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. |
