General Characteristics
2507 is a super duplex product with higher corrosion resistance and mechanical strength than 2205. Often used in extremely corrosive environments such as desalination, chemical, or offshore subsea applications.
Typical Applications
Desalination plants
Industrial piping
Scrubbers
Tubes for oil and gas applications
Deep-sea pipelines
Flanges and valves
Chemical Composition
The typical chemical composition for this grade is given in the table below, together with composition limits given for the product according to different standards. The required standard will be fully met as specified on the order.
The chemical composition is given as % by mass.
| C | Mn | Cr | Ni | Mo | N | |
Typical | 0.02 | 25.0 | 7.0 | 4.0 | 0.27 | |
ASME II A SA-240 | ≤0.030 | ≤1.20 | 24.0-26.0 | 6.00-8.00 | 3.00-5.00 | 0.24-0.32 |
ASTM A240 | ≤0.030 | ≤1.20 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 |
EN 10028-7 | ≤0.030 | ≤2.00 | 24.00-26.00 | 6.00-8.00 | 3.00-4.50 | 0.20-0.35 |
EN 10088-2 | ≤0.030 | ≤2.00 | 24.0-26.0 | 6.0-8.0 | 3.0-4.5 | 0.24-0.35 |
EN 10088-3 | ≤0.030 | ≤2.00 | 24.0-26.0 | 6.0-8.0 | 3.0-4.5 | 0.24-0.35 |
EN 10088-4 | ≤0.030 | ≤2.00 | 24.0-26.0 | 6.0-8.0 | 3.0-4.5 | 0.24-0.35 |
IS 6911 | ≤0.030 | ≤1.20 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 |
Mechanical Properties
The duplex stainless steels have much higher mechanical strength compared to standard stainless steels. If the high strength of the duplex grades can be utilized, downgauging can be done in many applications, leading to cost-efficient solutions. The allowable design values may vary between product forms. The appropriate values are given in the relevant specifications.
| Standard | Rp0.2 | Rp1.0 | Rm | Elongation | Rockwell | HB |
MPa | MPa | MPa | % | |||
Product type: Cold rolled coil and sheet | ||||||
Typical (thickness 1 mm) | 730 | 790 | 940 | 40 | ||
ASME II A SA-240 | ≥ 550 | ≥ 795 | ≤ 310 | |||
ASTM A240 | ≥ 550 | ≥ 795 | ≤ 32HRC | ≤ 310 | ||
EN 10028-7 | ≥ 550 | 750-1000 | ≥ 20 | |||
EN 10088-2 | ≥ 550 | 750-1000 | ≥ 20 | |||
EN 10088-4 | ≥ 550 | 750-1000 | ≥ 20 | |||
IS 6911 | ≥ 550 | ≥ 795 | ≤ 32HRC | ≤ 310 | ||
Product type: Hot rolled coil and sheet | ||||||
Typical (thickness 4 mm) | 700 | 785 | 905 | 30 | 270 | |
ASME II A SA-240 | ≥ 550 | ≥ 795 | ≤ 310 | |||
ASTM A240 | ≥ 550 | ≥ 795 | ≤ 310 | |||
EN 10028-7 | ≥ 550 | 750-1000 | ≥ 20 | |||
EN 10088-2 | ≥ 550 | 750-1000 | ≥ 20 | |||
EN 10088-4 | ≥ 550 | 750-1000 | ≥ 20 | |||
IS 6911 | ≥ 550 | ≥ 795 | ≤ 32HRC | ≤ 310 | ||
Product type: Hot rolled quarto plate | ||||||
Typical (thickness 15 mm) | 580 | 830 | 35 | 250 | ||
ASME II A SA-240 | ≥ 550 | ≥ 795 | ≤ 32HRC | ≤ 310 | ||
ASTM A240 | ≥ 550 | ≥ 795 | ≤ 32HRC | ≤ 310 | ||
EN 10028-7 | ≥ 530 | 730-930 | ≥ 20 | |||
EN 10088-2 | ≥ 530 | 730-930 | ≥ 20 | |||
EN 10088-4 | ≥ 530 | 730-930 | ≥ 20 | |||
IS 6911 | ≥ 550 | ≥ 795 | ≤ 32HRC | ≤ 310 | ||
Physical Properties
The physical properties at room temperature are shown in the table below. Data according to EN 10088 or EN 10095.
| Density | Modulus of elasticity | Thermal exp. at 100 °C | Thermal conductivity |
kg/dm3 | GPa | 10-6/°C | W/m°C |
7.8 | 200 | 13 | 15 |
