Steel 20G 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, gears, worms, and other parts with high hardness and wear resistance of the surface; without the heat treatment as welded sub frames, shoes, scarves; cold-drawn tubes for the manufacture of bushings of the track link and piston pins for engines of tractors; the bars used for the manufacture of car parts.

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 14-11-245-88, TU 14-1-1271-75, TU 14-1-5228-93, 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, TU 14-2-341-78
Sheets and strips	В33	GOST 1577-93, TU 14-1-522-93, TU 14-1-1832-76, TU 14-1-522-73
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
Steel pipes and fittings to them	В62	TU 14-3-316-74, TU 14-3-575-90

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
GOST 4543-71	0.17-0.24	≤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, %	d	d₁₀	y, %	HB, MPa	HRC
Hot-rolled steel and hot rolled with special surface finish
-	-	-	-	-	-	-	-	≤179	-
Steel calibrated and calibrated with special surface finish
-	-	-	-	-	-	-	-	≤187	-
The strip in the delivery condition (without heat treatment in the etched condition) on the other 14-1-522-93
-	-	≥275	≥450	≥24	-	-	-	-	-
Normalizing at 880°C, air.
≤25	-	≥275	≥450	≥24	-	-	≥50	-	-
Quenching in water from 890 °C to + leave 450 °C, oil
20	-	≥390	≥450	-	≥8	-	≥67	-	-
Quenching in water from 890 °C to + vacation 400-600 °C, oil
-	400	≥920	≥980	-	-	≥6	≥67	-	-
Normalization at 900 °C, air + vacation at 610 °C, air cooling
≤650	-	≥235	≥430	≥24	-	-	-	126-163	-
Quenching in water from 890 °C to + leave 450 °C, oil
40	-	≥300	≥360	-	≥12	-	≥74	-	-
Quenching in water from 890 °C to + vacation 400-600 °C, oil
-	500	≥700	≥780	-	-	≥12	≥74	-	-
Quenching in water from 890 °C to + leave 450 °C, oil
60	-	≥210	≥270	-	≥16	-	≥78	-	-
Quenching in water from 890 °C to + vacation 400-600 °C, oil
-	600	≥540	≥640	-	-	≥15	≥79	-	-
Cementation at 900-920 °C, air cooling + tempering in oil 780-800 °C + vacation 180-200 °C, air
≤25	-	325-370	540-590	≥16	-	-	≥40	146-163	57-63

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
d	Elongation after rupture
d₁₀	Elongation after rupture
y	The relative narrowing
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	204	7820	-	-	-
100	-	-	78	125	-
200	-	-	67	134	525
400	-	-	-	144	525
800	-	-	-	152	689

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
С	Specific heat

Technological properties

Name	The value
Weldability	welded without restriction (except chemical-thermally treated parts). Welding methods: SMAW, Ads submerged arc and gas protection, the CCC without restriction.
Склонность к отпускной хрупкости	tend not
The temperature of forging	Start - 1260 °C, the end - 750 °C. the cross-Section up to 600 mm, with the recrystallization annealing (or normalizing), one hypothermia.
Flock-sensitive sensitivity	not sensitive
Machinability	In a normalized state in HB 143-187 Kn TV.SPL.=1.00 Kn b.St.=0.95
Microstructure	The size of austenite grains in the steel should be not larger than 5 numbers according to GOST 5639.

Steel 20G (20Г1)

Designation

Description