Steel 25KHGT
Description
Steel 25KHGT
Steel 25KHGT: a brand of steels and alloys. Below is the systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the grade — Steel 25HGT.
General information about steel 25HGT
| Substitute brand |
| Steel: 18HGT, 30HGT, 25HGM. |
| Delivery type |
| Long products, including shaped: GOST 4543−71, GOST 259071, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 1051−73. Polished bar and silver bar GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71. |
| Application |
| Loaded gears and other parts, the hardness of which is more than HRCэ59. |
Chemical composition of steel 25HGT
| Chemical element |
% |
| Silicon (Si) |
0.17−0.37 |
| Manganese (Mn) |
0.80−1.10 |
| Copper (Cu), no more |
0.30 |
| Nickel (Ni), no more |
0.30 |
| Sulfur (S), no more |
0.035 |
| Titanium (Ti) |
0.03−0.09 |
| Carbon (C) |
0.22−0.29 |
| Phosphorus (P), no more |
0.035 |
| Chromium (Cr) |
1.00−1.30 |
Mechanical properties of steel 25HGT
| Heat treatment, delivery condition |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
| Bar. Normalization 880−950 ° C, air. Hardening 850 ° С, oil. Vacation 200 ° C, water, oil or air. |
980 |
1270 |
ten |
50 |
69 |
| Cementation 920−950 ° С, air. Hardening 840−860 ° С, oil. Vacation 190−210 ° С, air. |
1100 |
1500 |
nine |
|
60 |
Technological properties of steel 25HGT
| Forging temperature |
| Beginning 1220, end 800. |
| Weldability |
| RDS, KTS, subsequent heat treatment is required. |
| Tendency to release ability |
| inclined |
| Flock sensitivity |
| sensitive |
