EN24 - 817M40 Black (As rolled, forged or heat treated)(ALLOY STEEL) (Direct hardening or nitriding) (NickelChromium/Moly)

Equivalents:BS970 Part 1 1983, 817M40BS970 of 1955 EN24German W. Stoff No. 1.6582 | American AISI 4340

Chemical:Composition %CarbonSiliconManganeseNickelChromiumMolybdenum

= 0,36 - 0,44= 0,10 - 0,35= 0,45 - 0,70= 1,30 - 1,70= 1,00 - 1,40= 0,20 - 0,35

Characteristics:• A 6% allowance should always be made for removal of surface defects during machining• Machinability good (tends to self harden)• Ideal for 60 ton tensile applications up to 250mm max.• This material is often ordered in the annealed, as rolled or as forged condition for machining. Subsequent heat treatment is used to achieve higher tensility. i.e. condition T, U, V, W, X, Y and Z

Typical Applications:Auto Main Shafts/Heavy Duty Shafts (mining industry)Heavy Axles, BoltsHigh Duty Connecting RodsHigh Tensile Bolts and StudsDifferential Shafts, Pinion SleevesMandrels for Tube MillsPower Transmission Slide Gears and Slide Cams

HeatTreatment

ConditionTons/SQ. inch

TensileStrengthRM MPA

Yield StressRE MPA

A min on5,65 So

HardnessHB

ImpactIZODFT.Lb

KCVJoules

LimitedRulingSection

mm

T

UVWXYZ

55/6555/6560/7065/7570/8075/8580/90100

850/1000850/1000925/10751000/11501075/12251150/13001225/1375

1550

650680755850940

102010951235

131312121110105

304035353025188

248/302248/302269/331293/352311/375341/401363/429

444

2501501006329292929

355042423528219

Mechanical Properties

Gun BarrelsHydraulic Rams/Pistons

RP 0,2MPA

635665740835925

100510801125

SulphurPhosphorus

= 0,035 max= 0,040 max

Rolled

HeatTreated

Tel: +27 (0)11 865 4939. Fax: +27 (0)11 902 8995. e-mail: sales@specialsteels.co.za

EN24 - 817M40

Product Information: