Ti microalloyed medium manganese steel plate for offshore platform and preparation method thereof

A micro-alloying and offshore platform technology, applied in the field of steel production in the metallurgical industry, can solve the problems of single strengthening mechanism, complex preparation process, uneven structure and properties, and achieve simple control and operation, inhibit abnormal growth, and enhance the uniformity of structure and properties. sexual effect

Active Publication Date: 2020-05-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current problems of uneven microstructure and properties in the thickness direction, complex preparation process, and single strengthening mechanism of extra-thick plates, the present invention provides a Ti micro-alloyed medium-manganese steel medium-thick plate for marine use and a preparation method thereof

Method used

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  • Ti microalloyed medium manganese steel plate for offshore platform and preparation method thereof
  • Ti microalloyed medium manganese steel plate for offshore platform and preparation method thereof
  • Ti microalloyed medium manganese steel plate for offshore platform and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A Ti microalloyed medium-manganese steel plate for offshore platforms, the chemical composition of which is: C: 0.10%, Mn: 4.0%, Ti: 0.02%, Si: 0.12%, S: 0.001%, P : 0.004%, Al: 0.02%, Cr: 0.40%, Ni: 0.11%, Mo: 0.10%, Cu: 0.12%, and the rest are Fe and other unavoidable impurities.

[0035] A preparation method for Ti microalloyed medium-manganese steel plate for offshore platform, comprising the following process steps:

[0036] Step 1, billet heating:

[0037] The ocean platform is forged with a Ti microalloyed medium-manganese steel plate alloy ingot to form a 140mm thick blank, heated to 1250 ° C with the furnace, and kept for 1 hour to obtain a heated blank. The chemical composition of the heated blank is: C: 0.10%, Mn: 4.0%, Ti: 0.02%, Si: 0.12%, S: 0.001%, P: 0.004%, Al: 0.02%, Cr: 0.40%, Ni: 0.11%, Mo: 0.10%, Cu: 0.12%, the rest is Fe and other unavoidable impurities.

[0038] Step 2: Hot Rolling Treatment:

[0039] (1) Hot-rolling the heated billet for 13 t...

Embodiment 2

[0045] A Ti microalloyed medium-manganese steel plate for offshore platforms, the chemical composition of which is: C: 0.06%, Mn: 6.0%, Ti: 0.05%, Si: 0.25%, S: 0.001%, P : 0.003%, Al: 0.024%, Cr: 0.10%, Ni: 0.20%, Mo: 0.25%, Cu: 0.20%, and the rest are Fe and other unavoidable impurities.

[0046] A preparation method for Ti microalloyed medium-manganese steel plate for offshore platform, comprising the following process steps:

[0047] Step 1, billet heating:

[0048] The offshore platform is forged with Ti microalloyed medium-manganese steel medium-thick plate alloy ingot to form a 140mm thick billet, heated to 1200°C with the furnace, and kept for 2 hours to obtain the heated bad material. The chemical composition according to the weight percentage is: C: 0.06%, Mn: 6.0%, Ti: 0.05%, Si: 0.25%, S: 0.001%, P: 0.003%, Al: 0.024%, Cr: 0.10%, Ni: 0.20%, Mo: 0.25%, Cu: 0.20%, the rest is Fe and other unavoidable impurities.

[0049] Step 2: Hot Rolling Treatment:

[0050] (1) ...

Embodiment 3

[0056] A Ti microalloyed medium-manganese steel plate for offshore platforms, the chemical composition of which is: C: 0.03%, Mn: 8.0%, Ti: 0.10%, Si: 0.39%, S: 0.002%, P : 0.003%, Al: 0.05%, Cr: 0.40%, Ni: 0.30%, Mo: 0.35%, Cu: 0.30%, and the rest are Fe and other unavoidable impurities.

[0057] A preparation method for Ti microalloyed medium-manganese steel plate for offshore platform, comprising the following process steps:

[0058] Step 1, billet heating:

[0059] The ocean platform is forged with a Ti microalloyed medium-manganese steel medium-thick plate alloy ingot to form a 140mm thick billet, heated to 1100°C with the furnace, and kept for 3 hours to obtain the heated billet. The chemical composition of the heated billet is: C: 0.03 %, Mn: 8.0%, Ti: 0.10%, Si: 0.39%, S: 0.002%, P: 0.003%, Al: 0.05%, Cr: 0.40%, Ni: 0.30%, Mo: 0.35%, Cu: 0.30 %, the rest is Fe and other unavoidable impurities.

[0060] Step 2: Hot Rolling Treatment:

[0061] (1) Hot rolling the hea...

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Abstract

The invention discloses a Ti microalloyed medium-manganese steel medium-thickness plate for an ocean platform and a preparation method thereof. The Ti microalloyed medium-manganese steel medium-thickness plate is characterized by comprising the following chemical components of, by weight, 0.03-0.1 % of C, 4.0- 8.0 % of Mn, 0.02-0.10 % of Ti, 0.10-0.40 % of Si, less than 0. 005 % of S, less than 0.005 % of P, 0.02-0.05 % of Al, 0.10-0.40 % of Cr, 0.10-0.30 % of Ni, 0.10-0.40 % of Mo, 0.10-0.30 % of Cu, the balance Fe and other inevitable impurities. The preparation method comprises the following steps that 1, according to the Ti microalloyed medium-manganese steel medium-thickness plate for the ocean platform, alloy ingot is forged into a blank, heat preservation is carried out along with the heating of a furnace, and the heated blank is obtained; 2, multi-pass hot rolling is carried out on the heated blank to obtain a hot rolled plate, and then quenching is carried out; and 3, the quenched medium-thickness plate is put into the furnace for heating and preserving heat, the quenched medium-thickness plate is subjected to air-cooling to the room temperature to obtain the medium-manganese steel medium-thickness plate, and the structure of the medium-manganese steel medium-thickness plate is a tempered martensite and a fine inversion austenite dual-phase structure.

Description

technical field [0001] The invention belongs to the field of iron and steel production in the metallurgical industry, and in particular relates to a Ti microalloyed medium-manganese steel plate for offshore platforms and a preparation method thereof. Background technique [0002] Marine engineering equipment is the premise and foundation for the development of the national marine economy. It is at the core of the value chain of the marine industry and has broad market application prospects. The average proven rates of my country's offshore oil and natural gas resources are 12.3% and 10.9%, respectively, which are far lower than the world's average proven rates of 73.0% and 60.5%. Compared with land, offshore oil and gas exploration and development have great potential. As an important part of offshore engineering equipment, the demand for medium and thick steel plates on the platform continues to expand, but my country still cannot meet the demand in the field of high-end of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/50C22C38/02C22C38/06C22C38/44C22C38/42C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C21D2211/001C21D2211/008C22C38/02C22C38/06C22C38/42C22C38/44C22C38/50C22C38/58
Inventor 杜林秀胡军董营高秀华吴红艳刘悦张彬刘玉杰
Owner NORTHEASTERN UNIV LIAONING
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