Differences between steel pipes and pipes
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A large-diameter welded steel pipe LG is described in that specification. What grades are there for steel pipes? Is this the difference?
The following content is excerpted from Huang Chunfang, Sinopec Press and courseware Classification of steel according to chemical composition Classification according to smelting method Classification according to quality Classification according to use Classification according to the method of giving its shape Commonly used pipes Steel pipes Cast iron pipes Plastic pipes Cement pipes The mechanical properties of steel increase with the increase in carbon content, and its strength and hardness continue to increase.； The plasticity and toughness continue to decrease. The weldability continues to deteriorate as the carbon content increases. Seamed steel pipes (welded steel pipes) Water and gas pipes Welded steel pipes Seamless steel pipes Cold-drawn steel pipes Hot-rolled steel pipes Seamed steel pipes (welded steel pipes) "Water and gas transmission steel pipes" (GB3091-82 ； GB3092-82) Galvanized pipe black iron pipe material low carbon steel welding form high frequency welding, CO2 shielded welding coil welded steel pipe straight seam coil welded pipe spiral coil welded pipe (GB9711-88) material low carbon steel (Q235B) welding form automatic welding machine