Stainless Steel Fittings
SS Pipe Fittings A403 316L
SS Pipe Fittings A403 316L Supplier, ASTM A403 WP316L Stainless Steel Fittings, Reliable Pipes & Tubes.
Reliable Pipes & Tubes – Leading SS Pipe Fittings A403 316L Supplier
Reliable Pipes & Tubes is a leading supplier, stockholder, and exporter of high-grade SS Pipe Fittings A403 316L. SS Pipe Fittings A403 316L refers to ASTM A403 standard covering wrought austenitic stainless steel piping fittings for pressure service in the WP316L low-carbon grade. The low carbon content in SS Pipe Fittings A403 316L (maximum 0.030% carbon) makes them ideal for applications where sensitization must be avoided, especially in welded assemblies to prevent intergranular corrosion.
The SS Pipe Fittings A403 316L are designed for forged steel pipe fittings and can be used in many critical engineering fields including chemical processing, energy conversion plants, food and beverage, marine, pharmaceutical, and other corrosive environments. Material under ASTM A403 is named as WP Grade, and for each WP grade stainless steel, several categories of pipe fittings are included to indicate that a seamless or welded structure is used.
We offer a comprehensive range of SS Pipe Fittings A403 316L from 1/2" NB to 48" NB in various schedules to meet custom applications. Every SS Pipe Fittings A403 316L supplied by Reliable Pipes & Tubes undergoes rigorous testing including tensile testing, chemical analysis, and visual inspection to ensure optimal quality and structural integrity.
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What is SS Pipe Fittings A403 316L?
SS Pipe Fittings A403 316L refers to ASTM A403 standard for wrought austenitic stainless steel piping fittings, specifically the WP316L low-carbon variant. The SS Pipe Fittings A403 316L are specifically designed for forged steel pipe fittings; cast pipe fittings are not suitable under this standard. The key advantage of SS Pipe Fittings A403 316L over the standard 316 grade is the reduced carbon content (max 0.030% vs 0.08%), which significantly reduces the risk of carbide precipitation during welding and improves corrosion resistance after heat exposure. All SS Pipe Fittings A403 316L should be supplied in heat treated condition and all welding work should be done before heat treatment.
SS Pipe Fittings A403 316L Quick Details
| Parameter |
Details |
| Company Name | Reliable Pipes & Tubes |
| Country/Region | India |
| FOB Price | US $1900 - $6500 / Metric Ton |
| Port | Nhava Sheva Port, Mumbai |
| Main Products | Pipe Fittings, Elbows, Tees, Reducers, Caps, Flanges |
| Certification | ISO 9001, ISO 14001 & OHSAS 18001 |
SS Pipe Fittings A403 316L Specifications
| Specification Heading |
Details |
| Specification | ASTM A403 / ASME SA403 |
| Grade | WP316L |
| UNS Number | S31603 |
| DIN / EN | 1.4404 / 1.4435 |
| Types | Seamless or Welded |
| Dimension Range | 1/2" NB to 48" NB |
| Wall Thickness Range | Schedule 10S, Schedule 40S, Schedule 80S, Schedule 160S, Schedule XXS |
| Dimension Standards | ASME B16.9, ASME B16.11, MSS SP-43, MSS SP-79, MSS SP-95, MSS SP-97, BS3799, BS21, ISO 4144 |
| Fitting Types | Elbow, Tee, Cap, Reducer, Coupling, Nipple, Bend, Olets, Stubend, Cross |
| Surface Finish | Pickled, Annealed & Pickled, Bright Annealed, Passivated |
| Ends | Plain Ends, Beveled Ends, Threaded Ends |
