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Chemical Composition

Identification Symbol UNS Number Grade Elements Composition %
Alloy 255 S32550 26 chromium, 6 nickel,
3.5 molybdenum with
nitrogen and copper
255
Carbon 0.040 max
Manganese 1.50 max
Phosphorus 0.040 max
Sulfur 0.030 max
Silicon 1.00 max
Nickel 4.5 - 6.5
Chromium 24.00 - 27.00
Molybdenum 2.9 - 3.9
Copper 1.50 - 2.50
Nitrogen 0.10 - 0.25

Mechanical Properties

PropertyValue
Tensile Strength, min, ksi [MPa] 109 [750]
Yield Strength, min, ksi [MPa] 80 [550]
Elongation in 2 in. [50mm] or 4D, min, % 25
Reduction or Area, min, % 50
Brinell Hardness Number, HBW --