EN40B EN40
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EN40B is a chromium-molybdenum nitriding steel usually supplied in the hardened and tempered condition, which offers high wear resistance together with good toughness and ductility. It is characterised by its suitability for nitriding, which can give a hard wear resistant core in the range of 61-65Rc. The relatively low temperature of the nitriding process produces components with a scale free surface, and minimum distortion.
TYPICAL ANALYSIS |
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C. |
Si. |
Mn. |
Cr. |
Mo. |
0.25% |
0.30% |
0.60% |
3.25% |
0.55% |
Hardening:
Heat uniformly to 880/910C, soak until heated through. Quench in oil.
Tempering:
Heat uniformly and thoroughly at the selected tempering temperature, between 570C to 700C.
Heat
Treatment |
Tensile
Strength
Rm N/mm² |
Yield
Stress
Re N/mm² |
a% on
5.665ÖSo |
Impact
Izod J |
Impact
KCV J |
Hardness
HB |
Size
mm |
T |
850/1000 |
650 |
13 |
40 |
35 |
248/302 |
>150≤250 |
T |
850/1000 |
680 |
13 |
54 |
50 |
248/302 |
>6≤150 |
U |
925/1075 |
755 |
12 |
47 |
42 |
269/331 |
>6≤150 |
Available sections:
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