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Stainless Steel 347 Fittings Supplier and Exporter
In the case of stabilised austenitic grades in the range of sensitisation temperatures from 425 to 875 degrees C, SS 347 differs from SS 321 in one important way, that is, the stabilising element. Unlike titanium, SS 347 is a material that is made of niobium (columbium). The weld metal produced with ER347 filler is naturally stabilised, no secondary treatment is required.ER347 filler does not consume niobium from the weld and produces a naturally stabilised weld metal. SS 347 is the preferred grade for complex multi-pass welded assemblies, weld overlay and for cases where contamination with titanium is not acceptable for nuclear service.
Solitaire Overseas offers a full line of Stainless Steel Fittings in both buttweld and forged forms in Grade 347 (UNS S34700, DIN 1.4550, EN X6CrNiNb18-10) to match the ASTM A403 WP347 and ASTM A182 F347 standards respectively. Available in standard sizes and documented with full EN 10204 3.1, SS 347 fittings are part of our Stainless Steel Products.
Table of Contents
- Stainless Steel 347 Fittings Supplier and Exporter Overview
- SS 347 Fittings Specifications
- Why Choose SS 347 Over SS 321 or SS 347H?
- Types of Stainless Steel 347 Fittings
- SS 347 Chemical Composition of SS 347 Fittings
- SS 347 Mechanical Properties Annealed Condition
- SS 347 Fittings Industry Applications
- Equivalent Grades of Stainless Steel 347 Fittings
- Dimensions Standard Of Stainless Steel 347 Fitting
- Size of Stainless Steel 347 Fittings
- Weight Chart of Stainless Steel 347 Fittings
- Pressure Rating of Stainless Steel 347 Fittings
- Frequently Asked Questions
- Related Products
SS 347 Fittings Specifications
| Parameter | Details |
|---|---|
| Grade | Stainless Steel 347 / S34700 |
| DIN / Werkstoff Nr. | 1.4550 |
| EN Designation | X6CrNiNb18-10 |
| Buttweld Standard | ASTM A403 WP347 / ASME SA403 WP347 |
| Forged Standard | ASTM A182 F347 / ASME SA182 F347 |
| Dimension Standard (BW) | ASME B16.9 / MSS SP-43 |
| Dimension Standard (Forged) | ASME B16.11 / MSS SP-79 |
| Size Range (BW) | 1/2" NB to 48" NB |
| Size Range (Forged) | 1/8" NPS to 4" NPS - Class 2000 / 3000 / 6000 / 9000 |
| Schedule Range | SCH 5S / 10S / 40S / 80S / 160 / XXS |
| End Types | Beveled End (BE), Plain End (PE), Threaded End (TE) |
| Test Certificates | EN 10204 3.1 MTC (standard); 3.2 on request |
| Third-Party Inspection | SGS / TUV / Bureau Veritas / Intertek (on request) |
| PMI Testing | Available on request |
| Surface Finish | Pickled, Annealed, Polished - 2B, No.4, Mirror on request |
| Origin | India / Japan / Europe (confirmed at order stage) |
| Delivery | Ready stock for common sizes; custom: 4 to 8 weeks |
Why Choose SS 347 Over SS 321 or SS 347H?
Both SS 347 and SS 321 Fittings resist intergranular corrosion in the sensitisation range. The table below shows the key selection criteria for buyers choosing between the three stabilised grades.
| Property | SS 347 (This Grade) | SS 321 | SS 347H |
|---|---|---|---|
| Stabilising Element | Niobium / Columbium (Nb) | Titanium (Ti) | Niobium (Nb) |
| Carbon Max | 0.08% | 0.08% | 0.04 to 0.10% |
| Weld Deposit Stabilisation | Yes - Nb retained in weld | No - Ti lost to arc | Yes |
| Best For | Welded assemblies, nuclear service | High-temp non-nuclear service | High-temp welded, creep-limited service |
| Nuclear / Radiation Service | Preferred (no Ti) | Acceptable in some cases | Preferred |
Note: SS 347 and SS 348 share similar compositions. SS 348 carries tighter cobalt and tantalum limits for specific nuclear codes. Confirm the applicable code with your inspector before specifying grade 347 for nuclear service.
