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Category · 39 grades

# Special steels for aviation and aerospace

Special steels for aviation and aerospace are engineered steels designed to provide controlled mechanical properties and reliable performance in demanding service. Their alloying and heat-treatment capabilities support components that require a combination of strength, toughness and fatigue resistance, including aircraft structures and engine parts.

| Grade | Material no. | C | Si | P | S | Mn | Cr |
|---|---|---|---|---|---|---|---|
| 1.4014 | [1.4014](/materials/material-no/1.4014 "1.4014") | 0,17-0,22 | ≤1,00 | 0,035 | 0,03 | ≤1,00 | 12,0-14,0 |
| [X15CrNi17-3](/materials/din-en/x15crni17-3 "X15CrNi17-3") | [1.4044](/materials/material-no/1.4044 "1.4044") | 0,12-0,20 | ≤1,00 | 0,035 | 0,025 | ≤1,00 | 15,0-18,0 |
| 1.4304 | [1.4304](/materials/material-no/1.4304 "1.4304") | ≤0,12 | ≤1,00 | 0,045 | 0,03 | ≤2,00 | 17,0-19,0 |
| [S30400](/materials/uns/s30400 "S30400") | [1.4314](/materials/material-no/1.4314 "1.4314") | ≤0,07 | ≤1,00 | 0,045 | 0,03 | ≤2,00 | 17,0-19,0 |
| [S30100](/materials/uns/s30100 "S30100") | [1.4324](/materials/material-no/1.4324 "1.4324") | ≤0,12 | ≤1,00 | 0,045 | 0,03 | ≤2,00 | 16,0-18,0 |
| [X3CrNiMoAl13-8-2](/materials/din-en/x3crnimoal13-8-2 "X3CrNiMoAl13-8-2") | [1.4534](/materials/material-no/1.4534 "1.4534") | ≤0,05 | ≤0,10 | 0,01 | 0,008 | ≤0,10 | 12,25-13,25 |
| [S30347](/materials/uns/s30347 "S30347") | [1.4544](/materials/material-no/1.4544 "1.4544") | ≤0,08 | ≤1,00 | 0,035 | 0,025 | ≤2,00 | 17,0-19,0 |
| [X5CrNiCu15-5](/materials/din-en/x5crnicu15-5 "X5CrNiCu15-5") | [1.4545](/materials/material-no/1.4545 "1.4545") | ≤0,07 | ≤1,00 | 0,03 | 0,015 | ≤1,00 | 15,0-15,5 |
| [X5CrNiNb18-10](/materials/din-en/x5crninb18-10 "X5CrNiNb18-10") | [1.4546](/materials/material-no/1.4546 "1.4546") | ≤0,08 | ≤1,00 | 0,045 | 0,03 | ≤2,00 | 17,0-19,0 |
| [X5CrNiCuNb17-4-4](/materials/din-en/x5crnicunb17-4-4 "X5CrNiCuNb17-4-4") | [1.4548](/materials/material-no/1.4548 "1.4548") | ≤0,07 | ≤1,00 | 0,025 | 0,025 | ≤1,00 | 15,0-17,5 |
| [GX5CrNiCuNb16-4](/materials/din-en/gx5crnicunb16-4 "GX5CrNiCuNb16-4") | [1.4549](/materials/material-no/1.4549 "1.4549") | ≤0,06 | 0,50-1,00 | 0,04 | 0,03 | ≤0,70 | 15,5-16,7 |
| [S17700](/materials/uns/s17700 "S17700") | [1.4564](/materials/material-no/1.4564 "1.4564") | ≤0,09 | ≤1,00 | 0,04 | 0,03 | ≤1,00 | 16,0-18,0 |
| [S15700](/materials/uns/s15700 "S15700") | [1.4574](/materials/material-no/1.4574 "1.4574") | ≤0,09 | ≤1,00 | 0,04 | 0,03 | ≤1,00 | 14,0-16,0 |
| [S64152](/materials/uns/s64152 "S64152") | [1.4933](/materials/material-no/1.4933 "1.4933") | 0,08-0,13 | ≤0,35 | 0,03 | 0,025 | 0,50-0,90 | 11,0-12,5 |
| [X4NiCrTiMoV26-15](/materials/din-en/x4nicrtimov26-15 "X4NiCrTiMoV26-15") | [1.4943](/materials/material-no/1.4943 "1.4943") | ≤0,06 | ≤1,00 | 0,025 | 0,015 | ≤2,00 | 13,5-16,0 |
| [GX15CrNiCo21-20-20](/materials/din-en/gx15crnico21-20-20 "GX15CrNiCo21-20-20") | [1.4957](/materials/material-no/1.4957 "1.4957") | ≤0,20 | ≤1,00 | 0,035 | 0,025 | 1,00-2,00 | 20,0-22,5 |
| [G93106](/materials/uns/g93106 "G93106") | [1.5924](/materials/material-no/1.5924 "1.5924") | 0,14-0,19 | ≤0,40 | 0,035 | 0,035 | 0,40-0,60 | 1,40-1,70 |
