Stainless Steel 310S Pipe Fittings Manufacturer & Exporter
SS 310S Pipe Fittings are the standard specification for piping systems operating in extreme heat, furnaces, kilns, cement plants, cracking furnaces, and any high-temperature industrial process above 800°C where common grades like 304 or 316 would rapidly oxidise and fail. Amardeep Steel Centre is an ISO 9001:2015 certified manufacturer and global exporter of Stainless Steel 310S Pipe Fittings per ASTM A403 / ASME SA403, available in grades WP310, WP310S, and WP310H, sizes ½″ to 48″, in seamless, welded, and fabricated forms, supplied with EN 10204 / 3.1 mill test certificates.
What Are SS 310S Pipe Fittings?
SS 310S Pipe Fittings are pipe components — elbows, tees, reducers, caps, stub ends, and couplings designed for piping systems operating under intense heat and corrosive conditions. Their performance is rooted in a high-chromium (24–26%) and high-nickel (19–22%) austenitic composition exact values matching ASTM A403 chemical requirements. This gives them exceptional resistance to oxidation and corrosion at continuous service temperatures up to 1050°C.
Table of Contents
- SS 310S Pipe Fittings Specifications
- Chemical Composition (ASTM A403 WP310S)
- Mechanical Properties (ASTM A403 WP310S)
- SS 310S Material Equivalents — UNS / DIN / JIS / EN
- Heat Treatment & Dimensional Tolerances
- Types of SS 310S Pipe Fittings
- Applications of SS 310S Pipe Fittings
- Related Products
- Frequently Asked Questions
SS 310S Pipe Fittings Specifications
Every SS 310S Pipe Fittings manufactured at Amardeep Steel Centre conforms to the following standards and dimensional requirements.
Parameter |
Details |
Material Standard |
ASTM A403 / ASME SA403 |
Grade / UNS |
WP310S / UNS S31008 / WNR 1.4845 |
Dimensional Standard |
ASME B16.9, ASME B16.28, MSS-SP-43 |
Buttweld Fittings Size |
½″ NB to 48″ NB (Seamless & Welded / Fabricated) |
Forged Fittings Size |
¼″ to 4″ NB |
Wall Thickness / Schedule |
Sch 5S, 10S, 40S, STD, 80S, XS, 160, XXS |
Bending Radius |
R = 1D, 2D, 3D, 5D, 6D, 8D, 10D or custom |
Pressure Class (Forged) |
2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS |
Max Continuous Service Temp |
1050°C (1920°F) |
Max Intermittent Service Temp |
1100°C (2010°F) |
Heat Treatment |
Solution Annealed 1040–1150°C + Rapid Quench |
Forms Available |
Elbow, Tee, Reducer, Cap, Stub End, Bend, Cross, Coupling |
End Type |
Bevelled Ends (BW) per ASME B16.25 / Plain End / Threaded |
Surface Finish |
Pickled & Passivated (standard) |
Test Certificates |
EN 10204 / 3.1 Mill TC, PMI, Hydrostatic, UT (on request) |
SS 310S Pipe Fittings — Chemical Composition (ASTM A403 WP310S)
The high chromium and nickel content of SS 310S Pipe Fittings is the foundation of their excellent heat and oxidation resistance.
Element |
Content (%) |
Carbon (C) |
0.08 max |
Manganese (Mn) |
2.00 max |
Silicon (Si) |
1.50 max |
Phosphorus (P) |
0.045 max |
Sulfur (S) |
0.030 max |
Chromium (Cr) |
24.0–26.0 |
Nickel (Ni) |
19.0–22.0 |
SS 310S (WP310S) is widely preferred for welded piping applications due to its low carbon content, which reduces the risk of sensitisation and intergranular corrosion.
Mechanical Properties of SS 310S Pipe Fittings (ASTM A403 WP310S)
Property |
Value |
Tensile Strength (min) |
515 MPa (75 ksi) |
Yield Strength (0.2% min) |
205 MPa (30 ksi) |
Elongation |
40% |
Hardness |
95 HRB max |
Density |
7.96 g/cm³ |
Thermal Expansion |
15.9 × 10⁻⁶/°C |
Thermal Conductivity |
14.2 W/m·K |
SS 310S Material Equivalents — UNS / DIN / JIS / EN
SS 310S is referenced under different designations depending on the standard. Use this table when cross-referencing specifications from European, Japanese, or Indian engineering projects.
