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

A 690mpa grade low carbon medium manganese high strength medium and heavy plate

A high-strength, thick plate technology, applied in the field of medium and thick plate manufacturing, can solve the problem of high alloy cost, achieve the effect of simple operation, excellent performance and saving production cost

Inactive Publication Date: 2019-12-06
NORTHEASTERN UNIV LIAONING
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-carbon medium-manganese steel in the case of relatively complex production processes such as high cost of 690MPa grade medium-thick plate alloys in the prior art, quenching + high-temperature tempering or off-line quenching and tempering. Thick plate DQ&P production process and its preparation method

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 690mpa grade low carbon medium manganese high strength medium and heavy plate
  • A 690mpa grade low carbon medium manganese high strength medium and heavy plate
  • A 690mpa grade low carbon medium manganese high strength medium and heavy plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A 690MPa grade low-carbon medium-manganese high-strength medium-thick steel plate with a thickness of 20mm, the chemical composition of which is: C: 0.09%, Mn: 4.97%, Si: 0.20%, S: 0.006%, P: 0.008% , Al: 0.022%, Cu: 0.15%, Ni: 0.26%, Mo: 0.16%, Cr: 0.40%, the balance is Fe and other inevitable impurities; the structure is lath martensite + film-like retained austenite body, the retained austenite volume fraction is 4.9%.

[0032] Its preparation method is as follows:

[0033] The continuous casting slab with a thickness of 230mm of the above components was heated to 1120°C with the furnace and held for 2 hours, and then rolled into a 20mm thick steel plate by one-stage rolling. The starting rolling temperature and finishing rolling temperature were 1050°C and 880°C respectively. ℃, a total of 11 rolling passes, the reduction rate of a single pass is controlled at 10%, and the total reduction rate is 91.30%.

[0034] After the final rolling, the steel plate is water-coo...

Embodiment 2

[0037] A 690MPa grade low-carbon medium-manganese high-strength medium-thick steel plate with a thickness of 80mm, the chemical composition of which is: C: 0.04%, Mn: 5.45%, Si: 0.20%, S: 0.0012%, P: 0.009% , Al: 0.023%, Cu: 0.12%, Ni: 0.21%, Mo: 0.20%, Cr: 0.39%, the balance is Fe and other inevitable impurities; the structure is lath martensite + film-like retained austenite body, the volume fraction of retained austenite is 6.8%.

[0038] Its preparation method is as follows:

[0039] The continuous casting slab with a thickness of 320mm of the above components was heated to 1150°C with the furnace and held for 3 hours, and then rolled into a steel plate with a thickness of 80mm after one-stage rolling. The starting and finishing temperatures were 1020°C and 910°C respectively. ℃, a total of 7 rolling passes, the single-pass reduction rate is controlled at 11%, and the total reduction rate is 75%.

[0040] After final rolling, the steel plate is water-cooled to 380°C at a...

Embodiment 3

[0043] A 690MPa-grade low-carbon medium-manganese high-strength medium-thick steel plate with a thickness of 50mm, the chemical composition of which is: C: 0.06%, Mn: 5.37%, Si: 0.19%, S: 0.009%, P: 0.004% , Al: 0.01%, Cu: 0.31%, Ni: 0.32%, Mo: 0.23%, Cr: 0.42%, the balance is Fe and other unavoidable impurities; the structure is lath martensite + film-like carbon-rich residue Austenite, the volume fraction of retained austenite is 5.45%.

[0044] Its preparation method is as follows: the continuous casting slab with the thickness of 230 mm of the above components is heated to 1200 ° C with the furnace and kept for 2 hours, and then it is rolled into a 50 mm thick steel plate by one-stage rolling. The starting rolling temperature and finishing rolling temperature are respectively 1080 ° C and 930 ° C, a total of 9 rolling passes, the total reduction rate of 78.26%.

[0045] After final rolling, the steel plate was water-cooled to 350 °C at a cooling rate of 20 °C / s, and then ...

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
thicknessaaaaaaaaaa
yield strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a 690 MPa-grade low-carbon medium-manganese high-strength medium-thickness plate and a quenching-dynamic blending production process preparation method. The 690 MPa-grade low-carbon medium-manganese high-strength medium-thickness plate comprises, by weight: 0.04-0.09 % of C, 4.9-5.45 % of Mn, 0.19-0.20 % of Si, 0.0012-0. 0006 % of S, 0.004-0.009 % of P, 0.01-0.023 % of Al,0.12-0.31 % of Cu, 0.21-0.32 % of Ni, 0.16-0.23 % of Mo, 0.39-0.42 % of Cr, the balance Fe and other inevitable impurities; and the thickness of a steel plate ranges from 20 mm to 80 mm, and the metallographic structure is lath martensite and thin-film-like carbon-rich residual austenite. The prepared low-carbon medium-manganese high-strength medium-thickness plate is excellent in performance, andthe yield strength is 780-820 MPa, the tensile strength ranges from 1000 MPa to 1150 MPa, the elongation percentage ranges from 15.78 % to 17.36 %, and the impact power at the temperature of 40 DEG Cis greater than or equal to 59 J.

Description

technical field [0001] The invention belongs to the field of plate manufacturing, and in particular relates to a 690MPa-level low-carbon, medium-manganese, high-strength medium-thick plate quenching-dynamic partitioning production process and a preparation method thereof. Background technique [0002] Medium and heavy plates with high strength, good low temperature impact toughness and weldability are widely used in construction machinery, bridges, construction and many other fields. Among them, medium and heavy plates with a yield strength of 690MPa and above are usually designed with low-carbon components, and a large amount of expensive alloying elements such as Ni, Mo, Cr, and Cu are added in combination to improve hardenability; in addition, in order to ensure that the thick steel plate The toughness of the core requires a multi-stage heat treatment process, which has a long production cycle and high energy consumption. Another solution is to adopt low carbon and mediu...

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): C22C38/58C22C38/02C22C38/06C22C38/42C22C38/44C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C21D2211/001C21D2211/008C22C38/02C22C38/06C22C38/42C22C38/44C22C38/58
Inventor 杜林秀齐祥羽胡军杜预董营翁镭吴红艳
Owner NORTHEASTERN UNIV LIAONING
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