DIN2391 Seamless Precision Steel Tube

DIN2391 Seamless Precision Steel Tube

DIN2391 Seamless Precision Steel Tube

BKS, carbon steel tubes, din 2391, precision steel tube, Seamless tube, seamless tubes, steel tubes

DIN 2391 standard specifies theSeamless Precision Steel Tube used for Mechanical and Automobile.

Carbon steel tubes for machine structural purposes .
Standard:

• DIN2391-1: Seamless Precision Steel Tube.
• EN 10305-1: Steel tubes for precision applications.

Size (mm):

• Outer Dimensions: 4.0mm-60.0mm
• Wall Thickness: 0.5mm-8 mm
• Length: max 6000mm

Application:

• motor-car construction
• pneumatic
• hydraulic operating mechanisms

Steel grade:

• DIN2391-1 ST35
• DIN2391-1 ST45
• DIN2391-1 ST52

Delivery Condition:

• GBK, BKS, BK, BKW, NBK

Inspection and Test:

• Chemical Composition, Mechanical Properties
• Visual and Dimension Test
• NDT
• Grain Size Test

Surface treatment:

• Oil-dip, Varnish, Shot Blasting

Packing:

• Inner packing:Caps on two ends of every pipe
• Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements .
• Surface treatment:Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.
• Marking: as per customers requirement

DIN2391-1: Chemical compositions(%)

Grade	C	Si	Mn	P	S
DIN2391 ST35	≤0.17	≤0.35	≥0.40	≤0.050	≤0.050
DIN2391 ST45	≤0.21	≤0.35	≥0.40	≤0.050	≤0.050
DIN2391 ST52	≤0.22	≤0.55	≥1.60	≤0.050	≤0.050

DIN2391-1: Mechanical properties

Grade	BK		BKW		BKS			GBK		NBK
	Rm N/mm min	min	Rm N/mm min	min	N/ mm min	ReH N/mm min	min	N/ mm min	min	N/mm min	ReH N/mm min	min
DIN2391 ST35	480	6	420	10	420	315	14	315	25	340-470	235	25
DIN2391 ST45	580	5	520	8	520	375	12	390	21	440-570	235	21
DIN2391 ST52	640	4	580	7	580	420	10	490	22	490-630	355	22

Tubes according to EN 10305-1

EN 10305 Seamless cold drawn precision steel tubes for mechanical applications and for hydraulic and pneumatic power systems.

Typical fields of application are in the automotive, furniture and general engineering industries.

Steel tubes for precision applications-Technical delivery conditions-Part 1: Seamless cold drawn tubes.

Seamless Precision Steel Tubes according to EN 10305-1

Standard and Steel grade:

• EN10305-1 E215
• EN10305-1 E235
• EN10305-1 E355

Feature:

High precision and high brightness, the inner and outer surface of the tubes have high cleanness without oxid mechanical properties of the final tubes also come out excellent promising no leakage under high pressure no deformation after cold-bent and no cracks when flaring and flattening ensuring the efficient operation in all service.

Chemical analysis [%] of  EN10305-1

Steel grade	C	Si	Mn	P	S	V	Nb	Al
EN10305-1 E215	≤0,10	≤0,05	≤0,70	≤0,025	≤0,025	-	-	≥0,025
EN10305-1 E215	≤0,17	≤0,35	≤1,20	≤0,025	≤0,025	-	-	-
EN10305-1 E215	≤0,22	≤0,55	≤1,60	≤0,025	≤0,025	-	-	-

 Mechanical properties of  EN10305-1

Steel grade	+C		+LC		+SR			+A		+N
	Rm	A	Rm	A	Rm	ReH	A	Rm	A	Rm	ReH	A
	MPa	%	MPa	%	MPa	MPa	%	MPa	%	MPa	MPa	%
E215	430	8	380	12	380	280	16	280	30	290 – 430	215	30
E235	480	6	420	10	420	350	16	315	25	340 – 480	235	25
E355	640	4	580	7	580	450	10	450	22	490 – 630	355	22

Quality grade

The tubes are supplied in the following quality grades :

A) precision steel tubes intended primarily for mechanical stressing, without any particular quality requirement and without acceptance test certificate.
B) precision steel tubes intended primarily for mechanical stressing, with special quirement and exclusively with acceptance test certificate.
C) precision steel tubes with special requirement according to section 12. Theses requirements and corresponding tests must be agreed, with the customer having to specify his requirements at the time of enquiry and on ordering.

Condition on delivery:

Term	Symbol	Explanation
Cold-finished/hard (cold-finished as-drawn)	BK	No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft (lightly cold-worked)	BKW	After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed	GBK	After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized	NBK	The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.