ALLOY 21-6-9 • UNS S21900

ALLOY 21-6-9 • UNS S21900

ALLOY 21-6-9 • UNS S21900 21Cr-6Ni-9Mn is a high manganese nitrogen strengthened, austenitic stainless steel. It combines high strength in the annealed condition, excellent resistance to oxidation at high temperatures as well as good resistance to lead oxide and a high level of corrosion...
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Product Details

ALLOY 21-6-9 • UNS S21900

21Cr-6Ni-9Mn is a high manganese nitrogen strengthened, austenitic stainless steel. It combines high strength in the annealed condition, excellent resistance to oxidation at high temperatures as well as good resistance to lead oxide and a high level of corrosion resistance at ambient temperatures. The alloy can be fabricated and formed much the same as type 304 and 316, and is readily wieldable. It remains nonmagnetic after severe cold work.

Available Tube Product form

Straight

Seam welded and cold redrawn

Seam welded, cold redrawn and annealed


Typical Applications

Aircraft hydraulic tubes

Aircraft engine components


Industries predominantly using this Grade

Aerospace


Typical Manufacturing Specifications

AMS 5561

Also individual customer specifications.


Mechanical Properties

TemperAnnealed
Cold-worked
Tensile Rm

95

ksi (min)

142

ksi (min)

Tensile Rm

655

MPa (min)

979

MPa (min)

R.p. 0.2% Yield

48

ksi (min)

120

ksi (min)

R.p. 0.2% Yield

330

MPa (min)

827

MPa (min)

Elongation (2” or 4D gl)

35

% (min)

20

% (min)


Physical Properties (Room Temperature)

Specific Heat (0-100°C)

500

J.kg-1.°K-1

Thermal Conductivity

14

W.m -1.°K-1

Thermal Expansion

16.7

μm/μm/°C

Modulus Elasticity

19.6

GPa

Electrical Resistivity

73

μohm/cm

Density

7.83

g/cm3


Chemical Composition (% by weight)

ElementMinMax

C

-

0.08

Mn

8

10

Ni

5.5

7.5

Cr

19

21.5

Fe

Balance


Mo

1.5

3

N

0.15

0.4

Si

-

1

P

-

0.06

S

-

0.03


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