310 Stainless Steel Fittings – The Ultimate High-Temperature Solution for 1150 °C Continuous Service
When your piping system must survive continuous exposure above 800 °C, only 310 Stainless Steel Fittings deliver the reliability you need. With 25 % chromium and 20 % nickel, this austenitic grade forms a tenacious oxide scale that resists spalling even under cyclic thermal shock. Whether you are building furnace radiant tubes, petrochemical crackers, or power-station superheaters, 310 Stainless Steel Fittings offer creep-rupture strength to 1150 °C – far outperforming 304, 321, or 309. The high nickel content maintains austenitic stability, while chromium provides exceptional oxidation and sulfidation resistance, making 310 stainless steel pipe fittings the first choice for the world’s most aggressive high-temperature environments.
310 Stainless Steel Fittings – Seamless Butt-Weld Fittings for Continuous 1150 °C Service
Key Features & Benefits
- 25 Cr / 20 Ni chemistry – maximum scaling resistance in air and oxidizing gases
- Continuous service to 1150 °C; intermittent to 1100 °C with minimal scale growth
- Excellent sulfidation and carburization resistance in petrochemical atmospheres
- Higher creep rupture strength than 304H or 321 above 600 °C
- Good weldability; post-weld anneal not required for most high-temp services
- Available in seamless, welded, and large-diameter fabricated 310 stainless steel pipe fittings
- Full ASTM A182 F310/F310S, A403 WP310/WP310S, ASME B16.9, B16.11, EN 1.4845 compliance
Technical Specifications
Table 1 – Chemical Composition (ASTM A403)
| Element | 310 % | 310S % | 304H % |
|---|---|---|---|
| Cr | 24.0–26.0 | 24.0–26.0 | 18.0–20.0 |
| Ni | 19.0–22.0 | 19.0–22.0 | 8.0–10.5 |
| C (310) | ≤0.25 | ≤0.08 | 0.04–0.10 |
| C (310S) | ≤0.08 | ≤0.08 | — |
| Mn | ≤2.00 | ≤2.00 | ≤2.00 |
| Si | ≤1.50 | ≤1.50 | ≤1.00 |
| Fe | Balance | Balance | Balance |
Table 2 – Mechanical & Elevated-Temperature Properties
| Property | Room Temp. | 800 °C | 1000 °C |
|---|---|---|---|
| Tensile Strength | ≥515 MPa | ≥210 MPa | ≥100 MPa |
| Yield Strength (0.2 %) | ≥205 MPa | ≥120 MPa | ≥60 MPa |
| Elongation in 2" | ≥40 % | ≥25 % | ≥30 % |
| Hardness HRB | ≤95 | — | — |
| Density | 7.9 g/cm³ (0.286 lb/in³) | — | — |
| Thermal Expansion | 15.9 µm/m·K (20–100 °C) | — | — |
Complete Product Range Table
| Fitting Type | Size Range | Pressure Class | Standards | Finish |
|---|---|---|---|---|
| 310 stainless steel fittings – seamless butt-weld | ½"–48" | Sch 5S/10S/40S/80S | ASTM A403 WP310/WP310S, ASME B16.9 | Pickled, 180G |
| 310 stainless steel pipe fittings – welded ERW | 14"–48" | Sch 10S/20/40S | ASTM A403 WP310, ASME B16.9 | Pickled |
| Forged threaded & socket-weld | ¼"–4" | 150 lb / 3000 lb / 6000 lb | ASTM A182 F310/F310S, ASME B16.11 | Pickled |
| Large-diameter fabricated specials | 20"–48" | Custom | ASTM A234 WP310 | Solution-annealed |
| High-temp flange & furnace specials | ½"–48" | Custom | ASTM A182 F310S | Bright annealed |
Custom CNC-machined specials available on request.