Types of Stainless Steel 347 Fittings
SS Buttweld Fittings and SS Forged Fittings in Grade 347 are available in the following forms:
ASTM A182 SS 347 _ 347H Forged 45 Degree Elbow
ASTM A182 SS 347 _ 347H Forged 90 Degree Elbow
ASTM A182 SS 347 _ 347H Forged Socket Weld Cross
ASTM A182 SS 347 _ 347H Forged Socket Weld Tee
ASTM A182 SS 347 _ 347H Socket Weld Cap
ASTM A182 SS 347 _ 347H Threaded _ Screwed Bushing
ASTM A182 SS 347 _ 347H Threaded _ Screwed Hex Plug
ASTM A182 SS 347 _ 347H Threaded _ Screwed Union
ASTM A182 SS 347 Forged Socket Weld Full Coupling
ASTM A182 SS 347 Forged Socket Weld Half Coupling
ASTM A182 SS 347 Threaded _ Screwed Pipe Nipple
ASTM A182 SS 347 Threaded _ Screwed Street Elbow
ASTM A403 WP347 _ 347H SS 45° Elbow
ASTM A403 WP347 _ 347H SS 90° Elbow
ASTM A403 WP347 _ 347H SS 180° Elbow
ASTM A403 WP347 _ 347H SS Concentric Reducer
ASTM A403 WP347 _ 347H SS Eccentric Reducer
ASTM A403 WP347 _ 347H SS End Pipe Cap
ASTM A403 WP347 _ 347H SS Equal Cross
ASTM A403 WP347 _ 347H SS Equal Tee
ASTM A403 WP347 _ 347H SS LR Elbow
ASTM A403 WP347 _ 347H SS Reducing Tee
ASTM A403 WP347 _ 347H SS SR Elbow
ASTM A403 WP347 _ 347H SS Stub End
Need SS 347 Fittings for your project?
Solitaire Overseas stocks standard sizes for immediate dispatch. Send your size, schedule, grade, quantity, and inspection requirement for a fast quote with MTC availability and delivery timeline.
Request a QuoteSS 347 Chemical Composition of SS 347 Fittings
| Element | Range / Limit | Note |
|---|---|---|
| Carbon (C) | 0.08% max | |
| Chromium (Cr) | 17.0 to 19.0% | |
| Nickel (Ni) | 9.0 to 13.0% | |
| Niobium + Tantalum (Nb+Ta) | 10 x C min to 1.10% max | Stabilising element - Nb binds carbon and stabilises weld deposits |
| Manganese (Mn) | 2.0% max | |
| Silicon (Si) | 1.0% max | |
| Phosphorus (P) | 0.045% max | |
| Sulphur (S) | 0.030% max |
SS 347 Mechanical Properties Annealed Condition
Values per ASTM A403 WP347 (buttweld) and ASTM A182 F347 (forged)
| Property | Seamless | Welded | Forged |
|---|---|---|---|
| Tensile Strength (min) | 515 MPa / 75 ksi | 515 MPa / 75 ksi | 515 MPa / 75 ksi |
| Yield Strength 0.2% (min) | 205 MPa / 30 ksi | 205 MPa / 30 ksi | 205 MPa / 30 ksi |
| Elongation (min) | 35% | 35% | 35% |
| Hardness (max) | 201 HB / 92 HRB | 201 HB / 92 HRB | 201 HB / 92 HRB |
Related flange products in stainless steel are available on our SS Flanges page. For SS 316 flanges, visit our SS 316 Flanges page.
SS 347 Fittings Industry Applications
- Oil & Gas Industry
- Chemical Industry
- Petrochemical
- Power Industry
- Construction
- Fertilizers Industry
- Automotive Industry
- Food And Beverage Industry
Explore other piping in the same grade: SS Pipes and SS Tubes.
