DIN 2391-1

cold rolled precision seamless steel tubes

Name: GB/T 3639 Cold drawn or cold rolled precision seamless steel tubes
GB/T 8713 precision seamless tubes for hydraulic pressure and pneumatic functions
Size (mm): O.D.: 6.0∼219.0; W.T: 1∼30; L: max 12000
Applications: autos, machinery, oil cylinders, motorcycle shock absorbers, and the inner cylinders of auto shock absorbers.

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Seamless mechanical tubing is manufactured from carbon and alloy steels for structural or other mechanical purposes involving machining or heat treating, where close tolerances, smooth finish, or definite physical properties are important factors. Cold Drawn Seamless stocks are generally carried to OD and ID tolerances, except when the ID is less than 50 percent of the OD. The latter sizes and hot finished seamless stocks are carried in warehouse to OD and wall tolerances.

Specifications:

OD (mm)

Wall Thickness (mm)

2.5

3.5

4.5

6.5-7

7.5-8

8.5-9

9.5-10

Φ25-Φ28

●

Φ32

●

Φ34-Φ36

●

Φ38

●

Φ40

●

Φ42

●

Φ45

●

Φ48-Φ60

●

Φ63.5

●

Φ68-Φ73

●

Φ76

●

Φ80

●

Φ83

●

Φ89

●

Φ95

●

Φ102

●

Φ108

●

Φ114

●

Φ121

●

Φ127

●

Φ133

●

Φ140

●

Φ146

●

Φ152

●

Φ159

●

Φ168

●

GB/T 3639 Cold drawn or cold rolled precision seamless steel tubes GB/T 8713 precision seamless tubes for hydraulic pressure and pneumatic functions
Applications:	>hydraulic pressure, pneumatic functions, autos, machinery, oil cylinders, motorcycle shock absorbers, and the inner cylinders of auto shock absorbers.
Size (mm):	>O.D.:6.0-224.0; W.T.:1-15; L: max 12000

Grade and Chemical Composition (%):

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

Steel 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	-

Mechanical Properties (Mpa):

Steel grade	BK		BKW		BKS			GBK		NBK
Steel grade	RmN/mm min	min	RmN/mm min	min	N/mm min	ReH N/mm min	min	N/mm min	min	N/mm min	ReH N/mm min	min
St35	480	6	420	10	420	315	14	315	25	340-470	235	25
St45	580	5	520	8	520	375	12	390	21	440-570	235	21
St52	640	4	580	7	580	420	10	490	22	490-630	355	22

Steel grade		Minimum values for delivery
Steel name	Steel number	+ C		+ LC		+ SR			+ A		+ N
Steel name	Steel number	Rm Mpa	A%	Rm Mpa	A%	Rm Mpa	ReH Mpa	A%	ReH Mpa	A%	Rm Mpa	ReH Mpa	A%
E215	1.0212	430	8	380	12	380	280	16	280	30	290-430	215	30
E235	1.0308	480	6	420	10	420	350	16	315	25	340-480	235	25
E355	1.0580	640	4	580	7	580	450	10	450	22	490-630	355	22

A53 carbon steel pipe is the most common carbon steel, widely used on customer demand for steel products used. A106 higher alloy content than the A53. Pipe connections are frequently used to pipe fittings, such as three-way. Steel corrosion helps a lot in life.

A106 steel tube

Corrosion Protection

Tees

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