Release time：2020-01-16 18:44 Browse：
The materials used for elongated screws vary depending on the required strength grade. Below is a list of common materials corresponding to each grade according to ISO 898-1 standards:
| Strength Grade | Common Materials |
|---|---|
| Grade 4.8 | Low Carbon Steel (e.g., Q235, SWRM8) |
| Grade 8.8 | Alloy Steel (e.g., SCM435, 35CrMo, 40Cr) |
| Grade 10.9 | Alloy Steel (e.g., SCM435, 42CrMo) |
| Grade 12.9 | High Alloy Steel (e.g., SCM435, SNCM439, 20MnTiB) |
Notes:
Grade 4.8 screws are typically made from low carbon steel and are not heat-treated. They are suitable for light-duty applications.
Grades 8.8 and above require quenching and tempering to achieve the necessary mechanical properties.
SCM435 is a versatile chromium-molybdenum alloy steel that can be used for 8.8, 10.9, and even 12.9 grade screws.
Grade 12.9 screws demand high-strength materials and precise heat treatment, making them suitable for critical or high-load applications.
