Alloy 31

Introduction:-

Alloy 31 is a nickel, chromium, and molybdenum stainless steel with nitrogen and copper additions. It combines moderate tensile strength and high ductility with excellent corrosion resistance in sulfuric acid, reducing and oxidizing media and has a strong resistance to corrosion and erosion-corrosion in the phosphoric environment.

Typically the alloy has PREN of ≥ 48, which ensures that the resistance to pitting corrosion is high.

Applications for Alloy 31:-

Used in f.ex pulp and paper industry, flue gas desulphurization – FGD – systems, seawater heat exchangers, petroleum production and refining industry, mining industry, ore processing, etc.

Heat Treatment

Solution annealing at min 1150°C followed by water quenching.

Weldability

Very good.

Chemical Composition of Alloy 31:-

Weight % C SI MN S P CR NI MO N CU
MIN.  26,0  30,0  6,0  0,15  1,0
MAX.  0,015  0,3  2,00  0,010  0,020  28,0  32,0  7,0  0,25  1,4

Mechanical Properties of Alloy 31:-

Yield streng
RP0.2, MPA
Tensile strength

RM, MPA

Elongation

[%]

Hardness

[HB]

Impact, Charpy-V, -196ºC

[J]

Pre
 ≥ 276  ≥ 650  ≥ 40  ≥ 140  ≥ 48

Plate Stock for Alloy 31:-

MEASUREMENTS KG/PLATE
3 X 2000 X 8000 MM 408
5 X 2000 X 8000 MM 680

 

 

Alloy 31 Avaliability

Alloy 31 Specifications

Alloy 31 Tensile Requirements