The backing steel is ordinarily plain carbon and alloy steel. All carbon and alloy steel conforming to ASTM, ASME, BS, DIN, GOST, AB, LR, KR, NV, JIS, and other specification are available.
| ASTM | EQUIVALENTS(INTERNATIONAL GRADES) | ||
| DESIGNATION | DIN | BS | NF |
| A285-90 Grade A | – | – | – |
| A285-90 Grade B | DIN17155 Type HI | BS1501-151 Grade 360 | A37C1orC2-NFA36.205 |
| A285-90 Grade C | DIN17155 Type HI | BS1501-151 Grade 360 | A37C1orC2-NFA36.205 |
| A515-92 Grade 60 | DIN17155 Type HII | BS1501-151 Grade 400 | A42C1orC2-NFA36.205 |
| A515-92 Grade 65 | DIN17155 Type HIII | BS1501-151 Grade 430 | A48C1orC2-NFA36.208 |
| A515-92 Grade 70 | DIN17155 Type HIV | – | A48C1orC2-NFA36.208 |
| A516-90 Grade 55 | DIN17135 Ast 35 | – | A37R1orP2-NFA36.205 |
| A516-90 Grade 60 | DIN17135 Ast 41 | BS1501-161 Grade 400 | A42P1orP2-NFA36.205 |
| A516-90 Grade 65 | DIN17135 Ast 45 | BS1501-224 Grade 460 | A42FP1orFP2-NFA36.208 |
| A516-90 Grade 70 | DIN17155 17Mn4 DIN17155 19Mn5 |
BS1501-224 Grade 490 | A48P1or-P2-NFAF 36.205 A48FP1orFP2-NFAF 36.208 |
| A204-93 Grade A | DIN17155 15Mo3 | – | 15D3-NFA36.206 |
| A204-93 Grade B | DIN17155 16Mo5 | – | – |
| A204-93 Grade C | – | – | – |
| A387-92 Grade 2 A387-92 Class 2 |
– | BS1501-271 | 15CD2.05-NFA3.206 |
| A387-92 Grade 12 A387-92Class 2 |
DIN17155 13CrMo44 | BS1501-620 | 15CD4.05-NFA36.206 |
| A387-92 Grade 11 A387-92 Class 2 |
– | BS1501-621 | – |
| A387-92 Grade 22 A387-92 Class 2 |
DIN17155 10CrMo9.10 | BS1501-622/515 | 10CD9.10-NFA36.206 |
| A387-92 Grade 21 A387-92 Class 2 |
– | – | – |
| A302-93 Grade A | – | – | 18MD7-05 15MDV4-05-NFA36.206 |
| A302-93 Grade B | – | – | 15MDV4-05-NFA36.206 |
| A302-93 Grade C | – | – | – |
| A302-93 Grade D | – | – | – |
| A299-90 | DIN17155 19Mn5 | – | A52C1-NFA 36.205 |
| A537-95 Class 1 | DIN17155 StE355 | BS1501-244Grade 490 | A52FP1-NFA36.208 |
| A537-95 Class 2 | DIN17155 StE420 | – | – |