DIN 2391-1

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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Specifications:

OD (mm)

Wall Thickness (mm)

2

2.5

3

3.5

4

4.5

5

6

6.5-7

7.5-8

8.5-9

9.5-10

11

12

Φ25-Φ28

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Φ32

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Φ34-Φ36

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Φ38

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Φ40

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Φ42

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Φ45

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Φ48-Φ60

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Φ63.5

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Φ68-Φ73

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Φ76

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Φ80

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Φ83

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Φ89

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Φ95

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Φ102

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Φ108

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Φ114

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Φ121

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Φ127

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Φ133

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Φ140

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Φ146

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Φ152

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Φ159

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Φ168

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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 (%):
	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
	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
		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