Cold drawn tube

Detailed Product Description

Steel grade :ST45(20#) ck45(45#) ST52(16Mn) 27SiMn 25Mn
Processing	Cylinder diameter/mm	Length	Straightness	Size accuracy	Wall thickness/mm	Inner bore
						roughness
Cold-drawn	48~325	≤12m	0.3~0.8mm/m		±10%	0.8~1.6um
Honed	48~325	≤10m	0.3~0.8mm/m	H8~H9	±10%	0.3~0.8um
Mechanical Property
Material	Tensile	Yield	Elongation	Hardness
	strength	strength
20#	530 N/mm2	505σsN/mm2	12δs%	175HB
45#	660 σN/mm2	630σsN/ mm2	6δs%	207HB
16Mn	595 σN/mm2	570σsN/ mm2	9δs%	190HB
27SiMn	840 σN/mm2	805σsN/ mm2	7.5δs%	230HB
Honed tube size tolerance
ID size	ID deviation (mm)
	H7	H8	H9	H10
30	0.021	0.033	0.052	0.084
	0	0	0	0
>30~50	0.025	0.039	0.062	0.100
	0	0	0	0
>50~80	0.030	0.046	0.074	0.120
	0	0	0	0
>80~120	0.035	0.054	0.087	0.140
	0	0	0	0
>120~180	0.040	0.063	0.100	0.160
	0	0	0	0
>180~250	0.046	0.072	0.115	0.185
	0	0	0	0
>250~315	0.052	0.081	0.130	0.210
	0	0	0	0
>315~400	0.0527	0.089	0.140	0.230
	0	0	0	0