722M24T / EN40BT Black 3% chromium molybdenum nitriding steel


BS970: 1955 BS970: 1991 COLOUR CODE DESCRIPTION
EN40BT722M24Tblue/blackBlack 3% chromium molybdenum nitriding steel
CHEMICAL ANALYSIS
Car0.20 / 0.28
Sil0.10 / 0.40
Mang0.45 / 0.70
Phos0.035 max
Sul0.040 max
Chr3.00 / 3.50
Moly0.46 / 0.65
MECHANICAL PROPERTIES
Tensile Strength N/MM2 Min Rm 850 / 1000
Yield Stress N/MM2 Min Rm 700
Elongation A Min % on 5.65√SO 9
Izod Min54
Kcv Min-
Proof Stress 0.2% N/MM2 Min680
Brinell Hardness248 / 302
INTERNATIONAL SPECIFICATION COMPARISON
BRITISH BS 970:1991 722M24T
BRITISH BS 970:1955 EN40BT
GERMAN DIN  
FRENCH AFNOR 
SWEDISH SS 
AMERICAN SAE 
EUROPEAN STEEL NO. 
EUROPEAN STEEL NAME 
EUROPEAN STANDARD 
QUICK VIEW SYSTEM
MACHINEABILITY35
WELDABILITYNot recommended
HARDENABILITYMedium strength nitriding
SELECTION GUIDE AND USAGE EXAMPLESAfter hardening produces very hard resistant case & core strength 55/65 t/sq". Shackle pins & ball joints


SIZES.

Size (mm. dia) 25.0032.0040.0051.0065.0080.0090.00105.00190.00