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astm a420 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.
bestar can provide all the four steel grades covered by astm a420: wpl6, wpl9, wpl3, and wpl8.1.
astm a420 chemical composition requirements
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.
2. astm a420 mechanical properties
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 |
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