Steel Р8Ф2К8М5 (ЭП658)
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Designation
| Name | The value |
|---|---|
| Designation GOST Cyrillic | Р8Ф2К8М5 |
| Designation GOST Latin | P8F2K8M5 |
| Transliteration | R8F2K8M5 |
| The chemical elements | - |
| Name | The value |
|---|---|
| Designation GOST Cyrillic | ЭП658 |
| Designation GOST Latin | EP658 |
| Transliteration | EhP658 |
| The chemical elements | - |
Description
Р8Ф2К8М5 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 | 1.8-2.5 | 4.6-5.2 | 5.5-6 | 7.5-8.5 |
According to TU 14-1-2966-80 the chemical composition is given for steel grade P8F2K8M5 (EP658). In the steel, the proportion of manganese is exceeded by 0.10%.
In the steel P8F2K8M5 (EP658) the following technological additives are introduced according to the calculation in quantities:
- titanium - 0.02-0.10%,
- boron - 0.001-0.003%,
- lanthanum - 0.001-0.003%,
- nitrogen - 0.030-0.070%.
Permissible deviations from the norms of chemical composition in accordance with GOST 19265.
In the steel P8F2K8M5 (EP658) the following technological additives are introduced according to the calculation in quantities:
- titanium - 0.02-0.10%,
- boron - 0.001-0.003%,
- lanthanum - 0.001-0.003%,
- nitrogen - 0.030-0.070%.
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 Р8Ф2К8М5 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; Carbide heterogeneity of steel is controlled by the method and scale №1 GOST 19265 on samples thermally treated under the regime: Heating for hardening to 1210-1240 °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). over 80 mm to 100 mm - 6 points. |
| 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 630 °C. |
