Seamless steel pipe is a steel pipe made of whole round steel perforated with no welds on the surface, called seamless steel pipe.
According to the production method, seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, cold-drawn seamless steel pipe, extruded seamless steel pipe, top pipe and so on.
Seamless steel pipe main production steps
Steel smelting → steel refining → continuous casting → rolling billet → rolling round billet
Billet preparation and inspection → billet sawing and cutting → billet heating → piercing → rolling → pipe reheating → fixed (reduced) diameter → cooling → finished pipe straightening → finishing → cutting ends → inspection (size, surface) → non-destructive testing → hydrostatic test → through the diameter → marking → weighing → packaging → warehousing → shipment
Material
seamless steel pipe can be categorized into ordinary and high-quality carbon structural steel (Q215-A ~ Q275-A and 10~50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless and acid-resistant steel and so on.
Usage
The use of seamless steel pipe is also very wide, can be divided into general purpose (for water, gas pipelines and structural components, mechanical parts) and special (for boilers, geological exploration, bearings, acid-resistant, etc.) two categories.
