Alloy 31

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alloy 31 grade alloy 31 uns n08031
Alloy 31 Sheets
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Alloy 31 UNS N08031 Pipes

Seamless nickel alloy monel inconel incoloy hastelloy nimonic steel pipe tube pipes tubes tubing

size 1/2``~4`` or 1/8''~10''
thickness SCH5S~XXS
Pipe end PE BE
Seamless or welded
Lead time: 10~15days
nickel 200 201
alloy 20 31 20cb3 6xn 901
monel alloy 400 k500 k-500 404
inconel alloy 600 625 718 601 x750 x-750
incoloy alloy 800 800h 800ht 825 925 25-6mo
hastelloy alloy B B-2 B-3 C-4 C-22 C-276 X C-2000
Hastelloy b2 b3 c4 c22 c276 c2000
nimonic 80a 90 263
UNS N06600 N06690 N06625 N08825 N08904 N08800 N04405 N10276 N02200 N02201 N04400 N08020 N08031 N07718 N07750 N05500 N06601 N08810 N08811 N08925 N10001 N10665 N10675 N06002 N06200 N06455 N06022 N06030 N09901 N08367 etc
Packing Bundle, steel strip, wooden case, woven bags, etc

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 Alloy 31 is an iron-nickel-chromium-molybdenum alloy with nitrogen addition. It has a pitting resistance in high chloride environments between those of super-austenitic stainless steels and nickel alloys. The alloy has very good corrosion resistance in mixed acid and high chloride environments. The material is approved in ISO 15156/ NACE MR0175 to test level VI for sour gas service.

Available tube product forms

  • Straight
  • Coiled
  • Seamless
  • Seam welded and cold redrawn
  • Seam welded, cold redrawn and annealed

Typical Applications

  • Control lines
  • Control and instrumentation tubes
  • Heat exchangers

Typical manufacturing specifications

  • ASTM B626
  • ASTM B622
  • Also individual customer specifications.

Industries predominantly using this grade            

  • Chemical processing
  • Oil and gas

TECHNICAL DATA

Mechanical Properties

Temper Annealed
Tensile Rm 94 ksi (min)
Tensile Rm 650 MPa (min)
R.p. 0.2% Yield 41 ksi (min)
R.p. 0.2% Yield 280 MPa (min)
Elongation (2.02 or 4D gl) 40 % (min)


Physical Properties (Room Temperature)

Specific Heat (0-100°C) 452 J.kg-1.°K-1
Thermal Conductivity 11.7 W.m -1.°K-1
Thermal Expansion 18.1 mm/m/°C
Modulus Elasticity 198 GPa
Electrical Resistivity 1.03 μohm/cm
Density 8.61 g/cm3


Chemical Composition (% by weight)

Element Min Max
C - 0.0015
Si - 0.3
Mn - 2
P - 0.02
S - 0.01
Cr 26 28
Cu 1 1.4
Fe Balance
Mo 6 7
N 0.15 0.25
Ni 30 32


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