| [K44414](/materials/uns/k44414 "K44414") | [1.5934](/materials/material-no/1.5934 "1.5934") | 0,15-0,20 | 0,15-0,40 | 0,035 | 0,035 | 0,40-0,60 | 1,80-2,10 |
| [K93120](/materials/uns/k93120 "K93120") | [1.6354](/materials/material-no/1.6354 "1.6354") | ≤0,03 | ≤0,10 | 0,01 | 0,01 | ≤0,10 | — |
| [X2NiCoMo18-12](/materials/din-en/x2nicomo18-12 "X2NiCoMo18-12") | [1.6355](/materials/material-no/1.6355 "1.6355") | ≤0,03 | ≤0,10 | 0,01 | 0,01 | ≤0,10 | — |
| [X2NiCoMoTi18-12-4](/materials/din-en/x2nicomoti18-12-4 "X2NiCoMoTi18-12-4") | [1.6356](/materials/material-no/1.6356 "1.6356") | ≤0,03 | ≤0,10 | 0,01 | 0,01 | ≤0,10 | — |
| [X2NiCoMo18-9-5](/materials/din-en/x2nicomo18-9-5 "X2NiCoMo18-9-5") | [1.6358](/materials/material-no/1.6358 "1.6358") | ≤0,03 | ≤0,10 | 0,01 | 0,01 | ≤0,10 | — |
| [X2NiCoMo18-8-5](/materials/din-en/x2nicomo18-8-5 "X2NiCoMo18-8-5") | [1.6359](/materials/material-no/1.6359 "1.6359") | ≤0,03 | ≤0,10 | 0,01 | 0,01 | ≤0,10 | — |
| 1.6604 | [1.6604](/materials/material-no/1.6604 "1.6604") | 0,26-0,34 | 0,15-0,40 | 0,025 | 0,025 | 0,30-0,60 | 1,80-2,30 |
| [32NiCrMo12-5](/materials/din-en/32nicrmo12-5 "32NiCrMo12-5") | [1.6655](/materials/material-no/1.6655 "1.6655") | 0,29-0,36 | 0,15-0,40 | 0,025 | 0,025 | 0,25-0,50 | 1,20-1,50 |
| [1.6657](/materials/material-no/1.6657 "1.6657") | [1.6657](/materials/material-no/1.6657 "1.6657") | 0,11-0,17 | ≤0,40 | 0,025 | 0,035 | 0,30-0,60 | 0,80-1,10 |
| [G93150](/materials/uns/g93150 "G93150") | [1.6658](/materials/material-no/1.6658 "1.6658") | 0,12-0,17 | 0,15-0,40 | 0,015 | 0,01 | 0,30-0,60 | 0,80-1,10 |
| [G43370](/materials/uns/g43370 "G43370") | [1.6944](/materials/material-no/1.6944 "1.6944") | 0,35-0,40 | 0,15-0,35 | 0,015 | 0,01 | 0,50-0,80 | 0,65-0,90 |
| 1.6964 | [1.6964](/materials/material-no/1.6964 "1.6964") | ≤0,03 | ≤0,10 | 0,01 | 0,01 | ≤0,10 | 11,0-13,0 |
| [K91283](/materials/uns/k91283 "K91283") | [1.6974](/materials/material-no/1.6974 "1.6974") | 0,29-0,34 | ≤0,10 | 0,01 | 0,01 | 0,10-0,35 | 0,90-1,10 |
| [25CrMo4](/materials/din-en/25crmo4 "25CrMo4") | [1.7214](/materials/material-no/1.7214 "1.7214") | 0,22-0,29 | 0,15-0,35 | 0,02 | 0,015 | 0,50-0,80 | 0,90-1,20 |
| [J24056](/materials/uns/j24056 "J24056") | [1.7254](/materials/material-no/1.7254 "1.7254") | 0,23-0,28 | 0,30-0,50 | 0,02 | 0,015 | 0,50-0,70 | 0,80-1,10 |
| [15CDV6](/materials/afnor/15cdv6 "15CDV6") | [1.7734](/materials/material-no/1.7734 "1.7734") | 0,12-0,18 | ≤0,20 | 0,02 | 0,015 | 0,80-1,10 | 1,25-1,50 |
| 1.7736 | [1.7736](/materials/material-no/1.7736 "1.7736") | 0,12-0,18 | ≤0,20 | 0,02 | 0,005 | 0,80-1,10 | 1,25-1,50 |
| 1.7784 | [1.7784](/materials/material-no/1.7784 "1.7784") | 0,38-0,43 | 0,80-1,00 | 0,015 | 0,01 | 0,20-0,40 | 4,75-5,25 |
| [G61500](/materials/uns/g61500 "G61500") | [1.8154](/materials/material-no/1.8154 "1.8154") | 0,47-0,55 | 0,15-0,40 | 0,035 | 0,035 | 0,70-1,10 | 0,90-1,20 |
| [K24065](/materials/uns/k24065 "K24065") | [1.8514](/materials/material-no/1.8514 "1.8514") | 0,26-0,34 | ≤0,40 | 0,025 | 0,025 | 0,40-0,70 | 2,30-2,70 |
| 1.8544 | [1.8544](/materials/material-no/1.8544 "1.8544") | 0,30-0,37 | 0,20-0,50 | 0,025 | 0,025 | 0,50-0,80 | 1,00-1,30 |
| 1.8564 | [1.8564](/materials/material-no/1.8564 "1.8564") | 0,28-0,35 | 0,10-0,40 | 0,025 | 0,02 | 0,40-0,70 | 2,80-3,30 |

