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Alloy 31

Designated as UNS N08031 or DIN W.Nr. 1.4562, Alloy 31 is an iron-nickel-chromium-molybdenum alloy with nitrogen and copper additions which has hybridized properties of austenitic super stainless steels and regular nickel alloys. Alloy 31 has exceptional corrosion resistance to alkaline & halide-containing media, sulfuric acid, phosphoric acid, chlorine dioxide media, nitric acid as well as reducing & oxidizing medias. It is widely used in offshore & marine industries, chemical & petrochemical processing, pharmaceutical piping, oil and gas extraction, and ore digestion plants. Especially, Alloy 31 can be used for the fabrication of pressure vessels which may endure a wide temperature-range from cryogenic level to elevated temperatures(-196°C to 550 °C).

Alloy 31 gate valves with mating flanges

Forged gate valves, RF flanged with mating weld neck flanges and extended bonnet. Material: Alloy 31 (UNS N08031).

1. Chemical Composition Requirements

The Chemical Composition of Alloy 31, %
Nickel30.0-32.0
Chromium26.0-28.0
IronBalance
Sulfur≤0.010
Si≤0.30
Manganese≤2.00
Phosphorus≤0.020
molybdenum6.0-7.0
Copper1.0-1.4
Nitrogen0.15-0.25
Carbon≤0.015

2. Physical Properties of Alloy 31

DensityMelting RangePermeabilityElectrical Resistivity
g/cm3lb/in3°C°F@20°CµΩ·m
8.050.2901330-13702426-24981.001104

3. Mechanical Properties of Alloy 31

Alloy 31 90° elbows L/R 16" SCH120, ASTM B366 UNS N08031.

Alloy 31 elbows 90° L/R 16″ SCH120, ASTM B366 UNS N08031.

Tensile Strength, min.Yield Strength, min.Elongation, min.Hardness, min
MpaksiMpaksi%HB
650952774140220

4. Product Forms and Standards

Product FormStandard
Plate, sheet and stripASTM B625
Rod, bars and wireASTM B581, B649
Forged flanges & forged fittingsASTM B564, B462
Welded fittingsASTM B366

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    Hebei Metals Industrial Limited
    (Shijiazhuang Metalsin Pipeline Tech Co., Ltd)
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    Tel: +86-311-89642206
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    Email: sales@metalspiping.com