34ХН3М steel is used: for the manufacture of forgings of various parts of General engineering; major critical components with high requirements to mechanical properties.

Note

The steel alloy of high quality.

Standards

Name	Code	Standards
Processing of metals by pressure. Forgings	В03	GOST 8479-70, TU 0306.018-80, TU 108.11.917-87, ST ЦКБА 010-2004

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Mo
TU 108.11.917-87	0.3-0.4	≤0.035	≤0.03	0.5-0.8	0.7-1.1	0.17-0.37	2.75-3.25	Rest	≤0.3	0.25-0.4

Fe is the basis.
According to TU 108.11.917-87, after processing the steel on the OSRV, a limitation on the sulfur content ≤ 0.015% and phosphorus ≤ 0.015% is introduced. The total content of sulfur and phosphorus after OSRV ≤ 0.020%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Forgings. Hardening + Vacation
300-500	≥640	≥785	≥11	≥33	≥440	248-293
500-800	≥640	≥785	≥10	≥30	≥390	248-293
500-800	≥685	≥835	≥10	≥30	≥390	262-311
300-500	≥735	≥880	≥11	≥30	≥390	277-321
500-800	≥735	≥880	≥1	≥30	≥370	277-321
Forgings. Normalization
100-300	≥640	≥785	≥12	≥38	≥490	248-293
100-300	≥685	≥835	≥12	≥38	≥490	262-311
300-500	≥685	≥835	≥11	≥33	≥390	262-311
100	≥685	≥835	≥13	≥42	≥590	262-311
100-300	≥735	≥880	≥12	≥35	≥490	277-321
100	≥735	≥880	≥13	≥40	≥590	277-321
A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥87	≥145	≥62	≥98	-	-
-	≥51	≥91	≥67	≥98	-	-
-	≥36	≥66	≥72	≥100	-	-
Rod. Quenching in oil with 850-870 °C + Vacation 690 °C (maintained for 5 h) + Quenching in oil with 850-870 °C + Vacation 630-650 °C, (extract 1.5-2 h), air cooling
-	≥860	≥960	≥19	≥49	-	-
-	≥760	≥900	≥16	≥60	-	-
-	≥720	≥910	≥17	≥56	-	-
-	≥700	≥860	≥21	≥70	-	-
-	≥540	≥610	≥18	≥75	-	-
-	≥460	≥480	≥25	≥89	-	-
-	≥160	≥180	≥47	≥96	-	-
Rod. Quenching in oil with 850-870 °C + Vacation at 690 °C (maintained for 5 h), air cooling
-	≥530	≥850	≥17	≥49	-	-
-	≥500	≥720	≥22	≥68	-	-
-	≥470	≥600	≥24	≥76	-	-
-	≥320	≥350	≥32	≥91	-	-

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
HB	Brinell hardness number

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C
0	207	79	7830	-	-
20	207	-	7830	-	-
100	203	79	7810	36	108
200	198	-	7780	37	116
300	192	-	-	37	125
400	182	69	7710	37	133
500	173	59	-	35	135
600	-	-	7650	31	135
900	-	-	-	27	-
800	-	-	-	-	137

A description of the physical symbols

Name	Description
Е	The normal elasticity modulus
r	Density
l	Coefficient of thermal conductivity
R	UD. the resistivity

Technological properties

Name	The value
Weldability	Limited weldability. Method of welding: SMAW, ESW. Necessary preheating and subsequent heat treatment.
Склонность к отпускной хрупкости	Malosolone.
The temperature of forging	Start - 1240 °C, the end - 780 °C. the cross Sections up to 100 mm are cooled in air, 101-350 mm - in the pit.
Flock-sensitive sensitivity	Excessively sensitive.
Machinability	In the annealed condition at 210-230 HB blower SB=640 MPa Kn TV.SPL.=0,8.

Steel 34ХН3М

Designation

Description