Steel 9KHS

Designation

Name The value
Designation GOST Cyrillic 9ХС
Designation GOST Latin 9XC
Transliteration 9HS
By chemical elements 9CrС

Description

9KHS steel is used: for the manufacture of drills, reamers, taps, dies, chasers, milling cutters, machine stampley, stamps for cold work; critical parts whose material must have high wear resistance, fatigue strength under bending, torsion, contact loading, and elastic properties.

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 14-131-971-2001
Bars and shapes В32 GOST 5950-2000, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-2307-78, TU 14-11-245-88, TU 14-1-1271-75
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 0.85-0.95 ≤0.03 ≤0.03 0.3-0.6 0.95-1.25 1.2-1.6 ≤0.4 Rest ≤0.3 ≤0.15 ≤0.03 ≤0.2 ≤0.2
Fe is the basis.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Rolled steel in the delivery state
≥445 ≥790 ≥26 ≥54 ≥390 -
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- ≥110 ≥130 ≥26 ≥68 - -
Rolled steel. Isothermal annealing of 790-810 °C. the Temperature of isothermal aging 710 °C.
295-390 590-690 - 50-60 - 197-241
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- ≥65 ≥74 ≥41 ≥95 - -
- ≥42 ≥46 ≥52 - - -
- ≥20 ≥31 ≥54 - - -
- ≥15 ≥20 ≥83 ≥100 - -

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
KCU Toughness
HB Brinell hardness number

Physical characteristics

Temperature Е, HPa G, HPa r, kg/m3 R, Mr. · m
0 190 79 7830 400

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
Weldability does not apply to welded structures. A valid CCC.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1180 °C, the end - of 800 °C. the cooling of the workpiece cross-section up to 200 mm in the well.
Flock-sensitive sensitivity not sensitive
Machinability In hot-rolled condition with HB 221 Kn TV.SPL.=0.90 Kn b.St.=0.50