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Help CenterDIN 17175 Seamless Heat-Resistant Steel Tube-Hengzhihui For Boiler & Superheater Service – St35.8, St45.8, 13CrMo44, 10CrMo910 Cold Drawn
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DIN 17175 Seamless Heat-Resistant Steel Tube-Hengzhihui
For Boiler & Superheater Service – St35.8, St45.8, 13CrMo44, 10CrMo910
OD 6~204mm | WT 1~18mm | Cold Drawn
Product Overview
Our DIN 17175 seamless heat-resistant steel tubes are manufactured to the German standard for boiler, superheater, and high temperature service. These tubes offer excellent creep strength and oxidation resistance at elevated temperatures up to 600°C.
⚠️ Important Note: DIN 17175 has been withdrawn and replaced by EN 10216-2. We supply this standard for legacy replacement, maintenance, and retrofit projects where the old German standard is still specified .
Key Specifications:
Standard: DIN 17175-1979 (withdrawn – replaced by EN 10216-2)
Grades: St35.8, St45.8, 15Mo3, 13CrMo44 (most popular) , 10CrMo910
Outer Diameter: 6mm – 204mm (Standard Stock: 19mm – 89mm)
Wall Thickness: 1mm – 18mm
Length: 4m – 12m (Custom lengths available)
Manufacturing Process: Cold Drawn (Seamless)
Heat Treatment: Normalized or Normalized + Tempered
Surface Finish: Black / Bare / Oiled
✅ DIN 17175 compliant – Supplied to withdrawn standard for legacy projects
✅ Seamless cold drawn – No weld seam – safe for high pressure/temperature
✅ Heat-resistant grades – Good mechanical properties under long-term stress
✅ 13CrMo44 in stock – Most popular alloy grade for high temperature boilers
✅ 100% NDT and hydrostatic tested – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC provided with heat number
✅ Factory direct – Competitive pricing and fast delivery
Grade Cross-Reference
| DIN 17175 | EN 10216-2 | ASTM | GB | Type | Max Temp |
|---|---|---|---|---|---|
| St35.8 | P235GH | A106 Gr.B | 20G | Carbon steel | 450°C |
| St45.8 | P265GH | A106 Gr.C | 25MnG | Carbon steel (higher strength) | 450°C |
| 15Mo3 | 16Mo3 | A209 T1 | 15MoG | Molybdenum alloy | 500°C |
| 13CrMo44 | 13CrMo4-5 | A213 T12 | 15CrMoG | 1% Cr-0.5% Mo | 550°C |
| 10CrMo910 | 10CrMo9-10 | A213 T22 | 10CrMo910 | 2.25% Cr-1% Mo | 580°C |
💡 13CrMo44 is the most popular alloy grade for high temperature boiler service under DIN 17175 .
Chemical Composition
| Grade | C | Si | Mn | P max | S max | Cr | Mo |
|---|---|---|---|---|---|---|---|
| St35.8 | ≤0.17 | 0.10-0.35 | 0.40-0.80 | 0.030 | 0.030 | — | — |
| St45.8 | ≤0.21 | 0.10-0.35 | 0.40-1.20 | 0.030 | 0.030 | — | — |
| 15Mo3 | 0.12-0.20 | 0.10-0.35 | 0.40-0.80 | 0.030 | 0.030 | — | 0.25-0.35 |
| 13CrMo44 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | 0.030 | 0.030 | 0.70-1.10 | 0.45-0.65 |
| 10CrMo910 | 0.08-0.15 | ≤0.50 | 0.40-0.70 | 0.030 | 0.030 | 2.00-2.50 | 0.90-1.20 |
💡 Chromium provides oxidation resistance – Molybdenum provides high-temperature creep strength .
Mechanical Properties
| Grade | Tensile (MPa) | Yield (MPa) | Elongation (%) | Max Temp |
|---|---|---|---|---|
| St35.8 | 360-480 | ≥235 | ≥25 | 450°C |
| St45.8 | 410-530 | ≥255 | ≥21 | 450°C |
| 15Mo3 | 450-600 | ≥270 | ≥20 | 500°C |
| 13CrMo44 | 440-590 | ≥290 | ≥20 | 550°C |
| 10CrMo910 | 450-600 | ≥280 | ≥18 | 580°C |
Manufacturing Process – Cold Drawing
Cold Drawing Process for Heat-Resistant Tubes:
Hot rolled tubes are pickled to remove scale
Cold drawing precisely reduces the diameter
Heat treatment – Normalized (carbon grades) / Normalized + Tempered (alloy grades)
Straightening – ensures straightness for boiler installation
Precision cutting – to exact customer length
100% NDT and hydrostatic testing – guarantees integrity
15Mo3 Limitation – Graphitization
⚠️ Important: 15Mo3 has a tendency toward graphitization during long-term operation at high temperatures. Its operating temperature should be controlled below 510°C to prevent this phenomenon. The addition of aluminum during smelting should be limited to control and delay the graphitization process .
Key Applications – Legacy Replacement
| Industry | Application | Recommended Grade |
|---|---|---|
| Power Generation | Boilers, superheaters, reheaters | St35.8, 13CrMo44 |
| Industrial Boilers | Water tubes, economizers | St35.8, St45.8 |
| Pressure Vessels | High temperature pressure parts | 13CrMo44, 10CrMo910 |
| Petrochemical | High temperature process piping | 10CrMo910 |
| Legacy Projects | Replacement/retrofit for existing plants | All grades |
💡 DIN 17175 is primarily supplied for legacy replacement projects – for new builds, EN 10216-2 is recommended .
Why Choose Our DIN 17175 Tubes?
| Advantage | Description |
|---|---|
| Legacy standard specialist | We supply withdrawn DIN 17175 for old project replacement |
| Full grade range | St35.8 to 10CrMo910 – one-stop sourcing |
| 13CrMo44 in stock | Most popular alloy grade – ready to ship |
| EN equivalents available | Also supply EN 10216-2 when needed |
| 100% tested | NDT + hydrostatic – guaranteed integrity |
| Full traceability | EN 10204 3.1 MTC with heat number |
Contact for Quote
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: /
Contact Person: Alice Yuan
Reply within 24 hours.
Tags: DIN 17175 Heat-Resistant Steel Tube St35.8 13CrMo44 10CrMo910 Seamless Boiler Tube German Standard
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