ASTM A790/A790M S82121 Introduce
ASTM A790/A790M S82121 steel is a type of austenitic duplex stainless steel, a special alloy that has many interesting chemical properties and is used in applications that require high corrosion resistance and high strength. This alloy features a combination of corrosion resistance, ductility, and strength that is advantageous for many different applications. ASTM A790/A790M S82121 steel has been found to be useful in the transport of fluids and gases, the production of power, the manufacture of food packaging, the production of pharmaceuticals, and the production of chemicals.
Smelting temperature:1434°C - 1596°C
Application:Seamless and welded ferritic/austenitic stainless steel tube
ASTM A790/A790M S82121 Material Chemical Composition
The chemical composition of the ASTM A790/A790M S82121 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | - | 0.0350 |
| Manganese (Mn) | 1.0000 | 2.5000 |
| PhOsphorus (P) | - | 0.0400 |
| Sulfur (S) | - | 0.0100 |
| Silicon (Si) | - | 1.0000 |
| Nickel (Ni) | 2.0000 | 4.0000 |
| Chromium (Cr) | 21.0000 | 23.0000 |
| Molybdenum (Mo) | 0.3000 | 1.3000 |
| Copper (Cu) | 0.2000 | 1.2000 |
| Nitrogen (N) | 0.1500 | 0.2500 |
ASTM A790/A790M S82121 Material Mechanical Properties
The combination of elements in ASTM A790/A790M S82121 provides it with excellent corrosion resistance, making it suitable for many different applications. The combination of chromium and nickel in the alloy makes it resistant to many forms of corrosion, including stress corrosion cracking and pitting. The alloy is also resistant to chloride stress corrosion cracking. This means that it is suitable for use in contact with chlorine and other corrosive agents.
The mechanical properties of the ASTM A790/A790M S82121 steel are as follows:
| YieldRp0.2 | ≤ 738 (MPa) |
| TeileRm | ≤ 166 (MPa) |
| ImpactKV/Ku | 42(J) |
| ElongationA | 33% |
| Reduction in cross section on fractureZ | 21% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 122 |
ASTM A790/A790M S82121 Material Thermal Properties
The thermal performance parameters of the ASTM A790/A790M S82121 steel are as follows:
| Temperature (°C) | 24 | 962 | 366 |
| Modulus of elasticity (GPa) | - | 852 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 34 |
| Thermal conductivity (W/m·°C) | - | 41.3 | 12.2 |
| Specific thermal capacity (J/kg·°C) | - | 213 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.11 | - | - |
| Deity (kg/dm³) | - | - | 313 |
| Poisson’s coefficient, ν | - | - | 144 |
ASTM A790/A790M S82121 Material Machining Technology
When machining ASTM A790/A790M S82121 steel, various machining processes can be used depending on the desired outcome. The most common machining processes used are turning, milling, and drilling, with an emphasis on the former two. Turning is a processes by which the steel is rotated and the cutting tool is fed into the material, allowing for a controlled cutting action with a higher amount of precision. Milling processes involve the same concept, but here the steel is moved into the cutting tool instead. Drilling is also used to create holes in the material with high accuracy, but is often used less than the other two processes.