MATERIAL DESCRIPTION

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 strong resistance to corrosion and erosion corrosion in phosphoric environment.

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

APPLICATIONS

Used in f.ex pulp and paper industry, flue gas desulphurization – FGD – systems, sea water 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

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

PREN = (Cr% + 3.3Mo% + 16N%) ≥ 48.
Product Standards: ASTM B625 – 14.
Approvals: For usage in pressure vessels with wall temperatures between -196°C to 550°C.

Mechanical Properties: BAR

Yield strength
RP0.2, MPA
Tensile strength
RM, MPA
Elongation
[%]
Hardness
[HB]
Impact, Charpy-V, -196ºC
[J]
Pre
 ≥ 276  ≥ 650  ≥ 40  ≥ 140  ≥ 48

PLATE STOCK

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