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): max 0.4µ
Impact test: -20℃, 27 J (only for special requirement)
Type：cold drawing, normalizing treatment, honing.
ST 52 CHEMICAL COMPOSITION (%)
Anti rust oiled coating on the inside and outside of the surface, plastic caps at both ends. Banding with steel/plastic strips, braiding parcel at outside.