30KHM steel is used: for the manufacture of gears, shafts, axles, pins, nuts, bolts and various other parts operating at temperatures up to 450−500 °C.

Note

Structural steel high-quality chrome-molybdenum.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В32	GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, TU 14-1-5414-2001, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008
Bars and shapes	В22	GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Processing of metals by pressure. Forgings	В03	GOST 8479-70
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90, TU 14-1-904-74

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
GOST 4543-71	0.26-0.34	≤0.035	≤0.035	0.4-0.7	0.8-1.1	0.17-0.37	≤0.3	Rest	≤0.3	≤0.05	≤0.03	0.15-0.25	≤0.2

Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Quenching in oil at 880 °C + vacation at 540 °C, cooling in water or oil
≤15	-	735	930	11	45	765	-	-
Quenching in water from 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
100	-	700	830	17	65	137	-	27
Quenching + tempering (forgings)
100	-	395	615	17	45	481	187-229	-
Quenching in oil at 880 °C
-	200	1320	1520	12	50	69	-	49
Quenching in oil at 880 °C to + vacation at 650 °C
-	-	590	730	20	70	186	-	-
Normalization at 860 °C
100-150	-	350	600	16	45	392	-	-
Quenching in water from 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
80	-	760	890	14	64	108	-	30
Quenching + tempering (forgings)
100-300	-	440	635	16	45	579	197-235	-
Quenching in oil at 880 °C
-	300	1330	1450	11	51	49	-	45
Quenching in oil at 880 °C to + vacation at 650 °C
-	-	490	660	21	70	-	-	-
Annealing at 860-880 °C
100	-	300	550	18	45	-	-	-
Quenching in water from 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
120	-	690	840	18	63	118	-	25
Quenching + tempering (forgings)
100	-	440	635	14	40	530	197-235	-
Quenching in oil at 880 °C
-	400	1220	1370	12	55	69	-	42
Quenching in oil at 880 °C to + vacation at 650 °C
-	-	520	710	21	69	206	-	-
Quenching in water from 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
40	-	790	930	13	61	118	-	30
Quenching + tempering (forgings)
100	-	490	655	16	45	579	212-248	-
Quenching in oil at 880 °C
-	500	1080	1130	16	60	127	-	36
Quenching in oil at 880 °C to + vacation at 650 °C
-	-	480	630	22	75	199	-	-
Quenching in water from 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
60	-	740	870	16	64	127	-	31
Quenching in oil at 880 °C to + vacation at 650 °C
-	-	430	500	22	80	142	-	-
Quenching in oil at 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
100	-	610	780	18	64	147	-	25
Quenching in oil at 880 °C to + vacation at 650 °C
-	-	340	330	29	89	142	-	-
Quenching in oil at 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
80	-	660	790	17	67	137	-	25
A sample with a diameter of 6 mm, length 30 mm, pressed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	-	80	130	69	67	-	-	-
Quenching in oil at 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
120	-	620	750	16	63	137	-	-
A sample with a diameter of 6 mm, length 30 mm, pressed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	-	41	56	64	100	-	-	-
Quenching in oil at 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
40	-	650	820	17	71	147	-	27
A sample with a diameter of 6 mm, length 30 mm, pressed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	-	14	26	55	100	-	-	-
Quenching in oil at 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
60	-	630	800	17	69	157	-	27

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
HRC	Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature	Е, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
0	208	7820	-	230	-	-
20	208	7820	-	270	-	-
100	207	7800	46	-	116	462
200	204	7770	44	334	125	-
300	197	7740	42	425	132	462
400	188	7700	42	524	139	-
500	176	7660	39	628	138	-
600	160	-	37	757	146	-
700	-	-	36	-	143	-
800	-	-	32	-	-	-

A description of the physical symbols

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

Technological properties

Name	The value
Weldability	limited weldability. Welding methods: SMAW, ADS under flux and gas protection. Recommended heating and subsequent heat treatment.
Склонность к отпускной хрупкости	tend not
The temperature of forging	Start - 1260 °C, the end - 760 °C-800. Cross-section up to 100 mm are cooled in air, 101-300 mm - mulde.
Flock-sensitive sensitivity	insensitive
Machinability	After quenching and tempering at NV are 229-269 blower SB=930 MPa Kn TV.SPL.=0.7 Kn b.St.=0.3

Steel 30KHM

Designation

Description