... The transmission fluid with stitched tube GB8163-993 boiler seamless steel tube GB3087-19994 With high pressure boiler, seamless tube ... seamless steel tube YB528-658 GB9948-889 YB691-7010 GB3088-199911 GB5312-199912 GB3639-199913 all kinds of alloy pipes 16Mn ... ,27SiMn,15CrMo,35CrMo,12CrMov,20G,40Cr,12Cr1MoV,15CrMo. hot rolled seamless steel pipes/tubes