30KHGT steel is used: for the manufacture of improved and cemented parts which require high strength and toughness of core and high surface hardness and operating at high speeds and high unit pressures under the action of shock loads.

Note

Structural steel quality chromatorgraphy.

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 14955-77, TU 14-1-5414-2001, TU 14-1-2118-77, TU 14-1-707-73, TU 14-1-3238-81, TU 14-11-245-88, TU 14-1-5228-93, 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, OST 5Р.9125-84, ST ЦКБА 010-2004
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
TU 14-1-3238-81	0.24-0.32	≤0.03	≤0.03	0.8-1.1	1-1.3	0.17-0.37	≤0.3	Rest	≤0.3	≤0.05	0.03-0.099	≤0.15	≤0.2
GOST 4543-71	0.24-0.32	≤0.035	≤0.035	0.8-1.1	1-1.3	0.17-0.37	≤0.3	Rest	≤0.3	≤0.05	0.03-0.09	≤0.15	≤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%.
According to TU 14-1-3238-81 the chemical composition for steel grade 30ХГТА is given.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Normalization at 880-950 °C + Quenching in oil from 850 °C + Vacation at 200 °C, cooling in water or oil
Образец для м/и	-	≥1270	≥1470	≥9	≥40	≥579	-	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
15-20	-	≥930	≥1180	≥14	≥50	-	-	≥38
Rolled steel. Quenching in oil from 850 °C + Vacation (longitudinal samples)
-	200	≥1420	≥1680	≥10	≥53	-	-	≥50
Forgings. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
100	-	≥685	≥835	≥13	≥42	≥579	262-311	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
20-25	-	≥830	≥1130	≥17	≥45	-	-	≥34
Rolled steel. Quenching in oil from 850 °C + Vacation (longitudinal samples)
-	300	≥1270	≥1520	≥9	≥52	-	-	≥48
Forgings. Cementation at 920-950 °C, air cooling + Tempering in oil 840-860 °C + Vacation at 180-200 °C, air cooling
100-150	-	≥690	≥830	≥12	≥30	≥481	≥240	57-63
Rolled steel. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
5-15	-	≥1180	≥1420	≥13	≥50	-	-	≥45
Rolled steel. Quenching in oil from 850 °C + Vacation (longitudinal samples)
-	400	≥1180	≥1370	≥8	≥55	-	-	≥44
Forgings. Cementation at 920-950 °C, air cooling + Tempering in oil 840-860 °C + Vacation at 180-200 °C, air cooling
60-100	-	≥730	≥880	≥12	≥35	≥579	≥270	57-63
Rolled steel. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
5	-	≥1420	≥1620	≥12	≥50	-	-	-
Rolled steel. Quenching in oil from 850 °C + Vacation (longitudinal samples)
-	500	≥980	≥1080	≥11	≥59	-	-	≥38
Forgings. Cementation at 920-950 °C, air cooling + Tempering in oil 840-860 °C + Vacation at 180-200 °C, air cooling
60	-	≥780	≥1080	≥12	≥35	≥579	≥300	57-63
Rolled steel. Quenching in oil from 850 °C + Vacation (longitudinal samples)
-	600	≥760	≥930	≥19	≥65	-	-	≥32

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	l, W/(m · °C)	a, 10^-6 1/°C	С, J/(kg · °C)
20	212	83	36	-	-
100	202	79	37	105	495
200	195	76	36	12	508
300	189	74	34	127	525
400	174	67	33	133	537
500	169	66	31	138	567
600	157	61	29	138	588
700	138	53	28	-	626
800	132	51	28	14	626
1000	-	-	-	-	705

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, CCC. Recommended heating and subsequent heat treatment.
Склонность к отпускной хрупкости	inclined
The temperature of forging	Beginning - 1220 °C, the end - of 800 °C. the cross Sections up to 200 mm are cooled in the ash of more than 200 mm in the furnace.
Flock-sensitive sensitivity	not sensitive.
Machinability	After normalization with HB 364 and blower SB=860 MPa Kn TV.SPL.=0,45 Kn b.St.=0,25.

Steel 30KHGT

Designation

Description