ISO9001-2008 CERT. Grade: st45 (DIN2391) ST52,CK45 Delivery condition: BK +S (heat treatment on 550-600c) Tolerance :ISO H8

***1.main diameter: ID from 32mm-320mm

***2. main material: ST45,ST52.7, CK45,27SiMn

***3.length: 5.8meter unfixed or according to request

***4.inside roughness:0.2um-0.8um

***5. manufacture method:

precise cold drawn

↓

low temperature annealing

↓

honed inside

↓

anti rust handle

↓

packing

***.delivery condition: BKS

 ***payment term:30% prepaid,

BK+S seamless precise polished and honed tube