Steel 65
Description
Steel 65
Steel 65: 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 Steel 65 grade.
General steel 65
| Substitute brand |
| steel: 65, 70 |
| Delivery type |
| Long products, including shaped: GOST 14959−79, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 7419.0−78, GOST 7419.1−78, GOST 7419.3−78, GOST 7419.5−78 — GOST 7419.8 -78. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78. Polished bar and silver bar GOST 14955−77, GOST 7419.0−78, GOST 7419.1−78, GOST 7419.3−78, GOST 7419.5−78 — GOST 7419.8−78. Tape GOST 1530−78, GOST 2284−79. Strip GOST 103−76, GOST 4405−75, GOST 1577−81, GOST 82−70, GOST 7419.2−78, GOST 7419.4−78. Forgings and forged billets GOST 1133−71. Wire GOST 9389−75. Thick sheet GOST 1577−81, GOST 19903−74. |
| Application |
| springs, springs and other parts that require increased strength and elasticity properties, wear resistance; parts operating under frictional conditions with high static and vibration loads. |
Chemical composition of steel 65
| Chemical element |
% |
| Silicon (Si) |
0.17−0.37 |
| Manganese (Mn) |
0.50−0.80 |
| Copper (Cu), no more |
0.20 |
| Nickel (Ni), no more |
0.25 |
| Sulfur (S), no more |
0.035 |
| Carbon (C) |
0.62−0.70 |
| Phosphorus (P), no more |
0.035 |
| Chromium (Cr), no more |
0.25 |
Mechanical properties of steel 65
Mechanical properties
| Heat treatment, delivery condition |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
δ 4 ,% |
ψ,% |
| Steel categories: 3.3A, 3B, 3V, 3G, 4.4A, 4B. Hardening 830 ° С, oil. Vacation 470 ° C. |
785 |
980 |
ten |
|
35 |
| Cold rolled annealed strip |
|
450−750 |
|
ten |
|
| Normalization 820 ° C, air. |
415 |
820 |
|
19 |
33 |
| Annealing at 820 ° C. |
415 |
810 |
|
22 |
33 |
Mechanical properties at elevated temperatures
| test t, ° C |
σ B, MPa |
δ 5 ,% |
ψ,% |
HB |
| Hardening 800 ° C, oil. Vacation 600−620 ° C. |
| 100 |
690 |
sixteen |
|
185 |
| 200 |
640 |
fourteen |
19 |
185 |
| 300 |
730 |
eighteen |
20 |
185 |
| 400 |
600 |
22 |
25 |
170 |
| 500 |
450 |
27 |
35 |
140 |
| 600 |
280 |
33 |
50 |
120 |
Mechanical properties depending on the tempering temperature
| vacation t, ° С |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
HRC e |
| Hardening 800 ° C, oil (section 12 mm) |
| 400 |
810 |
1220 |
five |
|
45 |
| 500 |
760 |
1130 |
thirteen |
40 |
32 |
| 600 |
650 |
930 |
eighteen |
52 |
23 |
Technological properties of steel 65
| Forging temperature |
| Beginning 1230, end 830. Air cooling. |
| Weldability |
| not applicable for welded structures. |
| Tendency to release ability |
| not inclined |
Temperature of critical points of steel 65
| Critical point |
° C |
| Ac1 |
727 |
| Ac3 |
752 |
| Ar3 |
730 |
| Ar1 |
696 |
| Mn |
285 |
Endurance limit steel 65
| σ -1, MPa |
σ B, MPa |
σ 0.2, MPa |
Heat treatment, steel condition |
| 296 |
770 |
350 |
Samples with a diameter of 15 mm. |
| 466 |
840 |
|
|
Hardenability of steel 65
Hardening 810 ° C.
| Distance from the end, mm / HRC e |
| 2.5 |
five |
7.5 |
ten |
fifteen |
20 |
25 |
thirty |
35 |
45 |
| 61 |
38 |
36.5 |
35.5 |
34 |
32 |
30.5 |
29 |
27.5 |
24 |
Physical properties of steel 65
| Test temperature, ° С |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Normal elastic modulus, E, GPa |
205 |
|
|
|
|
|
|
|
|
|
| Density of steel, pn, kg / m 3 |
7810 |
|
|
|
|
|
|
|
|
|
| Thermal conductivity coefficient W / (m ° С) |
|
68 |
53 |
|
36 |
31 |
|
|
|
|
| Test temperature, ° С |
20−100 |
20−200 |
20−300 |
20−400 |
20−500 |
20−600 |
20−700 |
20−800 |
20−900 |
20−1000 |
| Linear expansion coefficient (a, 10−6 1 / ° С) |
11.0 |
11.6 |
12.3 |
13.2 |
13.8 |
14.2 |
14.6 |
14.7 |
13.9 |
14.8 |
| Specific heat (C, J / (kg ° C)) |
483 |
|
|
525 |
|
|
|
|
|
|
