Steel 50Х14МФ (ЗИ128)

Designation

Name The value
Designation GOST Cyrillic 50Х14МФ
Designation GOST Latin 50X14MF
Transliteration 50H14MF
By chemical elements 50Cr14MoV
Name The value
Designation GOST Cyrillic ЗИ128
Designation GOST Latin ZI128
Transliteration ZI128
By 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
Bars and shapes В32 TU 14-1-3909-85
Sheets and strips 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 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 properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % HB, 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
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
HB Brinell hardness number

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.