Steel Р12Ф2К8М3 (ЭП657)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
Р12Ф2К8М3 |
| Designation GOST Latin |
P12F2K8M3 |
| Transliteration |
R12F2K8M3 |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП657 |
| Designation GOST Latin |
EP657 |
| Transliteration |
EhP657 |
| The chemical elements |
- |
Description
Р12Ф2К8М3 steel is used: for the production of rolled used in the manufacture of a special tool cutting properties which are retained to a temperature of 650 °C.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В32 |
TU 14-1-2966-80 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
V |
Mo |
W |
Co |
| TU 14-1-2966-80 |
0.95-1.05 |
≤0.03 |
≤0.035 |
≤0.4 |
3.8-4.4 |
≤0.5 |
≤0.4 |
1.8-2.4 |
2.8-3.4 |
11.5-12.5 |
7.5-8.5 |
According to TU 14-1-2966-80 the chemical composition is given for steel grade P12F2K8M3 (EP657). In the steel, the proportion of manganese is exceeded by 0.10%.
Permissible deviations from the norms of chemical composition in accordance with GOST 19265.
Technological properties
| Name |
The value |
| Macrostructure and contamination |
In the macrostructure of bars of steel Р12Ф2К8М3 should not be podnasadochnogo of rychlosti, residues shrinkage, delamination, bubbles, cracks. When assessing the allowed macrostructure: Central porosity - no more than points 1 - for bars with diameter or thickness up to 50 mm; not more than a score of 2 for bars with diameter or thickness greater than 50 mm to 100 mm inclusive. Fracture of steel should be homogeneous, fine-grained. Carbide inhomogeneity in steel depending on the size of the cross section shall not exceed the standards (maximum permissible score of carbide heterogeneity): up to 20 mm - 2 points; over 20 up to 40 mm - 3 points; St. 40 to 60 mm. - 4 points; over 60 to 80 mm - 5 points; over 80 mm to 100 mm - 6 points. Carbide inhomogeneity of the steel is controlled by the method and scale №1 GOST 19265 on samples thermally treated under the regime: Heating for hardening up to 1230-1250 °C to + Leave for hours at 680-700 °C. Depth bezoperatsionnogo layer is determined according to GOST 1763. In the control according to the method of Sadovsky samples subjected to heat treatment regime: Heating for hardening up to 1230-1250 °C + Quenching in the first bath at 180-190 °C (extract 10 min) + annealing in the second bath at 540-560 °C (10 min exposure). |
| Microstructure |
Depth bezoperatsionnogo layer of steel must not exceed the side of 0.5 mm. plus 1% of the diameter of the circle, the sides of the square, the thickness of the strip. |
| Features of production |
Steel on the other 14-1-2966-80 supplied annealed with a hardness of not more than HB 269. The red hardness of steel should provide a hardness of not less than HRC58, after a four-hour tempering at the temperature of 640 °C. |
