... 3)delivery in time We mainly manufacture seamless steel pipe, with over 10 years experience in this field ... plunge2 Standard: ASTM DIN ASTMA519 IN23913 Material Carbon steel: 10#(ST35,E235,CK10),20#(ST45,E255),35 ... #(ST55),45#(CK45) Alloy steel: 30CrMo,16Mn(st52,Q345,E355),25Mn,37Mn5 ... tubes for hydraulic cylinder c) high strength tube bearing d) formable tubes for machine and vehicles 6 ...