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Steel R9M4K8

Steel R18F2K8M (EP379) Steel R9F5 (EI706) Steel R9M4K8-MP (DI102-MP) Steel R9M4K8 Steel R9M4K6S (EP722) R9K5 steel P9 steel Steel R8F2K8M5 (EP658) Steel R7M2F6-MP (DI100-MP) Steel R6M5F3-MP (DI99-MP) R6M5F3 steel Steel R6M5K5-MP (DI101-MP) R6M5K5 steel R6M5 steel P6AM5 steel P2AM9K5 steel Steel R18K5F2 (EI940) R18 steel R14F4 steel Steel R13F4K5 (EP600) Steel R12F3K10M3 (EP682) R12F3 steel Steel R12F2K8M3 (EP657) Steel R12F2K5M3 (EP863) Steel R12MF5-MP (DI70-MP) Steel R12M3K5F2-MP (DI103-MP) Steel 9X4M3F2AGST (EK42) 75KhMF steel Steel 11R3AM3F2 (EP894) Steel 11M5F

Designation

Name The value
Designation GOST Cyrillic Р9М4К8
Designation GOST Latin P9M4K8
Transliteration R9M4K8
The chemical elements -

Description

R9M4K8 steel is used: for the manufacture of tools used in the processing of high-strength stainless and heat resisting steels, alloys and superior alloy steels in terms of increased heating of the cutting edge (cutting tool, milling cutters, shaped cutters, core drills, taps).

Note

Steel has a high tendency to decarburization.

Standards

Name Code Standards
Sectional and shaped rolling В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Sheets and stripes В33 GOST 4405-75
Sectional and shaped rolling В32 GOST 7417-75, GOST 14955-77, GOST 19265-73, TU 14-11-245-88

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Mo W Co
GOST 19265-73 1-1.1 ≤0.03 ≤0.03 0.2-0.5 3-3.6 0.2-0.5 ≤0.6 The rest ≤0.25 2.3-2.7 3.8-4.3 8.5-9.5 7.5-8.5
Fe is the basis.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, %
Rolled steel. Delivery condition
≥540 ≥960 ≥7 ≥10

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

Physical characteristics

Temperature Е, ГПа G, ГПа r, кг/м3 l, Вт/(м · °С)
0 229 87 8300 -
20 229 - 8300 -
100 - - - 25
200 - - - 27
300 - - - 28
400 - - - 29
500 - - - 30
600 - - - 31
700 - - - 32
900 - - - 32

A description of the physical symbols

Name Description
Е The normal elasticity modulus
r Density
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Forging temperature Start - 1180 °C, the end - 880 °C. Cooling in the wells at 750-800 C.
Grindability Reduced
Viscosity reduced
Resistance to wear increased

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