Duplex Round Bars & Super Duplex Round Bars
Duplex stainless steels are called "duplex" because they have a two-phase microstructure consisting of grains of ferritic and austenitic stainless steel. This structure provides a unique set of benefits.
Duplex steel bars have enormous hardness making them the first choice for applications that need strength.
Chemical Composition of Duplex Round Bar :
| Standard | Grade | C % | Si % | Mn % | P % | S % | Cr % | Mo % | Ni (Max) | Cu % | N2 (Max) |
| ASTM A 182:2018 | F-51 | 0.03 | 1 | 2 | 0.03 | 0.02 | 21-23 | 2.5-3.5 | 4.5-6.5 | 0.08-0.2 | |
| ASTM A 182:2018 | F-60 | 0.03 | 1 | 2 | 0.03 | 0.02 | 22-23 | 3.0-3.5 | 4.5-6.5 | 0.14-0.2 | |
| ASTM A 182:2018 | F-53 | 0.03 | 0.8 | 1.2 | 0.035 | 0.02 | 24-26 | 44625 | 6.0-8.0 | 0.5 | 0.24-0.32 |
| ASTM A 276:2017 | UNS S32205 | 0.03 | 1 | 2 | 0.03 | 0.02 | 22-23 | 3.0-3.5 | 4.5-6.5 | 0.14-0.2 | |
| ASTM A 276:2017 | UNS S31803 | 0.03 | 1 | 2 | 0.03 | 0.02 | 21-23 | 2.5-3.5 | 4.5-6.5 | 0.08-0.20 | |
| ASTM A 240:2018 | UNS S32750 | 0.03 | 0.8 | 1.2 | 0.035 | 0.02 | 24-26 | 44625 | 6.0-8.0 | 0.5 | 0.24-0.32 |
| Din EN 10088-3 : 2014 | 1.4462 | 0.03 | 1 | 2 | 0.035 | 0.015 | 21-23 | 2.5-3.5 | 4.5-6.5 | 0.1-0.22 | |
| Din EN 10088-3 : 2014 | 1.446 | 0.05 | 1 | 2 | 0.035 | 0.03 | 25-28 | 1.3-2.0 | 4.5-6.5 | 0.05-0.2 | |
| EN 10095 : 1999 | 1.4821 | 0.1-0.2 | 0.8-1.5 | 2 | 0.04 | 0.015 | 24.5-26.5 | 3.5-5.5 | 0.11 | ||
| Din EN 10088-3 :2014 | 1.441 | 0.03 | 1 | 2 | 0.035 | 0.015 | 24-26 | 3.0-4.5 | 6.0-8.0 | 0.24-0.35 | |
| EN 10028-7 : 2000 | 1.4362 | 0.03 | 1 | 2 | 0.035 | 0.015 | 22-24.5 | 0.1-0.6 | 3.5-5.5 | 0.1-0.6 | 0.05-0.2 |
Mechanical Properties
| Grade No. | Yield strength (Rp 0.2%) (Min) | UTS (Mpa)(Min) | UTS (Mpa)(Max) | % Elongation (Min) | % Reduction area (Min) | Hardness (BHN) (Max) |
| 1.4462 | 450 | 650 | 880 | 25 | – | 270 |
| UNS S31803 | 448 | 620 | – | 25 | – | 290 |
| UNS S32205 | 450 | 655 | – | 25 | – | 290 |
Applications
Structural Design Components
Storage and Exchange Equipment(High Pressure, Saline applications)
Heat Exchanger
Aerospace, Pulp and Paper Industry
Duplex stainless steels are called “duplex” because they have a two-phase micro-structure consisting of phases of ferritic and austenitic stainless steel.
This structure provides a unique set of benefits.
Strength
Duplex stainless steels are about twice as strong as regular austenitic or ferritic stainless steel.
Corrosion resistance
As with all stainless steels, corrosion resistance depends mostly on the composition of the stainless steel. The composition of this steel makes it better at resisting corrision.
Toughness and ductility
Duplex stainless steel has significantly better toughness and ductility than ferritic grades.