Alloy KHN78T (ЭИ435)

Designation

Name	The value
Designation GOST Cyrillic	ХН78Т
Designation GOST Latin	XH78T
Transliteration	HN78T
By chemical elements	CrNi78Te

Name	The value
Designation GOST Cyrillic	ЭИ435
Designation GOST Latin	EI435
Transliteration	EhI435
By chemical elements	-

Description

Alloy KHN78T used: for the manufacture of long products and forgings parts, pipes, operating at temperatures up to +1100 °C; aircraft engine parts; performance parts lightly with operating temperatures up to 1000−1100 °C (of flame tubes, combustion chambers, flues, thermocouple sheaths); a welding wire used for welding parts and welding of steel structures in energy engineering; welding electrodes; solid-rolled and welded rings for various purposes.

Note

Alloy, heat-resistant and heat-resistant Nickel-based.
The recommended maximum operating temperature for a long time +1000 °C. the Temperature of intensive scaling in air +1100 °C.
Alloy KHN78T unstable in sulfur-containing environments.

Standards

Name	Code	Standards
Steel pipes and fittings to them	В62	GOST 14162-79, TU 14-3-453-76, TU 14-3-501-76, TU 14-3-552-76, TU 14-3-582-77, TU 14-3-946-80, TU 14-158-135-2003
Sheets and strips	В23	GOST 19904-90
Sheets and strips	В33	GOST 24982-81, TU 14-1-146-71, TU 14-1-1747-76, TU 14-1-2752-79, TU 14-1-4296-87, TU 14-1-4869-90
Processing of metals by pressure. Forgings	В03	GOST 25054-81, OST 1 90110-73, TU 14-1-1530-75, TU 14-1-2902-80
Classification, nomenclature and General rules	В30	GOST 5632-72
Blanks. Of the workpiece. Slabs	В21	OST 1 90176-75
Bars and shapes	В32	OST 1 92049-76, TU 14-1-1671-76, TU 14-1-3957-85, TU 14-11-245-88
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, OST 1 90251-77, OST 1 90343-83, OST 1 90400-91, TU 14-1-1214-75, TU 14-1-895-74
Test methods. Packing. Marking	В09	RD 24.200.15-90
Tape	В34	TU 14-1-1860-76, TU 14-1-975-74
Welding and cutting metals. Soldering, riveting	В05	TU 14-1-997-74, TU 14-1-997-2012
Tubes of non-ferrous metals and alloys	В64	TU 14-3-520-76

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Al	Ti	Mo
TU 14-1-2902-80	≤0.12	≤0.012	≤0.015	≤0.7	19-22	≤0.8	Rest	≤1.5	≤0.3	≤0.15	0.15-0.35	≤0.3
TU 14-1-975-74	≤0.12	≤0.01	≤0.015	≤0.7	19-22	≤0.8	Rest	≤1	≤0.07	≤0.15	0.15-0.35	-
TU 14-1-1671-76	≤0.12	≤0.012	≤0.015	≤0.7	19-22	≤0.8	Rest	≤1.5	≤0.3	≤0.15	0.15-0.35	≤0.3
TU 14-1-4296-87	≤0.12	≤0.01	≤0.015	≤0.7	19-22	≤0.8	Rest	≤1	≤0.3	≤0.15	0.15-0.35	≤0.3
TU 14-3-520-76	≤0.12	≤0.012	≤0.015	≤0.7	19-22	≤0.8	Rest	≤0.6	≤0.2	≤0.15	0.15-0.35	-
GOST 5632-72	≤0.12	≤0.01	≤0.015	≤0.7	19-22	≤0.8	Rest	≤1	≤0.3	≤0.15	0.15-0.35	≤0.3

