Attention: The DIN 17175 standard has been officially withdrawn and replaced by the current European standard EN 10216-2.
Technical Regulations and Scope of Application
This standard specifies the technical delivery conditions for seamless tubes, including collector system elements, made of heat-resistant steel grades listed in the table below. Products complying with these requirements are intended for use in steam generating plants, high-temperature pipeline systems, and pressure vessels. The maximum operating temperature is 600 °C; however, the actual limit is determined by a combination of factors: mechanical load intensity, internal pressure, and the degree of exposure to oxidizing environments.
In the context of this standard, “heat-resistant steels” refers to alloys that maintain stable physical and mechanical properties, including creep resistance, during prolonged operation under high-temperature conditions.
Chemical Composition of Heat-Resistant Steels
| Steel | WNr | C | Si | Mn | P | S | Cr | Mo | Ni | V |
|---|---|---|---|---|---|---|---|---|---|---|
| St 35.8 | 1.0305 | <0,17 | 0,10-0,35 | 0,40-0,80 | 0,040 | 0,040 | – | – | – | – |
| St 45.8 | 1.0405 | <0,21 | 0,10-0,35 | 0,40-1,20 | 0,040 | 0,040 | – | – | – | – |
| 17 Mn 4 | 1.0481 | 0,14-0,20 | 0,20-0,40 | 0,90-1,20 | 0,040 | 0,040 | <0,30 | – | – | – |
| 19 Mn 5 | 1.0482 | 0,17-0,22 | 0,30-0,60 | 1,00-1,30 | 0,040 | 0,040 | <0,30 | – | – | – |
| 15 Mo 3 | 1.5415 | 0,12-0,20 | 0,10-0,35 | 0,40-0,80 | 0,035 | 0,035 | – | 0,25-0,35 | – | – |
| 13 CrMo 4 4 | 1.7335 | 0,10-0,18 | 0,10-0,35 | 0,40-0,70 | 0,035 | 0,035 | 0,70-1,10 | 0,45-0,65 | – | – |
| 10 CrMo 9 10 | 1.7380 | 0,08-0,15 | <0,50 | 0,40-0,70 | 0,035 | 0,035 | 2,00-2,50 | 0,90-1,20 | – | – |
| 14 MoV 6 3 | 1.7715 | 0,10-0,18 | 0,10-0,35 | 0,40-0,70 | 0,035 | 0,035 | 0,30-0,60 | 0,50-0,70 | – | 0.22-0.32 |
| X 20 CrMoV 12 1 | 1.4922 | 0,17-0,23 | <0,50 | <1,00 | 0,030 | 0,030 | 10,00-12,50 | 0,80-1,20 | 0,30-0,80 | 0.25-0.35 |