 50%.

...

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
tensile strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a cold-rolled high-strength plastic product medium-manganese steel with low manganese content and a preparation method thereof. The weight percentages of the chemical components are: C: 0.15-0.6%, Mn: 3.0-6.0%, Al: 1.0 -3.0%, Si: 0.0-2.0%, Cr: 0-5.0%, Ni: 0-2.0%, and the balance is Fe and unavoidable impurities. The preparation of cold-rolled high-strength plastic-laminated medium-manganese steel includes the following steps: the molten steel is smelted in a converter and then continuously cast to obtain a continuous casting slab; the continuous casting slab is heated in a heating furnace and then hot rolled to obtain a hot-rolled coil; After softening and annealing in a bell furnace, cold rolling is performed to obtain a chilled steel strip, and the chilled steel strip is subjected to continuous annealing treatment to obtain a finished product of cold-rolled high-strength plastic medium-manganese steel. The invention enables the cold-rolled medium-manganese steel to have high strength-plastic product under the premise of ensuring good toughness, and has good practical application significance.

Description

technical field [0001] The invention belongs to the technical field of steel for automobiles, and in particular relates to a cold-rolled high-strength plastic-laminated medium-manganese steel with relatively low Mn content and a preparation method thereof. Background technique [0002] With the increasing requirements of the automobile industry for energy saving, emission reduction and collision safety, the medium manganese steel for automobiles with high strength and plasticity has increasingly become the focus of attention. Under the condition of quasi-static tension, the strength-plastic product of cold-rolled medium-manganese steel can reach up to about 80GPa·%. After annealing in the critical zone, the medium manganese steel is mainly composed of fine ferrite and metastable austenite, in which the ferrite has a very low C content, and its chemical composition is similar to that of Fe-Mn alloy. Fe-Mn alloys tend to be brittle, and the higher the concentration of Mn at t...

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 Patents(China)
IPC IPC(8): C22C38/58C22C38/38C22C38/34C22C38/18C22C38/08C22C38/06C22C38/04C22C38/02C21D8/02
CPCC21D8/0205C21D8/0247C21D2211/001C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/18C22C38/34C22C38/38C22C38/58
Inventor 阳锋韩赟姜英花刘华赛谢春乾邱木生潘丽梅白雪滕华湘陈斌曹杰章军朱国森
Owner SHOUGANG CORPORATION
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