Grade：ST 52，stainless steel, alloy steel, and special steel
Inside diameter: from 40 to 1000mm,
Max length:20 meters.
Straightness: 0.5 /1000
Tolerance EXT: DIN 2391
Tolerance INT: ISO H7, H8, H9
Roughness(Ra): 0.1 to 0.2µ
Impact test: -20℃, 27 J (only for special requirement)
Type：cold drawing, normalizing treatment, honing.
ST 52 CHEMICAL COMPOSITION (%)
|Tensile strength Min||Yield Point Min||Elongation % Min|
|580 N/mm²||420 N/mm²||10|
Marking: JW, ID, OD
Anti rust oiled coating on the inside and outside of the surface, plastic caps at both ends.
banding with steel/plactic strips, braiding parcel at outside.