Steel 20KH3MVF (ЭИ415)

Designation

Name	The value
Designation GOST Cyrillic	20Х3МВФ
Designation GOST Latin	20X3MBF
Transliteration	20H3MVF
The chemical elements	20Cr3MoWV

Name	The value
Designation GOST Cyrillic	ЭИ415
Designation GOST Latin	EI415
Transliteration	EhI415
The chemical elements	-

Description

20KH3MVF steel is used: for the manufacture of rotors, discs, forgings, bolts, high pressure pipe for chemical apparatus, and hydrogenation plants, special fasteners and other parts operating at temperatures up to +540−560 °C; piping details with quenching in oil and tempering to the air; tubes for plants of chemical and petrochemical plants with nominal pressure PN=19.6−98 MPa (200−1000 kgf/cm²) nitrided parts of the aviation industry; billets of shafts and one-piece rotors stationary and transport steam turbines.

Note

The case hardening steel of pearlitic class.
Temperature intense scaling +600 °C.

Standards

Name	Code	Standards
Sheets and stripes	В23	GOST 103-2006
Sectional and shaped rolling	В22	GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Sheets and stripes	В33	GOST 4405-75, TU 14-1-702-73
Sectional and shaped rolling	В32	GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 20072-74, TU 14-1-2090-77, TU 14-1-3957-85, TU 14-11-245-88
Classification, nomenclature and general norms	В20	OST 1 90005-91
Bulls. Blanks. Slabs	В31	OST 1 90157-74
Bulls. Blanks. Slabs	В21	OST 1 90176-75
Metal forming. Forgings	В03	OST 26-01-135-81, TU 108-1029-81
Thermal and thermochemical treatment of metals	В04	ST ЦКБА 026-2005
Pipes steel and connecting parts to them	В62	TU 14-3Р-251-2007, TU 14-3-251-74

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
TU 108-1029-81	0.17-0.24	≤0.022	≤0.025	0.25-0.6	2.4-3.3	≤0.4	≤0.5	The rest	≤0.25	0.6-0.85	-	0.35-0.55	0.3-0.5
TU 14-3Р-251-2007	0.15-0.23	≤0.025	≤0.03	0.25-0.5	2.8-3.3	0.17-0.37	≤0.3	The rest	≤0.2	0.6-0.85	-	0.35-0.55	0.3-0.5
TU 14-1-2090-77	0.15-0.2	≤0.025	≤0.03	0.25-0.5	2.8-3.3	0.17-0.37	≤0.5	The rest	≤0.3	0.6-0.85	-	0.35-0.55	0.3-0.5
GOST 20072-74	0.15-0.23	≤0.025	≤0.03	0.25-0.5	2.8-3.3	0.17-0.37	≤0.3	The rest	≤0.2	0.6-0.85	≤0.03	0.35-0.55	0.3-0.5

Fe is the basis.
According to GOST 20072-74, when steel is scrap-process, the content of Cu ≤ 0.30%. The presence of titanium is up to 0.030%. When smelting steel by the method of electroslag remelting, the mass fraction of sulfur should not be more than 0.015%.
According to TU 108-1029-81, the chemical composition is given for steel grade 20Х3МВФА (ЭИ415А). In the workpieces, deviations in the content of the elements indicated in the table are allowed: carbon ± 0.010%, silicon + 0.030%. For metal VDP, the deviation of manganese content +0.10% / - 0.15% is allowed. The deviation of the silicon content in the metal VDP and ESR is allowed within ± 0.050%. In the ESR steel, the sulfur content should not be more than 0.015%.
According to TU 14-1-2090-77, the chemical composition is given for steel grade 20X3MVF (EI415). In steel grade 20Х3МВФ-Ш (ЭИ415-Ш) the sulfur content should not be more than 0,015%. If all the requirements of the specification are met, deviations in chemical composition are allowed in accordance with table 2 of GOST 20072. The content of residual elements is allowed: nickel - no more than 0.50% and copper - no more than 0.30%.

