UNI 40 NiCrMo 3 Structural and constructional steels
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UNI 40 NiCrMo 3 Chemical Composition
UNI 7847: 1979 / Hot rolled, unalloyed and alloyed special steel products, bars and coils, for surface hardening. Qualities, requirements and tests
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UNI 40 NiCrMo 3 Physical Properties
Temperature
This material has 225 properties — only a subset is shown here.
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UNI 40 NiCrMo 3 Heat Treatments
- Material is normally supplied in the annealed or normalised condition. The values shown in the mechanical properties table apply to the following conditions: TC: Annealed. TD: Normalised. TF: Hardened and tempered. Spheroidised: Spheroidise annealed. Annealed: Annealed to obtain a structure with a controlled hardness. Heat treated: Normalised or hardened and tempered followed by surface hardening followed by stress relieving at 140 to 180°C for one hour (to achieve the minimum surface hardness value specified after flame or induction hardening followed by stress relieving). Anneal at 640 - 680°C. Normalise at 850 - 880°C. Harden from 830 - 860°C and temper at 540 - 680°C for at least 1 hour.
- Material is normally supplied in the hot rolled condition but, subject to agreement, may be supplied in one of the following conditions: Soft Annealed (SA) to a maximum hardness by annealing at 640 - 680°C. Spheroidise Annealed (Spheroidised). Annealed to obtain a ferritic/pearlite structure (Annealed). Hardened and Tempered (H+T). The H+T values shown in the mechanical properties table are obtained from a test piece hardened by oil quenching from 830 - 850°C followed by tempering at 550 - 650°C for at least 1 hour. The temperature of the oil must be between 15 - 60°C. The Rockwell C Scale hardness minimum value (Heat Treated condition) shown in the mechanical properties table is the surface hardness which must be obtained whether material is in the normalised condition and subsequently surface hardened or whether the material is in the hardened and tempered condition and subsequently surface hardened; Both treatments are followed by tempering at 140-180°C for approximately 1 hour. The specification gives a normalising treatment of 850 - 880°C.
UNI 40 NiCrMo 3 Mechanical Properties
Temperature
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UNI 40 NiCrMo 3 International Equivalent Materials
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- 94Cross References
- 16Composition
- 15Mechanical Properties
- 3Physical Properties
- 5Heat Treatment
- -Metallography
- -Machinability
- -Stress-Strain
- -Formability
- -Fatigue
- -Fracture
- -Creep
- -Joints
- -Coatings
- -Dimensions
- -Tribology
- -Corrosion
- -Ageing
- -Weatherability
- -Irradiation
- 92Total Suppliers