45G2 steel is used: for the manufacture of shaft-gear, crankshaft and propeller shafts, axle shafts, worms, covers, connecting rods, connecting rods, links, conveyor chains and other large sredneshirotnykh details.

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, TU 14-1-1659-76, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008
Bars and shapes	В22	GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
GOST 4543-71	0.41-0.49	≤0.035	≤0.035	1.4-1.8	≤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%. In accordance with the order, the content of Mn = 1,2-1,6% can be established.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	HB, MPa
Quenching in oil from 850°C + vacation at 650°C, air cooling
≤25	-	400	680	11	40	-
Rod with cross section of 25 mm. Quenching in oil from 810 °C to + leave + hladanie in oil [119]
-	375	-	1390	7	42	418
A sample with a diameter of 10 mm and a length of 50 mm, laminated and annealed
-	-	97	115	35	98	-
Rod with cross section of 25 mm. Quenching in oil from 810 °C to + leave + hladanie in oil [119]
-	450	-	1200	8	42	340
Normalization at 810 °C, air cooling
-	-	480	800	18	51	241
A sample with a diameter of 10 mm and a length of 50 mm, laminated and annealed
-	-	55	74	54	98	-
Annealing: heat to 780 °C with a speed of 350 deg/h, shutter speed, cooling with the furnace at a speed of 40 deg/h
≤25	-	350	670	21	44	187
Rod with cross section of 25 mm. Quenching in oil from 810 °C to + leave + hladanie in oil [119]
-	525	-	1040	13	47	302
A sample with a diameter of 10 mm and a length of 50 mm, laminated and annealed
-	-	35	49	59	100	-
Rod with cross section of 25 mm. Quenching in oil from 810 °C to + leave + hladanie in oil [119]
-	600	810	920	15	54	269
A sample with a diameter of 10 mm and a length of 50 mm, laminated and annealed
-	-	27	35	63	100	-
A rod with a diameter of 35 mm. Quenching in oil from 850 °C + vacation [140]
-	300	1290	1520	5	10	-
A sample with a diameter of 10 mm and a length of 50 mm, laminated and annealed
-	-	17	26	73	100	-
A rod with a diameter of 35 mm. Quenching in oil from 850 °C + vacation [140]
-	400	1080	1270	6	16	-
-	500	730	1030	11	39	-
-	600	670	860	18	52	-
A rod with a section of 70 mm. Quenching in water from 820 °C to + leave [140]
-	300	1180	1500	6	16	-
-	400	900	1180	9	34	-
-	500	740	970	13	49	-
-	600	640	810	11	60	-
A rod with a section of 70 mm. Quenching in oil from 850 °C + vacation [140]
-	300	610	1010	17	47	-
-	400	640	980	17	47	-
-	500	630	920	18	50	-
-	600	540	820	20	55	-

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
HB	Brinell hardness number

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C	С, J/(kg · °C)
0	204	83	7810	-	-	-
20	204	-	7810	-	-	-
200	-	-	-	45	119	445
300	-	-	-	43	119	445
400	-	-	-	41	-	-
500	-	-	-	35	127	428
100	-	-	-	-	113	-
700	-	-	-	-	147	-

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	RDS - necessary heating and subsequent heat treatment. KTS - requires subsequent heat treatment.
Склонность к отпускной хрупкости	inclined
The temperature of forging	Start - 1200 °C, the end - of 750-800 °C. the cross Sections up to 100 mm are cooled in air, section 101-300 mm - mulde.
Flock-sensitive sensitivity	insensitive
Machinability	After normalization with HB 229 Kn TV.SPL.=0.80 Kn b.St.=0.55

Steel 45G2

Designation

Description