DIN 17175 Heat-resistant seamless carbon steel pipe. Applications: High-temperature, high-pressure conditions (boilers, superheaters, steam pipes, pressure vessels, petrochemical heat exchangers). Maximum operating temperature: ≤550℃ (St35.8/St45.8); ≤600℃ (17Mn4). Mainstream materials: St35.8, St45.8, 17Mn4 (all carbon steel/low-alloy heat-resistant steel). 

Material descriptions:

St35.8 (1.0305): Low-carbon heat-resistant steel, C≤0.17%, strong high-temperature stability, creep resistance. Excellent weldability, good cold/hot working performance.

Applications: ≤450℃, medium-pressure boilers, steam, hot oil, heat exchangers.

St45.8 (1.0405): Medium-carbon manganese-based heat-resistant steel, C≤0.21%, higher high-temperature strength than St35.8. High pressure resistance, fatigue resistance, and hydrogen erosion resistance.

Applications: ≤500℃, high-pressure boilers, power plant main steam, pressure vessels.

17Mn4 (1.0481): High-manganese low-alloy heat-resistant steel, Mn=1.0~1.5%, excellent high-temperature creep strength. High strength, high toughness, stable long-term high-temperature service.

Applications: ≤550~600℃, ultra-high-pressure boilers, petrochemical high-temperature pipelines, steam turbines.

Product Advantages

DIN 17175 is a mandatory standard for boilers and pressure vessels in Germany/EU, CE and TÜV approved.

Suitable for high-temperature and high-pressure projects in Europe, the Middle East, Southeast Asia, South America, and Africa. Replaces ASTM A106/ASME SA106 and EN 10216-2, offering strong interchangeability.

Specifically designed for high-temperature and high-pressure applications, ensuring stable performance. Maintains high strength, creep resistance, and fatigue resistance at temperatures ≤600℃, preventing embrittlement during long-term service. Low P and low S (P≤0.035%, S≤0.030%), high purity, and few internal defects. 17Mn4 high-manganese strengthening, increasing high-temperature strength by 30%+ compared to ordinary carbon steel. Excellent welding and processing performance. Low carbon/low alloy design, low carbon equivalent, reducing the risk of cold cracking during welding. Suitable for manual arc welding, TIG welding, and submerged arc welding; no complex preheating is required for conventional processes. Easy to bend, drill, and heat treat, resulting in high on-site installation efficiency.

Chemical composition (mass fraction %)

Mechanical properties

Statistics on the popular models and common specifications of carbon steel pipes

Select materials based on application

For general fluid transportation (water, gas, oil): 20#, Q235B, A53 Gr.B, STPG370

The best cost-performance ratio, globally applicable

For high-temperature / steam / boiler pipes: A106 Gr.B, 20G, 15CrMoG, P235TR1/P235GH

Better resistance to high temperature and pressure

For oil and gas pipelines: API 5L Gr.B, X42, X52, X60

High strength and good toughness, suitable for long-distance pipelines

For low-temperature environments (cold storage, LNG support): A333 Gr.1/Gr.3, 16MnDG

Resistant to low temperature without cracking

For structural pipes (supports, machinery, steel structures): Q355B (old 16Mn), St44.2, A36

High strength and good load-bearing capacity