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: Carburizing, direct hardening and stress relief tempering
- Other names: none
- Standard reference: UNI 5381 : 1999
- Conventional Symbol: Cmt
- :
- HV30range:
EFFECTIVE HARDENING THICKNESS AND CLASSES
DEFINITION: EFFECTIVE HARDENING THICKNESS IN CARBURIZING AND HARDENING
For pieces carburized and hardened, it is represented from the distance of the surface
of the hardened layer from the point where his hardness assumes the conventional value HV 1/15 = 550
| Effective hardening thickness classes | nominal values [mm] | min value [mm] | max value [mm] |
|---|---|---|---|
| Cmt 2 | 0.20 | 0.15 | 0.25 |
| Cmt 3 | 0.30 | 0.25 | 0.40 |
| Cmt 4 | 0.40 | 0.30 | 0.50 |
| Cmt 5 | 0.50 | 0.40 | 0.60 |
| Cmt 6 | 0.60 | 0.50 | 0.70 |
| Cmt 7 | 0.70 | 0.55 | 0.85 |
| Cmt 8 | 0.80 | 0.65 | 0.95 |
| Cmt 9 | 0.90 | 0.75 | 1.05 |
| Cmt 10 | 1.00 | 0.85 | 1.15 |
| Cmt 11 | 1.10 | 0.95 | 1.25 |
| Cmt 12 | 1.20 | 1.00 | 1.40 |
| Cmt 13 | 1.30 | 1.10 | 1.50 |
| Cmt 14 | 1.40 | 1.20 | 1.60 |
| Cmt 15 | 1.50 | 1.30 | 1.70 |
| Cmt 16 | 1.60 | 1.40 | 1.80 |
| Cmt 17 | 1.70 | 1.50 | 1.90 |
| Cmt 18 | 1.80 | 1.60 | 2.00 |
| Cmt 19 | 1.90 | 1.70 | 2.10 |
| Cmt 20 | 2.00 | 1.75 | 2.25 |
| Cmt 21 | 2.10 | 1.85 | 2.35 |
| Cmt 22 | 2.20 | 1.95 | 2.45 |
| Cmt 23 | 2.30 | 2.05 | 2.55 |
| Cmt 24 | 2.40 | 2.15 | 2.65 |
| Cmt 25 | 2.50 | 2.20 | 2.80 |
| Cmt 30 | 3.00 | 2.65 | 3.35 |
| Cmt 35 | 3.50 | 3.10 | 3.90 |
| Cmt 40 | 4.00 | 3.50 | 4.50 |
| Effective hardening thickness classes | Surface hardness class | Tolerance |
|---|---|---|
| Cmt 2 Cmt 3 | 500 HV5 | + 100 HV |
| 600 HV 5 | + 100 HV | |
| 700 HV 5 | + 150 HV | |
| 85 HR 15N | + 3 HR 15N | |
| 88 HR 15N | + 2 HR 15N | |
| 90 HR 15N | + 2 HR 15N | |
| Cmt 4 Cmt 5 | 75 HRA | + 3 HRA |
| 78 HRA | + 3 HRA | |
| 81 HRA | + 3 HRA | |
| Cmt 6 and more | 52 HRC | + 3 HRC |
| 53 HRC | + 3 HRC | |
| 54 HRC | + 3 HRC | |
| 55 HRC | + 3 HRC | |
| 56 HRC | + 3 HRC | |
| 57 HRC | + 3 HRC | |
| 58 HRC | + 3 HRC | |
| 59 HRC | + 3 HRC | |
| 60 HRC | + 3 HRC | |
| 61 HRC | + 3 HRC | |
| 62 HRC | + 3 HRC |