Grade：ST 52，stainless steel, alloy steel, and special steel
Size range： 
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 (%) 

Si
(Max)

Mn
(Max)

C
(Max)

P
(Max)

S
(Max)
0.55 1.6 0.22 0.025 0.025

MECHANICAL PROPERTIES 

Tensile strength Min Yield Point Min Elongation % Min
580 N/mm² 420 N/mm² 10

Marking: JW, ID, OD 

Package: 
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.