DIN 17175 heat-resistant seamless tubes are German-standardized steel pipes designed to withstand high temperatures (450°C–650°C). They are primarily used in boiler economizers, superheaters, reheaters, and pipeline systems for the petrochemical industry. Key material grades under DIN 17175 include St35.8, 15Mo3, and 13CrMo44.
Chemical Compositions of DIN 17175 steel pipes (%)
| Grade | C | Si | Mn | P | S | Cr | Mo |
| St35.8 | ≤0.17 | 0.10-0.35 | 0.40-0.80 | ≤0.040 | ≤0.040 | / | / |
| St45.8 | ≤0.21 | 0.10-0.35 | 0.40-1.20 | ≤0.040 | ≤0.040 | / | / |
| 15Mo3 | 0.12-0.20 | 0.10-0.35 | 0.40-0.80 | ≤0.035 | ≤0.035 | / | 0.25-0.35 |
| 13CrMo44 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | ≤0.035 | ≤0.035 | 0.70-1.10 | 0.46-0.65 |
| 10CrMo910 | 0.08-0.15 | ≤0.50 | 0.40-0.70 | ≤0.035 | ≤0.035 | 0.20-0.25 | 0.90-1.20 |
Mechanical Properties of DIN17175 steel pipe
| Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation(%) |
| St35.8 | ≥235 | 360-480 | 25 |
| St45.8 | ≥255 | 410-530 | 21 |
| 15Mo3 | ≥275 | 450-600 | 20 |
| 13CrMo44 | ≥290 | 440-590 | 20 |
| 10CrMo910 | ≥280 | 450-600 | 18 |
DIN17175 vs ASTM A513 Key Differences Comparison
| Feature | DIN 17175 (German Std) | ASTM A513 (US Std) |
|---|---|---|
| Primary Use | High-temp/pressure pipes (450-650°C) | Structural welded tubes (low pressure) |
| Manufacturing | Seamless | ERW (Electric Resistance Welded) |
| Material Types | Heat-resistant alloys (e.g., 15Mo3, 13CrMo44) | Carbon/alloy steels (e.g., 1018, 4140) |
| Key Properties | Creep strength, oxidation resistance | Cold formability, machinability |
| Applications | Boilers, petrochemical pipelines | Automotive frames, machinery parts |
Applications
Power Plant Boiler Critical Components
Economizers: Preheats feed water using flue gas waste heat (≤450°C)
Superheaters: Heats saturated steam to high temperatures (450-650°C); requires creep-resistant alloys (e.g., 15Mo3)
Reheaters: Reheats turbine exhaust steam; 13CrMo44 preferred for high-pressure/temperature conditions
Petrochemical & Energy Systems
High-temperature pipelines in cracking/reforming units (resists 650°C hydrogen corrosion)
Heat exchanger tube bundles (requires pressure + sulfur corrosion resistance)
Specialized Industries
Nuclear auxiliary steam systems (requires nuclear-certified variants)
Coke oven gas pipelines (resists thermal fatigue)
Test and inspection
Packaging and shipping
