Steel 25Х2М1Ф (ЭИ723)

Designation

Name	The value
Designation GOST Cyrillic	25Х2М1Ф
Designation GOST Latin	25X2M1F
Transliteration	25H2M1F
By chemical elements	25Cr2Mo1V

Name	The value
Designation GOST Cyrillic	ЭИ723
Designation GOST Latin	EI723
Transliteration	EhI723
By chemical elements	-

Description

25Х2М1Ф steel is used: for the manufacture of special fasteners (fasteners with special properties), operating at temperatures up to +535 °C; flat springs, bolts, pins, nuts, and other parts; fasteners turbines and flange connections, steam pipes and fittings, operating at a steam temperature +500−580 °C (by cold machining and hot forming); fasteners of nuclear power plants.

Note

Steel pearlitic class.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В22	GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Sheets and strips	В33	GOST 4405-75
Bars and shapes	В32	GOST 7417-75, GOST 8559-75, GOST 8560-78, TU 14-1-1397-75, TU 14-1-5037-91, TU 14-1-552-72
Processing of metals by pressure. Forgings	В03	GOST 8479-70, TU 0306.018-80, ST ЦКБА 010-2004

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Mo
TU 14-1-1397-75	0.22-0.29	≤0.025	≤0.03	0.4-0.7	2.1-2.6	0.17-0.37	≤0.3	Rest	≤0.2	0.3-0.5	0.9-1.1
TU 14-1-552-72	0.22-0.29	≤0.025	≤0.03	0.4-0.7	2.1-2.6	0.17-0.37	≤0.25	Rest	≤0.3	0.3-0.5	0.9-1.1

Fe is the basis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Forgings. Normalizing + tempering + vacation
100-300	490	655	13	40	540	212-248
100-300	590	735	13	40	490	235-277
100-300	685	835	12	35	490	262-311
100	685	835	13	42	590	262-311
Normalization at 1030-1060 °C + vacation 680-720 °C, air cooling
≤25	750	900	10	40	300	-
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
-	840	960	15	54	-	-
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 [81]
-	265	275	29	72	-	-
Bars hot rolled and forged (12-180 mm) round and square. Normalization at 1030-1050 °C + a normalization at the 950-970 °C to + leave at 680-720 °C, air cooling
	670	780	12	50	490	-
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
-	610	640	14	59	-	-
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 [81]
-	255	265	35	86	-	-
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
-	810	910	13	54	-	-
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 [81]
-	215	225	34	90	-	-
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
-	580	600	15	60	-	-
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 [81]
-	125	140	40	93	-	-
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
-	720	850	14	58	-	-
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 [81]
-	83	93	60	92	-	-
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
-	530	580	15	66	-	-
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 [81]
-	53	61	61	81	-	-
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
-	570	700	18	66	-	-
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 [81]
-	32	37	55	84	-	-
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
-	450	500	17	69	-	-
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 [81]
-	27	28	58	100	-	-
Bars. Normalization at 1030-1050 °C, air cooling + vacation at 650-660 °C (exposure 6 h), air cooling. At 20 °C NV=285-302
-	780-1050	880-110	11-21	39-70	-	-
-	780-980	880-1010	13-18	38-60	-	-
-	740-910	830-1010	12-14	51-62	-	-
-	680-980	780-1080	12-17	48-60	-	-
-	680-760	760-820	14-19	65-71	-	-
-	640-720	690-770	15-19	70-76	-	-
-	640-710	690-740	17	74	-	-
-	640-710	680-730	16-18	69-76	-	-
-	520-690	550-710	16-22	70-77	-	-

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)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
0	217	82	7800	-	270	-	-
20	223	-	7800	-	270	-	-
100	211	79	7780	33	360	125	538
200	205	72	7750	32	420	129	575
300	200	74	7720	30	500	133	609
400	193	71	7680	29	590	137	634
500	186	66	7650	28	710	14	674
600	174	57	7600	264	840	14	676
700	175	-	-	-	970	-	-
800	-	-	-	-	-	147	735

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	Does not apply to welded structures.
The temperature of forging	Start - 1200 °C, the end - of 800 °C.
Machinability	In the normalized and tempered condition in NV ?Blower SB 300=1030 MPa Kn TV.SPL.=0,25 Kn b.St.=0,60.