Steel 58 (55PP)
Description
Steel 58 (55PP)
Steel 58 (55PP): a brand of steels and alloys. Below is a systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the brand — Steel 58 (55PP).
General steel 58 (55PP)
| Substitute brand |
| steel: 30ХГТ, 20ХГНТР, 20ХН2М, 12ХН3А, 18ХГТ. |
| Delivery type |
| Long products, including shaped: GOST 1050−74, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 7414−75, GOST 8559−75. Polished bar and silver bar GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1131−71. |
| Application |
| parts with thin sections of reinforcing elements: gears of the middle module, bushings, plates and other parts; after surface hardening with HFC heating — parts that require high wear resistance with a viscous core, operating at high speeds and medium specific pressures. |
Chemical composition of steel 58 (55PP)
| Chemical element |
% |
| Silicon (Si) |
0.10−0.30 |
| Manganese (Mn), no more |
0.20 |
| Copper (Cu), no more |
0.25 |
| Arsenic (As), no more |
0.08 |
| Nickel (Ni), no more |
0.25 |
| Sulfur (S), no more |
0.04 |
| Carbon (C) |
0.55−0.63 |
| Phosphorus (P), no more |
0.035 |
| Chromium (Cr), no more |
0.15 |
Mechanical properties of steel 58 (55PP)
Mechanical properties
| Heat treatment, delivery condition |
Section, mm |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HRC e |
| Hot rolled steel, forged, calibrated and silver grade 2 after normalization |
25 |
315 |
600 |
12 |
28 |
|
|
| Normalization at 850 ° C. |
| |
130 |
300 |
600 |
ten |
25 |
35 |
22 |
| Hardening 850 ° C (induction heating rate 30 deg / s), cooling with a water shower. Vacation 180 ° С, exposure 1.5 h. |
| |
6 |
1900−2100 |
2100−2300 |
3−5 |
25−30 |
20−40 |
58−69 |
Technological properties of steel 58 (55PP)
| Forging temperature |
| Beginning 1265, end 1080. |
| Weldability |
| Not applicable for welded structures. |
| Tendency to release ability |
| Not inclined. |
| Flock sensitivity |
| Not sensitive. |
Temperature of critical points of steel 58 (55PP)
| Critical point |
° C |
| Ac1 |
720 |
| Ac3 |
785 |
Impact strength of steel 58 (55PP)
Impact strength, KCU, J / cm 2
| Delivery status, heat treatment |
+20 |
HRCэ |
-20 |
-thirty |
-40 |
| Samples without incision |
78 |
59 |
56 |
24 |
29 |
| |
59 |
61 |
29 |
20 |
24 |
