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Cold Drawn Precision Seamless Steel Tube

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Specification for Cold Drawn Precision Seamless Steel Tube

OD: 48mm(1-1/2’’)~325mm(12’’)

WT: 3mm~45mm

LENGTH: 4m~10m

Standards & Grades for Cold Drawn Precision Seamless Steel Tube

EN: E215, E235, E355, C45E, 25CrMo4, 42CrMo4, CK45, S45C, E410, E470

DIN: ST52, ST52.3, ST52.4

GB: 20#, 45#, 16Mn, Q345B, Q345C, Q345D, Q345E, 25Mn, 27SiMn

Surface Treatment：

l Normal surface

l Inner surface or outside surface treatment, honing process, grinding, polishing, oiled...etc.

l Surface roughness Ra0.3um- Ra0.6um.

l End finish: Plain ends or bevelled ends.

H8 Tolerance:

ID range	Tolerance	ID range	Tolerance
18< d ≤30	+0/+0.033	180< d ≤250	+0/+0.072
30< d ≤50	+0/+0.039	250< d ≤300	+0/+0.081
50< d ≤80	+0/+0.046	300< d ≤315	+0/+0.081
80< d ≤120	+0/+0.054	315< d ≤400	+0/+0.089
120< d ≤180	+0/+0.063	400< d ≤500	+0/+0.097

Hot Treatment & Delivery Condition for Cold Drawn Precision Seamless Steel Tube

BK + C	BKW + LC	BKS + SR	GBK + A	NBK + N	Q + T
Cold Rolled	Cold Drawn	Stress Relieved	Annealed	Normalized	Quenched + Tempered

Application for Cold Drawn Precision Seamless Steel Tube:

Fluid Conveying

Hydraulic Cylinder
Pneumatic Cylinder
High Precision Machine Pipes
Agriculture Machine
Boiler Pipe & Industry Construction
Mechanical Processing

Automobile Industry

Condensing Unit Pipe

Cold Drawn Precision Seamless Steel Tube is a kind of high precision steel tube material processed by cold drawing or hot treatment. Its main features are no oxide layer on the inner and outer surface of the steel tube, no leakage under high pressure, high precision, high finish, no deformation during cold bending, no cracks in the flapping and flattening. Therefore, cold drawn precision seamless steel tube is mainly used in hydraulic system/pneumatic system, automobile manufacturing, project machinery, petrochemical industry, power station, boiler equipment and other industries.

DIN 2391-1 Chemical Composition

Grade	Chemical Composition(%):
Grade	C max	Si max	Mn	P max	S max
DIN 2391 St 35	0.17	0.35	≥0.40	0.025	0.025
DIN 2391 St 45	0.21	0.35	≥0.40	0.025	0.025
DIN 2391 St 52	0.22	0.55	≤1.60	0.025	0.025

Grade		Chemical Composition(%):
Steel name	Steel number	C max	Si max	Mn	P max	S max	Al min
E215	1.0212	0.10	0.05	0.70	0.025	0.025	0.025
E235	1.0308	0.17	0.35	1.20	0.025	0.025	-
E355	1.0580	0.22	0.55	1.60	0.025	0.025	-