ASTM A420 WPL6 / WPL3 Low-Temperature Pipe Fittings
Teshi Group manufactures ASTM A420 WPL6 / WPL3 Low-Temperature pipe fittings (LTCS fittings, A420 WPL6, A350 LF2 forged fittings) as an OEM in India — butt weld fittings to ASME B16.9 and forged socket weld and threaded fittings to ASME B16.11, with heat-number traceability on every piece.
Carbon steel covers most piping by volume: A105 for general service, A350 LF2 and LF3 where impact toughness is needed at low temperature, and A694 high-yield grades matched to API 5L line pipe.
ASTM A420 WPL6 / WPL3 Low-Temperature pipe fittings at a glance
| Material | ASTM A420 WPL6 / WPL3 Low-Temperature |
|---|---|
| Specification | Butt weld: ASTM A420 WPL6 / ASTM A420 WPL3 · Forged: ASTM A350 LF2 Cl.1 / ASTM A350 LF3 |
| UNS / W.Nr. | K03011 / ~1.0566 · K32025 / — |
| Sizes | Butt weld NPS ½"–48", Sch 5S–XXS · Forged NPS ⅛"–4" |
| Pressure class | Wall to pipe schedule (B16.9) · Class 2000, 3000, 6000, 9000 (B16.11) |
| Facing / ends | Bevelled ends to ASME B16.25; socket weld and NPT threaded ends |
| Certification | EN 10204 3.1 standard · 3.2 with third-party inspection · IBR on request |
| Testing | PMI, hardness, dimensional; UT, IGC, impact and ferrite as specified |
ASTM A420 WPL6 / WPL3 Low-Temperature chemistry and mechanical properties
Chemical composition of ASTM A420 WPL6 / WPL3 Low-Temperature (weight %, maximum unless a range)
| Grade | C | Mn | Si | P | S | Ni |
|---|---|---|---|---|---|---|
| A350 LF2 Cl.1 | 0.30 | 0.60–1.35 | 0.15–0.30 | 0.035 | 0.040 | — |
| A350 LF3 | 0.20 | 0.90 | 0.20–0.35 | — | — | 3.3–3.7 |
Mechanical properties of ASTM A420 WPL6 / WPL3 Low-Temperature (minimum, room temperature)
| Grade | Tensile strength | Yield strength (0.2 %) | Elongation | Note |
|---|---|---|---|---|
| A350 LF2 Cl.1 | 485 MPa (70 ksi) | 250 MPa (36 ksi) | 22 % | Charpy at −46 °C |
| A350 LF3 | 485 MPa (70 ksi) | 260 MPa (38 ksi) | 22 % | Charpy at −101 °C |
Matching specifications by product form
| Grade | Forged flanges & fittings | Butt weld fittings | Plate | Pipe |
|---|---|---|---|---|
| A350 LF2 Cl.1UNS K03011 · W.Nr. ~1.0566 | ASTM A350 LF2 Cl.1 | ASTM A420 WPL6 | ASTM A516 Gr 70 | ASTM A333 Gr 6 |
| A350 LF3UNS K32025 · W.Nr. — | ASTM A350 LF3 | ASTM A420 WPL3 | ASTM A203 | ASTM A333 Gr 3 |
Limits and minimums from the governing ASTM / ASME specifications, summarised for convenience; the current edition takes precedence.
Pressure rating
Butt weld fittings carry the same pressure rating as straight seamless pipe of the same material and wall thickness, so the fitting schedule is matched to the line pipe (ASME B16.9). Forged socket weld and threaded fittings are rated by class — 3000 and 6000 for socket weld, 2000, 3000 and 6000 for threaded — per ASME B16.11.
Types we manufacture
Dimension charts
Where ASTM A420 WPL6 / WPL3 Low-Temperature is used
- General refinery, process and utility piping (A105N)
- LNG, ammonia and low-temperature service (LF2, LF3)
- Oil and gas transmission pipelines (A694)
- Steel plant water, air and gas mains
- Boiler and steam service with IBR certification
Testing & certification
- Normalising where specified (A105N)
- Carbon equivalent limit (e.g. CE ≤ 0.43) when the project specifies it
- Charpy V-notch impact testing for LF grades
- Hardness, dimensional and visual inspection
- IBR certification when specified
Related materials
FAQ
ASTM A420 WPL6 / WPL3 Low-Temperature pipe fittings: common questions
What specification covers ASTM A420 WPL6 / WPL3 Low-Temperature pipe fittings?
ASTM A420 WPL6 / WPL3 Low-Temperature butt weld fittings are made to ASTM A420 WPL6 / ASTM A420 WPL3 with dimensions to ASME B16.9; forged socket weld and threaded fittings are made to ASTM A350 LF2 Cl.1 / ASTM A350 LF3 with dimensions to ASME B16.11.
What is the chemical composition of A350 LF2 Cl.1?
A350 LF2 Cl.1 (UNS K03011): C 0.30, Mn 0.60–1.35, Si 0.15–0.30, P 0.035, S 0.040 (weight %; single values are maximums).
What are the minimum mechanical properties of A350 LF2 Cl.1?
Tensile strength 485 MPa (70 ksi), yield strength 250 MPa (36 ksi), elongation 22 %.
Is Teshi Group a manufacturer of ASTM A420 WPL6 / WPL3 Low-Temperature pipe fittings in India?
Yes. Teshi Group has manufactured flanges and fittings in India since 1971 and is ISO 9001:2015 certified and IBR approved. Every ASTM A420 WPL6 / WPL3 Low-Temperature piece is hard-stamped with its heat number and supplied with an EN 10204 3.1 certificate; 3.2 with third-party inspection on request.
What is the difference between A105 and A105N?
A105N is A105 supplied in the normalised condition, which refines the grain and improves toughness. Many project specifications require A105N.
At what temperature is A350 LF2 impact tested?
A350 LF2 Class 1 is Charpy impact tested at −46 °C (−50 °F); LF3 is tested at −101 °C (−150 °F).
Low-temperature carbon steel (LTCS) grade data sheets
Low-temperature carbon steel (LTCS) overview →Chemical composition, mechanical properties and PDF data sheet for each grade.
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