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Material specification sheet Saarstahl - 42CrMo4 - 42CrMoS4

Material No.: 1.7225 1.7227 Material group: Chemical composition:

(Typical analysis in %)

Former brand name: Mo 40

International steel grades: BS: AFNOR: SAE: 708M40, 709M40, 708A42 42CD4 4140H, 4140RH

Steel for quenching and tempering according to DIN EN 10083

Steel 42CrMo4 42CrMoS4 C 0,42 0,42 Si 0,25 0,25 Mn 0,75 0,75 Cr 1,10 1,10 Mo 0,22 0,22 S <0,035 0,020 0,035 other (Pb) (Pb)

Application:

Alloyed heat treatable steel with a typical tensile strength of 900 1200 N/mm². For automotive and aircraft components with high toughness as axle journals, gears, tyres, push rods.

Hot forming and heat treatment:

Forging or hot rolling: Normalising: Soft annealing: Hardening: Tempering:

1100 - 850°C 850 - 880°C/air 680 - 720°C/furnace 820 - 860°C/oil, water 540 - 680°C/air max. 255 HB max. 241 HB

Mechanical Properties:

Treated for cold shearability +S: Soft annealed +A: Quenched and tempered, +QT:

Diameter d [mm] Thickness t [mm] 0,2% proof stress Rp0,2 [N/mm²] Tensile strength Rm [N/mm²] Fracture elongation A5 [%] Reduction of area Z [%] Notch impact energy ISO-V [J]

< 16 <8 min. 900 1100 - 1300 min. 10 min. 40 min. 30

>16 ­ 40 8<t<20 min. 750 1000 - 1200 min. 11 min. 45 min. 35

>40 ­ 100 20<t<60 min. 650 900 - 1100 min. 12 min. 50 min. 35

>100 ­ 160 60<t<100 min. 550 800 - 950 min. 13 min. 50 min. 35

>160 ­ 250 100<t<160 min. 500 750 - 900 min. 14 min. 55 min. 35

Information

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