ASTM A131/A131M A131 Grade AH40 Introduce
The American Petroleum Institute (API) created the {standatd} steel standard, also known as the Petroleum Industry Standard (PSL-3), in 2008. This standard was created to provide the industry and consumers with a sensible, consistent approach to specification and performance-based steel grades. The {stanndard} provides qualification criteria for use by automotive and other industries for the use and classification of steel plates in highly stressed components and applications. It provides a framework for the creation of a reliable, consistent product, which can be used and applied in a variety of applications that require a standard level of performance.
Smelting temperature:1254°C - 1558°C
Application:Structural steel for seagoing
ASTM A131/A131M A131 Grade AH40 Material Chemical Composition
The chemical composition of the ASTM A131/A131M A131 Grade AH40 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | 0.0500 | 0.1000 |
| Titanium (Ti) | - | 0.0200 |
| Silicon (Si) | 0.1000 | 0.5000 |
| Sulfur (S) | - | 0.0350 |
| PhOsphorus (P) | - | 0.0350 |
| Nickel (Ni) | - | 0.4000 |
| Niobium (Nb) | 0.0200 | 0.0500 |
| Molybdenum (Mo) | - | 0.0800 |
| Manganese (Mn) | 0.9000 | 1.6000 |
| Copper (Cu) | - | 0.3500 |
| Chromium (Cr) | - | 0.2000 |
| (CEV) | - | 0.4000 |
| Carbon (C) | - | 0.1800 |
| Aluminum (Al) | 0.0150 | - |
ASTM A131/A131M A131 Grade AH40 Material Mechanical Properties
Due to its chemical composition, ASTM A131/A131M A131 Grade AH40 steel offers excellent tensile and yield strength. Its tensile strength is between 58,000 psi and 65,000 psi, while its yield strength is between 34,000 psi and 48,400 psi. This makes it an excellent choice for shipbuilding, marine engineering, and other applications where strength is vital.
The mechanical properties of the ASTM A131/A131M A131 Grade AH40 steel are as follows:
| YieldRp0.2 | ≤ 941 (MPa) |
| TeileRm | ≤ 575 (MPa) |
| ImpactKV/Ku | 24(J) |
| ElongationA | 14% |
| Reduction in cross section on fractureZ | 23% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 411 |
ASTM A131/A131M A131 Grade AH40 Material Thermal Properties
The thermal performance parameters of the ASTM A131/A131M A131 Grade AH40 steel are as follows:
| Temperature (°C) | 31 | 217 | 348 |
| Modulus of elasticity (GPa) | - | 727 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 23 |
| Thermal conductivity (W/m·°C) | - | 32.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 432 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.33 | - | - |
| Deity (kg/dm³) | - | - | 414 |
| Poisson’s coefficient, ν | - | - | 213 |
ASTM A131/A131M A131 Grade AH40 Material Machining Technology
For most metal machining operations, the most common types of tools are carbide, high-speed steel (HSS), and cobalt. Carbide and HSS tools are the most popular choice, as they tend to be strong, durable, and able to withstand high temperatures. Cobalt tools, while costlier and more difficult to maintain, are most suitable for highly abrasive materials and heavy-duty machining operations.