DIN 2391 Cold Drawn or Cold Rolled Steel Tube

DIN 2391-1 cold Drawn or cold rolled steel tube is used in hydraulic & pneumatic cylinder, mechanical and Automotive engineering.

Related information for DIN 2391

• JIS Number and Corrensponding Foreign Standards DIN 2391-81 Part 2 SEAMLESS
• PRECISION STEEL TUBES (DIN2391-81)
• Material Comparison Tables (ASTM →KS, JIS, DIN, BS, NBN, NF, UNI)
• DIN 2391-81 Part 2 Seamless Precision steel tubes

DIN 2391 standard specifies the Seamless steel tubes used forMechanical and Automobile.

• for Atuo usd
• for machinery use
• Oil cylinder tube
• Motorcycle shock reducer steel tubes
• Auto shock reducer inner cylinder

• GB/T 3639 Cold drawn or cold rolled precision seamless steel tubes
• GB/T 8713 inside precision seamless tubes for hydraulic pressure and pneumatic services
  

Marking:

• Pipes are supplied with marking according to standard and customer request.
• Marking is paint on the ends of pipes.
• The same data, as well as additional information per customer’s request, is indicated on the bundle’s tags.

Delivery:

• Pipes are supplied in hexagonal bundles or round bundles tied with steel strip.
• Weight of bundle – up to 5000 kg upon request of customer.
• Each bundle is furnished with three tags.
  

Features Specifications

OD(mm)	Wall Thickness Unit(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	●	●	●	●	●	●
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							●	●	●	●	●	●	●	●

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		Mpa		Mpa	Mpa		Mpa		Mpa	Mpa
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	1.0580	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
	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

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.

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.