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гидростанции, гидроцилиндры, гидравлические компоненты Документация

September 1994

DIN 2394 Part 2

Welded and sized precision steel tubes
Technical delivery conditions

ICS 23.040.10

Supersedes August 1981 edition.

Descriptors: Tube, steel tube, precision tube, technical delivery conditions.

GeschweiBte maBgewalzte Prazisionsstahlrohre; technische Lieferbedingungen

In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker.

Dimensions in mm

1 Scope and field of application

1.1 This standard specifies technical delivery conditions for welded and sized precision steel tubes of the dimensions listed in DIN 2394 Part 1, which are made from the steel grades listed in clause 4.
Such tubes are mainly used where accuracy to size and, possibly, a small wall thickness, a particular surface condition and specific mechanical properties are required.

1.2 This standard does not cover:

  • welded, circular, unalloyed steel tubes subject to special requirements (cf. DIN 1626);
  • high performance welded, circular, unalloyed steel tubes (cf. DIN 1628);
  • welded circular steel tubes for structural steelwork (cf. DIN 17 120);
  • welded circular fine grain steel tubes for structural steelwork (cf. DIN 17123);
  • welded circular tubes made from steels with low temperature toughness (cf. DIN 17174);
  • electric pressure-welded steel tubes with elevated temperature properties (cf. DIN 17177);
  • welded circular fine grain steel tubes subject to special requirements (cf. DIN 17 178);
  • welded circular austenitic stainless steel tubes subject to special requirements (cf. DIN 17 457);
  • teel pipes for conveying combustible liquids and gases (cf. DIN 17172).

Subject to agreement, tubes of dimensions specified, in DIN 2394 Part 1 and in compliance with one of the standards listed above may be ordered in quality grade C.

2 Quality grades

Tubes shall be supplied in the following quality grades: for precision steel tubes, that do not require an inspection certificate and thus are not subject to special requirements, grade A;
for precision steel tubes subject to special requirements, grade C.
In accordance with the stated demands of the purchaser, such special requirements and the relevant test methods shall be subject of agreement. Table 9 lists possible additional requirements (for grade C).

3 Order details and options

The following information shall be supplied by the purchaser:

  • a) the quantity, in metres;
  • b) a reference to this standard;
  • c) the quality grade;
  • d) the steel grade;
  • e) the final supply condition;
  • f) the outside and wall thickness;
  • g) the type of tube length to be supplied;
  • h) any inspection document agreed upon.

Designation for 1 000 m welded precision steel tubes, made of RSt 37-2 steel, welded and sized (BKM), with an outside diameter, D, of 40 mm and a wall thickness, T, of 1,5 mm, in random lengths:

1000 m tube DIN 2394 - RSt 37-2 BKM - 40 x 1,5

Designation for 1 000 m quality grade С welded precision steel tubes, made of RSt 37-2 steel, normalized (NBK), with an out-side diameter, D, of 40 mm and a wall thickness, T, of 1,5 mm, in exact lengths of 4 000 mm, where the interior burr has been removed by cutting (IG):

1000 m tube DIN 2394 - С - IG - RSt 37-2 NBK - 40 x 1,5 X 4000

Designation for 1 000 rn quality grade С welded precision steel tubes, made of St 37.8 steel, normalized (NBK), with an outside diameter, D, of 20 mm and wall thickness, T, of 1,5 mm, in exact lengths of 4 000 mm, produced to the limit deviations specified in DIN 2394 Part 1, complying with the technical delivery conditions specified in DIN 17177 and supplied with type 3.1.В inspec-tion certificate as specified in DIN 50 049:

1000 m tube DIN 2394 - С - 20 x 1,5 x 4000 - DIN 17177 - St 37.8 NBK - 3.1.B

Unless otherwise specified, tubes shall be supplied in quality grade A and in lengths as specified in subclause 9.3.

4 Materials

The tubes shall be manufactured from electric steel or basic oxygen steel, the melting and casting processes being at the discretion of the manufacturer.
The steel shall be cast as killed steel. If a particular deoxidation procedure is requested, this shall be agreed upon at the time of ordering. Table 1 lists relevant steel grades.

Table 1: Steel grades

Quality grade
Steel grade
Previous designation used in Germany
as in DIN EN 10027-1
as in DIN EN 10027-2
A
S205G2T
S235JRG2
S275JR
S355J2G3
1.0034
1.0038
1.0044
1.0570
RSt 34-2
RSt 37-2
St 44-2
St 52-3
C
All grades as for quality grade A, and any other steel grades.

 

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