30KHN3A steel is used: for the manufacture of rims of the driven wheels, forged rings, tractor gear trains, gear and other upgradeable parts. Can be used at temperatures up to -80 °C (with a wall thickness of not more than 100 mm).

Note

Structural steel high-quality stainless.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В22	GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Bars and shapes	В32	GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST В 5160-89, OST 1 92044-75, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90
Tape	В34	TU 3-1091-78

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 from 820 °C to + leave at 530 °C, cooling in water
20-25	-	785	980	10	50	765	-	-
Quenching in oil from 820 °C to + vacation at 580-600 °C, air cooling
≤20	-	830	930	20	66	-	390	-
Quenching in oil from 820 °C to + vacation
-	200	1460	1620	8	50	785	-	52
-	20	1390	1540	8	56	-	-	-
Quenching in oil from 850 °C + vacation at 200 °C, air cooling
≤5	-	1420	1670	13	50	648	-	50
Quenching in oil from 820 °C to + vacation at 580-600 °C, air cooling
20-40	-	810	910	20	65	-	380	-
Quenching in oil from 820 °C to + vacation
-	300	1400	1530	7	50	579	-	50
-	250	-	1460	12	57	-	-	-
Quenching in oil from 850 °C + vacation at 200 °C, air cooling
6-20	-	1370	1670	12	45	481	-	49
Quenching in oil from 820 °C to + vacation at 580-600 °C, air cooling
40-60	-	780	880	20	62	-	370	-
Quenching in oil from 820 °C to + vacation
-	350	1290	1430	8	50	461	-	48
-	20	1270	1320	9	59	-	-	-
Quenching in oil from 820 °C to + vacation at 580-600 °C, air cooling
60-80	-	730	850	20	61	-	360	-
Quenching in oil from 820 °C to + vacation
-	400	1180	1290	10	52	530	-	45
-	250	-	1250	13	65	-	-	-
-	500	920	1070	17	60	1050	-	38
-	400	-	730	17	75	-	-	-
-	600	780	890	21	64	1540	-	33
-	20	1030	1140	12	62	-	-	-
-	250	-	1090	13	67	-	-	-
-	400	-	730	17	76	-	-	-
-	500	-	305	34	82	-	-	-

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	G, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
0	215	84	7850	34	268	-	-
20	215	-	7850	34	268	-	-
100	207	81	7830	35	317	108	494
200	195	76	7800	36	387	115	504
300	187	72	7770	36	469	122	518
400	175	67	7730	36	567	128	536
500	171	65	7700	35	681	132	558
600	-	-	7670	31	817	132	587
700	-	-	7690	28	981	-	657
800	-	-	7650	27	-	135	703
900	-	-	7600	-	-	-	695
1000	-	-	-	-	-	-	695
1200	-	-	-	-	-	-	687

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. Welding methods: SMAW, ESW. Necessary preheating and subsequent heat treatment [50].
Склонность к отпускной хрупкости	inclined
The temperature of forging	Beginning - 1220 °C, the end - of 800 °C. the cross Sections up to 100 mm are cooled in air, 101-300 mm in the pit.
Flock-sensitive sensitivity	sensitive

Steel 30KHN3A

Designation

Description