Stainless steel seamless pipe is a long strip of steel with a hollow section and no joints around it.

Type

According to the rolling method, it is divided into hot-rolled, hot-extruded and cold-drawn (rolled) stainless steel pipes.

Specification

The length of the steel pipe is usually 1.5 ~ 10m for hot-rolled steel pipe (indefinite length), and the hot-extruded steel pipe is equal to and greater than 1m. For cold drawn (rolled) steel pipes with a wall thickness of 0.5 to 1.0 mm, 1.0 to 7 m; for those with a wall thickness greater than 1.0 mm, 1.5 to 8 m.

There are 45 types of hot-rolled (hot-extruded) steel pipes with a diameter of 54 to 480mm; a total of 36 types with a wall thickness of 4.5 to 45mm. There are 65 types of cold-drawn (rolled) steel pipes with a diameter of 6 to 200mm; a total of 39 types with a wall thickness of 0.5 to 21mm.

Manufacturing process

1. Hot rolling (extruded seamless steel pipe): round tube billet → heating → perforation → three-roll skew rolling, continuous rolling or extrusion → pipe removal → sizing (or diameter reduction) → cooling → straightening → hydraulic test (or flaw detection)→marking→warehousing

2. Cold drawn (rolled) seamless steel pipe: round tube billet → heating → perforation → heading → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → billet → heat treatment → straightening →Hydrostatic test (flaw detection)→Marking→Storage.

Calculation formula and product use

(outer diameter - wall thickness) * wall thickness * 0.02491 * unit price = price per meter

Used in town houses, public buildings and tourist facilities, etc.