DIN 2391 seamless precision steel tubes

DIN 2391 standard specifies the Seamless steel tubes used for Mechanical and Automobile.
The main products of steel / steel grade: DIN2391-1(ST35, ST45, ST52).

Description Name:
DIN 2391 Seamless cold drawn tubes
DIN 2391 Seamless precision steel tubes
ST35 Precision tubes
ST45 Precision tubes
ST52 Precision tubes
Seamless precision tubes
DIN 2391 NBK Seamless Precision Steel Tubes
DIN 2391 ST35 Seamless precision steel tubes
DIN 2391 ST45 Seamless precision steel tubes
DIN 2391 ST52 Seamless precision steel tubes
ST 52 Honed tubes
ST52 cylinder tubes

Size: 6mm-350mm.
W.T.: 0.8mm-50mm.
Shape: Round.
Production type: Cold drawn or cold rolled.
Length: Single random length/ Double random length or as customer’s actual request max length is 10m.
Grade: St30 Si, St30 Al, St35, St45, St52.
Nansteel Manufacturing Co.,Ltd supplies a full range of DIN 2391 seamless precision steel tubes, click to check View of DIN 2391 Dimensional Table

Marking
The following marking shall be shown on a label attached to the bundle:
the manufacturer’s name or trade mark;
the specified dimensions;
the number of this European Standard;
the steel name or number;
the cast number;
the delivery condition;
in the case of specific inspection, an identification number (e. g. order or item number) which permits the correlation of the product or delivery unit to the related document.

Note:
Mill test certificates will be issued according to EN10204.3
The tubes Shall be Seamless cold drawn or cold rolled.
The manufacture should have TS16949 certificate.

Protection and Packing:
Packed in wooden box or bundles protected with plastic paper, and suitably protected for sea-worthily delivery or as requested.
The tubes shall be delivered with a temporary corrosion protection.
The type of protection shall be at the discretion of the manufacturer.

Application of DIN 2391 seamless precision steel tubes
for Atuo usd;
for machinery use;
Oil cylinder tube;
Motorcycle shock reducer steel tubes;
Auto shock reducer inner cylinder

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	0.1	0.05	0.7	0.025	0.025	0.025
E235	1.0308	0.17	0.35	1.2	0.025	0.025	-
E355	1.058	0.22	0.55	1.6	0.025	0.025	-

Mechanical Properties(Mpa)

Steel Grade		Minimum values for the delivery condition
Steel Name	Steel Number	BK		BKW		BKS			GBK		NBK
		Rm	A %	Rm	A %	Rm	ReH	A %	Rm	A %	Rm	ReH	A %
		Mpa	A %	Mpa	A %	Mpa	Mpa	A %	Mpa	A %	Mpa	Mpa	A %
St 30 Si	1.0211	430	8	380	12	380	280	16	280	30	290 to 420	215	30
St 30 Al	1.0212	430	8	380	12	380	280	16	280	30	290 to 420	215	30
St 35	1.0308	480	6	420	10	420	315	14	315	25	340 to 470	235	25
St 45	1.0408	580	5	520	8	520	375	12	390	21	440 to 570	255	21
St 52	1.058	640	4	580	7	580	420	10	490	22	490 to 630	355	22

Inspection and test list for the DIN 2391 Standard.

Inspection or test types	Test frequency
Inspection or test types	Internal test	Acceptance test
Chemical analysis	M	M
Tensile testing	M	One per tested batch
Flattening test or extension test	M	Two per tested batch
Dimension verification	M	M
Visual inspection	M	M
NDT in order to identify leaks	Individual	Individual

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