Technical features of ASTM A487 application
The ASTM A487 standard regulates the technical requirements for low-alloy and martensitic stainless steels supplied in normalized and tempered or quenched and tempered conditions. These alloys are optimized for the production of cast parts operating under high pressure. When designing assemblies, it should be noted that the weldability of each grade varies: from universal solutions to materials requiring strict adherence to heat treatment protocols and preheating during fusion welding.
The engineering selection of steel grades within EV Group China is based on a combination of specified mechanical properties, geometric parameters of the casting, and the specifics of the operating environment. A critical factor is the hardenability of the material, which limits the maximum cross-sectional dimensions of the part while ensuring the achievement of the required yield strength and impact toughness.
Technical documentation contains values in both metric and inch-pound systems. In engineering calculations, it is recommended to use only one system of measurement to avoid errors during conversion.
Chemical composition and standardization
The chemical composition of steels must strictly comply with the limits established in Table 2 of this standard. Quality control of chemical analysis is carried out according to the A703/A703M specifications. In the case of production by precision casting, the tolerances specified by A985/A985M apply. For stainless alloys not covered by current standards, industry protocols currently in the final standardization stage are in effect.
| Parameter | Regulation |
|---|---|
| Composition control | ASTM A703/A703M |
| Precision casting | ASTM A985/A985M |