Steel 18KH12VMBFR (ЭИ993)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
18Х12ВМБФР |
| Designation GOST Latin |
18X12BMBFP |
| Transliteration |
18H12VMBFR |
| The chemical elements |
18Cr12WMoNbVB |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ993 |
| Designation GOST Latin |
EI993 |
| Transliteration |
EhI993 |
| The chemical elements |
- |
Description
18KH12VMBFR steel is used: for the production of forgings, steam turbine blades, pipes and fasteners for long service life at temperatures up to +620 °C; for the manufacture by cold machining and hot forming fasteners turbines and flange connections, steam pipes and fittings, operating at a steam temperature 500−580 °C.
Note
Martensite steel-ferritic class.
The recommended maximum operating temperature for a very long time +500 °C. the Temperature of beginning of intensive scaling in air +750 °C.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006 |
| Classification, nomenclature and general norms |
В30 |
GOST 5632-72 |
| Sectional and shaped rolling |
В32 |
GOST 5949-75, TU 14-1-552-72, TU 14-11-245-88 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
B |
Ti |
Mo |
Nb |
W |
| GOST 5632-72 |
0.15-0.22 |
≤0.025 |
≤0.03 |
≤0.5 |
11-13 |
≤0.5 |
≤0.6 |
The rest |
≤0.3 |
0.15-0.18 |
≤0.003 |
≤0.2 |
0.4-0.6 |
0.2-0.4 |
0.4-0.7 |
| TU 14-1-552-72 |
0.15-0.22 |
≤0.025 |
≤0.03 |
≤0.5 |
11-13 |
≤0.5 |
≤0.6 |
The rest |
≤0.3 |
0.15-0.18 |
≤0.003 |
≤0.2 |
0.4-0.6 |
0.2-0.4 |
0.4-0.7 |
Fe is the basis.
According to TU 14-1-552-72, the chemical composition is given for steel grade 18Х12ВМБФР-Ш (ЭИ993-Ш).
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
| Bars hot rolled and forged (12-180 mm) square and round. Quenching in oil with 1030-1050 °C to + Leave at 680-720 °C, air cooling |
|
≥670 |
≥780 |
≥12 |
≥45 |
≥590 |
| Bars hot rolled and forged according to GOST 5949-75. Quenching in oil from 1050-1150 °C + Vacation at 650-700 °C , cooling in air or in oil |
|
≥490 |
≥740 |
≥12 |
≥45 |
≥392 |
| Pipe. Normalization at 1050 °C, air cooling + Vacation at 750 °C (extract 3 hours), air cooling |
| 21927 |
≥590 |
≥750 |
≥15 |
≥43 |
≥400 |
| 306 |
≥640 |
≥820 |
≥17 |
≥56 |
≥900 |
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) |
a, 10-6 1/°С |
| 20 |
228 |
7850 |
276 |
- |
| 200 |
215 |
- |
24 |
1113 |
| 300 |
209 |
- |
251 |
1142 |
| 400 |
195 |
- |
263 |
118 |
| 500 |
188 |
- |
272 |
12 |
| 600 |
173 |
- |
28 |
125 |
| 700 |
155 |
- |
289 |
1265 |
| 100 |
- |
- |
218 |
1115 |
| 800 |
- |
- |
- |
116 |
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 |
does not apply to welded structures |
