ASTM A203/A203M Grade A Introduce
ASTM A203/A203M Grade A is a kind of Nickel-Alloy Steel plates material used to fabric high-temperature pressure vessels, it is widely used in the production of reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks, pressure tanks, and much more. It is widely used by the petroleum, chemical, and power industries in a variety of processes. It is one of the most commonly used alloys because it offers some distinct advantages over other forms of steel.
Smelting temperature:1197°C - 1785°C
Application:Nickel alloy steel plate for pressure vessel
ASTM A203/A203M Grade A Material Chemical Composition
The chemical composition of the ASTM A203/A203M Grade A steel are as follows:
| Element | Min | Max |
|---|---|---|
| Nickel (Ni) | 2.1000 | 2.5000 |
| PhOsphorus (P) | - | 0.0350 |
| Sulfur (S) | - | 0.0350 |
| Manganese (Mn) | - | 0.7000 |
| Silicon (Si) | 0.1500 | 0.4000 |
| Carbon (C) | - | 0.1700 |
| Silicon (Si) | 0.1300 | 0.4500 |
| Sulfur (S) | - | 0.0250 |
| PhOsphorus (P) | - | 0.0250 |
| Nickel (Ni) | 2.0300 | 2.5700 |
| Manganese (Mn) | - | 0.7800 |
| Carbon (C) | - | 0.1700 |
ASTM A203/A203M Grade A Material Mechanical Properties
ASTM A203/A203M Grade A has a high corrosion resistance and ductility but is not as strong as other alloys. This makes it ideal for high pressure vessels and other applications where strength is not a major concern. It is especially suitable for environments that are more prone to corrosion, such as salt water and other aggressive agents.
The mechanical properties of the ASTM A203/A203M Grade A steel are as follows:
| YieldRp0.2 | ≤ 341 (MPa) |
| TeileRm | ≤ 724 (MPa) |
| ImpactKV/Ku | 13(J) |
| ElongationA | 43% |
| Reduction in cross section on fractureZ | 22% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 231 |
ASTM A203/A203M Grade A Material Thermal Properties
The thermal performance parameters of the ASTM A203/A203M Grade A steel are as follows:
| Temperature (°C) | 23 | 195 | 277 |
| Modulus of elasticity (GPa) | - | 791 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 14 |
| Thermal conductivity (W/m·°C) | - | 14.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 232 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.31 | - | - |
| Deity (kg/dm³) | - | - | 443 |
| Poisson’s coefficient, ν | - | - | 221 |
ASTM A203/A203M Grade A Material Machining Technology
ASTM A203/A203M Grade A can be manufactured in a variety of ways, including forming, forging, and machining. During forming, the alloy is heated to a temperature that makes it pliable and easier to shape. Forging involves compressing the material until it takes the shape desired. Machining is done to take the shape of the finished product even farther, creating different parts and components from the same stock material.