DIN 17175 Seamless Heat-Resistant Steel Tube
For Boiler, Superheater, and High Temperature Service
Grades St35.8, St45.8, 15Mo3, 13CrMo44, 10CrMo910
German Standard – Withdrawn, Replaced by EN 10216-2 – Supplied for Legacy Projects
Product Overview
DIN 17175 is the German standard for seamless heat-resistant steel tubes intended for boilers, superheaters, heat exchangers, and high temperature pressure systems. These tubes offer excellent creep strength and oxidation resistance for elevated temperature service up to 600°C .
Key Characteristics:
Heat-Resistant Definition:
Steels that maintain good mechanical properties under long-term stress at high temperatures up to 600°C .
Steel Grades Covered:
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St35.8 – Carbon steel for general boiler service (EN 10216-2: P235GH)
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St45.8 – Carbon steel for higher strength boiler service (EN 10216-2: P265GH)
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15Mo3 – Molybdenum alloy steel for medium temperature service (EN 10216-2: 16Mo3)
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13CrMo44 – 1% Chrome-0.5% Molybdenum for high temperature service (EN 10216-2: 13CrMo4-5)
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10CrMo910 – 2.25% Chrome-1% Molybdenum for advanced high temperature (EN 10216-2: 10CrMo9-10)
⚠️ Important Note: DIN 17175 has been withdrawn and replaced by EN 10216-2 . However, we continue to supply material to DIN 17175 specifications for legacy replacement, maintenance, and retrofit projects where the old standard is still specified .
✅ DIN 17175 compliant – Supplied to withdrawn standard for legacy projects
✅ Seamless construction – Safe for high pressure/temperature
✅ Heat-resistant grades – Good mechanical properties at high temperatures
✅ Full range of grades – St35.8, St45.8, 15Mo3, 13CrMo44, 10CrMo910
✅ Proper heat treatment – Normalized, subcritical annealed, or quenched and tempered
✅ 100% NDT tested – Ultrasonic or eddy current
✅ EN 10204 Type 3.1 MTC provided with full traceability
✅ Factory direct | Fast delivery
Key Specifications
| Parameter | Details |
|---|---|
| Standard | DIN 17175-1979 (withdrawn, replaced by EN 10216-2) |
| Product Type | Seamless Heat-Resistant Steel Tube |
| Application | Boilers, Superheaters, Pressure Vessels, High Temp Piping |
| Grades | St35.8, St45.8, 15Mo3, 13CrMo44, 10CrMo910 |
| Size Range | 10mm – 610mm OD (hot rolled); 10mm – 108mm OD (cold drawn) |
| Wall Thickness | 1.5mm – 50mm+ |
| Length | 4m – 12m (fixed or random) |
| Surface Finish | Black / Bare / Oiled |
| End Finish | Plain / Beveled / Threaded |
📌 Heat treatment: Tubes shall be appropriately heat treated over their entire length. Depending on steel type, treatments include normalizing, subcritical annealing, quenching and tempering, or isothermal transformation hardening and tempering .
Steel Grade Cross-Reference
| DIN 17175 Grade | EN 10216-2 Equivalent | ASTM Equivalent | GB Equivalent | Type |
|---|---|---|---|---|
| St35.8 | P235GH | A106 Grade B | 20G | Carbon steel |
| St45.8 | P265GH | A106 Grade C | 25MnG | Carbon steel (higher strength) |
| 15Mo3 | 16Mo3 | A209 T1 | 15MoG | Molybdenum alloy |
| 13CrMo44 | 13CrMo4-5 | A213 T12 | 15CrMoG | 1% Chrome-0.5% Molybdenum |
| 10CrMo910 | 10CrMo9-10 | A213 T22 | 10CrMo910 | 2.25% Chrome-1% Molybdenum |
💡 For new projects, we recommend specifying EN 10216-2 equivalents .
Grade Selection Guide – Temperature & Application
| Grade | Type | Max Temp (°C) | Typical Application |
|---|---|---|---|
| St35.8 | Carbon steel | 400-450 | General boiler service, economizers |
| St45.8 | Carbon steel (high strength) | 400-450 | Higher strength boiler tubes |
| 15Mo3 | Molybdenum alloy | 450-500 | Medium temperature service |
| 13CrMo44 | 1% Chrome-0.5% Molybdenum | 500-550 | High temperature service – most popular |
| 10CrMo910 | 2.25% Chrome-1% Molybdenum | 550-600 | Advanced high temperature service |
Chemical Composition – DIN 17175 Grades
| 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 |
Mechanical Properties – DIN 17175 Grades
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| St35.8 | 360 – 480 | ≥235 | ≥25 |
| St45.8 | 410 – 530 | ≥255 | ≥21 |
| 15Mo3 | 450 – 600 | ≥270 | ≥20 |
| 13CrMo44 | 440 – 590 | ≥290 | ≥20 |
| 10CrMo910 | 450 – 600 | ≥280 | ≥18 |
Elevated Temperature Capability
| Grade | Recommended Max Temp | Creep Resistance | Limitation |
|---|---|---|---|
| St35.8 / St45.8 | Up to 450°C | Limited | — |
| 15Mo3 | Up to 510°C | Good (Mo addition) | Graphitization tendency >510°C |
| 13CrMo44 | Up to 550°C | Excellent (Cr-Mo) | — |
| 10CrMo910 | Up to 600°C | Superior (higher Cr-Mo) | — |
⚠️ 15Mo3 Limitation: This steel tends toward graphitization during long-term operation at high temperatures. Therefore, its operating temperature should be controlled below 510°C .
