Steel 30G used: for the manufacture of improved parts, which meet the requirements of low strength (rods, axles, cylinders, disks, bolts, nuts, screws and other parts); of billets used for the production of pipes and rolled steel; flat-rolled metal used for the manufacture of car parts.

Note

Structural steel high-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 14955-77, GOST 1050-2013, TU 14-1-2118-77, 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, GOST 2879-2006
Sheets and strips	В33	GOST 1577-93, TU 14-1-522-93, 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, TU 14-1-4992-91
Tape	В34	TU 14-1-1815-76, TU 14-4-156-72

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Mo	Sn
TU 14-1-4944-90	0.29-0.33	≤0.03	≤0.03	1.2-1.4	≤0.2	0.15-0.3	≤0.3	Rest	≤0.25	≤0.05	≤0.06	≤0.02

Fe is the basis.
According to GOST 4543-71 the chemical composition is given for steel 30G. 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 14-1-4944-90 the chemical composition is given for steel 30G1. Permissible deviations in the content of individual elements in accordance with GOST 4543 and GOST 19821.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HRC
The strip in the delivery condition (without heat treatment in the etched condition) on the other 14-1-522-93
-	-	≥315	≥540	≥20	-	-	-
Tape. Hardening in air, 810-820 °C + Vacation at 400 °C, air cooling
≤3	-	-	≥1130	6-7	-	-	37
Rolled steel. Quenching in water 840 °C + Vacation at 550 °C (indicated as the place of cutting out of samples)
120	-	≥540	≥710	≥21	≥63	≥1470	-
A rod with a section of 70 mm. Quenching in oil from 850 °C + Vacation (longitudinal samples)
-	300	≥540	≥780	≥20	≥45	≥390	-
Rolled steel. Normalization at 900 °C, air cooling + Vacation at 680-710 °C (for longitudinal samples)
-	-	≥370	≥710	≥20	≥32	-	-
Rolled steel. Quenching in water 840 °C + Vacation at 550 °C (indicated as the place of cutting out of samples)
160	-	≥530	≥700	≥22	≥63	≥1370	-
A rod with a section of 70 mm. Quenching in oil from 850 °C + Vacation (longitudinal samples)
-	400	≥540	≥760	≥20	≥52	≥290	-
Rolled steel. Normalization at 900 °C, air cooling + Vacation at 680-710 °C (for longitudinal samples)
-	-	≥330	≥630	≥29	≥46	-	-
Rolled steel. Quenching in water from 860 °C to + Vacation at 600 °C, air cooling
25	-	≥315	≥540	≥20	≥45	≥780	-
Rolled steel. Quenching in water 840 °C + Vacation at 550 °C (indicated as the place of cutting out of samples)
40	-	≥590	≥740	≥22	≥65	≥1570	-
A rod with a section of 70 mm. Quenching in oil from 850 °C + Vacation (longitudinal samples)
-	500	≥490	≥700	≥21	≥59	≥490	-
Rolled steel. Normalization at 900 °C, air cooling + Vacation at 680-710 °C (for longitudinal samples)
-	-	≥305	≥590	≥21	≥41	-	-
Rolled steel. Quenching in water 840 °C + Vacation at 550 °C (indicated as the place of cutting out of samples)
80	-	≥560	≥730	≥21	≥64	≥1570	-
A rod with a section of 70 mm. Quenching in oil from 850 °C + Vacation (longitudinal samples)
-	600	≥440	≥640	≥25	≥69	≥1170	-
Rolled steel. Quenching in water 840 °C + Vacation at 550 °C (indicated as the place of cutting out of samples)
120	-	≥490	≥600	≥22	-	≥980	-
160	-	≥490	≥590	≥23	-	≥980	-
200	-	≥450	≥600	≥27	≥63	≥880	-
40	-	≥540	≥710	≥25	-	≥1370	-
80	-	≥490	≥650	≥24	-	≥1080	-

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
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)
20	204	7810	-	-	-
100	-	-	76	126	470
200	-	-	65	139	483
300	-	-	53	146	546
400	-	-	44	15	601
500	-	-	38	155	601
600	-	-	-	156	-
700	-	-	-	156	864
900	-	-	-	148	-

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 steel. Welding methods: SMAW, submerged arc ADS. Recommended heating and subsequent heat treatment. The CCC without restriction.
Склонность к отпускной хрупкости	Inclined at 1.0 % Mn.
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	not sensitive.
Machinability	In a normalized state in HB 149-197 Kn TV.SPL.=Of 1.00 Kn b.St.=0,80.
Microstructure	The size of austenite grains in the steel should be not larger than 5 numbers according to GOST 5639. Depth bezoperatsionnogo layer of steel strip thickness of 3 to 4 mm should be not more than 0.08 mm (3%) with a thickness of more than 4 to 7 mm inclusive not more than 0.16 mm (2%).

Steel 30G (30Г1)

Designation

Description