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	s_T\|s_0,2, MPa	σ_U, 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
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
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