Steel 50Х14МФ (ЗИ128)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
50Х14МФ |
| Designation GOST Latin |
50X14MF |
| Transliteration |
50H14MF |
| The chemical elements |
50Cr14MoV |
| Name |
The value |
| Designation GOST Cyrillic |
ЗИ128 |
| Designation GOST Latin |
ZI128 |
| Transliteration |
ZI128 |
| The chemical elements |
ЗИ128 |
Description
50Х14МФ steel is used: for the manufacture of medical cutting tools (scalpels, removable blades); knives of high quality; cutting instrument for meat and fish processing industries; cold weapons.
Note
Corrosion resistant tool steel.
Steel keeps sharpening.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В32 |
TU 14-1-3909-85 |
| Sheets and stripes |
В33 |
TU 14-130-280-96 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Fe |
V |
Mo |
| TU 14-130-280-96 |
0.48-0.55 |
≤0.03 |
≤0.03 |
≤0.6 |
14-15 |
≤0.6 |
The rest |
0.1-0.15 |
0.45-0.8 |
Fe is the basis.
According to TU 14-130-280-96, the chemical composition is given for steel grade 50H14MF.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
Brinell hardness number, MPa |
| A hot rolled sheet of 2.0-3.9 mm annealed in delivery condition on the other 14-130-280-96 |
|
- |
≥970 |
≥12 |
- |
197-207 |
| Rod on the other 14-1-3909-85. Annealing in air 1050 °C + Vacation at 200 °C (longitudinal samples) |
| - |
≥380 |
≥700 |
≥22 |
≥58 |
- |
| - |
≥350 |
≥660 |
≥23 |
≥61 |
- |
| - |
≥310 |
≥620 |
≥23 |
≥61 |
- |
| - |
≥300 |
≥590 |
≥21 |
≥62 |
- |
| - |
≥290 |
≥550 |
≥20 |
≥60 |
- |
| - |
≥290 |
≥480 |
≥20 |
≥63 |
- |
| - |
≥210 |
≥410 |
≥22 |
≥64 |
- |
| - |
≥130 |
≥190 |
≥60 |
≥80 |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
Technological properties
| Name |
The value |
| Microstructure |
Steel after full annealing has a structure of granular pearlite 3-6 points. The microstructure of the steel after quenching from 900-1200 °C consists of martensite, austenite and carbides. Increasing the temperature of heating for hardening up to 1050 °C increases the amount of residual austenite (γ), and the hardness of the maximum. After quenching from 1050 °C, the austenitic grain size is No. 9 according to GOST 5639-65, the size of the carbides is 1.5-8 microns. |
| Features of heat treatment |
Steel is prone to cracking during rapid cooling. |
| Corrosion resistance |
50Х14МФ steel after quenching and low tempering has high resistance to pitting corrosion in chlorine environments. |
