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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
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  • 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

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  • 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
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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 ...

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Abstract

The invention discloses a 690MPa level low-carbon, medium-manganese and high-strength medium-thick plate. The chemical composition in weight percentage is: C: 0.04~0.09%, Mn: 4.97~5.45%, Si: 0.19~0.20%, S: 0.0012~0.006 %, P: 0.004~0.009%, Al: 0.01~0.023%, Cu: 0.12~0.31%, Ni: 0.21~0.32%, Mo: 0.16~0.23%, Cr: 0.39~0.42%, the balance is Fe and others Unavoidable impurities; the thickness of the steel plate is 20-80mm, and the metallographic structure is lath martensite + film-like carbon-rich retained austenite; the low-carbon, medium-manganese, high-strength medium-thick plate prepared by the present invention has excellent performance : The yield strength is 780~820MPa, the tensile strength is 1000~1150MPa, the elongation is 15.78~17.36%, and the impact energy at ‑40℃ is ≥59J.

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

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Application Information

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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
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