Steel KH12MF

Designation

Name The value
Designation GOST Cyrillic Х12МФ
Designation GOST Latin X12MF
Transliteration H12MF
By chemical elements Cr12MoV

Description

Steel KH12MF apply: when required a larger viscosity than that of steel grade 12X — for the manufacture of cold stamps high resistance to abrasion (mainly with working part rounded), not exposed to strong shocks and jolts; die plates and dies, eyes for the calibration metal rod under the knurling thread; bending and forming dies, complex dies sections body, which in the hardening should not be subjected to significant volume changes and warping; matrices and punches blanking and cutting dies; stampings of the active parts of electrical machines and electromagnetic systems of electric devices.
For the manufacture of rollers for the forming of complex shapes; sections of the different stamping dies complex forms; complex matrices dinoprostone in sheet metal forming, master gears, rolling dies, dies, matrices and punches blanking, cutting dies (including combined and sequential) with a complex configuration working parts; stampings of the active parts of electrical machines.

Standards

Name Code Standards
Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Sheets and strips В33 GOST 4405-75, TU 14-1-1481-76, TU 14-131-971-2001
Bars and shapes В32 GOST 5950-2000, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-781-73, TU 14-11-245-88
Blanks. Of the workpiece. Slabs В31 OST 24.952.01-89

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 5950-2000 1.45-1.65 ≤0.03 ≤0.03 0.15-0.45 11-12.5 0.1-0.4 ≤0.4 Rest ≤0.3 0.15-0.3 ≤0.03 0.4-0.6 ≤0.2
Fe is the basis.

Mechanical properties

σU, MPa d5, % y, %
Samples of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 1.1 mm/min, strain rate of 0.0004 1/s
≥140 ≥44 ≥68
≥125 - ≥58
≥81 ≥46 ≥54
≥46 - ≥49
≥25 ≥48 ≥48

Description mechanical marks

Name Description
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing

Physical characteristics

Temperature r, kg/m3 R, Mr. · m a, 10-6 1/°C
20 7700 580 -
300 - - 109
600 - - 114
800 - - 122

A description of the physical symbols

Name Description
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Weldability Does not apply to welded structures.
Склонность к отпускной хрупкости Inclined.
The temperature of forging Start - 1140 °C, the end - 850 °C. Cooling in the pits or thermostats.
Machinability In hot-rolled condition in NV 217-228 blower SB=710 MPa Kn TV.SPL.=0,80 Kn b.St.=0,3.
Sanding behaviour Satisfactory.