ASTM A420/A420M

ASTM A420 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service.

ASTM A420 WPL6 Elbow

ASTM A420/A420M 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.

Chemical Composition (%) of ASTM A420

Elements WPL6, % WPL9, % WPL3, % WPL8, %
Carbon [C] ≤0.30 ≤0.20 ≤0.20 ≤0.13
Manganese [Mn] 0.50-1.35 0.40-1.06 0.31-0.64 ≤0.90
Phosphorus [P] ≤0.035 ≤0.030 ≤0.05 ≤0.030
Sulfur [S] ≤0.040 ≤0.030 ≤0.05 ≤0.030
Silicon [Si] 0.15-0.40 0.13-0.37 0.13-0.37
Nickel [Ni] ≤0.40 1.60-2.24 3.2-3.8 8.4-9.6
Chromium [Cr] ≤0.30 ... ... ...
Molybdenum [Mo] ≤0.12 ... ... ...
Copper [Cu] ≤0.40 0.75-1.25
Columbium [Cb] ≤0.02 ... ... ...
Vanadium[V] ≤0.08 ... ... ...


*For grade WPL6, the limit for Columbium may be increased up to 0.05% on heat analysis and 0.06% on product analysis.

*Fittings of WPL3 made from plate or forgings may have 0.90 % max manganese.

*Fittings of WPL8 made from plate may have 0.98 % max manganese.

Mechanical properties of ASTM A420

ASTM A420/ A420M Tensile Strength, min. Yield Strength, min. Elongation %, min
Grade ksi MPa ksi MPa Longitudinal Transverse
WPL6 65-95 415-655 35 240 22 12
WPL9 63-88 435-610 46 315 20
WPL3 65-90 450-620 35 240 22 14
WPL8 100-125 690-865 75 515 16

*All the elongation values are on the basis of standard round specimen, or small proportional specimen, min % in 4 D.

ASTM A234 is Standard Specification for steel pipe fittings includes carbon and alloy steel material for moderate and high temperature services.

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.