Steel 20KH25N20S2 (ЭИ283)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
20Х25Н20С2 |
| Designation GOST Latin |
20X25H20C2 |
| Transliteration |
20H25N20S2 |
| The chemical elements |
20Cr25Н20С2 |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ283 |
| Designation GOST Latin |
EI283 |
| Transliteration |
EhI283 |
| The chemical elements |
- |
Description
20KH25N20S2 steel is used: for manufacturing parts of furnaces, operating at temperatures up to +1100 °C in air and hydrocarbon atmospheres; hangers and supports in boilers; pipe electrolysis and pyrolysis plants.
Note
Steel heat-resistant austenitic class.
The recommended maximum operating temperature for a long time +1050 °C. the Temperature of intensive scaling in air +1100 °C.
In the temperature range 600−800 °C is prone to embrittlement due to the formation of σ-phase.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Sheets and stripes |
В23 |
GOST 19903-74, GOST 19904-90, GOST 103-2006, GOST 19903-90 |
| Sheets and stripes |
В33 |
GOST 4405-75, GOST 5582-75, TU 14-1-2186-77 |
| Classification, nomenclature and general norms |
В30 |
GOST 5632-72 |
| Sectional and shaped rolling |
В32 |
GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-11-245-88 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90, TU 14-1-1213-75 |
| Metal forming. Forgings |
В03 |
STP М386-79 |
| Steel alloy wire |
В73 |
TU 14-1-5361-98 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 5632-72 |
≤0.2 |
≤0.02 |
≤0.035 |
≤1.5 |
24-27 |
2-3 |
18-21 |
The rest |
≤0.3 |
≤0.2 |
≤0.2 |
≤0.3 |
≤0.2 |
Fe is the basis.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
| Rolled steel. Annealing in air or in water from 1100-1150 °C |
| - |
≥255 |
≥520 |
≥30 |
≥47 |
| 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 1050-1100 °C |
| - |
- |
≥490 |
≥35 |
- |
| Bars hot rolled and forged according to GOST 5949-75. Annealing in air or in water 1100-1150 °C |
|
≥295 |
≥590 |
≥35 |
≥50 |
| Rolled steel. Annealing in air or in water from 1100-1150 °C |
| - |
≥210 |
≥490 |
≥35 |
≥50 |
| - |
≥165 |
≥320 |
≥40 |
≥55 |
| - |
≥110 |
≥195 |
≥50 |
≥63 |
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 |
Physical characteristics
| Temperature |
r, кг/м3 |
l, Вт/(м · °С) |
a, 10-6 1/°С |
| 0 |
7720 |
- |
- |
| 20 |
7720 |
- |
- |
| 100 |
7680 |
15 |
161 |
| 800 |
7440 |
27 |
181 |
| 900 |
7390 |
29 |
185 |
| 500 |
- |
22 |
- |
| 600 |
- |
24 |
178 |
| 700 |
- |
25 |
178 |
| 300 |
- |
- |
161 |
| 1000 |
- |
- |
185 |
| 1200 |
- |
- |
188 |
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 |
| Propensity to temper brittleness |
inclined in the range of 600-800 With due to the formation of b-phase |
| Forging temperature |
Beginning - 1170 °C, the end - 850 °C air Cooling. |
