Steel 08KH22N6T (ЭП53)

Designation

Name	The value
Designation GOST Cyrillic	08Х22Н6Т
Designation GOST Latin	08X22H6T
Transliteration	08H22N6T
By chemical elements	08Cr22Н6Ti

Name	The value
Designation GOST Cyrillic	ЭП53
Designation GOST Latin	EP53
Transliteration	EhP53
By chemical elements	-

Description

08KH22N6T steel is used: for the manufacture of welding machines and vessels, combustion chambers and other structural elements of gas turbines, housings of machines, ends, flanges, parts of internal devices of the apparatus, tube disks and tube bundles operating at temperatures from -10 to +300 °C under pressure and in contact with corrosion environments; for all connections of equipment installed in radioactive environments; as a cladding layer in the manufacture of hot-rolled dual-layer corrosion-resistant sheets.

Note

Austenite corrosion resistant steel-ferritic class.
08KH22N6T steel has higher strength compared to the steels 08KH18N10T and 12KH18N10T and recommended as their substitute.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 19903-74, GOST 19904-90, GOST 103-2006, GOST 19903-90
Processing of metals by pressure. Forgings	В03	GOST 25054-81, OST 5Р.9125-84, ST ЦКБА 010-2004
Bars and shapes	В22	GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Sheets and strips	В33	GOST 4405-75, GOST 5582-75, GOST 7350-77, GOST 10885-85, TU 14-1-394-72, TU 14-1-2676-79
Classification, nomenclature and General rules	В30	GOST 5632-72
Bars and shapes	В32	GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-748-73, TU 14-11-245-88
Steel pipes and fittings to them	В62	GOST 9940-81, GOST 9941-81, GOST 11068-81, TU 14-3-1905-93, TU 14-3-59-71, TU 14-3-1654-89
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-170-72, TU 14-1-565-84
Welding and cutting metals. Soldering, riveting	В05	OST 95 10441-2002
Thermal and thermochemical treatment of metals	В04	STP 26.260.484-2004, ST ЦКБА 016-2005

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Mo	W
TU 14-3-1905-93	≤0.08	≤0.025	≤0.035	≤0.8	21-23	≤0.8	5.3-6.3	Rest	≤0.3	≤0.2	≤0.3	≤0.2
TU 14-1-748-73	≤0.08	≤0.025	≤0.035	≤0.8	21-23	≤0.8	5.3-6.3	Rest	≤0.3	≤0.2	≤0.3	≤0.2

