Steel 40G used: for the manufacture of axles, crankshafts, gears, rods, tires, parts, valves, connecting rods, sprockets and distribution of cylinders, heads, pistons and other parts, which are requirements of high strength.

Note

Structural steel high-quality manganese.

Standards

Name	Code	Standards
Bars and shapes	В22	GOST 1133-71, GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 8319.0-75, GOST 9234-74, GOST 11474-76, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Sheets and strips	В33	GOST 1577-93
Bars and shapes	В32	GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, GOST 1050-2013, 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	В23	GOST 82-70, GOST 19903-74, GOST 103-2006, GOST 19903-90
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
GOST 4543-71	0.37-0.45	≤0.035	≤0.035	0.7-1	≤0.3	0.17-0.37	≤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%.

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 water with 830-850 °C + vacation at 180-200 °C, air cooling
≤25	-	-	-	-	-	-	-	43-49
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
100	-	540	810	19	53	-	-	-
A rod with a diameter of 35 mm. Quenching in water from 800 °C [24]
-	300	860	1120	10	30	-	-	-
Steel calibrated and calibrated with special surface finish, hot rolled and hot rolled with special surface finish
-	-	-	-	-	-	-	≤207	-
Quenching in water from 860° C to + vacation at 600 °C, air cooling
≤25	-	350	590	17	45	590	-	-
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
200	-	530	790	15	52	-	-	-
A rod with a diameter of 35 mm. Quenching in water from 800 °C [24]
-	400	780	1010	10	43	-	-	-
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
50	-	590	820	20	51	-	-	-
A rod with a diameter of 35 mm. Quenching in water from 800 °C [24]
-	500	680	880	15	54	-	-	-
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
100	-	490	790	22	50	-	-	-
A rod with a diameter of 35 mm. Quenching in water from 800 °C [24]
-	600	530	740	20	63	-	-	-
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
200	-	480	760	24	50	-	-	-
A rod with a diameter of 35 mm. Quenching in water from 800 °C [24]
-	700	430	630	35	70	-	-	-
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
50	-	570	820	20	49	-	-	-
A rod with a diameter of 35 mm. Quenching in oil from 850 °C [140]
-	300	570	760	14	50	-	-	-
-	400	550	760	16	51	-	-	-
-	500	510	720	18	51	-	-	-
-	600	440	680	22	55	-	-	-
-	700	320	580	30	66	-	-	-
A rod with a section of 70 mm. Quenching in water from 800 °C
-	300	580	880	14	46	-	-	-
-	400	570	850	15	47	-	-	-
-	500	540	790	19	55	-	-	-
-	600	500	730	23	60	-	-	-
-	700	430	620	27	70	-	-	-
A rod with a section of 70 mm. Quenching in oil from 850 °C
-	300	570	840	15	48	-	-	-
-	400	550	800	17	49	-	-	-
-	500	510	780	18	50	-	-	-
-	600	440	680	24	55	-	-	-
-	700	390	590	30	66	-	-	-

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)	a, 10^-6 1/°C	С, J/(kg · °C)
0	200	7810	-	-	-
20	200	7810	-	-	-
100	-	-	60	111	487
200	-	-	53	117	487
400	-	-	47	-	483
500	-	-	24	127	-
300	-	-	-	117	-
700	-	-	-	143	-
600	-	-	-	-	491
800	-	-	-	-	575

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, submerged arc ADS. Recommended heating and subsequent heat treatment. The CCC without restriction.
Склонность к отпускной хрупкости	inclined
The temperature of forging	Start - 1250 °C, end - 800 °C. of the Workpiece cross-section up to 400 mm are cooled in air.
Flock-sensitive sensitivity	insensitive
Machinability	In a normalized state in HB 174-207 Kn TV.SPL.=0.95 Kn b.St.=0.70

Steel 40G

Designation

Description