## Standards covering this category

 18

- [**UNS***30 grades*](/materials/uns "UNS — 30 grades in this category")
- [**AISI / SAE***20 grades*](/materials/aisi-sae "AISI / SAE — 20 grades in this category")
- [**SAE AMS***20 grades*](/materials/ams "SAE AMS — 20 grades in this category")
- [**ASTM***17 grades*](/materials/astm "ASTM — 17 grades in this category")
- [**DIN / EN***15 grades*](/materials/din-en "DIN / EN — 15 grades in this category")
- [**BS***9 grades*](/materials/bs "BS — 9 grades in this category")
- [**AFNOR***7 grades*](/materials/afnor "AFNOR — 7 grades in this category")
- [**JIS***4 grades*](/materials/jis "JIS — 4 grades in this category")
- [**GOST***3 grades*](/materials/gost "GOST — 3 grades in this category")
- [**PN***3 grades*](/materials/pn "PN — 3 grades in this category")
- [**ABNT NBR***3 grades*](/materials/abnt "ABNT NBR — 3 grades in this category")
- [**GB***2 grades*](/materials/gb "GB — 2 grades in this category")
- [**UNE***1 grade*](/materials/une "UNE — 1 grade in this category")
- [**UNI***1 grade*](/materials/uni "UNI — 1 grade in this category")
- [**ČSN***1 grade*](/materials/csn "ČSN — 1 grade in this category")
- [**MSZ***1 grade*](/materials/msz "MSZ — 1 grade in this category")
- [**BDS***1 grade*](/materials/bds "BDS — 1 grade in this category")
- [**ÖNORM***1 grade*](/materials/onorm "ÖNORM — 1 grade in this category")

## Property ranges

 17

| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| ReH | N/mm² | 345 | 355 | 1 |
| Rm | N/mm² | 580 | 1400 | 3 |
| A80 | % | 19 | 19 | 1 |
| Re | N/mm² | 650 | 835 | 2 |
| A5 | % | 8 | 12 | 2 |
| Z | % | 20 | 50 | 2 |
| KCU | kJ/m² | 250 | 980 | 2 |
| HB | — | 166 | 269 | 2 |
| HV | — | 175 | 435 | 1 |
| rho | g/cm³ | 7.76 | 7.95 | 39 |
| E | GPa | 139 | 200 | 1 |
| alpha | 10^-6/K | 11.7 | 13.9 | 1 |
| lambda | W/(m·K) | 30 | 36 | 1 |
| Ac1 | °C | 700 | 700 | 1 |
| Ac3 | °C | 810 | 810 | 1 |
| Ar3 | °C | 400 | 400 | 1 |
| Ar1 | °C | 350 | 350 | 1 |

Derived from 39 grades in this category with a recorded value.

## Composition range

 17

| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| B | % | 0.003 | 0.01 | 1 |
| C | % | 0.03 | 0.55 | 39 |
| N | % | 0.01 | 0.2 | 4 |
| Al | % | 0.05 | 1.5 | 10 |
| Si | % | 0.1 | 1 | 39 |
| P | % | 0.01 | 0.045 | 39 |
| S | % | 0.005 | 0.035 | 39 |
| Ti | % | 0.1 | 2 | 8 |
| V | % | 0.06 | 0.6 | 9 |
| Cr | % | 0.65 | 22.5 | 34 |
| Mn | % | 0.1 | 2 | 39 |
| Co | % | 4.25 | 21 | 8 |
| Ni | % | 0.3 | 27 | 33 |
| Cu | % | 0.5 | 5 | 4 |
| Nb | % | 0.15 | 1.25 | 3 |
| Mo | % | 0.15 | 5.5 | 26 |
| W | % | 2 | 3 | 1 |

Derived from 39 grades in this category with a recorded value.

## Heat treatment

 1

| Operation | Min Temperature (°C) | Max Temperature (°C) | Grades |
|---|---|---|---|
| soft\_annealing | — | — | 1 |