A890 7A
ASTM:
A890 7A
ASME:
SA890 7A
Alloy Family:
Type:
27Cr-7Ni-Mo-W-N
Designation:
ACI:
CD3MWN
AISI:
SAE:
UNS - Cast:
J93379
UNS - Wrought:
Common Name - Wrought:
Alloy Casting Statistics
Pounds Poured in 2021
Resources
Frequently Asked Questions
01
Q. What is duplex stainless steel?
A. Duplex stainless steel is an alloy with a two-phase metallurgical structure consisting of austenite and ferrite in almost equal parts. The content composition of duplex steel has a higher level of chromium and molybdenum, lower nickel and a percentage of nitrogen between 0.05 to 0.50%. This composition, coupled with heat treatment, makes duplex stainless better at corrosion resistance (chloride stress corrosion and chloride pitting corrosion especially) and higher strength when compared to austenitic stainless.
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Related Alloys
Industry Standard
Chemical Composition
- Carbon:0.030% Max
- Manganese:1.00 - 3.00%
- Silicon:1.00% Max
- Phosphorus:0.030% Max
- Sulfur:0.020% Max
- Chromium:26.0 - 28.0%
- Nickel:6.0 - 8.0%
- Molybdenum:2.0 - 3.5%
- Nitrogen:0.30 - 0.40%
- Nitrogen + Carbon:
- Vanadium:
- Tungsten:3.0 - 4.0%
- Aluminum:
- Titanium:
- Copper:1.00% Max
- Columbium:
- Barium:0.0002 - 0.0100%
- Boron:0.0010 - 0.0100%
- Zirconium:
- Cerium + Lanthanum:0.005 - 0.030%
- Iron:
- Residual Elements:
Physical Properties
- Yield Strength:75 ksi Min
- Tensile Strength:100 ksi Min
- Elongation at 2 in:20% Min
- Reduction of Area:
Charpy Properties
- Test Temperature:
- Average Energy¹:
- Single Energy:
¹ Minimum value for 2 test specimens and minimum average of 3 test specimens.