Steel 8X3
Designation
| Name |
The value |
| Designation GOST Cyrillic |
8Х3 |
| Designation GOST Latin |
8X3 |
| Transliteration |
8H3 |
| The chemical elements |
8Cr3 |
Description
8X3 steel is used: for the manufacture of tools (punches, matrices), a hot landing fasteners and blanks made of carbon and low-alloy construction steels in the horizontal forging machines; parts of dies (dies, punches, ejectors) for hot pressing and extruding of these materials on crank presses with small-scale production; bending, trimming and cutting dies.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006 |
| Sheets and stripes |
В33 |
GOST 4405-75 |
| Sectional and shaped rolling |
В32 |
GOST 5950-2000, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-11-245-88 |
| Bulls. Blanks. Slabs |
В31 |
OST 24.952.01-89 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 5950-2000 |
0.75-0.85 |
≤0.03 |
≤0.03 |
0.15-0.45 |
3.2-3.8 |
0.1-0.4 |
≤0.4 |
The rest |
≤0.3 |
≤0.15 |
≤0.03 |
≤0.2 |
≤0.2 |
Fe is the basis.
Mechanical characteristics
| Section, mm |
t отпуска, °C |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
HRC |
| Rolled steel. Quenching in oil from 870 °C to + Leave at 500 °C (2H exposure) |
|
- |
≥1270 |
≥1340 |
≥8 |
≥25 |
≥343 |
- |
| Long products (samples). Quenching in oil from 870 °C to + Leave (exposure 2 hours) |
| - |
300 |
≥1800 |
≥1980 |
≥3 |
- |
- |
≥55 |
| Long products (samples). Quenching in oil from 870 °C to + Leave at 500 °C (exposure 2 hours) |
| - |
- |
≥1080 |
≥1270 |
≥8 |
≥27 |
- |
- |
| Rolled steel. - Heat to 650-700 °C. Quenching in oil with 820-850 °C + Vacation at 480-550 °C (aging 1 HR) |
|
- |
1420-1520 |
1470-1570 |
6-9 |
18-20 |
- |
44-48 |
| Long products (samples). Quenching in oil from 870 °C to + Leave (exposure 2 hours) |
| - |
400 |
≥1630 |
≥1710 |
≥6 |
≥10 |
- |
≥52 |
| Long products (samples). Quenching in oil from 870 °C to + Leave at 500 °C (exposure 2 hours) |
| - |
- |
≥1030 |
≥1220 |
≥10 |
≥28 |
- |
- |
| Long products (samples). Quenching in oil from 870 °C to + Leave (exposure 2 hours) |
| - |
500 |
≥1270 |
≥1340 |
≥8 |
≥25 |
- |
≥44 |
| Long products (samples). Quenching in oil from 870 °C to + Leave at 500 °C (exposure 2 hours) |
| - |
- |
≥930 |
≥1110 |
≥15 |
≥47 |
- |
- |
| - |
- |
≥640 |
≥800 |
≥20 |
≥65 |
- |
- |
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 |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Technological properties
| Name |
The value |
| Forging temperature |
Start - 1160 °C, the end - of 800 °C. slow Cooling in the wells. |
