817M40T / EN24T Bright / black 1.1/2% nickel chromium molybdenum steel


BS970: 1955 BS970: 1991 COLOUR CODE DESCRIPTION
EN24T817M40TblueBright / black 1.1/2% nickel chromium molybdenum steel
CHEMICAL ANALYSIS
Car0.36 / .044
Sil0.10 / 0.40
Mang0.45 / 0.70
Phos0.035 max
Sul0.040 max
Chr1.00 / 1.40
Moly0.20 / 0.35
Nick1.30 / 1.70
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 817M40T
BRITISH BS 970:1955 EN24T
GERMAN DIN 34NiCrMo6
FRENCH AFNOR35NCD6
SWEDISH SS2541
AMERICAN SAE4340
EUROPEAN STEEL NO.1.6582
EUROPEAN STEEL NAME34CrNiMo6
EUROPEAN STANDARDEN10277-5
QUICK VIEW SYSTEM
MACHINEABILITY40
WELDABILITYPre / post heat precaution required
HARDENABILITYHigh strength up to 100mm dia
SELECTION GUIDE AND USAGE EXAMPLESPopular direct hardening steel with good tensile, ductility, shock and wear resistance properties


SIZES.

Size (ins. dia) 3/81/25/83/47/811.1/81.1/41.3/81.1/21.5/81.3/41.7/82
2.1/42.1/22.3/43          



Size (mm. dia) 16.0020.0025.0030.0040.0050.0060.0065.0080.0090.0095.00100.00105.00110.00
120.00130.00140.00150.00160.00170.00180.00190.00200.00205.00220.00240.00250.00260.00
305.00