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TYPICAL ANALYSIS
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826M40
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C.
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Si.
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Mn
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Ni.
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Cr.
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Mo.
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0.40%
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0.30%
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0.60%
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2.50%
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0.75%
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0.55%
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Mechanical Properties 826M40
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Heat
Treatment
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Tensile
Strength
Rm N/mm²
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Yield
Stress
Re N/mm²
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a% on
5.665ÖSo
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Impact
Izod J
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Impact
KCV J
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Proof
Stress
rp0.2
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Hardness
HB
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Size
mm
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V
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1000/1150
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835
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12
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34
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28
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820
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293/352
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>29≤250
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V
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1000/1150
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850
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12
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47
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42
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835
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293/352
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>29≤150
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W
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1075/1225
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925
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11
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27
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22
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910
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311/375
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>29≤250
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W
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1075/1125
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940
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11
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40
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35
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910
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311/375
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>29≤250
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Forging
Heat the 826M40 to 1150 to 1200°C and hold at temperature until throughly soaked and suitable to forge. Do not forge below 850°C.
Heat Treatment
To harden 826M40 first heat the component to 820 to 850°C and hold at temperature until throughly soaked. Quench the 826M40 component in oil, water or polymer as required. 826M40 can be flame or induction hardened to achieve a high surface hardness.
Tempering
Heat the 826M40 component to the required tempering temperature (450 to 660°C), thoroughly soak for 1 hour per 25mm thickness of section, cool in air.
Nitriding
826M40 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.
Stress Relieving
Heat the 826M40 component to 640 to 660°C and hold until temperature is uniform through the section. Soak the 826M40 component for 1 hour per 25mm thickness of section and cool in air.
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