| Internal Grade | SAE/AISI | IS | BS 970:1955 | BS 970:1983 | EN | JIS | DIN | GOST | ISO | AFNOR | GB/T | UNI | SS | CSA | AS/NZS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BR15B25 | 15B25 | 15B25 | — | — | — | SBV2 | 15B25 | 15ГБ | 683/III-A | 15B25 | 15B25 | 15B25 | 2544 | G15B25 | AS 1444 15B25 |
| BR15B41 | 15B41 | 15B41 | — | — | — | SBV4 | 38MnB5 | 38ГБ | 683/III-C | 15B41 | 15B41 | 15B41 | — | G15B41 | AS 1444 15B41 |
| BR20MnB4 | 20MnB4 | 20MnB4 | — | — | EN10083-3: 20MnB4 | — | 20MnB4 | 20МНБ | 683/III-B | 20B4 | 20MnB4 | 20MnB4 | 2552 | G20MnB4 | AS 1444 20MnB4 |
| BR22MnB5 | 22MnB5 | 22MnB5 | — | — | EN10083-3: 22MnB5 | — | 22MnB5 | 22МНБ | 683/III-D | 22B5 | 22MnB5 | 22MnB5 | — | G22MnB5 | AS 1444 22MnB5 |
| BR38MnB5 | 38MnB5 | 38MnB5 | — | — | EN10083-3: 38MnB5 | — | 38MnB5 | 38МНБ | 683/III-E | 38B5 | 38MnB5 | 38MnB5 | — | G38MnB5 | AS 1444 38MnB5 |
Note: Boron steels are widely used in automotive and structural applications requiring high strength after quenching. Their equivalents may vary based on boron treatment and steelmaking practices. Most are delivered as hot-rolled or cold-finished bars and wires for press-hardened parts. Some equivalents shown above may differ slightly in Mn or Cr content but are functionally comparable.