DIN 17176 Seamless Circular Steel Tubes for Hydrogen Service at El...

DIN 17176 Seamless Circular Steel Tubes for Hydrogen Service at Elevated Temperatures and Pressures

DIN 17176 Seamless Circular Steel Tubes for Hydrogen Service at Elevated Temperatures and Pressures - technical delivery conditions

1 Field of application
This standard specifies requirements for seamless circular tubes manufactured from the steel grades listed in table 1. Such tubes are mainly intended for use in chemical plants for high pressure applications at service temperatures of 200?C or more and simultaneous exposure to hydrogen(e.g. boiler or heat exchanger tubes).

2 Concept
Steel for hydrogen service at elevated temperature and pres-sure is steel that is not readily susceptible to decarburization by hydrogen at elevated pressures and temperatures and thus to hydrogen and grain boundary embitterment. This characteristic is achieved by adding alloying elements that form carbides at the operating temperature.

3 Steel grades
3.1 The specifications of this standard relate to tubes made from the steel grades listed as below.
Steel Grade Symbols (Material Number)
DIN 17176 Grade 25CrMo4 (1.7218)
DIN 17176 Grade 13CrMo44 (1.7335)
DIN 17176 Grade 10CrMo910 (1.7380)
DIN 17176 Grade 12CrMo910 (1.7375)
DIN 17176 Grade 12CrMo1210 (1.7381)
DIN 17176 Grade 12CrMo195 (1.7362)
DIN 17176 Grade X12CrMo91 (1.7386)
DIN 17176 Grade 20CrMoV135 (1.7779)
DIN 17176 Grade X20CrMoV121 (1.4922)

3.2 The selection of the steel grade is at the purchaser's discretion.

4 Designation and ordering
4.1 Standard designation
The standard designation of tubes covered in this standard shall give, in the following order;
- the name of product (tube);
- the number of this standard (DIN 17 176);
- the characteristic dimensions of the tube (outside diameter × wall thickness);
- the material designation or number denoting the steel grade (cf. table 1);
- the symbol denoting the heat treatment condition, for steel grades 12 CrMo 19 5 and X 12 CrMo 9 1.
Example:
A tube complying with this standard, with an outside diameter of 127 mm and a wall thickness of 28mm, made from steel 12CrMo195 (material number 1.7362), in the annealed condition (G), shall be designated:
Tube DIN 17 176 - 127 X 28 - 12CrMo195
or
Tube DIN 17 176 - 127 X 28 - 1.7362 G

5. The tolerance on dimension in details, please check DIN 17176.

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