Home > Seamless Pipe > DIN 17175
Inox Steel India is a leading manufacturer and exporter of DIN 17175 Seamless Boiler Tubes in grades ST35.8 and ST45.8. These pipes are designed for high-temperature and high-pressure boiler applications, including superheaters, heat exchangers, economizers, refinery furnaces, power plant boilers, and petrochemical heaters.
DIN 17175 is the German boiler tube standard and one of the most trusted materials globally for power & refinery projects. These grades provide excellent creep resistance, pressure strength, heat stability, weldability, and long service life.
Our tubes are produced through hot-finished / cold-drawn methods, followed by normalizing heat treatment, ensuring correct grain structure and high-temperature stability. Every batch undergoes hydro testing, UT/ECT NDT, spectro testing, dimensional checks, and hardness testing, guaranteeing complete compliance with DIN standards.
DIN 17175 covers seamless steel tubes used for:
These tubes are engineered to withstand:
The materials are normalized (N) to enhance temperature resistance and ductility.
All tubes meet DIN 17175 specifications and international boiler safety requirements.
| Feature | ST35.8 | ST45.8 |
|---|---|---|
| Strength | Medium | Higher |
| Temperature Suitability | Up to 400°C | Up to 500°C |
| Pressure Rating | Standard | High |
| Carbon Content | Lower | Higher |
| Usage | General boilers & heat exchangers | High-pressure boilers & superheaters |
| Parameter / Property | ST35.8 | ST45.8 |
|---|---|---|
| Standard | DIN 17175 | DIN 17175 |
| Material Type | Non-Alloy Carbon Steel | Non-Alloy Carbon Steel |
| Common Use | Boiler, Superheater, Heat Exchanger Tubes | Boiler, Superheater, Heat Exchanger Tubes |
| Min Yield Strength (MPa) | 235 | 255 |
| Min Tensile Strength (MPa) | 360–480 | 410–530 |
| Elongation (%) | 25 | 22 |
| Maximum Carbon (C) | 0.17% | 0.21% |
| Manganese (Mn) | 0.40–0.80% | 0.50–1.10% |
| Phosphorus (P) | ≤ 0.025% | ≤ 0.025% |
| Sulphur (S) | ≤ 0.020% | ≤ 0.020% |
| Delivery Condition | Normalized (N) | Normalized (N) |
| Temperature Suitability | Up to 400°C | Up to 500°C |
| Product Form | Seamless | Seamless |
| Available OD Range | 10.2 mm – 711 mm | 10.2 mm – 711 mm |
| Wall Thickness Range | 1.6 mm – 60 mm | 1.6 mm – 60 mm |
| End Conditions | Plain / Bevelled | Plain / Bevelled |
| Surface Condition | Black / Oiled / Varnished | Black / Oiled / Varnished |
| Impact Test | 27 J (Optional) | 27 J (Optional) |
| Equivalent EN Grade | P235GH | P265GH |
| HSN Code | 730419 | 730419 |
| Certificates Provided | EN 10204 3.1 / 3.2 | EN 10204 3.1 / 3.2 |
India:
Used in major boiler & refinery projects:
Middle East:
Used for:
Europe & Asia:
Heavy requirement in:
Africa:
Used for:
Inox Steel India exports DIN 17175 boiler tubes to GCC, Europe, Africa, and Southeast Asia with full EN/DIN certification.
DIN 17175 ST35.8 & ST45.8 pipes supplied by Inox Steel India are high-temperature pressure tubes designed for boilers, heaters, heat exchangers, economizers, and refinery process coils.
They are mandatory normalized, ensuring excellent resistance to creep, pressure, and fluctuating temperatures.
Applications by Grade / Type / Pressure / Industry
ST35.8 — Standard Boiler Grade Steel (Normalized +N)
Service Use:
Medium-pressure and medium-temperature boiler applications.
Typical Applications:
Temperature Range:
Up to 400°C
Industries Served:
Power | Chemical | Mechanical | Process Heating | Manufacturing
ST45.8 — Higher Strength Boiler Steel (Normalized +N)
Service Use:
High-pressure, high-temperature boiler & superheater applications.