Fe is the basis.
According to GOST 5632-72, TU 14-3-1905-93 and TU 14-1-748-73, the content of Ti% = 5С% - 0,65%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
The billet according to TU 14-1-170-72. Quenching in water from 950-1050 °C. Samples of the longitudinal
	≥343	≥588	≥25	-	-	-
Leaves. Quenching in water from 980-1020 °C
-	370	960	22	51	-	-
Heating to 1100 °C, exposure 30 min (Indicated temperature and time of heat exposure)
-	≥490	≥650	≥41	≥70	-	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in water or air from 950-1050 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h)
≤60	≥343	≥589	≥20	≥45	-	140-200
Heating to 1100 °C, exposure 30 min (Indicated temperature and time of heat exposure)
-	≥520	≥710	≥44	≥73	-	-
Leaves. Quenching in water from 980-1020 °C
-	-	29-49	66-100	82-88	-	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in water or air from 950-1050 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h)
60-100	≥343	≥589	≥19	≥40	≥784	140-200
Heating to 1100 °C, exposure 30 min (Indicated temperature and time of heat exposure)
-	≥540	≥650	≥39	≥74	-	-
Leaves. Quenching in water from 980-1020 °C
-	-	69-78	60-75	65-80	-	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in water or air from 950-1050 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h)
100-300	≥343	≥589	≥17	≥35	≥588	-
Heating to 1100 °C, exposure 30 min (Indicated temperature and time of heat exposure)
-	≥470	≥920	≥21	≥29	-	-
Leaves. Quenching in water from 980-1020 °C
-	-	110-140	62-68	72-75	-	-
Heating to 1100 °C, exposure 30 min (Indicated temperature and time of heat exposure)
-	≥880	≥1040	≥11	≥9	-	-
Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Quenching in water or air from 950-1050 °C
-	-	≥640	≥20	-	-	-
Leaves. Quenching in water from 980-1020 °C
-	-	175-195	40-45	-	-	-
Hot rolled sheet (4,0-50,0 mm) and cold rolled (4,0-5,0 mm) steel according to GOST 7350-77. Quenching in water from 1000-1050 °C
-	≥345	≥590	≥18	-	≥588	-
Leaves. Quenching in water from 980-1020 °C
-	175-215	295-340	35-38	-	-	-
Heating to 1100 °C, exposure 30 min (Indicated temperature and time of heat exposure)
-	≥460	≥620	≥46	≥65	-	-
Forgings for parts resistant to the ICC. Annealing in air or in water from 950-1050 °C
100-300	≥343	≥589	≥17	≥35	-	121-229
Leaves. Quenching in water from 980-1020 °C
-	235-295	410-440	30-35	-	-	-
Forgings for parts resistant to the ICC. Annealing in air or in water from 950-1050 °C
60-100	≥343	≥589	≥19	≥40	-	121-229
Leaves. Quenching in water from 980-1020 °C
-	245-295	490-550	30-35	-	-	-
Forgings for parts resistant to the ICC. Annealing in air or in water from 950-1050 °C
60	≥343	≥589	≥20	≥45	-	121-229
Leaves. Quenching in water from 980-1020 °C
-	295-350	540-590	30-35	-	-	-
Bars hot rolled and forged according to GOST 5949-75. Annealing in air from 950-1050 °C
	≥345	≥590	≥20	≥45	-	-
Leaves. Quenching in water from 980-1020 °C
-	-	20-29	110-118	75-88	-	-
Bars hot rolled and forged at STP 26.260.484-2004. Quenching in water or air with 1020-1050 NN the fire °C
	≥350	≥600	≥20	≥45	≥588	-
Seamless pipes hot and cold-drawn, heat-treated on the other 14-3-1905-93. In the state of delivery (specified outside diameter of pipe)
76-159	≥343	≥588	≥20	-	-	-
Seamless hot deformed tubes in the delivery condition according to GOST 9940-81
	-	≥588	≥24	-	-	-

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	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C
0	203	7700	-	740	-
20	203	7700	-	740	-
100	201	-	15	-	96
200	193	-	16	-	138
300	181	-	18	-	16
400	165	-	20	-	16
500	162	-	21	-	164
600	154	-	23	-	162
700	141	-	24	-	165
800	139	-	27	-	167
900	-	-	30	-	167
1100	-	-	-	-	171

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	Steel is welded without restrictions. Welding ways: ADS and RDS. For manual arc welding it is recommended to use electrodes TSL-11 filler wire SV-08Х19Н10Б. The same wire is used for argon-arc and arc automatic welding. For electric-arc automatic welding is used the flux an-26. Heat treatment after welding is not required. For joints of NPP equipment recommended automatic arc submerged arc welding and manual argon arc welding with non-consumable electrode (filler or without filler material). To improve the overall corrosion resistance of welded assemblies and relieve residual stresses applied on the hardened air from 950-1050 °C (aged for at least 2.5 minutes/mm of maximum wall thickness, but not less than 1 hour).
Склонность к отпускной хрупкости	When heated in the range of 350-750 °C in the ferritic steel component of the processes related to 47
The temperature of forging	Start - 1150 °C, the end - 850 °C.
Machinability	Close to the machinability of steels 12KH18N9T, 12KH18N10T.
Features of heat treatment	Steel products to eliminate the tendency to intergranular corrosion are subjected to hardening regime: heating to 1050±25 °C, exposure during heating for quenching for products with wall thickness up to 10 mm - 30 min, over 10 mm — 20 min + 1 min per 1 mm max thickness cooling in water or air. Products austenite-ferritic steels do not require heat treatment after welding.
The tendency to intergranular corrosion	Satisfactory resistance to intergranular corrosion.