Steel 25KH13N2 (ЭИ474)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
25Х13Н2 |
| Designation GOST Latin |
25X13H2 |
| Transliteration |
25H13N2 |
| The chemical elements |
25Cr13Н2 |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ474 |
| Designation GOST Latin |
EI474 |
| Transliteration |
EhI474 |
| The chemical elements |
- |
Description
25KH13N2 steel is used: for the manufacture methods of hot and cold deformation and machining parts with high ductility, load and operating at temperatures up to +450−500 °C; products exposed to slightly aggressive media at room temperature; the various parts of the aircraft; parts for automatic lathes, which require a high corrosion resistance in atmospheric conditions and increased hardness (HRC-50−54).
Note
Steel corrosion-resistant martensitic class.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006 |
| Sectional and shaped rolling |
В32 |
GOST 18907-73, OST 4-020.023-78, OST 4-020.024-78, OST 4-020.025-78, TU 14-1-721-73, TU 14-11-245-88 |
| Sheets and stripes |
В33 |
GOST 4405-75 |
| Classification, nomenclature and general norms |
В30 |
GOST 5632-72 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| TU 14-1-721-73 |
0.2-0.3 |
0.15-0.25 |
0.08-0.15 |
0.8-1.2 |
12-14 |
≤0.5 |
1.5-2 |
The rest |
- |
- |
- |
- |
- |
| GOST 5632-72 |
0.2-0.3 |
0.15-0.25 |
0.08-0.15 |
0.8-1.2 |
12-14 |
≤0.5 |
1.5-2 |
The rest |
≤0.3 |
≤0.2 |
≤0.2 |
≤0.3 |
≤0.2 |
Fe is the basis.
According to TU 14-1-721-73, the chemical composition is given for steel grade 25X13N2 (EI474). The permissible deviations from the chemical composition are in accordance with ChMTU 1-950-70.
Mechanical characteristics
| Section, mm |
t отпуска, °C |
σB, MPa |
d5, % |
Brinell hardness number, MPa |
HRC |
| Rolled steel. Annealing in air from 1030-1050 °C + Vacation |
| - |
200 |
≥1620 |
≥3 |
- |
≥55 |
| Bars hot rolled, polished grooved steel with special surface finish as supplied on the other 14-1-721-73. Annealing at 740-800 °C |
| - |
- |
686-980 |
- |
207-285 |
- |
| Bars of polished, processed on a given strength (TS) according to GOST 18907-73 |
| 1-30 |
- |
690-980 |
- |
- |
- |
| Rolled steel. Annealing in air from 1030-1050 °C + Vacation |
| - |
300 |
≥1590 |
≥7 |
- |
≥54 |
| Bars. Annealing or vacation at 740-800 °C |
| 5 |
- |
≥830 |
≥10 |
207-285 |
- |
| Rolled steel. Annealing in air from 1030-1050 °C + Vacation |
| - |
400 |
≥1530 |
≥3 |
- |
≥53 |
| - |
500 |
≥1470 |
≥3 |
- |
≥51 |
| - |
600 |
≥1220 |
≥6 |
- |
≥39 |
| - |
700 |
≥730 |
≥9 |
- |
≥30 |
| - |
800 |
≥710 |
≥9 |
- |
≥27 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Physical characteristics
| Temperature |
r, кг/м3 |
l, Вт/(м · °С) |
a, 10-6 1/°С |
| 20 |
7680 |
18 |
- |
| 100 |
- |
19 |
116 |
| 200 |
- |
20 |
12 |
| 300 |
- |
22 |
124 |
| 400 |
- |
24 |
124 |
| 600 |
- |
- |
128 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| G |
Modulus of elasticity shear torsion |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Forging temperature |
Start - 1150 °C, the end - of 800 °C. Cooling is carried out slowly in the furnace. |
| Machining by cutting |
Steel has the best machinability on the machines compared to the same steels. |
