ASTM A420 Grade WPL6 Carbon Steel – Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
This specification covers wrought carbon steel and alloy steel pipe fittings of seamless and welded construction for use in pressure piping and pressure vessel service at low temperatures. Materials shall consist of forgings, bars, plates, seamless or fusion welded tubular products with filler metal added, and shall be produced by open-hearth, basic-oxygen, or electric-furnace process.Forging or forming operations shall be performed by one or a combination of two or more of the following procedures: hammering, pressing, piercing, extruding, upsetting, working, bending, fusion-welding, or machining. All welding shall be completed prior to the austenitizing heat treatment, which shall be executed in the normalized, normalized and tempered, annealed, or quenched and tempered conditions. Steel specimens shall conform to required values of chemical composition, tensile strength, yield strength, elongation, wall thickness, and Charpy V-notch impact value. All fusion-welded butt joints shall undergo radiographic examination, while hydrostatic testing of fittings is not required in this specification. Repair welding shall be permissible for parts made to dimensional standards.
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A420 WPL3/WPL6 Fittings Specifications
Grade Specification | Carbon Steel: ASTM/ASME A234 WPB / A860 – MSS-SP-75 WPHY 42 / 46 / 52 / 56 / 60 / 65 / 70 Low temperature Steel: A420 WPL3 / A420 WPL6 |
Type | Seamless / Welded / Fabricated |
Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
Range | ½" NB to 48" NB in Sch 10s, 40s, 80s, 160s, XXS. |
Dimensions | ANSI/ASME B16.9, B16.28, MSS-SP-43. |
Applicable Standards | 1-ASME B 16.9 for large Bore 2-ASME B 16.11 for small Bore (socket welded) 3-ASME B 16.25 for butt weld ends 4-ASME B 16.28 for small radius elbow |
Seamless/ Welded 100% Radiography Tested |
Standard | Description |
ASTM A182/A182M | Forged or rolled alloy steel pipe flanges, forged fittings and valve and parts for high temperature service. Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings |
ASTM A403/A403M | Wrought austenitic stainless steel piping fittings. |
ASTM A815/A815M | Wrought ferritic, ferritic/austenitic and martensitic stainless steel piping fittings. |
AS 2129 | Flanges for pipes, valves and fittings |
ANSI/ASME B1.20.1 | Pipe threads, general purpose (inch). |
ANSI B16.5 | Steel pipe flanges and flanged fittings. |
ANSI B16.9 | Factory-made wrought steel butt-welding fittings. |
ANSI B16.11 | Forged steel fittings socket-welding and threaded. Socket Welding and Threaded Forged Fittings |
ANSI B16.25 | Butt-welding ends. |
MSS SP43 | Wrought stainless steel butt-welding fittings. Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications |
BS21 | Threading. |
ISO 4144 | Stainless steel fittings threaded to ISO 7-1. |
MSS SP-95 | Swage(d) Nipples and Bull Plugs |
BS3799 | Specification for Steel pipe fittings, screwed and Socket-welding for the petroleum industry |
ANSI – B 16.9 ASTM A403 ASME SA403 | Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings |
API 590-605 ASME B16.9 | Factory-Made Wrought Buttwelding Fittings |
ASME B16.25 | Buttwelding Ends |
ASME B16.28 | Wrought Steel Buttwelding Short Radius Elbows and Returns |