• 

• Other requirements

  Chrome coating:0.03-0.15

  Coating hardness:HRC60-62

  Phosphating film thickness:12-25um

• 

• Hardness and Straightness

  Hardness: HB280~400

  Straightness: full length ≤5mm

  Straightness: per meter ≤1mm

• 

• Size and Material

  Diameter:Φ100~Φ350mm

  Length:3000~12000mm

  Material: alloy steel 9CrSi,H11,H13