Gas nitriding can be applied to unalloyed steels and irons to produce a corrosion- and wear-resistant nitride layer. In alloy steels that contain nitride-forming alloy elements (Cr, Mn, Mo, V, W, Al, Ti) a deeper diffusion layer develops.
Nitriding materials include a number of steel types:
- Carbon steels
- Hardenable alloy steels
- Special nitriding steels such as Nitralloy
- High alloy steels: tool steels, heat-resistant steels (e.g. valve steels) etc.
- Stainless steels (ferritic, martensitic, austenitic, PH grades)
- Cast iron (grey or nodular)
Material tables
| NITRIDING STEELS |
|---|
| Grade AISI | Grade UNI | Main alloy components | Core Hardness HV/HRC | Surface Hardness Hv1 |
|---|---|---|---|---|
| N135M | 38CrAlMoA | C=0.38 Cr=1.7 Mo=0.3 Al=1 | 350/36 | 1190-1290 |
| Nitralloy N | C=0.35 Cr=115 Ni=3.5 Mo=0.25 | 350/36 | 1100-1200 | |
| 34CrAlNi7 | C=0.42 Cr=3 Mo=1.2 V=0.20 | 350/36 | 1190-1290 | |
| 42CrMoV12 | 42CrMoV12 | C=0.42 Cr=3 Mo=1.2 V=0.20 | 490 / 48 | 1050-1150 |
| 31CrMo12 | C=0.32 Cr=3 Mo=0.4 | 320 / 32 | 870-920 | |
| 30CrMoV9 | 320 / 32C=0.30 Cr=2.5 Mo=0.2 V=0.15 | 320 / 32 | 900-930 | |
| 25CrMo20 | C=0.25 Cr=6 Mo=0.20 | 280 / 27 | 1000-1100 |
| OTHER HARDENABLE ALLOY STEELS |
|---|
| GRADE AISI | GRADE UNI | MAIN ALLOY COMPONENTS | CORE HARDNESS HV/HRC | SURFACE HARDNESS HV1 |
|---|---|---|---|---|
| 4130 | 30CrMo4 | C=0.30 Cr=1 Mo=0.2 | 300 / 30 | 640 – 680 |
| 4140 | 42CrMo4 | C=0.40 Cr=1 Mn=0.9 Mo=0.2 | 300 / 30 | 650 – 700 |
| 4340 | C=0.40 Cr=0.8 Ni=1.8 Mo=0.25 | 310 / 31 | 650 – 700 | |
| 30NiCrMo12 | C=0.30 Cr=0.8 Ni=2.8 Mo=0.12 | 310 / 31 | 600 – 650 | |
| 35NiCrMo15 | C=0.35 Cr=1.7 Ni=3.8 Mo=0.15 | 330 / 33 | 800 – 850 |
| CARBON STEELS |
|---|
| GRADE AISI | GRADE UNI | MAIN ALLOY COMPONENTS | CORE HARDNESS HV/HRC | SURFACE HARDNESS HV1 |
|---|---|---|---|---|
| 1010 | C10 | C=0.10 Mn=0.50 | 160 | 320 – 380 |
| 1020 | C20 | C=0.20 Mn=0.50 | 180 | 320 – 380 |
| 1030 | C30 | C=0.30 Mn=0.7 | 180 | 380 – 420 |
| 1045 | C45 | C=0.45 Mn=0.7 | 200 | 420 – 470 |
| 1060 | C60 | C=0.60 Mn=0.7 | 250 / 22 | 525 |
| CARBURIZING ALLOY STEELS |
|---|
| GRADE AISI | GRADE UNI | MAIN ALLOY COMPONENTS | CORE HARDNESS HV/HRC | SURFACE HARDNESS HV1 |
|---|---|---|---|---|
| 5115 | 16MnCr5 | C=015 Cr=0.8 Mn=0.9 | 180 | 660 – 720 |
| 20 MnCr5 | C=0.20 Cr=1.15 Mn=1.3 | 240 / 21 | 750 – 800 | |
| 8620 | C=0.20 Cr=0.5 Ni=0.6 Mo=0.2 | 190 | 500 – 520 | |
| 18NiCrMo5 | C=0.18 Cr=0.9 Mn=0.8 Ni=1.3 Mo=0.25 | 210 | 700 – 750 |
| TOOL STEELS |
|---|
| GRADE AISI | GRADE UNI | MAIN ALLOY COMPONENTS | CORE HARDNESS HV/HRC | SURFACE HARDNESS HV1 |
|---|---|---|---|---|
| D2 | C=1.5 Cr=12 Mo=1 V=1.1 Co=1 | 580 / 54 | 1270 – 1370 | |
| X150CrMo12 | C=1.5 Cr=12 Mo=0.8 | 580 / 54 | 1270 – 1370 | |
| H13 | AFNOR Z40 | C=0.40 Cr=5.2 Mo=1.5 V=1 | 480 / 48 | 1150 – 1280 |
| X38CrMoV5.1 | C=0.40 Cr=5.2 Mo=1.1 V=0.4 | 480 / 48 | 1180 – 1280 | |
| 40CrMnMo7 | C=0.40 Cr=2 Mn=1.5 Mo=0.2 | 340 / 34 | 870 – 930 | |
| M7 | DIN 1.3348 | C=1 Cr=3.8 Mo=9 W=1.8 V=2 | 787 / 63 | 1100 |
| M42 | DIN 1.3247 | C=1.1 Cr=3.9 Mo=9.5 W=1.5 V=1.1 Co=8. | 865 / 66 | 1100 |
| STAINLESS STEEL |
|---|
| GRADE AISI | GRADE UNI | MAIN ALLOY COMPONENTS | CORE HARDNESS HV/HRC | SURFACE HARDNESS HV1 |
|---|---|---|---|---|
| X5CrNiMo18.10 | C=.07 Cr=18 Ni=10 Mo=2 | 230 | 1150 – 1250 | |
| 316L | X2CrNiMo18.10 | C=.03 Cr=18 Ni=12 Mo=2 | 230 | 1150 – 1250 |
| 440B | X90CrMoV18 | C=0.0 Cr=17 Mn=1 Si=1 Mo=0.75 | 420 / 43 | 1000 – 1350 |
| 17-4 PH | C=.07 Cr=16 Mn=1 Si=1 Ni=4 Cu=4 Nb=.3 | 300 / 30 | 950 – 1100 |
