|
Alloy |
UNS Number |
SAE Number |
|
SS 329 |
UNS S32900 |
GENERAL PROPERTIES
329 is a stainless, acid resistant, duplex steel with improved machinability. Since the steel is machinability improved, it is suitable for production of details with comprehensive machining.
The steel has very good corrosion resistance particularly in chloride-bearing environments and is extra resistant to pitting corrosion, crevice corrosion, stress corrosion cracking and corrosion fatigue. It also has high strength and toughness.
RESISTANCE TO CORROSION
Duplex stainless steels are extremely corrosion resistant. They have high resistance to intergranular corrosion. Even in chloride and sulphide environments, duplex stainless steels exhibit very high resistance to stress corrosion cracking.
The super duplex grades are even more resistant to corrosion.
PHYSICAL PROPERTIES
|
Melting Point |
Density |
Specific Gravity |
Modulus of Elasticity |
|
1450 – 1510 ℃ |
7.8g/cm3 |
7.8 |
200 GPa |
MECHANICAL PROPERTIES
|
Alloy |
Tensile Strength |
Yield Strength |
% Elongation |
|
SS 329 |
10,500 |
79,800 |
25 |
CHEMICAL PROPERTIES
|
Alloy |
C |
Si |
Mn |
P |
Cr |
Ni |
S |
Fe |
|
SS 329 |
0.08 |
0.75 |
1.0 |
0.04 |
23.0-28.0 |
2.5-5.0 |
0.03 |
Bal |
WELDING
Successfully welded by common fusion and resistance methods, this alloy should not be joined by oxyacetylene welding.
AWS E/ER630 filler metal is recommended if required.
HEAT TREATMENT
CONDITION A--Soak at 1900 F (1038 C) for 30 minutes and cool below 60 F (16 C) for complete martensite transformation.
CONDITION H 950- Treat Condition A material at 900 F(482 C) for 1 hour, air cool.. CONDITION H925, H1025, H1075,
H1100, H1150- Soak solution treated material for 4 hours at specified temperature, air cool, CONDITION H1150M- Soak
solution treated material at 1400 F (760 C) for 2 hours, air cool, then re-heat to 1150 F (620 C) for 4 hours and air cool.
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