Description
DIN 17175 Seamless Steel Tubes
DIN 17175 is a German standard specification for seamless steel tubes used in elevated temperature service, primarily in boilers, superheaters, pipelines, and pressure vessels.
Key Features of DIN 17175
- Material Type: Seamless carbon steel pipe
- Standard: DIN 17175
- Grade: ST35.8 (also referred to as 1.0305)
- Delivery Condition: Usually supplied in normalized condition
Common Grades in DIN 17175
| Grade | Equivalent | Description |
|---|---|---|
| St35.8 | A179 | Low carbon steel, good weldability |
| St45.8 | A106 Gr B | Medium carbon steel, higher strength |
| 15Mo3 | – | Alloy steel with molybdenum, good heat resistance |
| 13CrMo44 | A335 P11 | Chromium-molybdenum alloy, excellent at 560°C+ |
| 10CrMo910 | A335 P22 | Higher alloy content for long-term heat exposure |
Chemical Composition
| Grade | C | Si | Mn | P (max) | S (max) | Mo | Cr |
|---|---|---|---|---|---|---|---|
| St35.8 | ≤ 0.17 | ≤ 0.35 | 0.40–0.80 | 0.035 | 0.035 | – | – |
| St45.8 | ≤ 0.21 | ≤ 0.35 | 0.40–1.00 | 0.035 | 0.035 | – | – |
| 15Mo3 | 0.12–0.20 | 0.35–0.75 | 0.40–0.90 | 0.025 | 0.020 | 0.25–0.35 | – |
| 13CrMo44 | 0.17–0.24 | 0.30–0.60 | 0.40–0.70 | 0.035 | 0.035 | 0.45–0.65 | 0.70–1.15 |
| 10CrMo910 | 0.08–0.18 | 0.15–0.50 | 0.30–0.60 | 0.025 | 0.010 | 0.85–1.15 | 2.00–2.50 |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| St35.8 | 360 – 480 | ≥ 235 | ≥ 25 |
| St45.8 | 440 – 590 | ≥ 275 | ≥ 21 |
| 15Mo3 | 450 – 600 | ≥ 280 | ≥ 22 |
| 13CrMo44 | 440 – 590 | ≥ 290 | ≥ 21 |
| 10CrMo910 | 500 – 650 | ≥ 280 | ≥ 20 |
Application
- Boiler Tubes
- Heat Exchangers
- Superheaters & Reheaters
- Petrochemical & Refinery Plants
- Power Generation Plants
- Pressure Vessels
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