30X steel is used: for the manufacture of hot rolled plates; solid-rolled rings for different purposes, axles, rollers, levers, bolts, nuts and other small parts; fasteners operating at temperatures above +400 °C; details of pipe fittings from rolled steel; forged blanks and forgings (requires heat treatment: quenching in oil and tempering in water or oil).

Note

Structural steel high-quality chrome.

Standards

Name	Code	Standards
Bars and shapes	В32	GOST 1051-73, GOST 4543-71, 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 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008
Sheets and strips	В33	GOST 1577-93, TU 14-1-1409-75, TU 14-1-4118-86, TU 14-1-4118-2004
Sheets and strips	В23	GOST 82-70, GOST 19903-74, GOST 103-2006, GOST 19903-90
Bars and shapes	В22	GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 8319.0-75, GOST 8319.13-75, GOST 9234-74, GOST 11474-76, GOST 8319.4-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90
Thermal and thermochemical treatment of metals	В04	ST ЦКБА 026-2005

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
GOST 4543-71	0.24-0.32	≤0.035	≤0.035	0.5-0.8	0.8-1.1	0.17-0.37	≤0.3	Rest	≤0.3	≤0.05	≤0.03	≤0.15	≤0.2
GOST 10702-78	0.24-0.32	≤0.035	≤0.035	≤0.6	0.8-1.1	≤0.2	≤0.3	Rest	≤0.3	≤0.05	≤0.03	≤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%. In accordance with the order, the content of Si = 0.10-0.37%, Mn = 0.4-0.8% can be established.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₄	y, %	KCU, kJ/m²	HB, MPa
Hot-rolled steel and hot rolled with special surface finish
-	-	-	-	-	-	-	-	≤170
Steel calibrated and calibrated with special surface finish
-	-	-	-	-	-	-	-	≤207
-	-	-	-	-	-	-	-	≤187
-	-	-	-	-	-	-	-	≤187
Quenching in oil from 850-870 °C (exposure for 2.5-4.0 hours depending on the thickness and weight of the workpiece) with the following tempering in water or oil
150	470-530	395	615	15	-	40	539	187-229
Hardening in water from 850 °C + vacation at 550 °C
120	-	520	720	-	21	65	-	-
Quenching in water from 800 °C
-	300	540	900	11	-	53	200	-
A rod with a diameter of 40 mm. Quenching in oil from 860 °C to + leave at 500 °C
-	-	570	790	25	-	65	1270	-
Quenching in oil from 850-870 °C (exposure for 2.5-4.0 hours depending on the thickness and weight of the workpiece) with the following tempering in water or oil
60	470-530	440	635	16	-	45	588	197-235
Hardening in water from 850 °C + vacation at 550 °C
160	-	410	720	-	18	64	-	-
Quenching in water from 800 °C
-	400	560	860	13	-	54	390	-
A rod with a diameter of 40 mm. Quenching in oil from 860 °C to + leave at 500 °C
-	-	510	650	21	-	74	980	-
Quenching in oil with 850-870 °C + vacation at 500-600 °C, air cooling
40	-	670	850	17	-	65	1000	-
Hardening in water from 850 °C + vacation at 550 °C
40	-	510	720	-	22	66	-	-
Quenching in water from 800 °C
-	500	440	690	18	-	70	390	-
A rod with a diameter of 40 mm. Quenching in oil from 860 °C to + leave at 500 °C
-	-	450	500	14	-	75	830	-
Quenching in oil from 860 °C to + leave at 500 °C, cooling in water or oil
100	-	395	615	17	-	45	590	187-229
Hardening in water from 850 °C + vacation at 550 °C
80	-	520	720	-	21	66	-	-
Quenching in water from 800 °C
-	600	490	670	17	-	74	540	-
Quenching in oil from 860 °C to + leave at 500 °C, cooling in water or oil
25	-	690	880	12	-	45	690	-
Hardening in water from 850 °C + vacation at 550 °C
120	-	420	680	-	28	60	-	-
160	-	420	670	-	27	61	-	-
40	-	490	680	-	27	65	-	-
80	-	480	680	-	28	62	-	-

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
d₄	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number

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	208	83	7820	-	210	-	-
20	208	-	7820	-	210	-	-
100	211	-	7800	47	259	124	482
300	197	-	7740	42	417	134	513
500	175	-	7670	36	636	142	555
200	-	-	7770	44	330	13	496
400	-	-	7700	39	517	138	532
600	-	-	7630	32	778	146	583
700	-	-	7590	29	934	148	620
800	-	-	7610	26	1106	12	703
900	-	-	7506	27	1145	-	687
1100	-	-	7470	-	1205	-	670
1200	-	-	7430	-	1230	138	678
1000	-	-	-	-	-	128	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
a	The coefficient of linear expansion

Technological properties

Name	The value
Weldability	welded is limited. RDS, electroslag welding heating and subsequent heat treatment.
Склонность к отпускной хрупкости	inclined
The temperature of forging	Start - 1250 °C, the end - of 800 °C. slow Cooling.
Flock-sensitive sensitivity	sensitive

Steel 30KH

Designation

Description