439, a titanium stabilized, 18 percent chromium alloy, is also
known as ASTM XM-8
and by the UNS designation S43035, is a ferritic stainless steel
designed to resist corrosion
in a variety of oxidizing environments from fresh water to boiling
acids.
It may be used in either the annealed, cold formed or as-welded
condition in many applications
where other stainless steel alloys such as Type 304, Type 410, Type
409 and Type 430 are used.
439 stainless may also be used in many oxidizing environments where
Type 304 is considered
adequate in terms of general corrosion resistance but is subject to
chloride stress corrosion cracking.
The composition of 439 stainless steel has been balanced to provide
a completely
ferritic structure at all temperatures, to avoid the loss of
ductility after welding and to provide
resistance to intergranular corrosion.
Similar ferritic stainless steels such as 430 and 434 alloys are
susceptible to brittle
martensite formation after welding and to intergranular corrosion
sensitivity in the as-welded condition.
439 stainless does not require annealing after welding to restore
ductility or to provide
intergranular corrosion resistance.
Excellent resistance to stress corrosion cracking, good
weldability, high thermal conductivity
and low thermal expansion characteristics make 439 stainless steel
an ideal consideration
for many applications. For shell and tube heat exchangers where
carbon steel shells are
used with 439 tubes, the close match of thermal expansion coefficients may possibly
eliminate
the need for an expansion joint in the heat exchanger. 439 stainless has a low cobalt content,
compared to Type 304, making it an attractive consideration for nuclear applications.
When aplication temperatures are too high for 409 stainless, 439
stainless provides good oxidation
and corrosion resistance for many automotive exhaust system
components and residential furnace primary heat exchangers.
Chemical composition of stainless 439
| Grade | C | Si | Mn | P | S | Cr | Ti |
| 439 | 0.070 | 1.00 | 1.00 | 0.040 | 0.030 | 17.00~19.00 | ≥ 0.20+4(C+N)min - 0.50 max |
Typical annealed state mechanical properties
| Tensile strength | Yiled strength | Elongation | Hardness |
| 455 | 290 | 34 | 78 HB |
Product forms
Hot-rolled wide strip, cold-rolled wide strip, slit strip, cut
sheets, precision strip
We stock 439 hot and cold rolled stainless steel sheet, plate,
strip and coil.
For Details, please Contact
WUXI GUANGLU Special Steel Co., Ltd.
Stainless martensitic • precipitation hardening steel • stainless
ferritic — Our answer to your needs
Tel: +86 510 81812873
Email: export@guanglusteel.com
