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439

Type 439 (also known as ASTM XM-8) is a ferritic stainless steel designed to resist corrosion in a variety of oxidizing environments from fresh water to boiling acids.

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439 stainless steel
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439
SUS439
X6CrTi17
1.4510
022Cr18Ti

Chemical Composition

The typical chemical composition is shown in the table below.

Grade
Standard
439 Chemical Composition
C
Si
Mn
Cr
Ni
P
S
Mo
Others
≤ %
≤ %
%
%
%
≤ %
≤ %
≤ %
%
439
ASTM A240
0.03
1
1
17 - 19
0.5
0.04
0.03
-
-
1.451
EN 10088-2
0.05
1
1
16 - 18
-
0.04
0.015
-
Ti: 0.15 - 0.8 | N≤ 0.03
SUS439
JIS G 4304 | JIS G 4305
0.03
0.75
1
16 - 19
-
0.04
0.03
-
Ti: 0.1 - 1.0

Mechanical Properties

The mechanical properties are given in the table below.

Grade
Standard
439 Mechanical Properties
Tensile Strength
Yield Strength 0.2%
Elongation >%
Hardness
(MPa) ≥
(MPa) ≥
HRB ≤
HB ≤
439
ASTM A240
415
205
22
89
183
1.451
EN 10088-2
420
230
23
-
-
SUS439
JIS G 4304 | JIS G 4305
360
175
22
88
183

Properties & Typical Applications

Type 439 is a titanium stabilised 18% chromium alloy that can be used in many oxidising environments.Type 439 does not require annealing after welding to restore ductility or to provide intergranular corrosion resistance. Type 439 also has superior formability capabilities and is heavily used in the automotive industry; it can be work hardened slightly to increase tensile strength.

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