--- title: "Case hardening steels — 60 grades with composition — Page 2" description: "Case hardening steels are steels designed to develop a hard, wear-resistant surface while retaining a tough and ductile core. 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Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. ![Case hardening steels](/images/uploads/1e70294e-5141-44e2-aed7-7854c487fc3e/hardening-steel-category-case-hardened-gears-1920x1080.jpg) Category · 60 grades # Case hardening steels Case hardening steels are steels designed to develop a hard, wear-resistant surface while retaining a tough and ductile core. They are used for components such as gears, shafts and other machine parts exposed to contact wear and cyclic loading. | Grade | Material no. | C | P | S | Mn | Si | Cr | |---|---|---|---|---|---|---|---| | [20CrMoS2](/materials/din-en/20crmos2 "20CrMoS2") | [1.7311](/materials/material-no/1.7311 "1.7311") | 0,18-0,23 | 0,035 | 0,020-0,040 | 0,60-0,80 | 0,15-0,35 | 0,50-0,70 | | [20MoCrS3](/materials/din-en/20mocrs3 "20MoCrS3") | [1.7319](/materials/material-no/1.7319 "1.7319") | 0,17-0,23 | 0,025 | 0,020-0,040 | 0,60-0,90 | ≤0,40 | 0,40-0,70 | | [20MoCr3](/materials/din-en/20mocr3 "20MoCr3") | [1.7320](/materials/material-no/1.7320 "1.7320") | 0,17-0,23 | 0,025 | 0,035 | 0,60-0,90 | ≤0,40 | 0,40-0,70 | | [20MoCr4](/materials/din-en/20mocr4 "20MoCr4") | [1.7321](/materials/material-no/1.7321 "1.7321") | 0,17-0,23 | 0,025 | 0,035 | 0,70-1,00 | ≤0,40 | 0,30-0,60 | | [20MoCrS4](/materials/din-en/20mocrs4 "20MoCrS4") | [1.7323](/materials/material-no/1.7323 "1.7323") | 0,17-0,23 | 0,025 | 0,020-0,040 | 0,70-1,00 | ≤0,40 | 0,30-0,60 | | [25MoCr4](/materials/din-en/25mocr4 "25MoCr4") | [1.7325](/materials/material-no/1.7325 "1.7325") | 0,23-0,29 | 0,035 | 0,035 | 0,60-0,90 | 0,15-0,40 | 0,40-0,60 | | [25MoCrS4](/materials/din-en/25mocrs4 "25MoCrS4") | [1.7326](/materials/material-no/1.7326 "1.7326") | 0,23-0,29 | 0,035 | 0,020-0,035 | 0,60-0,90 | 0,15-0,40 | 0,40-0,60 | | [22CrMoS3-5](/materials/din-en/22crmos3-5 "22CrMoS3-5") | [1.7333](/materials/material-no/1.7333 "1.7333") | 0,19-0,24 | 0,025 | 0,020-0,040 | 0,70-1,00 | ≤0,40 | 0,70-1,00 | | [22CrV3](/materials/din-en/22crv3 "22CrV3") | [1.7511](/materials/material-no/1.7511 "1.7511") | 0,20-0,24 | 0,035 | 0,035 | 0,60-0,75 | ≤0,35 | 0,65-0,80 | | [SAE 1010](/materials/din-en/sae1010 "SAE 1010") | [1.9301](/materials/material-no/1.9301 "1.9301") | 0,08-0,13 | 0,03 | 0,05 | 0,30-0,60 | — | — | [Previous](/categories/case-hardening-steels "Previous") Page 2 of 2 ## Standards covering this category 28 - [**DIN / EN***60 grades*](/materials/din-en "DIN / EN — 60 grades in this category") - [**AISI / SAE***37 grades*](/materials/aisi-sae "AISI / SAE — 37 grades in this category") - [**UNS***33 grades*](/materials/uns "UNS — 33 grades in this category") - [**AFNOR***29 grades*](/materials/afnor "AFNOR — 29 grades in this category") - [**PN***28 grades*](/materials/pn "PN — 28 grades in this category") - [**GOST***26 grades*](/materials/gost "GOST — 26 grades in this category") - [**ČSN***24 grades*](/materials/csn "ČSN — 24 grades in this category") - [**SRPS***22 grades*](/materials/srps "SRPS — 22 grades in this category") - [**UNI***21 grades*](/materials/uni "UNI — 21 grades in this category") - [**UNE***20 grades*](/materials/une "UNE — 20 grades in this category") - [**ISO***20 grades*](/materials/iso "ISO — 20 grades in this category") - [**BS***19 grades*](/materials/bs "BS — 19 grades in this category") - [**JIS***19 grades*](/materials/jis "JIS — 19 grades in this category") - [**GB***16 grades*](/materials/gb "GB — 16 grades in this category") - [**MSZ***14 grades*](/materials/msz "MSZ — 14 grades in this category") - [**SS***12 grades*](/materials/ss "SS — 12 grades in this category") - [**BDS***11 grades*](/materials/bds "BDS — 11 grades in this category") - [**STN***10 grades*](/materials/stn "STN — 10 grades in this category") - [**STAS***10 grades*](/materials/stas "STAS — 10 grades in this category") - [**COPANT***8 grades*](/materials/copant "COPANT — 8 grades in this category") - [**KS***6 grades*](/materials/ks "KS — 6 grades in this category") - [**AS / NZS***5 grades*](/materials/as-nzs "AS / NZS — 5 grades in this category") - [**ÖNORM***5 grades*](/materials/onorm "ÖNORM — 5 grades in this category") - [**NBN***5 grades*](/materials/nbn "NBN — 5 grades in this category") - [**SFS***5 grades*](/materials/sfs "SFS — 5 grades in this category") - [**ASTM***3 grades*](/materials/astm "ASTM — 3 grades in this category") - [**SNV***3 grades*](/materials/snv "SNV — 3 grades in this category") - [**HRN***2 grades*](/materials/hrn "HRN — 2 grades in this category") ## Property ranges 18 | Property | Unit | Min | Max | Grades | |---|---|---|---|---| | Rm | N/mm² | 320 | 1570 | 20 | | Re | N/mm² | 390 | 1320 | 9 | | A | % | 7 | 20 | 6 | | A5 | % | 7 | 19 | 9 | | Z | % | 40 | 55 | 7 | | KCU | kJ/m² | 590 | 1130 | 8 | | HB | — | 85 | 269 | 38 | | HRB | — | 73 | 84 | 4 | | HV | — | 135 | 260 | 4 | | rho | g/cm³ | 7.63 | 7.85 | 60 | | E | GPa | 129 | 216 | 4 | | alpha | 10^-6/K | 10 | 15.6 | 4 | | lambda | W/(m·K) | 19 | 42 | 4 | | cp | J/(kg·K) | 495 | 706 | 3 | | Ac1 | °C | 715 | 750 | 6 | | Ac3 | °C | 773 | 850 | 6 | | Ar3 | °C | 675 | 755 | 4 | | Ar1 | °C | 625 | 665 | 4 | Derived from 60 grades in this category with a recorded value. ## Composition range 15 | Property | Unit | Min | Max | Grades | |---|---|---|---|---| | B | % | 0.0008 | 0.005 | 2 | | C | % | 0.07 | 0.31 | 60 | | N | % | 0.007 | 0.012 | 4 | | O | % | 0.002 | 0.002 | 2 | | Al | % | 0.01 | 0.05 | 11 | | Si | % | 0.1 | 0.5 | 59 | | P | % | 0.02 | 0.045 | 60 | | S | % | 0.01 | 0.05 | 60 | | V | % | 0.1 | 0.2 | 2 | | Cr | % | 0.1 | 2.1 | 49 | | Mn | % | 0.3 | 1.7 | 60 | | Ni | % | 0.1 | 4.75 | 22 | | Cu | % | 0.15 | 0.3 | 6 | | Mo | % | 0.05 | 0.5 | 24 | | Pb | % | 0.15 | 0.35 | 2 | Derived from 60 grades in this category with a recorded value. ## Heat treatment 9 | Operation | Min Temperature (°C) | Max Temperature (°C) | Grades | |---|---|---|---| | quenching | 780 | 1050 | 8 | | tempering | 200 | 750 | 8 | | annealing | 950 | 950 | 6 | | carburizing | — | — | 6 | | soft\_annealing | — | — | 6 | | spheroidize\_annealing | — | — | 3 | | normalizing | 900 | 960 | 3 | | quench\_and\_temper | — | — | 3 | | solution\_annealing | — | — | 1 | ## Related guides 2 - [**Case Hardening Methods for Steel**](/wiki/heat-treatment/case-hardening-methods-for-steel "Case Hardening Methods for Steel") - [**Steel Tempering Response and Secondary Hardening**](/wiki/heat-treatment/steel-tempering-response-and-secondary-hardening "Steel Tempering Response and Secondary Hardening")