Steel 9Х4М3Ф2АГСТ (ЭК42)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
9Х4М3Ф2АГСТ |
| Designation GOST Latin |
9X4M3F2AGCT |
| Transliteration |
9H4M3F2AGST |
| The chemical elements |
9Cr4Mo3V2NMnСTi |
| Name |
The value |
| Designation GOST Cyrillic |
ЭК42 |
| Designation GOST Latin |
EK42 |
| Transliteration |
EhK42 |
| The chemical elements |
- |
Description
9Х4М3Ф2АГСТ steel is used: for the manufacture of cutting and threading tools for machining high-strength and high-temperature materials; tool, working with high impact loads; tools for machining carbon and low alloy steels, cast iron and nonferrous metals.
Note
The high speed steel with increased strength and increased tendency to decarburization and combustion of the molybdenum.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В32 |
TU 14-19-95-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
N |
V |
Ti |
Mo |
| TU 14-19-95-90 |
0.87-0.97 |
≤0.03 |
≤0.03 |
0.55-0.75 |
4-4.5 |
0.5-0.7 |
≤0.5 |
The rest |
0.04-0.1 |
1.6-2.1 |
0.1-0.25 |
2.7-3.2 |
Fe is the basis.
According to TU 14-19-95-90, the steel is introduced by calculation and chemical analysis is not determined: boron - by 0.0030%, REM - by 0.080% and calcium by 0.080%. In the finished metal, deviations in chemical composition are allowed by mass fraction: carbon ± 0.030%, silicon ± 0.050%, manganese ± 0.10%, chromium ± 0.30%, molybdenum + 0.10 / -0.050%, vanadium ± 0, 10%, titanium ± 0.010%, nitrogen ± 0.010%. A residual mass fraction of tungsten not exceeding 0.60% is allowed.
Physical characteristics
| Temperature |
r, кг/м3 |
| 20 |
8300 |
A description of the physical symbols
| Name |
Description |
| r |
Density |
Technological properties
| Name |
The value |
| Macrostructure and contamination |
Requirements to the surface quality, macrostructure, depth bezoperatsionnogo layer hot-rolled and forged bars on the other 14-19-95-90 must meet the requirements of GOST 19265. Depth bezoperatsionnogo layer of bars is determined according to GOST 1763 method M (etching in 4% solution of nitric acid in ethyl alcohol). |
| Microstructure |
Grain size of austenite steel after quenching should be not larger than 8 rooms. The austenite grain control on the samples after quenching in oil with 1205-1220 °C. the holding Time for hardening samples - according to GOST 19265. |
| Features of production |
Bars hot rolled and forged on the other 14-19-95-90 are supplied in the annealed condition according to the mode of the manufacturer, with hardness not exceeding 269 HB (indentation diameter not less than 3.7 mm). Hardness of the samples after quenching and two-three times of the holiday must be at least 62 HRC. To control the hardness after quenching the samples subjected to heat treatment regime: Quenching in oil with 1205-1220 °C, two to three-fold vacation at 550-560 °C with exposure for 1 hour and subsequent air cooling. The holding time for hardening of the samples must meet the requirements of GOST 19265. |
| Grindability |
Satisfactory. |