| Packaging | Wooden Pallet / Wooden Box / Plastic Cloth Wraps / Plastic End Caps |
| Material Test Certificate | EN10204 3.1, 3.2 / Laboratory Test Certificate from NABL Approved Lab. / Under Third Party Inspection Agency like SGS, TUV, DNV, LLOYDS, ABS etc. |
| Equivalent Standards | GOST, AWWA, BS, SS, KS, AISI, JIS, GB, IS, ISO, SAE, DIN, NFA, API, ASTM, CSA, ANSI, EN, UNI |
Referred Standards of SS Pipe Fittings A403 316L
| Standard |
Description |
| ASTM A182/A182M | Forged or rolled alloy steel pipe flanges, forged fittings and valves and parts for high temperature service |
| ASTM A403/A403M | Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings |
| ASTM A815/A815M | Wrought ferritic, ferritic/austenitic and martensitic stainless steel piping fittings |
| AS 2129 | Flanges for pipes, valves and fittings |
| ANSI/ASME B1.20.1 | Pipe threads, general purpose (inch) |
| ANSI B16.5 | Steel pipe flanges and flanged fittings |
| ANSI B16.9 | Factory-made wrought steel butt-welding fittings |
| ANSI B16.11 | Forged steel fittings socket-welding and threaded |
| ANSI B16.25 | Butt-welding ends |
| MSS SP-43 | Wrought stainless steel butt-welding fittings |
| MSS SP-95 | Swage(d) Nipples and Bull Plugs |
| BS 21 | Threading |
| ISO 4144 | Stainless steel fittings threaded to ISO 7-1 |
| BS 3799 | Specification for Steel pipe fittings, screwed and Socket-welding for the petroleum industry |
| ASME B16.28 | Wrought Steel Buttwelding Short Radius Elbows and Returns |
| AWS A5.4, A5.9, A5.11, A5.14 | Welding Consumables Standards |
Physical Properties of SS Pipe Fittings A403 316L
| Property |
Value |
| Density | 8000 kg/m3 (8.0 g/cm3) |
| Elastic Modulus | 193 GPa |
| Mean Co-eff of Thermal Expansion (0-100°C) | 15.9 µm/m/°C |
| Mean Co-eff of Thermal Expansion (0-315°C) | 16.2 µm/m/°C |
| Mean Co-eff of Thermal Expansion (0-538°C) | 17.5 µm/m/°C |
| Thermal Conductivity (at 100°C) | 16.3 W/m.K |
| Thermal Conductivity (at 500°C) | 21.5 W/m.K |
| Specific Heat (0-100°C) | 500 J/kg.K |
| Electrical Resistivity | 740 nΩ.m |
Chemical Composition of SS Pipe Fittings A403 316L
| Element |
Min (%) |
Max (%) |
| Carbon (C) | - | 0.03 |
| Manganese (Mn) | - | 2.0 |
| Silicon (Si) | - | 0.75 |
| Phosphorus (P) | - | 0.045 |
| Sulfur (S) | - | 0.03 |
| Chromium (Cr) | 16.0 | 18.0 |
| Nickel (Ni) | 10.0 | 14.0 |
| Molybdenum (Mo) | 2.0 | 3.0 |
| Nitrogen (N) | - | 0.10 |
* The key characteristic of SS Pipe Fittings A403 316L is the low carbon content (max 0.03%) vs. 316 (max 0.08%), which minimizes carbide precipitation during welding.
Mechanical Properties of SS Pipe Fittings A403 316L
| Property |
Value |
| Tensile Strength, min | 485 MPa (70 ksi) |
| Yield Strength 0.2% Proof, min | 170 MPa (25 ksi) |
| Elongation in 50mm, min % | 40% |
| Elongation (Longitudinal), min % | 35% |
| Elongation (Transverse), min % | 25% |
| Hardness Rockwell B (HR B), max | 95 |
| Hardness Brinell (HB), max | 217 |
| Melting Point | 1375 – 1400 °C |
Equivalent Grades For SS Pipe Fittings A403 316L
| STANDARD |
WERKSTOFF NR. |
UNS |
JIS |
BS |
AFNOR |
EN |
| WP316L |
1.4404 / 1.4435 |
S31603 |
SUS 316L |
316S11 |
Z3CND17-11-02 |
X2CrNiMo17-12-2 / X2CrNiMo17-13-3 |
* Note: These comparisons are approximate only. If exact equivalents are needed original specifications must be consulted.
