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![Bearing steels](/images/uploads/a4ce0808-87e7-457c-b4d1-a43069c8ffdd/bearing-steel-category-races-and-balls-1920x1080.jpg)

Category · 17 grades

# Bearing steels

Bearing steels are high-carbon steels designed for rolling-element bearings and other components exposed to repeated contact loading. They are characterised by high hardness, wear resistance and resistance to rolling-contact fatigue after suitable heat treatment. They are used for bearing rings, races and rolling elements where reliable operation under cyclic loads is required.

| Grade | Material no. | C | Si | P | S | Cr | Mn |
|---|---|---|---|---|---|---|---|
| [SUJ4](/materials/jis/suj4 "SUJ4") | — | 0.95 - 1.1 | 0.15 - 0.35 | max 0.025 | max 0.025 | 1.3 - 1.6 | max 0.5 |
| [SUJ3](/materials/jis/suj3 "SUJ3") | — | 0.95 - 1.1 | 0.4 - 0.7 | max 0.025 | max 0.025 | 0.9 - 1.2 | 0.9 - 1.15 |
| [STB5](/materials/ks/stb5 "STB5") | — | 0.95 - 1.1 | 0.4 - 0.7 | max 0.025 | max 0.025 | 0.9 - 1.2 | 0.9 - 1.15 |
| [STB4](/materials/ks/stb4 "STB4") | — | 0.95 - 1.1 | 0.15 - 0.35 | max 0.025 | max 0.025 | 1.3 - 1.6 | max 0.5 |
| [SUJ5](/materials/jis/suj5 "SUJ5") | — | 0.95 - 1.1 | 0.4 - 0.7 | max 0.025 | max 0.025 | 0.9 - 1.2 | 0.9 - 1.15 |
| [100Cr2](/materials/din-en/100cr2 "100Cr2") | [1.3501](/materials/material-no/1.3501 "1.3501") | 0,90-1,05 | 0,15-0,35 | 0,03 | 0,025 | 0,40-0,60 | 0,25-0,45 |
| [105Cr4](/materials/din-en/105cr4 "105Cr4") | [1.3503](/materials/material-no/1.3503 "1.3503") | 1,00-1,10 | 0,15-0,35 | 0,03 | 0,025 | 0,90-1,15 | 0,25-0,40 |
| [1.3505](/materials/material-no/1.3505 "1.3505") | [1.3505](/materials/material-no/1.3505 "1.3505") | 0,93-1,05 | 0,15-0,35 | 0,025 | 0,015 | 1,35-1,60 | 0,25-0,45 |
| [100CrMnSi6-4](/materials/din-en/100crmnsi6-4 "100CrMnSi6-4") | [1.3520](/materials/material-no/1.3520 "1.3520") | 0,93-1,05 | 0,45-0,75 | 0,025 | 0,015 | 1,40-1,65 | 1,00-1,20 |
| [100CrMo7-3](/materials/din-en/100crmo7-3 "100CrMo7-3") | [1.3536](/materials/material-no/1.3536 "1.3536") | 0,93-1,05 | 0,15-0,35 | 0,025 | 0,015 | 1,65-1,95 | 0,60-0,80 |
| [100CrMnMoSi8-4-6](/materials/din-en/100crmnmosi8-4-6 "100CrMnMoSi8-4-6") | [1.3539](/materials/material-no/1.3539 "1.3539") | 0,93-1,05 | 0,40-0,60 | 0,025 | 0,015 | 1,80-2,05 | 0,80-1,10 |
| [X108CrMo17](/materials/din-en/x108crmo17 "X108CrMo17") | [1.3543](/materials/material-no/1.3543 "1.3543") | 0,95-1,20 | ≤1,00 | 0,04 | 0,015 | 16,0-18,0 | ≤1,00 |
| [S44004](/materials/uns/s44004 "S44004") | [1.3544](/materials/material-no/1.3544 "1.3544") | 0,95-1,10 | ≤1,00 | 0,025 | 0,015 | 16,0-18,0 | ≤1,00 |
| [X89CrMoV18-1](/materials/din-en/x89crmov18-1 "X89CrMoV18-1") | [1.3549](/materials/material-no/1.3549 "1.3549") | 0,85-0,95 | ≤1,00 | 0,04 | 0,015 | 17,0-19,0 | ≤1,00 |
| [80MoCrV42-16](/materials/din-en/80mocrv42-16 "80MoCrV42-16") | [1.3551](/materials/material-no/1.3551 "1.3551") | 0,77-0,85 | ≤0,40 | 0,025 | 0,015 | 3,90-4,30 | 0,15-0,35 |
| [X82WMoCrV6-5-4](/materials/din-en/x82wmocrv6-5-4 "X82WMoCrV6-5-4") | [1.3553](/materials/material-no/1.3553 "1.3553") | 0,78-0,86 | ≤0,40 | 0,025 | 0,015 | 3,90-4,30 | ≤0,40 |
| 1.3554 | [1.3554](/materials/material-no/1.3554 "1.3554") | 0,78-0,86 | ≤0,40 | 0,015 | 0,015 | 3,80-4,50 | ≤0,40 |

