| Category | Steel grade | Standard | Country | Application |
|---|---|---|---|---|
| Special Alloy | X45CrSi9-3 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X40CrSiMo10-2 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X33CrNiMnN23-8 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | NiFe25Cr20NbTi | UNE | Spain | Spain structural alloy steel |
| Special Alloy | NiCr20TiAl | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X25CrMnNiN25-9-7 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X18CrN28 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X15CrNiSi25-2i | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X15CrNiSi25-4 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X15CrNiSi20-12 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X12CrNi23-13 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X12NiCrSi35-16 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X10NiCrSiNb35-22 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X10NiCrSi35-19 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X10NiCrAITi32-21 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X10CrAlSi25 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X10CrAlSi18 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X10CrAlSi13 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X10CrAlSi7 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X9CrNiSiNCe21-11-2 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X8CrNiTi18-10 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X8CrNi25-21 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X6NiCrSiNCe35-25 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X6NiCrNbCe32-27 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X6CrNiSiNCc19-10 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X3CrAITi18-2 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | NiCr28FeSiCe | UNE | Spain | Spain structural alloy steel |
| Special Alloy | NiCr23Fe | UNE | Spain | Spain structural alloy steel |
| Special Alloy | NiCr22Mo9Nb | UNE | Spain | Spain structural alloy steel |
| Special Alloy | NiCr20Ti | UNE | Spain | Spain structural alloy steel |
| Special Alloy | NiCr15Fs8 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X3CrMnNiN1887 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X2CrNiMoN17135 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X2CrNiMoN17133 | UNE | Spain | Spain structural alloy steel |
| Special Alloy | X2CrNiMoN17122 | UNE | Spain | Spain structural alloy steel |
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