Steel 40Х10С2М

40Cr10Cr2M Steel

Steel 40Kh10S2M: Handbook of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperatures, physical, mechanical, technological and foundry properties for the brand — Steel 40X10C2M.

General information on steel 40Kh10S2M

Delivery type

Bar stock, including shaped: GOST 5949−75, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 18907−73. Calibrated rod GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silver GOST 14955−77, GOST 18907−73. Strip GOST 4405−75, GOST 103−75. Forged and forged blanks GOST 1133−71.

Application

Valves of aircraft engines, automotive and tractor diesel engines, engine mounting parts. Steel is heat-resistant and heat-resistant martensitic class has high mechanical properties up to 600 ° C, but at a long exposure at 500 ° C and especially at 600 ° C, impact toughness drops sharply to 150 kJ/m2.

Chemical composition of steel 40X10C2M

Chemical element	%
Silicon (Si)	1.9−2.6
Manganese (Mn), not more	0.8
Copper (Cu), not more than	0.30
Molybdenum (Mo)	0.7−0.9
Nickel (Ni), not more than	0.6
Sulfur (S), max.	0.025
Titanium (Ti), not more than	0.2
Carbon (C)	0.35−0.45
Phosphorus (P), not more than	0.030
Chrome (Cr)	9.0−10.5

Mechanical properties of steel 40Х10С2М

Mechanical properties at elevated temperatures

t test,°C	σ0_{, 2}, MPa	_σB, MPa	_δ5, %	ψ, %	KCU, ^J/m2
Hardening at 1100 °C, oil. Tempering at 800 °C, water.
20	670	940	19	41	29
100	570	840	14	26
200	510	820	18	39	69
300	520	830	15	36	81
400	480	760	13	24	85
500	455	660	21	41	87
600	370	430	30	71	113
700	200	220	41	92
Hardening 1010−1050 °C, oil. Tempering at 750 °C, oil (short-term tests)
20		930	10	35
600		390	18	85
700		160	27	96
800		59	30	98
900		34	48	98

Mechanical properties depending on tempering temperature

t tempering temperature, °C	_σB, MPa	_δ5, %	ψ, %	KCU, ^J/m2	HB
Hardening 950−1050°C.
200	1780	3	8	39	555
300		12	20		540
400					570
500					545
600	1400	22	68		400
700	850	50		58	250

Mechanical properties of the bar

Heat treatment, delivery condition	Section, mm	σ0_{, 2}, MPa	_σB, MPa	_δ5, %	ψ, %	KCU, ^J/m2
Rods. Tempering at 1010−1050°C, air or oil. Tempering 720−780°C, oil.	60	735	930	10	35	20

Mechanical properties depending on heat treatment

Heat treatment, delivery condition	σ0_.2, MPa	_σB, MPa	_δ5, %	ψ, %	KCU, ^J/m2
Heat soaking at 500 °C, 1000 h	670	930	16	33	17
Tempering at 1100 °C, oil. Heat soak 500 °C, 3000 h.	660	900	17	42	29
Tempering 800 °C, 3 h, water. Heat soaking 500 °C, 5000 h.	670	910	14	25	16

Technological properties of 40Х10С2М steel

Forging temperature

Beginning temperature 1200, ending temperature 850. Sections up to 350 mm are cooled in the pits.

Weldability

Difficult-to-weld. Welding method RDS, heating and subsequent heat treatment is necessary.

Tendency to temper.

is not prone to

Flocculation sensitivity

is not sensitive