Steel 50Kh14MF (ЗИ128)

Designation

Name	The value
Name	The value
Designation GOST Cyrillic	50Х14МФ
Designation GOST Latin	50X14MF
Transliteration	50H14MF
By chemical elements	50Cr14MoV

Name	The value
Name	The value
Designation GOST Cyrillic	ЗИ128
Designation GOST Latin	ZI128
Transliteration	ZI128
By chemical elements	ЗИ128

Description

50Kh14MF 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
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
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	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	HB, MPa
Section, mm	s_T\|s_0,2, MPa	σ_U, 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
Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
y	The relative narrowing
HB	Brinell hardness number

Technological properties

Name	The value
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.