Steel for 540 MPa-grade LPG fuel tank and manufacturing method of steel

Abstract

The invention discloses steel for a 540 MPa-grade LPG fuel tank and a manufacturing method of steel, and relates to the technical field of steel production. The steel comprises the following chemicalcomponents by mass percentage: 0.07%-0.10% of C, 0.20%-0.40% of Si, 1.40%-1.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.002% of S, 0.040%-0.060% of Als, less than or equal to0.0040% of N,0.005%-0.040% of Nb,0.005%-0.020% of Ti,less than or equal to 0.020% of Cr,less than or equal to 0.25% of Ni,less than or equal to 0.20% of Cu, less than or equal to 0.50% of Cu+Cr+Ni and the balance of Fe and unavoidable impurities. Compared with normalizing and quenched and tempered delivery, the steel has the advantages of being low in alloy cost, low in production cost and shortin delivery period.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a steel for 540MPa LPG fuel tank and a manufacturing method thereof. Background technique [0002] With the emphasis on and dependence on clean energy at home and abroad, LPG has become an indispensable clean gas fuel in developed countries and a national strategic reserve material. The marine industry Alternative fuels are emerging as the maritime industry works to reduce atmospheric emissions and meet the International Maritime Organization's (IMO) Greenhouse Gas Reduction Strategy. LPG fuel can reduce ships' atmospheric emissions, including greenhouse gases and other pollutants. [0003] The strength and toughness of the steel plate produced by TMCP will decrease after stress relief treatment, so it is not suitable for fuel tank steel, and it is usually delivered in normalized or quenched and tempered state. Normalized and quenched and tempered steel plates need to ...

AI Technical Summary

Problems solved by technology

Normalized and quenched and tempered steel plates need to add a large amount of alloy elements to ensure low temperature impact performance, so the welding performance is reduced, and at the same time, it is restricted by high alloy cost and long production cycle

[0004] CN104831181A patent "a steel plate for LPG marine storage tank and its manufacturing method", the steel plate for storage tank has low welding crack sensitivity and excellent welding performance, and is produced by quenching and tempering process, adding that the steel plate has to undergo two heat treatments , resulting in extended lead times and increased manufacturing costs

[0005] CN104674110 patent "a low-temperature steel plate for pressure vessels", in order to improve the strength and toughness, a high content of Ni element is added, resulting in an increase in the cost of the alloy, which is not conducive to mass production

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