770 MPa-stage low-welding-crack-sensitivity pressure container steel and manufacturing method thereof

A technology for low welding cracks and pressure vessels, applied in the field of 770MPa low welding crack sensitivity pressure vessel steel and its manufacturing, can solve the problems of reducing Mn and Nb content, increasing alloy content, and high production costs

Active Publication Date: 2018-04-20
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the present invention, a certain amount of B is added to the chemical composition to strengthen, the content of Mn and Nb is reduced, and the content of alloys such as Ni, Cr, and Mo is increased, and the off-line quenching process is adopted at the same time, but the production cost is higher

Method used

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  • 770 MPa-stage low-welding-crack-sensitivity pressure container steel and manufacturing method thereof
  • 770 MPa-stage low-welding-crack-sensitivity pressure container steel and manufacturing method thereof
  • 770 MPa-stage low-welding-crack-sensitivity pressure container steel and manufacturing method thereof

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Embodiment Construction

[0050] The 770MPa grade low welding crack sensitivity pressure vessel steel of the present invention and its manufacturing method are further described below through specific examples:

[0051] Table 1 lists the weight percentages of the chemical components of the 770MPa low weld crack sensitivity pressure vessel steels of Examples 1 to 6 with serial numbers 1 to 6 and the pressure vessel steels of Comparative Examples 1 to 2 with serial numbers 7 to 8 (The balance is Fe and unavoidable impurities).

[0052] The chemical composition (wt, %) of the embodiment of table 1

[0053]

[0054] The 770MPa grade low weld crack sensitivity pressure vessel steels of Examples 1 to 6 with serial numbers 1 to 6 of the present invention and the pressure vessel steels of Comparative Examples 1 to 2 with serial numbers 7 to 8 are manufactured according to the following methods, mainly Process parameter is as described in table 2, and heat treatment process parameter is as shown in table 3:...

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Abstract

The invention provides 770 MPa-stage low-welding-crack-sensitivity pressure container steel. The 770 MPa-stage low-welding-crack-sensitivity pressure container steel comprises the following chemical components in percentage by mass: 0.05-0.10 of C, Si not more than 0.10, 1.00-2.00 of Mn, P not more than 0.010, S not more than 0.002, 0.015-0.045 of Als, 0.50-1.00 of Ni, 0.03-0.08 of Nb, 0.02-0.08 of V, 0.010-0.030 of Ti, Cu not more than 0.50, Cr not more than 0.50, Mo not more than 0.50, and the balance of Fe and inevitable impurities, wherein the mass percentages of Cu, Cr and Mo meet that [Cu]+[Cr]+[Mo] is not more than 0.90 and not less than 0.30. Through component design, inclusion control, rolling and heat treatment, the steel achieves high strength, high toughness and low welding crack sensitivity, and can be used for manufacturing various liquefied petroleum gas storage tank equipment.

Description

technical field [0001] The invention relates to the field of pressure vessel steel manufacturing, in particular to a 770MPa grade low welding crack sensitivity pressure vessel steel and a manufacturing method thereof. Background technique [0002] With the rapid development of my country's energy, petroleum, chemical and other industrial industries, the storage of petroleum and other related products is related to national energy security and plays an important and irreplaceable role. The steel used for stationary storage tanks in my country has always used 07Mn series steel with a lower strength level (Rm is 610MPa grade), resulting in a thicker tank wall, resulting in higher manufacturing costs for existing storage tanks and increased welding difficulty. It limits the large-scale (high parameter) development of fixed storage tanks. With the rapid development of the petrochemical industry, the demand for large liquefied petroleum balloon tanks is gradually increasing, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/58C22C38/48C22C38/46C22C38/50C22C38/42C22C38/44C21D1/18C21D8/02
CPCC21D1/18C21D8/0226C21D8/0263C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 刘文斌李书瑞王宪军杨秀利战国锋陈颜堂程吉浩郭斌
Owner 武汉钢铁有限公司
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