ASTM A790/A790M A790 S39277 Introduce
The ASTM A790/A790M steel standard was developed by the American Society for Testing and Materials (ASTM) as an internationally accepted standard for welded stainless steel and duplex stainless steel pipes. It is an important benchmark for the design, fabrication, and construction of pipelines for use in a range of applications including water supply, gas supply, sewage and drainage, petrochemical, and construction.
Smelting temperature:1431°C - 1697°C
Application:Seamless and welded ferritic/austenitic stainless steel tube
ASTM A790/A790M A790 S39277 Material Chemical Composition
The chemical composition of the ASTM A790/A790M A790 S39277 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Tungsten (W) | 0.8000 | 1.2000 |
| Silicon (Si) | - | 0.8000 |
| Sulfur (S) | - | 0.0020 |
| PhOsphorus (P) | - | 0.0250 |
| Nickel (Ni) | 6.5000 | 8.0000 |
| Nitrogen (N) | 0.2300 | 0.3300 |
| Molybdenum (Mo) | 3.0000 | 4.0000 |
| Manganese (Mn) | - | 0.8000 |
| Copper (Cu) | 1.2000 | 2.0000 |
| Chromium (Cr) | 24.0000 | 26.0000 |
| Carbon (C) | - | 0.0250 |
ASTM A790/A790M A790 S39277 Material Mechanical Properties
Fatigue life is an important characteristic for materials used in applications where frequent load and cycle variations can occur. This includes industries such as aerospace and automotive engineering. Steel that has been manufactured in accordance to the ASTM A790/A790M A790 S39277 standard has shown excellent fatigue properties. It has shown superior fatigue life compared to other steel alloys when subjected to variable loads and cyclic conditions.
The mechanical properties of the ASTM A790/A790M A790 S39277 steel are as follows:
| YieldRp0.2 | ≤ 348 (MPa) |
| TeileRm | ≤ 638 (MPa) |
| ImpactKV/Ku | 24(J) |
| ElongationA | 21% |
| Reduction in cross section on fractureZ | 14% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 122 |
ASTM A790/A790M A790 S39277 Material Thermal Properties
The thermal performance parameters of the ASTM A790/A790M A790 S39277 steel are as follows:
| Temperature (°C) | 13 | 478 | 914 |
| Modulus of elasticity (GPa) | - | 996 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 42 |
| Thermal conductivity (W/m·°C) | - | 34.3 | 41.2 |
| Specific thermal capacity (J/kg·°C) | - | 214 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.41 | - | - |
| Deity (kg/dm³) | - | - | 123 |
| Poisson’s coefficient, ν | - | - | 123 |
ASTM A790/A790M A790 S39277 Material Machining Technology
When turning and milling ASTM A790/A790M A790 S39277 steel, the type of cutting tool used can have an effect on the speed and accuracy of the machining operation. High-speed steel (HSS) and carbide cutting tools are the most common, with HSS commonly used for high-speed applications and carbide for finishing operations. It is recommended to use a coated carbide tool for increased performance, as this will reduce tool wear and increase cutting speed. Additionally, a positive rake angle should be used for turning operations and a negative one for milling operations in order to ensure maximum results.