Drawing Specifications 1.0
MASSIVE HEAT TREATMENTS
CONVENTIONAL PRELIMINAR MASSIVE HEAT TREATMENTS
ANNEALINGS
Soft annealing Full annealing Spheroidal annealing Sub-critical spheroidal annealing Pendular spheroidal annealing Stress relief annealing
NORMALIZING Normalizing Normalizing and tempering Workability quench and tempering
PRELIMINAR ISOTHERMAL MASSIVE HEAT TREATMENTS Isothermal annealing Spheroidal isothermal annealing
CONVENTIONAL FINAL MASSIVE HEAT TREATMENTS Hardening and stress relief tempering Hardening and tempering Martempering and stress relief tempering Stress relief tempering Tempering Quench and tempering
FINAL ISOTHERMAL MASSIVE HEAT TREATMENTS Isothermal hardening or Bainitic hardening or Austempering or Isothermal quench and tempering
SELECTIVE HEAT TREATMENTS
SURFACE HARDENING Induction surface hardening and stress relief tempering Surface laser hardening ans stress relief tempering Flaming surface hardening and stress relief tempering EBM surface hardening and stress relief tempering
THERMOCHEMICAL TREATMENTS
CARBURIZING Carburizing, direct hardening and stress relief tempering Carburizing, indirect hardening and stress relief tempering Carburizing, double hardening and stress relief tempering Carburizing, hardening after isothermal maintenance and stress relief tempering
CARBONITRIDING Carbonitriding, direct hardening and stress relief tempering Nitriding
NITROCARBURIZING Ferritic nitrocarburizing Ferritic nitrocarburizing + oxidation Ferritic sulphidizing Ferritic sulphidizing + oxidation
MECHANICAL TREATMENTS Shot peening
SURFACE TREATMENTS
PHOSPHATION Zinc phosphation Manganese phosphationTreatment: EBM surface hardening and stress relief tempering
- Other names: Tempra superficiale con cannone elettronico
- Standard reference: UNI 10932 : 2001
- Conventional Symbol: TPS
- :
- HV30range:
EFFECTIVE HARDENING THICKNESS AND CLASSES
DEFINITION: EFFECTIVE HARDENING THICKNESS in surface hardening
For pieces hardened superficially and subjected to stress relief tempering ( Tmax < 180 °C ),
it is the distance between the external surface of the hardened layer and the internal surface where the hardness
assumes a conventional value HV1 ( named limit hardness )
calculated as a function of the minimum surface hardness demanded
Limit hardness ( HV1 ) = minimum surface hardness ( HV1 ) x 0.8
If the core hardness exceeds the limit hardness, it is assumed a conventional value equal to :
Limit hardness ( HV1 ) = core hardness ( HV1 ) + 100
If the value exceeds that of the established surface hardness , we have to utilise
a different method agreed between the two parts
Alternatively it is possible to define the effectvie hardness thickness as the distance from
the surface where the hardness HV1 is similar to the conventional hardness deducible from the graphic
of figure 1.1 as a function of the C content of the hardening material ( according to UNI 4847 : 1970 ).
For example the conventional hardness HV1 of a C50 steel it will be equal to about 490 HV1.
| Classi di Effective hardening thickness classes | min value [mm] | max value [mm] |
|---|---|---|
| Tps 2 | 0.20 | 0.40 |
| Tps 3 | 0.30 | 0.60 |
| Tps 5 | 0.50 | 1.00 |
| Tps 10 | 1.00 | 2.00 |
| Tps 15 | 1.50 | 2.50 |
| Tps 20 | 2.00 | 3.50 |
| Tps 30 | 3.00 | 5.00 |
| Tps 40 | 4.00 | 6.00 |
| Tps 50 | 5.00 | 7.00 |
| Tps 60 | 6.00 | 9.00 |
| Tps 70 | 7.00 | 10.00 |
| Tps 80 | 8.00 | 11.00 |
| Tps 90 | 9.00 | 13.00 |
| Tps 100 | 10.00 | 14.00 |
| Tps 120 | 12.00 | 17.00 |
| Tps 150 | 15.00 | 20.00 |
| Symbols of effective hardening thickness classes | Classes and test methods of the surface hardness | Tolerance | |
|---|---|---|---|
| Tps 2 - Tps 3 - Tps 5 | 500 HV5 | + 100 HV | |
| 560 HV5 | + 100 HV | ||
| 600 HV5 | + 150 HV | ||
| 85 HR15N | + 3 HR15N | ||
| 88 HR15N | + 2 HR15N | ||
| 90 HR15N | + 2 HR15N | ||
| Tps 10 ÷ Tps 150 | 50 HRC | 58 HRC | + 4 HRC |
| 51 HRC | 59 HRC | ||
| 52 HRC | 60 HRC | ||
| 53 HRC | 61 HRC | ||
| 54 HRC | 62 HRC | ||
| 55 HRC | 63 HRC | ||
| 56 HRC | 64 HRC | ||
| 57 HRC | 65 HRC | ||