SS Pipe Fittings A403 316L Dimensions
1. SS Pipe Fittings A403 316L Elbows and Returns Dimensions
| Nominal Pipe Size (inches) |
Outside Diameter (mm) |
Outside Diameter (inches) |
90° Elbows |
45° Elbows |
180° Returns |
| Long Radius (inches) |
Short Radius (inches) |
Long Radius (inches) |
Center to Center (inches) |
Back to Face (inches) |
| 1/2 | 21.3 | 0.840 | 1 1/2 | - | 5/8 | 3 | 1 7/8 |
| 3/4 | 26.7 | 1.050 | 1 1/8 | - | 7/16 | 2 1/4 | 1 11/16 |
| 1 | 33.4 | 1.315 | 1 1/2 | 1 | 7/8 | 3 | 2 3/16 |
| 1 1/4 | 42.2 | 1.660 | 1 7/8 | 1 1/4 | 1 | 3 3/4 | 2 7/8 |
| 1 1/2 | 48.3 | 1.900 | 2 1/4 | 1 1/2 | 1 1/8 | 4 1/2 | 3 1/4 |
| 2 | 60.3 | 2.375 | 3 | 2 | 1 3/8 | 6 | 4 3/16 |
| 2 1/2 | 73.0 | 2.875 | 3 3/4 | 2 1/2 | 1 3/4 | 7 1/2 | 5 3/16 |
| 3 | 88.9 | 3.500 | 4 1/2 | 3 | 2 | 9 | 6 1/4 |
| 3 1/2 | 101.6 | 4.000 | 5 1/4 | 3 1/2 | 2 1/4 | 10 1/2 | 7 1/4 |
| 4 | 114.3 | 4.500 | 6 | 4 | 2 1/2 | 12 | 8 1/4 |
| 5 | 141.3 | 5.563 | 7 1/2 | 5 | 3 1/8 | 15 | 10 5/16 |
| 6 | 168.3 | 6.625 | 9 | 6 | 3 3/4 | 18 | 12 5/16 |
| 8 | 219.1 | 8.625 | 12 | 8 | 5 | 24 | 16 5/16 |
| 10 | 273.1 | 10.750 | 15 | 10 | 6 1/4 | 30 | 20 3/8 |
| 12 | 323.9 | 12.750 | 18 | 12 | 7 1/2 | 36 | 24 3/8 |
2. SS Pipe Fittings A403 316L Tees, Caps, Stub Ends and Straight Crosses Dimensions
| Nominal Pipe Size (inches) |
Outside Diameter (mm) |
Outside Diameter (inches) |
Caps |
Straight Tees |
Straight Crosses |
Stub Ends |
| Length (inches) |
Center to End (inches) |
Center to End (inches) |
Lap Diameter (inches) |
Long Length (inches) |
Short Length (inches) |
| 1/2 | 21.3 | 0.840 | 1 | 1 | - | 1 3/8 | 3 | 2 |
| 3/4 | 26.7 | 1.050 | 1 | 1 1/8 | - | 1 11/16 | 3 | 2 |
| 1 | 33.4 | 1.315 | 1 1/2 | 1 1/2 | 1 1/2 | 2 | 4 | 2 |
| 1 1/4 | 42.2 | 1.660 | 1 1/2 | 1 7/8 | 1 7/8 | 2 1/2 | 4 | 2 |
| 1 1/2 | 48.3 | 1.900 | 1 1/2 | 2 1/4 | 2 1/4 | 2 7/8 | 4 | 2 |
| 2 | 60.3 | 2.375 | 1 1/2 | 2 1/2 | 2 1/2 | 3 5/8 | 6 | 2 1/2 |
| 2 1/2 | 73.0 | 2.875 | 1 1/2 | 3 | 3 | 4 1/8 | 6 | 2 1/2 |
| 3 | 88.9 | 3.500 | 2 | 3 3/8 | 3 3/8 | 5 | 6 | 2 1/2 |
| 3 1/2 | 101.6 | 4.000 | 2 1/2 | 3 3/4 | 3 3/4 | 5 1/2 | 6 | 3 |
| 4 | 114.3 | 4.500 | 2 1/2 | 4 1/8 | 4 1/8 | 6 1/16 | 6 | 3 |
| 5 | 141.3 | 5.563 | 3 | 4 7/8 | 4 7/8 | 7 5/16 | 8 | 3 |
| 6 | 168.3 | 6.625 | 3 1/2 | 5 5/8 | 5 5/8 | 8 1/2 | 8 | 3 1/2 |
| 8 | 219.1 | 8.625 | 4 | 7 | 7 | 10 5/8 | 8 | 4 |
| 10 | 273.1 | 10.750 | 5 | 8 1/2 | 8 1/2 | 12 3/4 | 10 | 5 |
| 12 | 323.9 | 12.750 | 6 | 10 | 10 | 15 | 10 | 6 |
3. SS Pipe Fittings A403 316L Reducers Dimensions
| Nominal Pipe Size (inches) |
Outside Diameter (mm) |
Outside Diameter (inches) |
