Chemical Composition
| UNS DesignationB |
TypeB |
Carbon |
Manganese |
Phosphorus |
Sulfur |
Silicon |
Chromium |
Nickel |
Molybdenum |
Nitrogen |
Other Elements |
| Duplex (Ferritic-Austenitic) Grades |
| S31803 |
... |
0.030 |
2.00 |
0.030 |
0.020 |
1.00 |
21.0-23.0 |
4.5-6.5 |
2.5-3.5 |
0.08-0.20 |
... |
Note:
A. Maximum or range unless otherwise indicated.
B. See Guide A959/A959M.
Heat Treatment and Mechanical Property Requirements for Duplex Grades A
| UNS Designation |
Solution Temperature, °F [°C] B,C |
Size Range |
Mechanical Properties |
| Tensile Strength, ksi [MPA] |
Yield Strength, ksi [MPA] |
Elongation in 2” [50 mm] or 4D % |
HardnessD |
| Rockwell, HRC maximum |
Brinell, maximum |
| S31803 |
1900 [1040] |
-- |
90 [620] |
65 [450] |
25 |
30 |
290 |
Note:
A. Values shown are minimums or ranges unless maximum is indicated.
B. ± 25°F [15°C].
C. Quenched in water.
D. Either Rockwell or Brinell testing is permitted unless thickness is below 1⁄2 ” in which
case Rockwell is preferred.
Product Marking
| UNS Designation |
Type |
Condition |
Grade Symbol |
| Duplex (Ferritic-Austenitic) Grade |
| S31803 |
-- |
-- |
31803 |