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Steel 08KH21N6M2T (ЭП54)

Designation

Name The value
Designation GOST Cyrillic 08Х21Н6М2Т
Designation GOST Latin 08X21H6M2T
Transliteration 08H21N6M2T
The chemical elements 08Cr21Н6Mo2Ti
Name The value
Designation GOST Cyrillic ЭП54
Designation GOST Latin EP54
Transliteration EhP54
The 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
Pipes steel and connecting parts to them В62 GOST 11068-81, TU 14-3-1905-93, TU 14-3-59-71, TU 14-3-59-72
Metal forming. Forgings В03 GOST 25054-81, ST ЦКБА 010-2004
Sheets and stripes В33 GOST 5582-75, GOST 7350-77, TU 14-1-394-72, TU 14-1-2676-79
Classification, nomenclature and general norms В30 GOST 5632-72
Sectional and shaped rolling В32 GOST 5949-75, TU 14-11-245-88
Bulls. Blanks. Slabs В31 OST 3-1686-90, TU 14-1-170-72
Welding and cutting of 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 The 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 The rest ≤0.3 ≤0.2 0.2-0.4 1.8-2.5 ≤0.2
Fe is the basis.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, % kJ/m2, кДж/м2 Brinell hardness number, 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
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
kJ/m2 Toughness

Physical characteristics

Temperature Е, ГПа r, кг/м3 l, Вт/(м · °С) R, НОм · м a, 10-6 1/°С
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.
Propensity to intergranular corrosion Satisfactory resistance to intergranular corrosion.

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