Ni is the basis.
According to TU 14-1-1747-76 the chemical composition is given for steel grades ХН78Т and ХН78Т-ВД.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₄	d₁₀	y, %	HB, MPa
Ring welded at OST 1 90251-77. Annealing in air from 980-1020 °C (aging of 1.0-1.5 h)
	-	≥638	≥35	-	-	-	-
Sheet. Annealing in air from 980-1020 °C
-	≥270	≥760	≥40	-	-	-	-
Sheet thickness 1,3-1,5 mm. Hardening in air, 1200 °C (indicated by temperature and duration of thermal aging, the samples of transverse/longitudinal)
-	≥180/170	≥475/510	-	-	≥38/34	-	-
Steel cold-rolled sheet (0.8 to 3.9 mm) as supplied (TU 14-1-1747-76)
-	-	≤860	≥35	-	-	-	-
Ring welded at OST 1 90251-77. Annealing in air from 980-1020 °C (aging of 1.0-1.5 h)
	-	≥569	≥18	-	-	-	-
Sheet thickness 1,3-1,5 mm. Hardening in air, 1200 °C (indicated by temperature and duration of thermal aging, the samples of transverse/longitudinal)
-	≥180/170	≥600/550	-	-	≥39/35	-	-
Steel cold-rolled sheet (0.8 to 3.9 mm) as supplied (TU 14-1-1747-76)
-	-	≥180	≥45	-	-	-	-
Sheet. Annealing in air from 980-1020 °C
-	-	≥44	≥112	-	-	-	-
Steel cold-rolled sheet (0.8 to 3.9 mm) and HR (2.0 to 11.0 mm) in the delivery state according to GOST 24982-81. Quenching in water, under a water shower or air 980-1120 °
≤3.9	-	≤860	≥35	-	-	-	-
Sheet thickness 1,3-1,5 mm. Hardening in air, 1200 °C (indicated by temperature and duration of thermal aging, the samples of transverse/longitudinal)
-	≥160/150	≥550/590	-	-	≥37/38	-	-
Cold-rolled steel strip (0,1-2,0 mm) delivery status: Quenching in water or air from 980-1020 °C
-	-	≤830	-	≥25	-	-	-
Sheet. Annealing in air from 980-1020 °C
-	-	≥64	≥100	-	-	-	-
Forgings up to 1000 mm. Hardening in air or in water from 980-1020 °C
	≥196	≥588	≥25	-	-	≥35	≥200
Steel cold-rolled sheet (0.8 to 3.9 mm) and HR (2.0 to 11.0 mm) in the delivery state according to GOST 24982-81. Quenching in water, under a water shower or air 980-1120 °
≤3.9	-	≥175	≥45	-	-	-	-
Sheet thickness 1,3-1,5 mm. Hardening in air, 1200 °C (indicated by temperature and duration of thermal aging, the samples of transverse/longitudinal)
-	≥150/140	≥550/550	-	-	≥31/33	-	-
Sheet. Annealing in air from 980-1020 °C
-	-	≥110	≥90	-	-	-	-
Forgings up to 1000 mm. Hardening in air, 980-1020 °C (delay 2-3 hours), air cooling
	≥165	≥640	≥35	-	-	≥50	-
Steel cold-rolled sheet (0.8 to 3.9 mm) and HR (2.0 to 11.0 mm) in the delivery state according to GOST 24982-81. Quenching in water, under a water shower or air 980-1120 °
4-11	-	≤880	≥30	-	-	-	-
Sheet. Annealing in air from 980-1020 °C
-	≥93	≥180	≥70	-	-	-	-
Sheet thickness 1,3-1,5 mm. Hardening in air, 1200 °C (indicated by temperature and duration of thermal aging, the samples of transverse/longitudinal)
-	≥170/170	≥520/600	-	-	≥40/38	-	-
Rolled steel. Quenching in water, under a water shower or air from 980-1020 °C
30	≥300	≥700	≥30	-	-	≥50	-
Steel cold-rolled sheet (0.8 to 3.9 mm) and HR (2.0 to 11.0 mm) in the delivery state according to GOST 24982-81. Quenching in water, under a water shower or air 980-1120 °
4-11	-	≥175	≥40	-	-	-	-
Sheet. Annealing in air from 980-1020 °C
-	≥185	≥390	≥35	-	-	-	-
Rolled steel. Annealing in air from 980-1020 °C (delay 2-3 hours)
60	≥196	≥650	≥35	-	-	≥50	-
Sheet. Annealing in air from 980-1020 °C
-	≥205	≥590	≥40	-	-	-	-
Thin-walled seamless tubes according to TU 14-3-520-76 on delivery
	≥255	≥588	≥35	-	-	-	-
Sheet. Annealing in air from 980-1020 °C
-	≥245	≥610	≥40	-	-	-	-
Cold-rolled tubes after austenization on delivery
	-	≥640	≥30	-	-	-	-
Sheet. Annealing in air from 980-1020 °C
-	≥245	≥670	≥40	-	-	-	-
-	-	≥24	≥130	-	-	-	-
Sample Diametro 10 mm, length 50 mm, laminated and tempered. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
-	≥315	≥380	≥72	-	-	≥47	-
-	≥195	≥215	≥45	-	-	≥84	-
-	≥100	≥110	≥64	-	-	≥93	-
-	≥76	≥88	≥70	-	-	≥97	-
-	≥42	≥54	≥92	-	-	≥100	-

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
d₄	Elongation after rupture
d₁₀	Elongation after rupture
y	The relative narrowing
HB	Brinell hardness number

Physical characteristics

Temperature	Е, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C
0	224	8400	14	1090	-
20	224	8400	-	1090	-
100	219	8380	15	1099	118
200	213	8340	17	1108	128
300	206	8310	19	1117	128
400	200	8260	20	1127	144
500	193	8220	21	1153	148
600	184	8180	23	1135	158
700	-	8130	24	1126	154
800	-	8090	25	1123	161
900	-	8040	-	-	-
1000	-	-	-	-	165

A description of the physical symbols

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

Technological properties

Name	The value
Weldability	Difficult weldability. Method of welding - SMAW electrodes CT-22.
The temperature of forging	Beginning - 1220 °C, the end - 850 °C. the cross Sections up to 300 mm are cooled in stacks on the air.
Machinability	In heat treated condition when blower SB 156 and HB=710 MPa Kn TV.SPL.=A 0.5 Kn b.St.=0,3.