Equivalent Grades of Stainless Steel 347 Fittings
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN |
|---|---|---|---|---|---|
| SS 347 | 1.4550 | S34700 | SUS 347 | 08Ch18N12B | X6CrNiNb18-10 |
Dimensions Standard Of Stainless Steel 347 Fitting
| NB (MM) | NPS (Inch) | O.D. Y (MM) | Wall Thickness T (MM) | Schedule | LR 45° Elbow Center-Face B (MM) | LR 45° Weight (KG) | LR 90° Elbow Center-Face A (MM) | LR 90° Weight (KG) | SR 90° Elbow Center-Face A (MM) | SR 90° Weight (KG) |
|---|---|---|---|---|---|---|---|---|---|---|
| 15 | 1/2 | 21.3 | 2.78 | STD | 15.9 | 0.04 | 38.1 | 0.08 | - | - |
| 15 | 1/2 | 21.3 | 3.73 | XS | 15.9 | 0.05 | 38.1 | 0.10 | - | - |
| 20 | 3/4 | 26.7 | 2.87 | STD | 11.1 | 0.04 | 28.6 | 0.08 | - | - |
| 20 | 3/4 | 26.7 | 3.91 | XS | 11.1 | 0.05 | 28.6 | 0.11 | - | - |
| 25 | 1 | 33.4 | 3.38 | STD | 22.2 | 0.09 | 38.1 | 0.15 | 25.4 | 0.11 |
| 25 | 1 | 33.4 | 4.55 | XS | 22.2 | 0.11 | 38.1 | 0.19 | 25.4 | 0.14 |
| 32 | 1 1/4 | 42.2 | 3.56 | STD | 25.4 | 0.14 | 47.6 | 0.28 | 31.75 | 0.18 |
| 32 | 1 1/4 | 42.2 | 4.85 | XS | 25.4 | 0.20 | 47.6 | 0.39 | 31.75 | 0.24 |
| 40 | 1 1/2 | 48.3 | 3.68 | STD | 28.6 | 0.20 | 57.1 | 0.40 | 38.1 | 0.26 |
| 40 | 1 1/2 | 48.3 | 5.08 | XS | 28.6 | 0.25 | 57.1 | 0.50 | 38.1 | 0.35 |
| 50 | 2 | 60.3 | 3.91 | STD | 34.9 | 0.36 | 76.2 | 0.72 | 50.8 | 0.50 |
| 50 | 2 | 60.3 | 5.54 | XS | 34.9 | 0.50 | 76.2 | 1.00 | 50.8 | 0.68 |
| 65 | 2 1/2 | 73.0 | 5.16 | STD | 44.4 | 0.73 | 95.2 | 1.46 | 63.5 | 0.95 |
| 65 | 2 1/2 | 73.0 | 7.01 | XS | 44.4 | 0.91 | 95.2 | 1.82 | 63.5 | 1.27 |
| 80 | 3 | 88.9 | 5.49 | STD | 50.8 | 1.10 | 114.3 | 2.18 | 76.2 | 1.45 |
| 80 | 3 | 88.9 | 7.62 | XS | 50.8 | 1.45 | 114.3 | 2.86 | 76.2 | 1.95 |
| 100 | 4 | 114.3 | 6.02 | STD | 63.5 | 2.10 | 152.4 | 4.20 | 101.6 | 2.80 |
| 100 | 4 | 114.3 | 8.56 | XS | 63.5 | 2.90 | 152.4 | 5.70 | 101.6 | 3.90 |
| 125 | 5 | 141.3 | 6.65 | STD | 79.4 | 3.40 | 190.0 | 6.80 | 127.0 | 4.80 |
| 125 | 5 | 141.3 | 9.50 | XS | 79.4 | 5.00 | 190.0 | 10.00 | 127.0 | 6.50 |
| 150 | 6 | 168.3 | 7.11 | STD | 95.2 | 5.10 | 229.0 | 10.10 | 152.4 | 6.80 |
| 150 | 6 | 168.3 | 10.97 | XS | 95.2 | 7.70 | 229.0 | 15.30 | 152.4 | 10.20 |
Size of Stainless Steel 347 Fittings
| NPS (Inch) | Pipe Schedule | OD (Inch) | Wall Thickness (Inch) | Allowable Stress 100 | 200 | 300 | 400 | 500 |
|---|---|---|---|---|---|---|---|---|
| 1 | 40 | 1.315 | 0.133 | 2205 | 2205 | 2205 | 2047 | 1902 |
| 1 | 80 | 1.315 | 0.179 | 3061 | 3061 | 3061 | 2841 | 2640 |
| 1 | 160 | 1.315 | 0.250 | 4493 | 4493 | 4493 | 4170 | 3874 |
| 1 1/2 | 40 | 1.900 | 0.145 | 1629 | 1629 | 1629 | 1512 | 1404 |
| 1 1/2 | 80 | 1.900 | 0.200 | 2303 | 2303 | 2303 | 2138 | 1986 |
| 1 1/2 | 160 | 1.900 | 0.281 | 3362 | 3362 | 3362 | 3120 | 2899 |
