X9940/EN26/40NiCrMo10 4/DIN1.6745/826M40 hot bar With Black/Turned/Grinded/Precision Ground
The steel is suited to applications where high surface pressures
exist and friction is to be resisted as in the case of severely
loaded gears, axles and pinions.
It is used extensively in most industry sectors for applications
requiring higher tensile strength and yield strength than 4140,
4340 or En25 can provide.
Australia AS 14442007 X9940
Germany W.Nr 1.6745 40NiCrMo10 4
Great Britain BS970: Part 3: 1991 826M40
BS970: 1955 EN26
Phosphorous 0.04 max
Sulphur 0.04 max
Process: EAF+LF+VOD+ Forged+Heat Treatment(optional)
Hot Forged: 80mm-1200mm
Black, Peeled K12, Cold Drawn, Turned & Polished H10, H11,
Precision Ground H9, H8
Ultrasonic test: According to SEP 1921-84 3Cc
Heat to 1150 to 1200°C and hold at temperature until throughly
soaked and suitable to forge. Do not forge below 850°C.
To harden EN26 first heat the component to 820 to 850°C and hold at
temperature until throughly soaked. Quench the EN26 component in
oil, water or polymer as required. EN26 can be flame or induction
hardened to achieve a high surface hardness.
To temper EN26 heat the component to the required tempering
temperature (450 to 660°C), thoroughly soak for 1 hour per 25mm
thickness of section, cool in air.
EN26 can be nitrided to give a surface hardness of up to 60HRc.
Heat to 500 to 530°C and hold for sufficient time to develop the
case depth required, no quenching is required.
To stress relieve EN26 heat the component to 640 to 660°C and hold
until temperature is uniform through the section. Soak the EN26
component for 1 hour per 25mm thickness of section and cool in air.