Steel pipe 1)Standard uniform size 2)Through a number of authentication 3)standards :ASTM,GB,DIN,JIS 4)First-class quality ... ,DINDespite of the above standards, we can also supply seamless steel pipes with standardof API 5L---2000, DIN, JIS and so ... requirements of our clients. Application: Seamless steel pipes for low and medium pressure boiler, high pressure boiler, ship-building,liquid service, ...