ASTM A333 Gr 6 Pipe FittingsASTM A420 WPL6 · Manufacturer, trader & exporter, India
Also sold as SA-333 Gr 6 · Low-temperature carbon steel pipe · LTCS
ASTM A333 Gr 6 pipe fittings are made to ASTM A420 WPL6 for buttweld fittings and ASTM A350 LF2 for forged socket-weld and threaded fittings, with dimensions to ASME B16.9 and B16.11. It is a low-temperature carbon steel pipe, impact-tested to −45 °C, chosen for cold-climate and refrigerated piping down to −45 °C. 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 A333 Gr 6 Pipe Fittings?
ASTM A333 Gr 6 pipe fittings is a low-temperature carbon steel pipe, impact-tested to −45 °C supplied as pipe fittings to ASTM A420 WPL6. Buyers specify it for cold-climate and refrigerated piping down to −45 °C. It is also sold as SA-333 Gr 6, Low-temperature carbon steel pipe, LTCS.
- What it is
- Low-temperature carbon steel pipe, impact-tested to −45 °C
- Buttweld
- ASTM A420 WPL6
- Forged
- ASTM A350 LF2
- Dimensions
- ASME B16.9 · B16.11 · MSS SP-43
- Sizes
- Buttweld ½" – 48" · forged ⅛" – 4"
- Best at
- Cold-climate and refrigerated piping down to −45 °C
ASTM A333 Gr 6 Pipe Fittings Specification & Sizes
| Buttweld fittings | ASTM A420 WPL6 — dimensions to ASME B16.9, MSS SP-43 |
|---|---|
| Forged fittings | ASTM A350 LF2 — 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 A333 Gr 6 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 A333 Gr 6, buttweld fittings are ASTM A420 WPL6 and forged fittings ASTM A350 LF2.
ASTM A333 Gr 6 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 |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A333 Grade 6.
ASTM A333 Gr 6 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 |
| Charpy impact | 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 A333 Grade 6 — condition per order.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting range | 1420 – 1530 °C |
| Magnetic | Magnetic |
ASTM A333 Gr 6 Equivalent Grades
ASTM A333 Gr 6 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 A333 Gr 6 Pipe Fittings Price — What Decides It
Two quotes for "A333 Gr 6 pipe fittings" can differ by 20% and both be fair. We quote A333 Gr 6 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 A333 Gr 6 pipe fittings by type
ASTM A333 Gr 6 Pipe Fittings Applications
ASTM A333 Gr 6 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 A333 Gr 6 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 A333 Gr 6 Pipe Fittings
ASTM A333 Gr 6 welds by all common arc processes. A few points our buyers ask about:
| Matching filler | E7018-1 / ER80S-Ni1 |
|---|---|
| Over-alloyed filler | Impact-tested procedure required |
| 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 A333 Gr 6 fittings and A333 Gr 6 flanges for the matching pipe-system parts.
How to Order ASTM A333 Gr 6 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 A333 Gr 6 pipe fittings — questions buyers ask
Is ASTM A333 Gr 6 the same as SA-333 Gr 6?
SA-333 Gr 6, Low-temperature carbon steel pipe, LTCS are names used for ASTM A333 Gr 6, and pipe fittings is ordered to ASTM A420 WPL6 whichever name is on the enquiry.
Which standard covers ASTM A333 Gr 6 buttweld fittings?
ASTM A420 WPL6 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 A350 LF2 material to ASME B16.11.
What is the difference between ASTM A333 Gr 6 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 A333 Gr 6 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