Mechanical characteristics

Section, mm	s_T\|s_0,2, MPa	σ_B, MPa	d₅, %	y, %	kJ/m², кДж/м²	Brinell hardness number, MPa	HRC
Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
-	730-810	870-910	13	45-50	-	-	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	-	-	-	321-415	31-43.5
Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
-	700	780	12	55	-	-	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	-	-	-	302-363	28-39
Billet shafts and rotors of steam turbines on the other 108-1029-81 (in the delivery condition specified strength and direction and place the cuttings sample)
-	589-736	≥736	≥13	≥40	≥490	-	-
Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
-	700	780	10	39	-	-	-
Billet shafts and rotors of steam turbines on the other 108-1029-81 (in the delivery condition specified strength and direction and place the cuttings sample)
-	589-736	≥716	≥11	≥32	≥390	-	-
Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
-	660	720	10	33	-	-	-
Blank pieces of pipe fittings. Quenching in oil from 1030-1080 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) + Vacation at 660-700 °C, air cooling
≤25	735-835	≥880	≥12	≥40	≥588	277-321	-
Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
-	580-610	600-630	-	44-52	-	-	-
Blank pieces of pipe fittings. Quenching in oil from 1030-1080 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) + Vacation at 660-700 °C, air cooling
≤400	640-735	≥735	≥13	≥40	≥490	248-293	-
Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
-	510-550	530-560	10-12	44	-	-	-
Quenching in oil with 1030-1060 °C + Vacation at 660-700 °C
-	620-650	730-750	11-13	32-40	392-491	-	-
Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
-	480-500	490-540	11	27-40	-	-	-
Quenching in oil with 1030-1060 °C + Vacation at 660-700 °C
≤25	≥750	≥900	≥12	≥40	≥589	-	-
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥49	≥72	≥56	≥100	-	-	-
Bars hot rolled and forged on the other 14-1-2090-77. The longitudinal samples. Quenching in oil with 1030-1060 °C + Vacation at 660-700 °C (delay of 1-3 h), air cooling
	≥735	≥880	≥12	≥40	≥588	269-341	-
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥31	≥49	≥58	≥100	-	-	-
Bars hot rolled and forged on the other 14-1-2090-77. The longitudinal samples. Quenching in oil with 900-1950 °C + Vacation at 250-350 °C (exposure 2 hours), air cooling
	≥885	≥1080	≥10	≥55	≥686	320-415	-
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥22	≥45	≥66	≥100	-	-	-
Rolled steel. Quenching in oil with 1030-1060 °C + Vacation at 660-700 °C, air cooling
≤90	≥735	≥880	≥12	≥40	≥579	-	-
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥15	≥26	≥77	≥100	-	-	-
Seamless pipes for chemical and petrochemical industries in the state of delivery (indicate the cutting direction of sample)
	≥490	≥784	≥12	-	≥490	241-285	-
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥17	≥27	≥79	≥100	-	-	-
Seamless pipes for chemical and petrochemical industries in the state of delivery (indicate the cutting direction of sample)
	≥490	≥784	≥14	-	≥590	241-285	-
The forging of the rotor 47 so that the barrel diameter is mm. 965-1075 Normalization at 1050 °C + Quenched in oil from 1000 °C + Vacation at 670 °C, cooling with the furnace to 150 °C then in air (samples tangential)
-	590-690	690-780	12-18	41-68	-	-	-
Forming at OST 1 90176-75. Quenching in oil with 1030-1060 °C + Vacation at 660-700 °C (aging for 1 h), air cooling
	≥735	≥883	≥12	≥40	≥588	285-331	-
The forging of the rotor 47 so that the barrel diameter is mm. 965-1075 Normalization at 1050 °C + Quenched in oil from 1000 °C + Vacation at 670 °C, cooling with the furnace to 150 °C then in air (samples tangential)
-	510-600	600-680	11-15	54-61	-	-	-
-	500-590	550-560	13-16	57-65	-	-	-
-	450-570	470-570	15-20	69-72	-	-	-
-	400-510	410-520	12-21	65-80	-	-	-
-	340-450	360-460	18-23	70-84	-	-	-

Description mechanical marks

Name	Description
Section	Section
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_B	Limit short-term strength
d₅	Elongation after rupture
y	The relative narrowing
kJ/m²	Toughness
HRC	Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature	Е, ГПа	r, кг/м3	l, Вт/(м · °С)	R, НОм · м	a, 10-6 1/°С	С, Дж/(кг · °С)
0	207	7800	-	-	-	-
20	207	7800	385	-	-	-
100	204	-	36	398	106	502
200	200	-	33	465	115	560
300	193	-	32	544	118	610
400	186	7690	31	640	121	650
500	182	7660	30	743	126	710
600	117	7620	29	859	126	710
700	171	-	29	982	-	-
800	164	-	-	-	13	750

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. Welding methods: RDS - necessary heating and subsequent heat treatment, the CCC.
Forging temperature	Start - 1240 °C, the end - 780 °C. the cross Sections up to 50 mm are cooled in boxes, 51-700 mm is subjected to annealing, one hypothermia.
Workability by cutting	In the annealed condition with blower SB 157 HB=530 MPa Kn TV.SPL.=1.5 Kn b.St.=1.1

Steel 20KH3MVF (ЭИ415)

Designation

Description

Note

Standards

Chemical composition

Mechanical characteristics

Description mechanical marks

Physical characteristics

A description of the physical symbols

Technological properties

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Steel 20KH3MVF (ЭИ415)

Designation

Description

Note

Standards

Chemical composition

Mechanical characteristics

Description mechanical marks

Physical characteristics

A description of the physical symbols

Technological properties

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