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Manufacture method of extremely thick ocean engineering steel plate with low compression ratio and super high-strength strain age

A strain aging and marine engineering technology, which is applied in the field of steel plate manufacturing, can solve the problems of low strength of steel grades and cannot be adapted to marine engineering steel, etc., achieves fewer rolling passes, enhances strain aging resistance, and reduces waiting time. Effect

Active Publication Date: 2015-01-21
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of steel has low strength and cannot meet the needs of marine engineering steel

Method used

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  • Manufacture method of extremely thick ocean engineering steel plate with low compression ratio and super high-strength strain age
  • Manufacture method of extremely thick ocean engineering steel plate with low compression ratio and super high-strength strain age
  • Manufacture method of extremely thick ocean engineering steel plate with low compression ratio and super high-strength strain age

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Embodiment

[0034] Embodiment 1-3 is a manufacturing method of steel for marine engineering with low compression ratio, ultra-high strength, high toughness, and excellent strain aging performance. It adopts a low-carbon, low-phosphorus, and low-sulfur smelting process, cooperates with other trace alloy elements, and uses Controlled rolling and controlled cooling technology produces high-strength and high-toughness steel for marine engineering through off-line quenching and tempering heat treatment. The main production process route is: hot metal desulfurization pretreatment→converter smelting→LF refining→RH refining→continuous casting→slab stacking and slow cooling→slab inspection→slab identification→slab acceptance→slab heating→scaling descaling→rolling Manufacturing→cooling→flaw detection→quenching→tempering→cutting, sampling→printing logo→storage→inspection.

[0035] The main chemical composition of each embodiment is as shown in table 1:

[0036] Table 1 Main chemical composition (wt...

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Abstract

The invention discloses a manufacture method of an extremely thick ocean engineering steel plate with low compression ratio and super high-strength strain age, which performs reasonable setting and optimization to controlled rolling and controlled cooling technology through converter smelting, LF and RH refining, so as to perform quenched-tempered heat treatment. The steel plate has good performance, the tensile strength is 780 to 850 MPa, the yield strength is 720 to 800 MPa, the percentage of elongation is 18 to 21 percent, the low-temperature transverse impact at minus 40 DEG C is larger than or equal to 120J, the low-temperature aging impact property at minus 40 DEG C is larger than or equal to 100J, the steel plate has ultrahigh strength, high tenacity and excellent low temperature aging tenacity, and the production technology is stable.

Description

technical field [0001] The invention relates to a method for manufacturing a steel plate, in particular to a method for manufacturing a low-compression bit-thick, super-high-strength strain-aging steel plate for ocean engineering. Background technique [0002] With the development of economy and society, the growth rate of human energy consumption is increasing exponentially. Terrestrial energy is becoming increasingly exhausted, and ocean energy is increasingly becoming a blue ocean that countries all over the world are competing to exploit. According to reports, the undeveloped ocean oil resources (including condensate oil) are 54.8 billion tons, and the undeveloped natural gas resources are 78.5 trillion cubic meters, accounting for 47% and 46% of the world's undeveloped oil and gas resources respectively. huge. It can be seen that the offshore engineering equipment for offshore oil and gas drilling and production operations has broad prospects, and there are higher req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/50C21D8/02
Inventor 李恒坤崔强刘朝霞车马俊邓伟
Owner NANJING IRON & STEEL CO LTD