Marine engineering

GB/T 18248 seamless gas cylinder tube is a kind of seamless steel tube for gas cylinders.

ASTM A213/A213M standard, which covers a range of grades of minimum-wall-thickness, seamless, and cold-drawn ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes, including the T9 grade.

DIN 17175 heat-resistant seamless steel pipe is a seamless steel pipe used in the boiler industry. It has high heat resistance and is commonly used in boilers, pressure vessels and other equipment that need to withstand high temperature and high pressure.

A519 Gr 4130 steel pipe is an alloy steel seamless pipe, mainly used in medium-sized machinery manufacturing industry, such as shafts, spindles, highly loaded control wheels, bolts, studs, gears, etc.