1.What is the maxium diameter for seamless pipe?
Seamless tube production size up to 900mm diameter, minimum diameter of 4mm.The following figure shows the specification and material name of seamless steel pipe:
| Executive Standard | Grade / Material | Application |
| ASTM A53 | A,B | Black and Hot-Dipped Zinc-Coated Steel Pipes Welded and Seamless |
| ASTM A106 | A,B | Seamless Carbon Steel for High Temperature Service |
| ASTM A179 | Low Carbon Steel | Seamless Cold-Drawn Low-Carbon Steel Heat Exchanger and Condenser Pipes |
| ASTM A192 | Low Carbon Steel | Seamless Carbon Steel Boiler Tubes for High Pressure |
| ASTM A210 | A1,C | Seamless Medium-Carbon and Alloy Steel Boiler and Superheater Pipe |
| ASTM A213 | T5,T11,T12,T22,TP 347H | Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-Exchanger Pipes |
| ASTM A312 | TP304/304L, TP316/316L | Seamless Steel Pipe for Stainless Materials |
| ASTM A333 | Gr.6 | Seamless and Welded Steel Pipe for Low-Temperature Service |
| ASTM A335 | P9,P11,P22 | Seamless Ferritic Alloy Steel Pipe for High-Temperature Service |
| ASTM A519 | ASTM A519 | Seamless Carbon and Alloy Steel for Mechanical Tubing |
| ASTM A789 | Seamless Ferritic/Austenitic Stainless Steel Tubing for General Service |
2.How do you make a seamless steel pipe？
①The main production process of hot rolled seamless steel pipe：
Preparation and inspection of tube blank → heating of tube blank → perforation → rolling of tube → reheating of steel tube → diameter determination (reduction) → heat treatment → straightening of finished tube → finishing → inspection (non-destructive, physical and chemical inspection, table inspection) → storage
② The main production process of cold rolled (drawn) seamless steel pipe:
Billet preparation → pickling lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection
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