Product Focus & Market Info
As one of the world’s largest and most specialized manufacturers of 310 stainless steel pipe fittings, we operate a 180 000 t/year high-temperature alloy forging and CNC finishing line dedicated to 310 stainless steel fittings production. Our 200 000 m² facility keeps 40 000 t of ready stock, ensuring immediate availability for global EPC and furnace builders. Whether you need one pallet of 6" Sch 40S elbows or a full vessel of 36" × 12 m special-radius bends, our mill-direct pricing and TUV-certified quality give you the competitive edge. Contact our export team today for the most updated quotation and downloadable 3.1 MTC.
Specialty products include custom 310 stainless steel pipe fittings for aviation exhaust systems – tight-radius, thin-wall, and bright-annealed finishes.
Premium 310 Stainless Steel Pipe Fittings – Full Traceability, Solution-Annealed, Ready Stock
Main Applications
- Furnace & kiln burner lines, radiant tubes, muffles, baskets
- Power-station superheater connections, reheater supports, EGR piping
- Petrochemical cracking furnaces, thermal oxidizers, flare stacks
- Cement plant preheaters, steel plant recuperators
- 310 stainless steel fittings for large-diameter stacks and ducts
- Afterburners, muffle retorts, high-temperature chemical process lines
Massive Inventory of 310 Stainless Steel Fittings – Mill-Direct Prices, Immediate Delivery Worldwide
Why Choose Us – High-Temp Specialist
- PED 2014/68/EU & TUV certified mill – EN 10204 3.1 & 3.2 MTC supplied
- In-house solution annealing up to 1200 °C – full metallurgical control
- 180 000 tons annual high-temperature alloy capacity – 5-day lead time
- Same-day beveling & NDT – UT, RT, PMI on every 310 stainless steel pipe fitting
- Real-time stock portal – 24/7 visibility for any 310 stainless steel fittings
- Global export to 80+ countries – fumigation-free crates, vessel booking, insurance
Grade Comparison Table: 310/310S vs 309S vs 321 vs 304H vs 253MA vs 800H
| Grade/Type | Cr % | Ni % | Max Temp (°C) | Oxidation Resistance | Relative Cost | Best Use |
|---|---|---|---|---|---|---|
| 310/310S | 25 | 20 | 1150 | Excellent | 1.4× | Furnace radiant tubes |
| 309S | 23 | 13 | 1050 | Very Good | 1.2× | Oven liners |
| 321 | 18 | 10 | 870 | Good | 1.0× | Exhaust |
| 304H | 18 | 8 | 800 | Moderate | 0.9× | Refinery piping |
| 253MA | 21 | 11 | 1150 | Excellent | 1.6× | Burner cones |
| 800H | 20 | 32 | 1000 | Very Good | 2.2× | Ethylene crackers |
FAQ – 310 Stainless Steel Fittings
-
What is the maximum continuous service temperature?
1150 °C in air; intermittent to 1100 °C with minimal scaling. -
Difference between 310 and 310S fittings?
310S is low-carbon (0.08 % max) for better weldability and thermal cycling; strength slightly lower. -
Price vs 304/316 fittings?
310 is ~40 % higher than 304, ~10 % higher than 321; longer life often offsets premium. -
Stock availability for large 310 stainless steel pipe fittings?
40 000 t ready stock; specials fabricated within 7 days. -
Lead time for 36" 310 stainless steel fittings?
5 days for standard; 10 days for custom SAW fabricated specials. -
Which welding procedures are recommended?
TIG with ER310 filler; pre-heat not required; post-weld anneal optional. -
Do you supply solution-annealed 310 stainless steel fittings?
Yes, in-house furnace up to 1200 °C included with every batch. -
Do you export worldwide?
Yes, to 80+ countries including USA, Germany, India, UAE, South Korea, and Brazil.
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Stop paying trader margins. Contact the most trusted 310 stainless steel fittings manufacturer today for the lowest price, immediate access to massive stock, and same-day cutting of any 310 stainless steel pipe fittings.