Reduced to (inches) |
Concentric & Eccentric Length (inches) |
| 1/2 | 21.3 | 0.840 | 1/4, 3/8 | 1 1/2 |
| 3/4 | 26.7 | 1.050 | 3/8, 1/2 | 2 |
| 1 | 33.4 | 1.315 | 3/8, 1/2, 3/4 | 2 |
| 1 1/4 | 42.2 | 1.660 | 1/2, 3/4, 1 | 2 |
| 1 1/2 | 48.3 | 1.900 | 1/2, 3/4, 1, 1 1/4 | 2 1/2 |
| 2 | 60.3 | 2.375 | 3/4, 1, 1 1/4, 1 1/2 | 3 |
| 2 1/2 | 73.0 | 2.875 | 1, 1 1/4, 1 1/2, 2 | 3 1/2 |
| 3 | 88.9 | 3.500 | 1, 1 1/2, 2, 2 1/2 | 3 1/2 |
| 3 1/2 | 101.6 | 4.000 | 1 1/4, 1 1/2, 2, 2 1/2, 3 | 4 |
| 4 | 114.3 | 4.500 | 1 1/2, 2, 2 1/2, 3, 3 1/2 | 4 |
| 5 | 141.3 | 5.563 | 2, 2 1/2, 3, 3 1/2, 4 | 5 |
| 6 | 168.3 | 6.625 | 2 1/2, 3, 3 1/2, 4, 5 | 5 1/2 |
| 8 | 219.1 | 8.625 | 3, 3 1/2, 4, 5, 6 | 6 |
| 10 | 273.1 | 10.750 | 4, 5, 6, 8 | 7 |
| 12 | 323.9 | 12.750 | 5, 6, 8, 10 | 8 |
Fitting Types for SS Pipe Fittings A403 316L
| Fitting Type |
Description |
| Elbow | SS Pipe Fittings A403 316L – 45°, 90°, 180° elbows, including 3D/5D/10D bends for directional changes |
| Tee | SS Pipe Fittings A403 316L – Equal and reducing/unequal tees for branching connections |
| Cap | SS Pipe Fittings A403 316L – End caps to safely close pipe ends |
| Reducer | SS Pipe Fittings A403 316L – Concentric and eccentric reducers for size transition |
| Coupling | SS Pipe Fittings A403 316L – Couplings for joining pipes of the same size |
| Nipple | SS Pipe Fittings A403 316L – Barrel nipples, reducing nipples, swage nipples |
| Bend | SS Pipe Fittings A403 316L – Long radius, short radius, and customized piggable bends |
| Olets | SS Pipe Fittings A403 316L – Weldolets, sockolets, threadolets, and branch outlets |
SS Pipe Fittings A403 316L ASTM A403 Standard Scope
The ASTM A403 standard for SS Pipe Fittings A403 316L includes several grades of austenitic stainless steel alloys, and uses the WP or CR prefix to mark the grade of steel. Steel for SS Pipe Fittings A403 316L should be smelted using one of the following methods:
- Electric furnace (with separate refining optional)
- Vacuum furnace
- One of the former followed by vacuum remelting or electroslag consumable electrode remelting
- If secondary melting is used, the furnace number refers to all steel ingots remelted with one smelting furnace number
The forming or forging operation for SS Pipe Fittings A403 316L may be performed by hammer forging, press forging, perforating, extrusion, upsetting, rolling, bending, welding or machining, or two or more methods at the same time. All SS Pipe Fittings A403 316L should be supplied in heat treated condition and all welding work should be done before heat treatment.
