ASTM A790/A790M Type 2507 Introduce
ASTM A790/A790M is a specification for seamless and welded ferritic-austenitic (duplex) stainless steel pipe. The A790 specification covers several grades of austenitic-ferritic (duplex) stainless steel pipe. This type of stainless steel has a higher corrosion resistance than other forms of stainless steel due to its higher chromium content. The bi-metallic property of duplex stainless steel is highly resistive to general corrosion and stress corrosion.
Smelting temperature:1192°C - 1681°C
Application:Seamless and welded ferritic/austenitic stainless steel tube
ASTM A790/A790M Type 2507 Material Chemical Composition
The chemical composition of the ASTM A790/A790M Type 2507 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | - | 0.8000 |
| Sulfur (S) | - | 0.0200 |
| PhOsphorus (P) | - | 0.0350 |
| Nickel (Ni) | 6.0000 | 8.0000 |
| Nitrogen (N) | 0.2400 | 0.3200 |
| Molybdenum (Mo) | 3.0000 | 5.0000 |
| Manganese (Mn) | - | 1.2000 |
| Copper (Cu) | - | 0.5000 |
| Chromium (Cr) | 24.0000 | 26.0000 |
| Carbon (C) | - | 0.0300 |
ASTM A790/A790M Type 2507 Material Mechanical Properties
The hardness of a material can also be an important factor to consider. ASTM A790/A790M Type 2507 steel is highly resistant to abrasion, therefore it has excellent hardness. The material also has excellent impact fatigue resistance and can withstand impacts over long periods of time.
The mechanical properties of the ASTM A790/A790M Type 2507 steel are as follows:
| YieldRp0.2 | ≤ 472 (MPa) |
| TeileRm | ≤ 939 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 32% |
| Reduction in cross section on fractureZ | 31% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 433 |
ASTM A790/A790M Type 2507 Material Thermal Properties
The thermal performance parameters of the ASTM A790/A790M Type 2507 steel are as follows:
| Temperature (°C) | 44 | 872 | 155 |
| Modulus of elasticity (GPa) | - | 649 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 34 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 23.2 |
| Specific thermal capacity (J/kg·°C) | - | 433 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.14 | - | - |
| Deity (kg/dm³) | - | - | 331 |
| Poisson’s coefficient, ν | - | - | 213 |
ASTM A790/A790M Type 2507 Material Machining Technology
When machining ASTM A790/A790M Type 2507 steel, there are several key factors to consider in order to ensure successful machining. The type of machining process, the type of cutting tool, the type of coolant, and the feed and speed are all important considerations that can have an effect on the accuracy and quality of the machining operation. By selecting the correct combination of these variables, it is possible to produce quality, precision parts and components with ASTM A790/A790M Type 2507 steel.