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title: "Nitriding steels — 11 grades with composition"
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![Nitriding steels](/images/uploads/889b8529-6359-401d-af7b-c6c3e50479fa/nitriding-steels-category-hardened-gear-teeth-1920x1080.jpg)

Category · 11 grades

# Nitriding steels

Nitriding steels are alloy steels designed for nitriding, a surface-hardening treatment that produces a hard, wear-resistant surface while retaining a tough supporting core. They are used for gears, shafts, dies and other components requiring resistance to wear, repeated loading and dimensional change in service.

| Grade | Material no. | C | Cr | Si | P | S | Mn |
|---|---|---|---|---|---|---|---|
| [34CrAlNi7](/materials/din-en/34cralni7 "34CrAlNi7") | [1.2891](/materials/material-no/1.2891 "1.2891") | 0,35 | 1,7 | — | — | — | — |
| [34CrAl6](/materials/din-en/34cral6 "34CrAl6") | [1.8504](/materials/material-no/1.8504 "1.8504") | 0,30-0,37 | 1,20-1,50 | 0,15-0,35 | 0,035 | 0,035 | 0,60-0,90 |
| [34CrAlS5](/materials/din-en/34crals5 "34CrAlS5") | [1.8506](/materials/material-no/1.8506 "1.8506") | 0,30-0,37 | 1,00-1,30 | 0,15-0,40 | 0,1 | 0,07-0,11 | 0,60-0,90 |
| [34CrAlMo5-10](/materials/din-en/34cralmo5-10 "34CrAlMo5-10") | [1.8507](/materials/material-no/1.8507 "1.8507") | 0,30-0,37 | 1,00-1,30 | ≤0,40 | 0,025 | 0,035 | 0,40-0,70 |
| [1.8509](/materials/material-no/1.8509 "1.8509") | [1.8509](/materials/material-no/1.8509 "1.8509") | 0,38-0,45 | 1,50-1,80 | ≤0,40 | 0,025 | 0,035 | 0,40-0,70 |
| [31CrMo12](/materials/din-en/31crmo12 "31CrMo12") | [1.8515](/materials/material-no/1.8515 "1.8515") | 0,28-0,35 | 2,80-3,30 | ≤0,40 | 0,025 | 0,035 | 0,40-0,70 |
| [31CrMoV9](/materials/din-en/31crmov9 "31CrMoV9") | [1.8519](/materials/material-no/1.8519 "1.8519") | 0,27-0,34 | 2,30-2,70 | ≤0,40 | 0,025 | 0,035 | 0,40-0,70 |
| [15CrMoV5-9](/materials/din-en/15crmov5-9 "15CrMoV5-9") | [1.8521](/materials/material-no/1.8521 "1.8521") | 0,13-0,18 | 1,20-1,50 | ≤0,40 | 0,025 | 0,03 | 0,80-1,10 |
| [1.8523](/materials/material-no/1.8523 "1.8523") | [1.8523](/materials/material-no/1.8523 "1.8523") | 0,35-0,45 | 3,00-3,50 | 0,15-0,40 | 0,035 | 0,035 | 0,40-0,70 |
| [8CrMoV16-5](/materials/din-en/8crmov16-5 "8CrMoV16-5") | [1.8524](/materials/material-no/1.8524 "1.8524") | 0,04-0,12 | 3,70-4,30 | 0,10-0,40 | 0,025 | 0,035 | 0,85-1,20 |
| [34CrAlNi7-10](/materials/din-en/34cralni7-10 "34CrAlNi7-10") | [1.8550](/materials/material-no/1.8550 "1.8550") | 0,30-0,37 | 1,50-1,80 | ≤0,40 | 0,025 | 0,035 | 0,40-0,70 |

## Standards covering this category

 17

- [**DIN / EN***11 grades*](/materials/din-en "DIN / EN — 11 grades in this category")
- [**PN***7 grades*](/materials/pn "PN — 7 grades in this category")
- [**SRPS***5 grades*](/materials/srps "SRPS — 5 grades in this category")
- [**UNS***4 grades*](/materials/uns "UNS — 4 grades in this category")
- [**BS***4 grades*](/materials/bs "BS — 4 grades in this category")
- [**ČSN***4 grades*](/materials/csn "ČSN — 4 grades in this category")
- [**AFNOR***3 grades*](/materials/afnor "AFNOR — 3 grades in this category")
- [**UNE***3 grades*](/materials/une "UNE — 3 grades in this category")
- [**GOST***3 grades*](/materials/gost "GOST — 3 grades in this category")
- [**UNI***3 grades*](/materials/uni "UNI — 3 grades in this category")
- [**AISI / SAE***2 grades*](/materials/aisi-sae "AISI / SAE — 2 grades in this category")
- [**SS***2 grades*](/materials/ss "SS — 2 grades in this category")
- [**STN***2 grades*](/materials/stn "STN — 2 grades in this category")
- [**SAE AMS***1 grade*](/materials/ams "SAE AMS — 1 grade in this category")
- [**JIS***1 grade*](/materials/jis "JIS — 1 grade in this category")
- [**GB***1 grade*](/materials/gb "GB — 1 grade in this category")
- [**KS***1 grade*](/materials/ks "KS — 1 grade in this category")

## Property ranges

 15

| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 392 | 1300 | 6 |
| Re | N/mm² | 835 | 835 | 1 |
| A | % | 9 | 15 | 6 |
| A5 | % | 14 | 20 | 1 |
| Z | % | 50 | 50 | 1 |
| KCU | kJ/m² | 880 | 880 | 1 |
| HB | — | 229 | 255 | 6 |
| rho | g/cm³ | 7.57 | 7.85 | 11 |
| E | GPa | 137 | 209 | 1 |
| alpha | 10^-6/K | 11.5 | 14.9 | 1 |
| lambda | W/(m·K) | 20 | 33 | 1 |
| cp | J/(kg·K) | 496 | 676 | 1 |
| Ac1 | °C | 800 | 800 | 1 |
| Ac3 | °C | 940 | 940 | 1 |
| Ar1 | °C | 730 | 730 | 1 |

Derived from 11 grades in this category with a recorded value.

## Composition range

 10

| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| C | % | 0.04 | 0.45 | 11 |
| Al | % | 0.8 | 1.2 | 6 |
| Si | % | 0.1 | 0.4 | 10 |
| P | % | 0.025 | 0.1 | 10 |
| S | % | 0.03 | 0.11 | 10 |
| V | % | 0.05 | 0.3 | 4 |
| Cr | % | 1 | 4.3 | 11 |
| Mn | % | 0.4 | 1.2 | 10 |
| Ni | % | 0.85 | 1.15 | 2 |
| Mo | % | 0.15 | 1.1 | 9 |

Derived from 11 grades in this category with a recorded value.

## Heat treatment

 7

| Operation | Min Temperature (°C) | Max Temperature (°C) | Grades |
|---|---|---|---|
| soft\_annealing | — | — | 3 |
| quenching | — | — | 3 |
| tempering | — | — | 3 |
| nitriding | — | — | 3 |
| quench\_and\_temper | — | — | 1 |
| annealing | — | — | 1 |
| normalizing | — | — | 1 |