| 2 | 40 | 2.375 | 0.154 | 1371 | 1371 | 1371 | 1272 | 1182 |
| 2 | 80 | 2.375 | 0.218 | 1985 | 1985 | 1985 | 1843 | 1712 |
| 2 | 160 | 2.375 | 0.344 | 3283 | 3283 | 3283 | 3047 | 2831 |
| 3 | 40 | 3.500 | 0.216 | 1301 | 1301 | 1301 | 1208 | 1122 |
| 3 | 80 | 3.500 | 0.300 | 1844 | 1844 | 1844 | 1712 | 1590 |
| 3 | 160 | 3.500 | 0.438 | 2787 | 2787 | 2787 | 2587 | 2403 |
| 4 | 40 | 4.500 | 0.237 | 1102 | 1102 | 1102 | 1023 | 950 |
| 4 | 80 | 4.500 | 0.337 | 1596 | 1596 | 1596 | 1482 | 1377 |
| 4 | 160 | 4.500 | 0.531 | 2611 | 2611 | 2611 | 2424 | 2252 |
| 5 | 40 | 5.563 | 0.258 | 965 | 965 | 965 | 896 | 832 |
| 5 | 80 | 5.563 | 0.375 | 1428 | 1428 | 1428 | 1325 | 1231 |
| 5 | 160 | 5.563 | 0.625 | 2474 | 2474 | 2474 | 2296 | 2133 |
Weight Chart of Stainless Steel 347 Fittings
| Normal Pipe Size | A | B | Qty | Weight (KG) |
|---|---|---|---|---|
| 1/4 | 0.81 | 0.88 | 160 | 0.20 |
| 3/8 | 0.97 | 1.00 | 130 | 0.26 |
| 1/2 | 1.12 | 1.31 | 100 | 0.57 |
| 3/4 | 1.31 | 1.50 | 75 | 0.71 |
| 1 | 1.50 | 1.81 | 40 | 1.08 |
| 1 1/4 | 1.75 | 2.19 | 25 | 1.68 |
| 1 1/2 | 2.00 | 2.44 | 18 | 2.38 |
| 2 | 2.38 | 2.97 | 10 | 3.55 |
| 2 1/2 | 3.00 | 3.62 | 4 | 6.22 |
| 3 | 3.38 | 4.31 | 2 | 10.36 |
| 4 | 4.19 | 5.75 | 1 | 23.91 |
Pressure Rating of Stainless Steel 347 Fittings
| Temperature (°F) | Temperature (°C) | Class 150 | Class 300 (1/4"-1") | Class 300 (1 1/4"-2") | Class 300 (2 1/2"-3") |
|---|---|---|---|---|---|
| -20 to 150 | -29 to 66 | 300 | 2000 | 1500 | 1000 |
| 200 | 93 | 265 | 1785 | 1350 | 910 |
| 250 | 121 | 225 | 1575 | 1200 | 825 |
| 300 | 149 | 185 | 1360 | 1050 | 735 |
| 350 | 177 | 150 | 1150 | 900 | 650 |
| 400 | 204 | - | 935 | 750 | 560 |
| 450 | 232 | - | 725 | 600 | 475 |
| 500 | 260 | - | 510 | 450 | 385 |
| 550 | 288 | - | 300 | 300 | 300 |
Frequently Asked Questions
Both grades resist sensitisation. SS 347 uses niobium as stabiliser; SS 321 uses titanium. Niobium is retained in weld deposits, making 347 the preferred choice for welded assemblies and nuclear service.
ASTM A403 WP347 covers buttweld fittings; ASTM A182 F347 covers forged fittings. ASME equivalents are SA403 WP347 and SA182 F347 respectively.
Titanium is avoided in nuclear coolant systems. SS 347, stabilised with niobium, avoids Ti contamination. ER347 filler wire welds produce a stabilised deposit, making it inherently suitable for nuclear piping.
SS 347 resists sensitisation for sustained service in the 425 to 875 degrees C range. Above 875 degrees C niobium carbides dissolve and protection diminishes. Use SS 310 or 310S for higher temperatures.
Yes. Solitaire Overseas supplies SS 347 fittings with EN 10204 3.1 MTC, PMI testing, and third-party inspection by SGS, Bureau Veritas, TUV, or Intertek on request.
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