1. cold drawn seamless steel tube (suitable for honing or for skiving)
Specification: BS EN 10305 part 1:2002 E355+SR (DIN2391)
technical details
Steel grade:
E355 chemical composition %(max) mechanical properties(min)
(ST52) C Si Mn P S Yield Tensile Elongation
0.22 0.55 1.60 0.04 0.04 520N/mm2 580N/mm2 14%
Delivery Conditions: BK+S (stress relieved)
For sizes over 230mm OD with wall thicknesses greater than 16mm,the yield will be 490N/mm2 Min.
Tolerances
Outside Diameter : EN10305-1/DIN2391
Inside Diameter : with machining allowance -0.3mm to -0.5mm for honing
With machining allowance -0.8mm to -1.2mm for skiving
Inside straightness :1mm/1000mm or better
Eccentricity : OD<=110mm, max 5% of average wall
OD>110mm,max 7.5% of average wall
OD>230mm,max10% of average wall
Size range
Metric:OD30 to OD299 WT：3mm to 25mm
2. Honed tube (Cold drawn seamless steel tube in honed conditions)
Specification: BS EN 10305 part 1:2002 E355+SR (DIN2391)
technical details
Steel grade:
E355 chemical composition %(max) mechanical properties(min)
(ST52) C Si Mn P S Yield Tensile Elongation
0.22 0.55 1.60 0.04 0.04 520N/mm2 580N/mm2 14%
Delivery Conditions: BK+S (stress relieved)
For sizes over 230mm OD with wall thicknesses greater than 16mm,the yield will be 490N/mm2 Min.
Tolerances
Outside Diameter : EN10305-1/DIN2391
Inside Diameter : Generally H8 with surface finish max 0.4 microns Ra
Inside straightness:1mm/1000mm or better
Eccentricity : OD<=110mm, max 5% of average wall
OD>110mm,max 7.5% of average wall
OD>230mm,max10% of average wall
Size range
Metric: OD 30---299mm.WT3mm to 25mm
Other steel grade are optional , please see the steel grade table.