Available Sizes – DIN 17175 Tubes
| OD (mm) | WT (mm) | Typical Grade | Application |
|---|---|---|---|
| 21.3 – 60.3 | 2.0 – 8.0 | St35.8, St45.8 | Small boiler tubes |
| 60.3 – 114.3 | 3.0 – 12.0 | St35.8, 13CrMo44 | General boiler |
| 114.3 – 219.1 | 5.0 – 20.0 | 13CrMo44, 10CrMo910 | Main steam – most common |
| 219.1 – 325.0 | 6.0 – 30.0 | 10CrMo910 | Headers, large tubes |
| 325.0 – 426.0 | 8.0 – 40.0 | 10CrMo910 | Superlarge headers |
| 426.0 – 610.0 | 10.0 – 50.0 | By agreement | Special applications |
💡 Most popular sizes: 114.3mm, 168.3mm, 219.1mm OD – 13CrMo44 .
Applications – DIN 17175 Tubes
| 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 |
| Refineries | Heat exchanger tubes | 13CrMo44 |
| Legacy Projects | Replacement/retrofit for existing plants | All grades |
Quality Assurance & Testing
| Test | Method | Coverage | Importance |
|---|---|---|---|
| Ultrasonic Testing (UT) | Non-destructive | 100% | Internal defect detection |
| Hydrostatic Test | Water pressure | 100% | Pressure integrity |
| Tensile Test | ASTM E8 | Per heat | Strength verification |
| Hardness Test | Brinell/Rockwell | Per lot | Grade control |
| Flattening Test | Ductility | Per lot | Formability |
| Dimensional Inspection | Micrometer | 100% | Size verification |
Mill Test Certificate
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DIN 17175 Certificate of Compliance – Supplied to original standard
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EN 10204 Type 3.1 MTC – Provided with heat number
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EN 10204 Type 3.2 – Available upon request (third-party: SGS, BV, TUV)
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Heat treatment records – Normalizing temperatures and methods
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Mechanical test reports – Tensile, flattening results
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NDT reports – 100% UT results
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Traceability: Full traceability from melt to finished tube
Why Choose Our DIN 17175 Tubes?
| Advantage | Description |
|---|---|
| Legacy standard specialist | We supply DIN 17175 material for old project replacement |
| Full grade range | St35.8, St45.8, 15Mo3, 13CrMo44, 10CrMo910 – one-stop sourcing |
| EN 10216-2 equivalents available | Also supply current standard when needed |
| 13CrMo44 in stock | Most popular alloy grade – ready to ship |
| Full traceability | EN 10204 3.1 MTC with heat number |
| 100% UT tested | Guaranteed internal integrity |
| Proper heat treatment | Normalized and tempered as required |
| Global export | Shipped to power plants and refineries worldwide |
Contact for Quote
Please provide the following details:
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Grade : St35.8 / St45.8 / 15Mo3 / 13CrMo44 / 10CrMo910
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OD (mm) : _______
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WT (mm) : _______
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Length (m) : _______
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Quantity : _______ (pieces / meters / tons)
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Application : Boiler / Superheater / Replacement / Other _______
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Service Temperature : _______ °C
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End Finish : Plain / Beveled
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Inspection : Standard / Third-party (SGS/BV/TUV)
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: www.wuxihengzhihui.com
Reply within 24 hours.
FAQ – DIN 17175 Tubes
Q1: Is DIN 17175 still active?
A: No – DIN 17175 has been withdrawn and replaced by EN 10216-2 . We supply to this standard for legacy replacement projects.
Q2: What is the equivalent of St35.8 in EN 10216-2?
A: P235GH – the direct replacement grade with equivalent properties.
Q3: What is the equivalent of 13CrMo44 in EN 10216-2?
A: 13CrMo4-5 – the current European standard grade.
Q4: What is the maximum operating temperature for 15Mo3?
A: 510°C (950°F) . Above this temperature, the steel has a tendency toward graphitization.
Q5: What is the most popular grade for high temperature boilers?
A: 13CrMo44 – 1% Chrome-0.5% Molybdenum, suitable for service up to 550°C.
Q6: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, or any customer-specified agency.
Q7: Do you offer free samples?
A: 30cm sample of 13CrMo44 available. Shipping fee applies.
Q8: Can you supply EN 10216-2 equivalents?
A: Yes – we also supply the current EN 10216-2 standard. Please specify which standard you require.
Related Products
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DIN 17175 – Heat-resistant tubes (this product – legacy standard)
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EN 10216-2 – Current European standard (P235GH, 16Mo3, 13CrMo4-5, 10CrMo9-10)
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ASTM A192 – High pressure boiler tubes
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ASTM A213 – Seamless alloy steel boiler tubes
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ASTM A335 – Seamless ferritic alloy steel pipe
Tags: DIN 17175 Heat-Resistant Steel Tube Seamless Boiler Tube St35.8 13CrMo44 10CrMo910 German Standard Boiler Tube High Temperature Tube
