Steel 40KH15N7G7F2MS (ЭИ388)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
40Х15Н7Г7Ф2МС |
| Designation GOST Latin |
40X15H7G7F2MC |
| Transliteration |
40H15N7G7F2MS |
| The chemical elements |
40Cr15Н7Mn7V2MoС |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ388 |
| Designation GOST Latin |
EI388 |
| Transliteration |
EhI388 |
| The chemical elements |
- |
Description
40KH15N7G7F2MS steel is used: for the manufacture of gas turbine blades and fasteners that have an expiration date at a temperature of 650 °C.
Note
Steel alloy heat-resistant, precipitation hardening, austenitic.
The recommended maximum operating temperature for a limited period of work +650 °C.
The temperature of beginning of intensive scaling in air +800 °C.
Standards
| Name |
Code |
Standards |
| Sheets and stripes |
В23 |
GOST 103-2006 |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Sheets and stripes |
В33 |
GOST 4405-75 |
| 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 14-1-1763-76, TU 14-1-714-73, TU 14-11-245-88 |
| Bulls. Blanks. Slabs |
В21 |
OST 1 90176-75 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 5632-72 |
0.38-0.47 |
≤0.02 |
≤0.035 |
6-8 |
14-16 |
0.9-1.4 |
6-8 |
The rest |
≤0.3 |
1.5-1.9 |
≤0.2 |
0.65-0.95 |
≤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 |
| Bars hot rolled and forged according to GOST 5949-75. Quenching in water or air with 1170-1190 °C + Aging at 780-820 °C (8-10 h exposure), air cooling |
|
≥590 |
≥880 |
≥15 |
≥15 |
≥294 |
- |
| Rolled steel. Quenching in water from 1180 °C (aging for 1 h) + Quenching in air from 1,000 °C (aging for 1 h), air cooling |
| - |
≥480 |
≥940 |
≥30 |
≥28 |
- |
- |
| Rolled steel. Quenching in water from 1180 °C (aging for 1 h) + Quenching in air from 1,000 °C (aging for 1 h), cooling air (indicated temperature and time of heat exposure) |
| - |
≥510 |
≥930 |
≥22 |
≥18 |
≥24 |
- |
| Forming at OST 1 90176-75. Quenching in water or air with 1170-1190 °C (exposure 30-45 min) + Aging at 780-820 °C (8-10 h exposure), air cooling |
|
- |
≥883 |
≥15 |
≥15 |
- |
255-341 |
| Rolled steel. Quenching in water from 1180 °C (aging for 1 h) + Quenching in air from 1,000 °C (aging for 1 h), air cooling |
| - |
≥360 |
≥640 |
≥16 |
≥24 |
- |
- |
| Rolled steel. Quenching in water from 1180 °C (aging for 1 h) + Quenching in air from 1,000 °C (aging for 1 h), cooling air (indicated temperature and time of heat exposure) |
| - |
≥470 |
≥810 |
≥18 |
≥15 |
≥20 |
- |
| Rolled steel. Quenching in water or air with 1170-1190 °C + Ageing at 800 °C (8-10 h exposure), air cooling |
| - |
≥600 |
≥1000 |
≥15 |
≥15 |
- |
- |
| Rolled steel. Quenching in water from 1180 °C (aging for 1 h) + Quenching in air from 1,000 °C (aging for 1 h), cooling air (indicated temperature and time of heat exposure) |
| - |
≥490 |
≥880 |
≥19 |
≥17 |
≥20 |
- |
| Rolled steel. Quenching in water or air with 1170-1190 °C + Ageing at 800 °C (8-10 h exposure), air cooling |
| - |
≥550 |
≥810 |
≥13 |
≥26 |
- |
- |
| - |
≥540 |
≥780 |
≥12 |
≥23 |
- |
- |
| - |
- |
≥700 |
≥12 |
≥23 |
- |
- |
| - |
≥500 |
≥640 |
≥9 |
≥23 |
- |
- |
| - |
≥430 |
≥520 |
≥8 |
≥23 |
- |
- |
| - |
≥280 |
≥380 |
≥8 |
≥17 |
- |
- |
| - |
- |
≥250 |
≥7 |
≥18 |
- |
- |
| - |
- |
≥160 |
≥6 |
≥21 |
- |
- |
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 |
185 |
7800 |
- |
- |
| 200 |
187 |
7720 |
16 |
177 |
| 300 |
157 |
7680 |
18 |
184 |
| 400 |
147 |
7630 |
20 |
191 |
| 500 |
147 |
7580 |
22 |
205 |
| 600 |
147 |
7530 |
24 |
205 |
| 700 |
118 |
- |
26 |
- |
| 800 |
118 |
- |
- |
208 |
| 100 |
- |
7770 |
14 |
17 |
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 |
| Forging temperature |
Start - 1160 °C, the end - 1000 °C. |
