42CrMo is recognized globally under various national and international standards, each with a slightly different naming convention but specifying essentially the same chemical composition and properties. Here is a comparative table of the most common designations:
| Standard / Country | Grade Designation | Comparable/Equivalent |
|---|---|---|
| China (GB/T) | 42CrMo (Main) | The original designation. |
| Germany (DIN, EN predecessor) | 42CrMo4 | The "4" indicates approx. 1% Cr content (4/4 = 1%). |
| European Union (EN) | 1.7225 (Material Number) | Commonly referred to as 42CrMo4 in EN 10083-3. |
| United States (AISI/SAE, ASTM) | 4140 / 4142 | 4140 has a slightly lower C range (0.38-0.43%) than 42CrMo, while 4142 (0.40-0.45%) is a closer match. Often used interchangeably. |
| Japan (JIS) | SCM440 | Very close equivalent, part of the Cr-Mo steel series. |
| International (ISO) | 42CrMo4 (ISO 683-1) | Aligns with the European designation. |
Note: While these grades are highly similar and often used as substitutes, critical applications require careful verification of the specific standard's required composition ranges, heat treatment parameters, and mechanical property guarantees.