709M40T / EN19T Bright / black 1% chromium molybdenum steel


BS970: 1955 BS970: 1991 COLOUR CODE DESCRIPTION
EN19T709M40Tblue/yellowBright / black 1% chromium molybdenum steel
CHEMICAL ANALYSIS
Car0.36 / 0.44
Sil0.10 / 0.40
Mang0.70 /1.00
Phos0.035 max
Sul0.040 max
Chr0.90 / 1.20
Moly0.25 / 0.35
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 709M40T
BRITISH BS 970:1955 EN19T
GERMAN DIN 42CrMo4
FRENCH AFNOR42CD4
SWEDISH SS2244
AMERICAN SAE4140
EUROPEAN STEEL NO.1.7225
EUROPEAN STEEL NAME42CrMo4
EUROPEAN STANDARDEN10277-5
QUICK VIEW SYSTEM
MACHINEABILITY40
WELDABILITYPre / post head precaution required
HARDENABILITYHigh strength up to 60mm dia
SELECTION GUIDE AND USAGE EXAMPLESGood tensile, ductility and shock resistance. Can be induction hardened to give resistance to wear


SIZES.

Size (ins. dia) 1/25/83/47/811.1/81.1/41.3/81.1/21.5/81.3/422.1/42.1/2
3             



Size (mm. dia) 10.0045.0050.0060.00