Typical Applications:
Temperature Range:
Up to 500°C
Industries Served:
Power | Refinery | Petrochemical | Fertilizer | Process Engineering
| OD (mm) | WT (mm) | Approx. Weight (kg/m) |
|---|---|---|
| 21.3 | 2.0 | 1.34 |
| 25.4 | 2.8 | 1.90 |
| 33.7 | 3.2 | 2.88 |
| 38.0 | 3.6 | 3.52 |
| 42.4 | 4.0 | 4.24 |
| 48.3 | 4.5 | 5.44 |
| 60.3 | 5.0 | 7.70 |
| 76.1 | 6.3 | 13.00 |
| 88.9 | 7.1 | 17.60 |
| 114.3 | 8.0 | 25.60 |
| 168.3 | 10.0 | 44.60 |
| 219.1 | 12.5 | 67.50 |
| 273.0 | 14.2 | 94.00 |
| Grade / Type | INR/kg | USD/kg | Condition |
|---|---|---|---|
| ST35.8 Seamless | ₹ 110 – ₹ 140 | $1.50 – $1.90 | Normalized |
| ST35.8 CDS Precision | ₹ 145 – ₹ 180 | $1.95 – $2.35 | Cold Drawn |
| ST45.8 Seamless | ₹ 130 – ₹ 175 | $1.80 – $2.35 | Normalized |
| ST45.8 Heavy Wall | ₹ 150 – ₹ 200 | $2.10 – $2.70 | HFS / N |
| Boiler Tube Grade ST45.8 | ₹ 160 – ₹ 220 | $2.30 – $3.00 | Certified Boiler Quality |
✔ HSN 730419 — Seamless Carbon Steel Pressure Pipes
✔ HSN 730429 — Precision Seamless Tubes (Cold Drawn)
DIN 17175 boiler tubes demand strict metallurgical control because they operate in continuous high-temperature pressure environments.
Mandatory Tests
Non-Destructive Testing (NDT)
Chemical & Structural Tests
Documentation Provided
Inox Steel India is a trusted manufacturer, stockist, and global exporter of DIN 17175 Boiler Tubes, delivering high-quality ST35.8 and ST45.8 seamless pipes used in boilers, superheaters, heat exchangers, power plants, refinery heaters, and petrochemical process units.
Our material is supplied in mandatory Normalized (+N) condition, ensuring high-temperature stability, strength, and resistance to creep and pressure fluctuations.
All tubes undergo strict dimensional control, NDT, mechanical testing, and heat treatment verification as per DIN standards.
Top Reasons to Choose Inox Steel India
Inox Steel India ensures long-life and high-strength boiler tubes for the most demanding thermal applications.
| Industry | Application | Preferred Grade |
|---|---|---|
| Power Plants | Boilers, superheaters | ST45.8 |
| Refineries | Heater coils, reformer tubes | ST45.8 |
| Petrochemical | Heat exchangers | ST35.8 / ST45.8 |
| Fertilizer Units | Pressure pipelines | ST45.8 |
| Chemical Plants | High-temp process lines | ST35.8 |
| Boiler OEMs | Economizers, air pre-heaters | ST35.8 |
| Fabricators | High-pressure piping | ST45.8 |
DIN 17175 boiler tubes require robust packing due to their high-precision usage in thermal & pressure systems.
🌍 Major Export Destinations:
UAE • Saudi Arabia • Qatar • Oman • Kuwait • Bahrain
Germany • Italy • Poland • Netherlands • Spain
Egypt • South Africa • Kenya • Nigeria
Malaysia • Indonesia • Thailand • Vietnam
Looking for a DIN 17175 ST35.8 or ST45.8 boiler tube supplier near Alankar Cinema, Mumbai?
Inox Steel India is your reliable and ready-stock solution.
We offer:
Trusted by boiler OEMs, EPC contractors, refinery maintenance teams, and power plant operators.
Get material advice, technical selection, MTC samples, NDT reports & competitive quotes within 24 hours.
📥 Downloadable Resources:
Datasheet • Price List • Heat Treatment Chart • Test Certificates • Size Chart (PDF)
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in
+91 9930796690
Inox Steel India
Email
Phone
Yes — DIN 17175 requires mandatory normalizing, supplied in +N condition.
Boilers, superheaters, heat exchangers, power plants, refineries, and petrochemical industries.
Hydro, UT, ECT, tensile, hardness, chemical composition, dimensional checks.
Yes — all materials include MTC + test reports.
HSN 730419 — seamless carbon steel pressure pipes.
Yes — regular shipments to GCC, Europe, Africa & Southeast Asia.
Inox Steel India supplies premium DIN 17175 ST35.8 / ST45.8 Seamless Boiler & Heat-Exchanger Pipes for high-pressure & high-temperature industrial applications.