ASTM A106 Gr B Pipe FittingsASTM A234 WPB · Manufacturer, trader & exporter, India
Also sold as SA-106 Gr B · Seamless carbon steel pipe · UNS K03006
ASTM A106 Gr B pipe fittings are made to ASTM A234 WPB for buttweld fittings and ASTM A105 for forged socket-weld and threaded fittings, with dimensions to ASME B16.9 and B16.11. It is a seamless carbon steel pipe for high-temperature service, chosen for high-temperature process and steam piping in refineries and power plants. Kanak Steel & Engineering Co. manufactures, trades and exports it from Mumbai; EN 10204 3.1 or 3.2 certificates are available on request / as specified in the PO. Markets we have supplied to include Oman, UAE, Saudi Arabia, Brazil, Argentina, Spain and Chile (India is the home market).
- Stock & mill supply
- EN 10204 3.1 / 3.2
- Mill test certificates
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is ASTM A106 Gr B Pipe Fittings?
ASTM A106 Gr B pipe fittings is a seamless carbon steel pipe for high-temperature service supplied as pipe fittings to ASTM A234 WPB. Buyers specify it for high-temperature process and steam piping in refineries and power plants. It is also sold as SA-106 Gr B, Seamless carbon steel pipe, UNS K03006.
- What it is
- Seamless carbon steel pipe for high-temperature service
- Buttweld
- ASTM A234 WPB
- Forged
- ASTM A105
- Dimensions
- ASME B16.9 · B16.11 · MSS SP-43
- Sizes
- Buttweld ½" – 48" · forged ⅛" – 4"
- Best at
- High-temperature process and steam piping in refineries and power plants
ASTM A106 Gr B Pipe Fittings Specification & Sizes
| Buttweld fittings | ASTM A234 WPB — dimensions to ASME B16.9, MSS SP-43 |
|---|---|
| Forged fittings | ASTM A105 — dimensions to ASME B16.11 |
| Short-radius elbows | ASME B16.9 (formerly B16.28) |
| Buttweld sizes | NPS ½" to 48", schedule to match the pipe |
| Forged classes | Socket weld 3000 / 6000 / 9000 · threaded 2000 / 3000 / 6000 |
| Types | Elbow · Tee · Reducer · Cap · Stub end · Cross · Bend · Lateral · Coupling · Union · Nipple · Plug |
| Testing | PMI · dimensional · radiography of welded fittings · IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
Choosing ASTM A106 Gr B Fittings: Elbow Radius, Schedule & Class
State seamless or welded, and the non-destructive examination you need on welds.
Radius (LR, SR, 3D), the schedule-to-class map and the 1.5 mm socket-weld gap are explained in the fittings guide. For A106 B, buttweld fittings are ASTM A234 WPB and forged fittings ASTM A105.
ASTM A106 Gr B Pipe Fittings Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
| Chromium | As specified |
| Copper | As specified |
| Nickel | As specified |
| Molybdenum | As specified |
| Vanadium | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A106 Grade B.
ASTM A106 Gr B Pipe Fittings Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A106 Grade B — condition per order.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting range | 1420 – 1530 °C |
| Magnetic | Magnetic |
ASTM A106 Gr B Equivalent Grades
ASTM A106 Gr B buttweld fitting dimensions — ASME B16.9
Centre-to-end and end-to-end dimensions are the same for every alloy; the wall thickness follows the pipe schedule. Values in mm.
| NPS | OD | 90° LR elbow A | 45° elbow B | Tee C | Reducer H | Cap E |
|---|---|---|---|---|---|---|
| ½" | 21.3 | 38 | 16 | 25 | — | 25 |
| 1" | 33.4 | 38 | 22 | 38 | 51 | 38 |
| 1½" | 48.3 | 57 | 29 | 57 | 64 | 38 |
| 2" | 60.3 | 76 | 35 | 64 | 76 | 38 |
| 3" | 88.9 | 114 | 51 | 86 | 89 | 51 |
| 4" | 114.3 | 152 | 64 | 105 | 102 | 64 |
| 6" | 168.3 | 229 | 95 | 143 | 140 | 89 |
| 8" | 219.1 | 305 | 127 | 178 | 152 | 102 |
| 10" | 273.1 | 381 | 159 | 216 | 178 | 127 |
| 12" | 323.9 | 457 | 190 | 254 | 203 | 152 |
Full chart to 24": ASME B16.9 fitting dimensions.
Six-digit Harmonized System heading (iron and steel, chapter 72–73). Your country adds its own digits — confirm with your customs broker. All HS codes.
ASTM A106 Gr B Pipe Fittings Price — What Decides It
Two quotes for "A106 B pipe fittings" can differ by 20% and both be fair. We quote A106 B pipe fittings per kg for full sizes and per piece for cut sizes. These six things move the price per kg, so you can compare offers like for like.
ASTM A106 Gr B pipe fittings by type
ASTM A106 Gr B Pipe Fittings Applications
ASTM A106 Gr B is specified when the cheaper grade will not survive the service but a higher alloy would be more than the job needs. These are the jobs our buyers use it for.
How your A106 B pipe fittings order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked against your order; PMI can be arranged depending on product and requirements, as specified in the PO.
- 03Processing — cutting, machining or bevelling to your specification, with heat numbers marked as specified in the PO.
- 04Inspection — your third-party inspector witnesses, or we share photos and test reports.
- 05Packing & dispatch — seaworthy packing from Nhava Sheva (JNPT), Mumbai, FOB or CIF, documents sent before the vessel sails.
Standards on this page
Welding & Fabricating ASTM A106 Gr B Pipe Fittings
ASTM A106 Gr B welds by all common arc processes. A few points our buyers ask about:
| Matching filler | ER70S-6 / E7018 |
|---|---|
| Over-alloyed filler | Preheat thick walls per the WPS |
| Preheat | As required by the WPS and code for the thickness |
| Cutting | Thermal or abrasive cutting; grind off heat-tinted edges before welding |
Follow your approved WPS; this is general guidance. See also A106 B fittings and A106 B flanges for the matching pipe-system parts.
How to Order ASTM A106 Gr B Pipe Fittings: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Fitting type, size and schedule / class
- Buttweld, socket weld or threaded
- Seamless or welded (buttweld fittings)
- Material standard and grade marking
- Certificate type and extra tests
- Delivery port, Incoterm and required date
ASTM A106 Gr B pipe fittings — questions buyers ask
Is ASTM A106 Gr B the same as SA-106 Gr B?
SA-106 Gr B, Seamless carbon steel pipe, UNS K03006 are names used for ASTM A106 Gr B, and pipe fittings is ordered to ASTM A234 WPB whichever name is on the enquiry.
Which standard covers ASTM A106 Gr B buttweld fittings?
ASTM A234 WPB is the material specification; dimensions follow ASME B16.9 (and MSS SP-43 for light-wall fittings). Forged socket-weld and threaded fittings are made from ASTM A105 material to ASME B16.11.
What is the difference between ASTM A106 Gr B WP-S and WP-W fittings?
Seamless fittings are made from seamless pipe or bar; welded fittings are formed from plate or welded pipe. State which you need and the weld examination required.
Can ASTM A106 Gr B fittings be welded to carbon steel?
Yes — matching carbon or low-alloy filler is used; joints to stainless need ER309L.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026