Steel
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40NiCrMo16
Specifications Composition
European standard:
Carbon............................................. 0.37
EN : 40NiCrMo16
Nickel…….…...………………………………… 3.70
AFNOR: 40NiCrMo16
Chromium.…………...………………………. 1.80
W.Nr : ~1.2766
Moybdenum ………………………………… 0.30
DIN : ~35NiCrMo16
Applications
• Die blocks
Physical properties • Die holders
• Bolsters
• Density: 7.9
• Drom stamp tups
• Cold heading dies
• Mean coefficient of expansion in m/m.°C:
- between 20°C and 200°C: 11.7 x 10-6
- between 20°C and 400°C: 12.5 x 10-6
- between 20°C and 600°C: 13.2 x 10-6
• Critical points:
Characteristics
- Ac 1: 670°C • High field stress and excellent impact strength
• Extremely low sensitivity to thermal shock
- Ac 3: 760°C
• Excellent hardenability
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• Brinnel hardness of approximately 269 in the softened condition.
Heat treatment
• Harden:
- Preheat to 650°C.
- Raise to 875°C
- Air cool or gas pressure quench
It is recommended that heating should take
place in a neutral atmosphere.
CCT Diagram
Austenitizing at 875°C
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Heat treatment Tempering curve
• Temper:
- to obtain the maximum hardness:
temper at 550°C
- for good toughness:
temper at 500°C minimum
Tempering curve
1 cm thick test piece
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Mechanical properties
Hardness level
Variation of impact strength
with hardness
Forging
• 1100/900°C.
Contact:
www.aubertduval.com
The data provided in this document represent typical or average values rather than maximum or minimum guaranteed values. The applications indicated for the grades described are given as guidance only in
order to help the reader in his personal assessment. Please note that these do not constitute a guarantee whether implicit or explicit as to whether the grade selected is suited to specific requirements.
Aubert & Duval’s liability shall not under any circumstances extend to product selection or to the consequences of that selection.
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