Steel 08KH21N6M2T (ЭП54)

Designation

Name	The value
Designation GOST Cyrillic	08Х21Н6М2Т
Designation GOST Latin	08X21H6M2T
Transliteration	08H21N6M2T
By chemical elements	08Cr21Н6Mo2Ti

Name	The value
Designation GOST Cyrillic	ЭП54
Designation GOST Latin	EP54
Transliteration	EhP54
By chemical elements	-

Description

Steel 08KH21N6M2T applied: fabrication of equipment for chemical industry, organic synthesis and production of sulfuric acid; equipment for pulp and paper industry (production of caprolactam, urea; distillation columns; extraction, Packed and purge tanks; and storage tanks, collectors, heat exchangers, reactors; piping and valves, continuously operating at temperatures up to +350 °C; parts and welded structures operating in environments of increased aggressiveness: acetate, sulfate, phosphate environments; for repair of welded joints of equipment working in radioactive environments and for repair of equipment in the limited time of staff.

Note

Steel corrosion-resistant heat-resistant and heat-resistant austenite-ferritic class.
08KH21N6M2T steel has higher strength and is recommended as a substitute for steel 10X17H13M2T.

Standards

Name	Code	Standards
Steel pipes and fittings to them	В62	GOST 11068-81, TU 14-3-1905-93, TU 14-3-59-71, TU 14-3-59-72
Processing of metals by pressure. Forgings	В03	GOST 25054-81, ST ЦКБА 010-2004
Sheets and strips	В33	GOST 5582-75, GOST 7350-77, 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, TU 14-11-245-88
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-170-72
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	Ti	Mo	W
TU 14-3-1905-93	≤0.08	≤0.025	≤0.035	≤0.8	20-22	≤0.8	5.5-6.5	Rest	≤0.3	≤0.2	0.2-0.4	1.8-2.5	≤0.2
GOST 5632-72	≤0.08	≤0.025	≤0.035	≤0.8	20-22	≤0.8	5.5-6.5	Rest	≤0.3	≤0.2	0.2-0.4	1.8-2.5	≤0.2

Fe is the basis.

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	-	-	-
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	≥345	≥590	≥25	≥45	≥785	140-200
60-200	≥343	≥539	≥22	≥40	≥785	140-200
200-500	≥343	≥539	≥18	≥37	≥588	140-200
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 1000-1080 °C
-	-	≥590	≥22	-	-	-
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 with 1025-1075 °C
-	≥345	≥590	≥20	-	≥588	140-200
Forgings. Quenching in water from 1050 °C
	≥343	≥539	≥18	≥35	≥588	-
Bars hot rolled and forged according to GOST 5949-75. Annealing in air from 950-1050 °C
	≥345	≥590	≥25	≥45	-	-
Bars hot rolled and forged at STP 26.260.484-2004. Annealing in air 1020-1050 NN the fire °C
	≥350	≥600	≥25	≥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	-	-	-

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
20	193	7700	-	700	-
100	185	-	146	-	95
200	178	-	159	-	138
300	169	-	175	-	16
400	164	-	192	-	16
500	162	-	205	-	163
600	153	-	217	-	167
700	139	-	217	-	171
800	136	-	243	-	171
900	-	-	255	-	174

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. To repair joints of NPP equipment recommended by the manual argon arc welding with non-consumable electrode (filler or without filler material), allowed the use of manual arc welding with coated electrodes. For repair of equipment in the limited time of stay of the personnel used manual arc welding with covered electrodes and combined welding methods. 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).
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.