Standard |
Grade Name |
UNS Number |
DIN / Werkstoff No. |
JIS No. |
EN No. |
ASTM / ASME |
SS 310S ★ |
S31008 |
1.4845 |
SUS 310S |
X8CrNi25-21 |
★ WP310S / UNS S31008 / 1.4845 — primary stocking grade at Amardeep Steel Centre.
Heat Treatment & Dimensional Tolerances for SS 310S Pipe Fittings
Solution Annealing (1040–1150°C)
All Stainless Steel 310S Pipe Fittings are supplied in a solution-annealed condition and rapidly quenched to:
- Relieve internal stresses
- Dissolve chromium carbides
- Improve corrosion resistance
- Maintain a stable austenitic structure
Testing & Quality Controls
- Mill Test Certificate: EN 10204 / 3.1 (standard)
- Third-Party Inspection: Available on request
- PMI Testing: Available
- Hydrostatic Testing: Available
- TPI Agencies: TÜV, DNV, Lloyd’s, SGS, BV
Types of SS 310S Pipe Fittings — Buttweld, Forged & Seamless
Complete range of 310S pipe fittings for all connection and routing configurations. Each type links to its dedicated product page.
SS 310S Elbows (45°, 90°, 180°)
Long radius (1.5D) and short radius (1D) elbows for smooth direction changes. Long radius per ASME B16.9; short radius per ASME B16.28.
SS 310S Tees (Equal & Reducing)
Equal and reducing tees for 90° branch connections. Full-bore or reduced-bore outlets available in all schedules.
SS 310S Reducers (Concentric & Eccentric)
Concentric reducers for vertical/gas lines; eccentric reducers for horizontal liquid lines and pump suction to prevent air pockets.
SS 310S Caps
End caps for pipeline termination. Full-penetration weld provides maximum integrity at line ends.
SS 310S Stub Ends
Used with lap-joint flanges for economical flanged connections. Available in long and short pattern per ASME B16.9.
SS 310S Pipe Bends
Custom bends R=3D to 10D for gradual directional changes with minimal pressure drop. Available in any angle.
SS 310S Forged Fittings (Socket Weld & Threaded)
Class 3000# to 9000# socket weld and threaded fittings per ASTM A182 / ANSI B16.11 for high-pressure small-bore piping.
Applications of SS 310S Pipe Fittings
SS 310S Pipe Fittings are widely used in industries where operating temperatures exceed 800°C:
- Heat Treatment Furnaces – Radiant tubes and furnace components
- Cement Plants – Kiln and clinker handling systems
- Petrochemical Industry – Cracking furnaces and reformers
- Glass Manufacturing – Furnace and heat recovery systems
- Power Plants – High-temperature ducting and reheaters
- Chemical Processing – Reactor and heater piping
- Waste Incineration – Flue gas and combustion systems
These Stainless Steel 310S Pipe Fittings offer excellent resistance to oxidation, scaling, and thermal fatigue in extreme environments.
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Frequently Asked Questions — SS 310S Pipe Fittings
What is the main advantage of SS 310S Pipe Fittings?
SS 310S Pipe Fittings provide excellent oxidation resistance and high-temperature strength due to high chromium and nickel content, making them ideal for applications above 800°C.
What is the maximum service temperature for SS 310S pipe fittings?
SS 310S Pipe Fittings can operate at continuous temperatures up to 1050°C and intermittent temperatures up to 1100°C.
Does SS 310S resist carburisation?
Yes, SS 310S offers good resistance to carburising atmospheres due to its high chromium and nickel composition.
Can SS 310S Pipe Fittings be used in high-temperature industries?
Yes, Stainless Steel 310S Pipe Fittings are widely used in furnaces, petrochemical plants, and power generation systems where extreme heat resistance is required.
Do you provide test certificates with SS 310S Pipe Fittings?
Yes, all SS 310S Pipe Fittings are supplied with EN 10204 / 3.1 Mill Test Certificates, with additional testing available on request.
