Steel 15G used: for the manufacture after the improvement of the rivets for critical applications; after cementation, or cyanidation — piston pins, friction discs, finger springs, Cam rollers, bolts, nuts, screws, gears, worms, and other parts with high hardness and wear resistance of the surface; without the heat treatment as welded sub frames, shoes, scarves, fittings, bushings.

Note

Steel structural quality manganese.

Standards

Name	Code	Standards
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, GOST 1050-2013, TU 14-1-2118-77, TU 14-1-2247-77, TU 14-1-3938-85, TU 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008
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
Sheets and strips	В33	GOST 1577-93, TU 14-1-3769-84, TU 14-1-4276-87
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	0.12-0.19	≤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, %	d₁₀	y, %	HB, MPa
Normalizing at 880 °C, air cooling
≤25	-	245	410	26	-	55	-
Quenching in water from 890 °C to + vacation at 425 °C, cooling in oil
19	-	870	940	-	6	67	-
Billets with a diameter of 23 mm. Normalization 900 °C. Quenching in water from 890 °C to + vacation, cooling in oil.
-	400	930	980	-	5	65	-
Steel calibrated and calibrated with special surface finish, hot rolled and hot rolled with special surface finish
-	-	-	-	-	-	-	≤163
Quenching in water from 890 °C to + vacation at 425 °C, cooling in oil
60	-	435	560	-	17	78	-
Billets with a diameter of 23 mm. Normalization 900 °C. Quenching in water from 890 °C to + vacation, cooling in oil.
-	450	780	870	-	8	70	-
Quenching in water from 890 °C to + vacation at 450 °C, cooling in oil
19	-	790	870	-	8	67	-
Billets with a diameter of 23 mm. Normalization 900 °C. Quenching in water from 890 °C to + vacation, cooling in oil.
-	550	640	700	-	12	78	-
Quenching in water from 890 °C to + vacation at 450 °C, cooling in oil
60	-	415	560	-	17	72	-

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
d₁₀	Elongation after rupture
y	The relative narrowing
HB	Brinell hardness number

Physical characteristics

Temperature	r, kg/m³	a, 10^-6 1/°C	С, J/(kg · °C)
0	7810	-	-
300	-	123	538
600	-	149	538

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	weldability is good.
Склонность к отпускной хрупкости	tend not
The temperature of forging	Start - 1200 °C, the end - 825 °C. air Cooling.
Flock-sensitive sensitivity	not sensitive

Steel 15G (15Г1)

Designation

Description