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

A manufacturing method and fuel tank technology, applied in the field of steel production, can solve the problems of reduced welding performance, high alloy cost, and extended delivery time, and achieve the effects of no reduction in strength and toughness, high strength, and excellent low-temperature toughness

Inactive Publication Date: 2021-01-15
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A 540MPa grade LPG fuel tank steel provided in this example has the following chemical composition and mass percentages: C: 0.07%, Si: 0.40%, Mn: 1.60%, P: 0.008%, S: 0.002%, Alt: 0.058%, N: 0.0038%, Nb: 0.025%, Ti: 0.014%, Cr: 0.20%, Ni: 0.20%, and the balance is Fe and unavoidable impurities.

[0031] The manufacturing method includes molten iron desulfurization pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, slab heating, controlled rolling and controlled cooling after rolling. Specifically: heat a 260mm slab to 1150°C, hold it for 300min, and carry out two Stage controlled rolling, the rolling temperature in the recrystallization zone is 1050°C; the thickness of the billet to be warmed is 80mm, the deformation in each pass is 32mm, the rolling start temperature in the non-recrystallization zone is 785°C, and the final rolling temperature is 770°C. The steel plate is 30mm, weak cooling is adopted after rolling, the cooling rate...

Embodiment 2

[0033] A kind of 500MPa grade LPG fuel tank steel provided by this embodiment differs from Embodiment 1 in that:

[0034] Its chemical composition and mass percentage are as follows: C: 0.09%, Si: 0.40%, Mn: 1.55%, P: 0.008%, S: 0.002%, Alt: 0.040%, N: 0.0040%, Nb: 0.005%, Ti: 0.010%, Cr: 0.10%, Ni: 0.25%, Cu: 0.10%, and the balance is Fe and unavoidable impurities.

[0035] Heat the 320mm billet to 1130°C, keep it warm for 300min, and carry out two-stage controlled rolling. The rolling temperature in the recrystallization zone is 1050°C; The rolling start temperature is 765°C, the finish rolling temperature is 760°C, the steel plate after rolling is 50mm, water cooling is adopted after rolling, the cooling rate is 10°C / s, the reddening temperature is 540°C, and then air-cooled to room temperature.

[0036] Depend on figure 1 It can be seen that the microstructure of the steel plate is ferrite + bainite + a small amount of pearlite, the grain size of ferrite is 9-11.5, the b...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0263C21D2211/002C21D2211/005C21D2211/009C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58
Inventor 张晓雪陈林恒赵晋斌车马俊邱保文李恒坤伯飞虎黄建华
Owner NANJING IRON & STEEL CO LTD
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