ASTM A420 WPL6 Specification for Butt Weld Fittings

ASTM A420 WPL6 Butt Weld Fittings Specification PDF

The ASTM A420 WPL6 Butt Weld Fittings Specification PDF provides a comprehensive technical reference for wrought carbon steel butt weld fittings intended for low-temperature service. This specification covers chemical composition, mechanical properties, impact testing requirements, manufacturing process, dimensions and tolerances, inspection, and typical applications in low-temperature and cryogenic piping systems.

ASTM A420 Standard Overview

ASTM A420 is the standard specification for wrought carbon steel and alloy steel piping fittings designed for low-temperature service. Fittings manufactured in accordance with ASTM A420 are required to maintain adequate notch toughness and impact resistance at subzero operating temperatures.

Grade WPL6 is the most commonly specified grade under ASTM A420 and is widely used in oil & gas, LNG, and low-temperature pressure piping systems.

Material Grade: ASTM A420 WPL6

  • Standard: ASTM A420

  • Grade: WPL6

  • Material Type: Carbon Steel for Low-Temperature Service

  • Product Form: Butt Weld Pipe Fittings

  • Typical Impact Test Temperature: −46°C (−50°F)

ASTM A420 WPL6 butt weld fittings are engineered to provide reliable toughness and ductility in cold environments where standard carbon steel fittings may become brittle.

Chemical Composition (Typical, %)

  • Carbon (C): ≤ 0.30

  • Manganese (Mn): 0.60 – 1.35

  • Phosphorus (P): ≤ 0.035

  • Sulfur (S): ≤ 0.040

  • Silicon (Si): ≤ 0.40

Chemical composition limits are defined by ASTM A420 for Grade WPL6.

Mechanical Properties

  • Tensile Strength: 485 – 655 MPa

  • Yield Strength: ≥ 240 MPa

  • Elongation: ≥ 22%

  • Impact Testing: Charpy V-notch test as specified by ASTM A420

These properties ensure safe and stable performance in low-temperature pressure piping applications.

Manufacturing Requirements

ASTM A420 WPL6 butt weld fittings are manufactured by hot forming or cold forming processes, followed by appropriate heat treatment as required by the specification. All fittings must meet the impact toughness and mechanical requirements defined in ASTM A420.

ASTM A420 WPL6 Butt Weld Fittings Product Scope

  • Elbows (45°, 90°, 180° – Long Radius and Short Radius)

  • Tees (Equal and Reducing)

  • Reducers (Concentric and Eccentric)

  • Caps

  • Stub Ends

  • Custom Fabricated Butt Weld Fittings

Dimensional standards commonly applied include ASME B16.9, ASME B16.28, and MSS SP-43.

Dimensions & Tolerances

Dimensions of ASTM A420 WPL6 butt weld fittings are governed by applicable ASME or MSS dimensional standards. Key dimensional controls include center-to-end dimensions, wall thickness matching pipe schedule, outside diameter tolerance, bevel angle, and end preparation for proper butt welding fit-up.

Testing & Inspection

Each ASTM A420 WPL6 butt weld fitting may be subjected to:

  • Chemical analysis

  • Mechanical testing

  • Charpy V-notch impact testing

  • Non-destructive testing (if specified)

  • Dimensional and visual inspection

Mill Test Certificates (EN 10204 3.1) are typically supplied.

Applications

  • Low-Temperature Piping Systems

  • Oil & Gas Pipelines

  • LNG & Cryogenic Facilities

  • Petrochemical Plants

  • Refineries.

Download ASTM A420 WPL6 Butt Weld Fittings Specification PDF

Click below to download the complete ASTM A420 WPL6 Butt Weld Fittings Specification PDF, including chemical composition limits, mechanical requirements, impact testing criteria, and dimensional references.

👉 Download astm_a420_wpl6_butt_weld_fittings_specification pdf

👉 Download ASTM A420 standard Specification PDF

FAQ

Q: what is astm a420 wpl6 used for?
a: it is used for low temperature service piping systems requiring impact toughness, commonly in lng/lpg and cryogenic applications.

Q: do you provide charpy impact test for wpl6 fittings?
a: impact testing can be provided according to astm a420/asme sa420 ,ASTM A370 and project requirements.

Q: can you supply en 10204 3.2 certificate?
a: 3.2 documentation is available upon request with third-party witnessing/verification.

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