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Steel R9M4K8

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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