Forming and fabrication method of ultra-high strength steel seamless high pressure gas cylinder

Abstract

The invention belongs to the technical field of the processing of seamless steel tubes and provides a forming and fabrication method of an ultra-high strength steel seamless high pressure gas cylinder. The forming and fabrication method of the ultra-high strength steel seamless high pressure gas cylinder specifically comprises the following steps of 1) heating the nosing sections of a seamless steel tube for processing the large-volume steel seamless high pressure gas cylinder to a temperature of 1000-1200 DEG C; performing hemispheric nosing and spinning on the nosing sections of the seamless steel tube for 8-10 times to obtain hemispheric cylinder shoulders; 3) obtaining the cylinder lip by performing cylinder lip spinning forming on the seamless steel tube for 3-4 times; 4) finishing and spinning the surface. According to the forming and fabrication method of the ultra-high strength steel seamless high pressure gas cylinder, ultra-high strength steel with the yield strength larger than 980 MPa can be used for fabricating the seamless high pressure air cylinder of 40 MPa level; shortcomings such as incontinuity, strength reduction, brittle fracture and tensile stress concentration and the like due to welding seams of a welded air cylinder produced through a traditional method can be prevented, and the gas tightness and pressure-resistant performance of the air cylinder can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of processing seamless steel pipes, and relates to a method for forming and manufacturing an ultra-high-strength steel seamless high-pressure gas cylinder, and is especially suitable for a 40MPa-level large-volume steel seamless high-pressure gas cylinder with strict performance and quality requirements. Background technique [0002] At present, the 25MPa high-pressure gas cylinders used in my country's ships are steel welded structure gas cylinders. The manufacturing process is as follows: firstly, the steel plate is rolled into a cylinder shape, and the cylinder body is formed by welding, and then the steel plate is stamped into the shape of the head by stamping method. Finally, the head and the two ends of the cylinder body are welded together to make a high-pressure gas cylinder. The gas cylinder thus manufactured has a longitudinal weld and two circumferential welds. However, my country's military standa...

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Problems solved by technology

[0003] For our country to vigorously develop new ships facing the deep sea, the existing 25Mpa seamed high-pressure gas cylinders can no longer meet the needs. It is necessary to increase the pressure level of the high-pressure air cylinders to 40Mpa and adopt a seamless structure, which fundamentally overcomes the Welded gas cylinders produced by traditional methods have defects such as weld-related discontinuity, strength reduction, embrittlement, and tensile stress concentration, which greatly improves the airtightness and pressure resistance of gas cylinders

Therefore, for 40MPa high-pressure gas cylinders, it is necessary to use ultra-high-strength steel with a yield strength greater than 980MPa and adopt a seamless structure. However, the forming and manufacturing technology for steel seamless high-pressure gas cylinders of such materials at 40MPa has not yet been seen in China. to report

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