## Standards covering this category

 23

- [**DIN / EN***10 grades*](/materials/din-en "DIN / EN — 10 grades in this category")
- [**UNS***8 grades*](/materials/uns "UNS — 8 grades in this category")
- [**AISI / SAE***7 grades*](/materials/aisi-sae "AISI / SAE — 7 grades in this category")
- [**JIS***6 grades*](/materials/jis "JIS — 6 grades in this category")
- [**ASTM***5 grades*](/materials/astm "ASTM — 5 grades in this category")
- [**ČSN***4 grades*](/materials/csn "ČSN — 4 grades in this category")
- [**ISO***3 grades*](/materials/iso "ISO — 3 grades in this category")
- [**SAE AMS***3 grades*](/materials/ams "SAE AMS — 3 grades in this category")
- [**GB***3 grades*](/materials/gb "GB — 3 grades in this category")
- [**GOST***3 grades*](/materials/gost "GOST — 3 grades in this category")
- [**STN***3 grades*](/materials/stn "STN — 3 grades in this category")
- [**PN***3 grades*](/materials/pn "PN — 3 grades in this category")
- [**KS***3 grades*](/materials/ks "KS — 3 grades in this category")
- [**BS***2 grades*](/materials/bs "BS — 2 grades in this category")
- [**AFNOR***2 grades*](/materials/afnor "AFNOR — 2 grades in this category")
- [**UNE***2 grades*](/materials/une "UNE — 2 grades in this category")
- [**MSZ***2 grades*](/materials/msz "MSZ — 2 grades in this category")
- [**STAS***2 grades*](/materials/stas "STAS — 2 grades in this category")
- [**BDS***2 grades*](/materials/bds "BDS — 2 grades in this category")
- [**UNI***1 grade*](/materials/uni "UNI — 1 grade in this category")
- [**SS***1 grade*](/materials/ss "SS — 1 grade in this category")
- [**COPANT***1 grade*](/materials/copant "COPANT — 1 grade in this category")
- [**AS / NZS***1 grade*](/materials/as-nzs "AS / NZS — 1 grade in this category")

## Property ranges

 15

| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 590 | 730 | 2 |
| Re | N/mm² | 370 | 410 | 2 |
| A5 | % | 15 | 20 | 2 |
| Z | % | 40 | 45 | 2 |
| KCU | kJ/m² | 440 | 490 | 2 |
| HB | — | 179 | 229 | 7 |
| HRC | — | 58 | 58 | 1 |
| HRB | — | 94 | 95 | 2 |
| rho | g/cm³ | 7.56 | 7.85 | 12 |
| E | GPa | 211 | 211 | 1 |
| alpha | 10^-6/K | 13.4 | 13.6 | 1 |
| Ac1 | °C | 715 | 750 | 2 |
| Ac3 | °C | 735 | 910 | 2 |
| Ar3 | °C | 710 | 710 | 1 |
| Ar1 | °C | 635 | 688 | 2 |

Derived from 12 grades in this category with a recorded value.

## Composition range

 13

| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| C | % | 0.77 | 1.2 | 17 |
| O | % | 0.0015 | 0.0015 | 4 |
| Al | % | 0.05 | 0.05 | 4 |
| Si | % | 0.15 | 1 | 17 |
| P | % | 0.015 | 0.04 | 17 |
| S | % | 0.015 | 0.025 | 17 |
| V | % | 0.07 | 2 | 4 |
| Cr | % | 0.4 | 19 | 17 |
| Mn | % | 0.15 | 1.2 | 17 |
| Ni | % | 0.25 | 0.5 | 5 |
| Cu | % | 0.2 | 0.3 | 10 |
| Mo | % | 0.08 | 5.2 | 14 |
| W | % | 0.25 | 6.7 | 3 |

Derived from 17 grades in this category with a recorded value.

## Heat treatment

 3

| Operation | Min Temperature (°C) | Max Temperature (°C) | Grades |
|---|---|---|---|
| spheroidize\_annealing | — | — | 1 |
| quenching | 830 | 860 | 1 |
| annealing | — | — | 1 |

## Related guides

 1

- [**Bearing Steels and Rolling-Contact Fatigue**](/wiki/steel-families/bearing-steels-and-rolling-contact-fatigue "Bearing Steels and Rolling-Contact Fatigue")