Surface Finish Requirements for SS Pipe Fittings A403 316L
- Surface crack (fish scales) deeper than 1/64 inch (0.4 mm) should be removed from SS Pipe Fittings A403 316L
- Mechanical flaws deeper than 1/16 inch (1.6 mm) should be removed from SS Pipe Fittings A403 316L
- SS Pipe Fittings A403 316L shall not have a surface discontinuity deeper than 5% of the specified nominal wall thickness
- SS Pipe Fittings A403 316L shall have a good machined surface and shall be free of scale and passivated
Repair by Welding Allowance for SS Pipe Fittings A403 316L
- When the defect depth exceeds 33 1/3% of the nominal wall thickness in SS Pipe Fittings A403 316L, weld repair is not allowed
- When the defect area exceeds 10% of the surface area of SS Pipe Fittings A403 316L, weld repair is not allowed
- Unacceptable defects should be removed by mechanical means or by thermal cutting or gouging methods
- SS Pipe Fittings A403 316L shall be free of scale and shall be passivated
SS Pipe Fittings A403 316L Stock List
- SS Pipe Fittings A403 316L – 90 Deg Elbow (Long / Short Radius)
- SS Pipe Fittings A403 316L – 45 Deg Elbow
- SS Pipe Fittings A403 316L – 180 Deg Elbow (Return Bend)
- SS Pipe Fittings A403 316L – Equal Tee
- SS Pipe Fittings A403 316L – Reducing Tee
- SS Pipe Fittings A403 316L – Concentric Reducer
- SS Pipe Fittings A403 316L – Eccentric Reducer
- SS Pipe Fittings A403 316L – End Cap / Pipe Cap
- SS Pipe Fittings A403 316L – Stubend (Long / Short Length)
- SS Pipe Fittings A403 316L – Barrel / Swage / Reducing Nipple
- SS Pipe Fittings A403 316L – 3D, 5D, 10D Piggable Bend
- SS Pipe Fittings A403 316L – Weldolets / Sockolets / Threadolets
Testing Requirements for SS Pipe Fittings A403 316L
| Test Type |
Details |
| Tensile Test | Longitudinal or transverse cut specimens; properties shall comply with tensile requirements per A370 methods |
| Chemical Analysis | Each cast or furnace steel chemical composition shall be determined and comply with WP316L requirements |
| Visual Inspection | All SS Pipe Fittings A403 316L shall be visually inspected for surface discontinuities |
| Liquid Penetrant Test | As per ASTM E165 Practice for Liquid Penetrant Examination for General Industry |
| Grain Size Test | As per ASTM E112 Test Methods for Determining Average Grain Size |
| Radiography Testing | 100% Radiography Tested for welded fittings where specified |
| PMI Testing | Positive Material Identification for SS Pipe Fittings A403 316L |
| Hydrostatic Test | As required per applicable standards |
| Hardness Test | Rockwell and Brinell hardness testing as required |
SS Pipe Fittings A403 316L Price List
| Product Description |
Price (FOB) |
| SS Pipe Fittings A403 316L – Elbow | US $2.20 - 19.00 / Piece |
| SS Pipe Fittings A403 316L – Tee | US $3.20 - 24.00 / Piece |
| SS Pipe Fittings A403 316L – Reducer | US $2.80 - 21.00 / Piece |
| SS Pipe Fittings A403 316L – Cap | US $1.60 - 14.00 / Piece |
| SS Pipe Fittings A403 316L – Coupling | US $1.10 - 9.50 / Piece |
| SS Pipe Fittings A403 316L – Bend | US $5.50 - 60.00 / Piece |
| SS Pipe Fittings A403 316L – Per Ton | US $2400 - 5200 / Ton |
Packaging and Sea Transportation Protection
At Reliable Pipes & Tubes, packaging is processed with standard anti-rust measures and sea transportation security rules. We ensure that your SS Pipe Fittings A403 316L reach safely and in perfect condition via the following packaging modes:
- Bundle packing with steel strips
- Crate packing (wooden cases)
- Naked packing
- End protection with plastic caps or wooden protectors