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DIN 2391 Seamless Precision Steel Tubes in Mechanical And Automotive Engineering
DIN 2391 standard specified that the tubes shall be manufactured by cold form with different heat treatment processing. There are five steel grades in this specification, St30Si, St30Al, St35, St45, St52. Such tubes are applicable in where accuracy to size and, possibly, a small wall thickness, a particular surface condition and specific mechanical properties are required.
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DIN 2391 Seamless Precision Steel Tubes in Mechanical And Automotive Engineering
DIN 2391 standard specified that the tubes are cold form with the technical delivery conditions and manly used in mechanical and automotive engineering. Such tubes are applicable in where accuracy to size and, possibly, a small wall thickness, a particular surface condition and specific mechanical properties are required. The tubes shall be manufactured from electric or basic oxygen steel, the melting and casting processes being at the discretion of the manufacturer. The steel shall be cast as killed steel.
Dimension of DIN 2391 tubes:
Out diameter: 4mm-60mm
Wall thickness:0.25mm-12mm as per client's request.
Length: unless otherwise specified by purchaser at the time of ordering, tubes shall be supplied as random lengths between 4m and 7m.
Tube ends:
Tube ends shall be cut nominally square to the axis and shall be free from excessive burrs, as may result from the cutting process. Agreement regarding the finishing of ends of tubes of exact length is mandatory.
Qulity Grade:
1. For the precision steel tubes,that do not require an inspection certificate and thus are not subject to special requirements, grade A
2. For precision steel tubes subject to special requirements, grade C
In accordance with the stated demands of the purchaser such special requirements and relevant test methods shall be subject to agreement.
Chemical composition of grade A in DIN2391:
Steel grade | C | Si | Mn | P & S |
St30 Si | ≤0.10 | ≤0.30 | ≤0.55 | ≤0.025 |
St 30 Al | ≤0.10 | ≤0.05 | ≤0.55 | ≤0.025 |
St 35 | ≤0.17 | ≤0.35 | ≥0.40 | ≤0.025 |
St 45 | ≤0.17 | ≤0.35 | ≥0.40 | ≤0.025 |
St 52 | ≤0.22 | ≤0.55 | ≤1.60 | ≤0.025 |
The following alloyed elements may be added: Nb≤0.03%,Ti≤0.03%,V≤0.05%,Nb+Ti+V≤0.05% | ||||
Owing to diverse methods of heat treatment, the mechanical properties of tubes are different as per table 5 in DIN 2391 standard.
Test of DIN 2391 tubes:
Tubes to be supplied without inspection document (quality grade A). As part of internal control, the manufacturer shall submit tubes to:
A) a dimensional check.
B) A surface inspection.
C) A tensile test as specified in DIN EN 10002 Part 1.
D) A flattening test, as specified in DIN EN 10233.
E) A drift expanding test, as specified in DIN EN 10234.
F) Flattening and drift expanding tests shall only be carried out on annealed or normalized tubes made of the steel grades if the testing does not adversely affect the tube diameter and wall thickness.
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