Steel 15ХФ
Description
Steel 15ХФ
Steel 15HF: 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 15HF.
General information about steel 15HF
| Substitute brand |
| Steel 20KHF. |
| Delivery type |
| Long products, including shaped: GOST 4543−71, GOST 259071, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 10702−78. Polished bar and silver bar GOST 14955−77, GOST 4543−71. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 4543−71. |
| Application |
| For small parts subject to carburizing and low tempering hardening (gear wheels, piston pins, distributor rollers, plungers, copiers). |
Chemical composition of steel 15HF
| Chemical element |
% |
| Vanadium (V) |
0.06−0.12 |
| Silicon (Si) |
0.17−0.37 |
| Manganese (Mn) |
0.40−0.70 |
| Copper (Cu), no more |
0.30 |
| Nickel (Ni), no more |
0.30 |
| Sulfur (S), no more |
0.035 |
| Carbon (C) |
0.12−0.18 |
| Phosphorus (P), no more |
0.035 |
| Chromium (Cr) |
0.80−1.10 |
Mechanical properties of steel 15HF
| Heat treatment, delivery condition |
Section, mm |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HRC e |
| Bar. Hardening 880 ° C, water or oil. Hardening 760−810 ° C, water or oil. Vacation 180 ° C, air or oil. |
fifteen |
540 |
730 |
thirteen |
50 |
78 |
|
| Cementation 930 ° C, 12 h. Normalization 875 ° C, air. Hardening 800 ° C, oil. Vacation 200 ° С |
|
350−380 |
610−690 |
16−20 |
43−55 |
59−98 |
59−63 |
| Cementation at 930 ° C, 12 h. Quenching at 875 ° C, oil. Hardening 840 ° С, oil, tempering 200 ° С |
25 |
720−760 |
960−980 |
9−12 |
50−58 |
78−98 |
59−63 |
Mechanical properties at elevated temperatures
| test t, ° C |
σ B, MPa |
δ 10 ,% |
ψ,% |
| Sample 10 mm in diameter and 100 mm long. Annealing. The speed of movement of the grips of the testing machine is 0.4−0.5 mm / min. |
| 800 |
57 |
23 |
62 |
| 900 |
47 |
26 |
34 |
| 1000 |
32 |
43 |
68 |
| 1100 |
24 |
47 |
94 |
| 1200 |
19 |
60 |
99 |
Technological properties of steel 15HF
| Forging temperature |
| Beginning 1250, end 800. Forgings with a cross section of more than 60 mm are cooled slowly. |
| Weldability |
| KTS is welded without restrictions, RDS — with heating and subsequent heat treatment. |
| Tendency to release ability |
| not inclined |
| Flock sensitivity |
| insensitive |
Temperature of critical points of steel 15HF
| Critical point |
° C |
| Ac1 |
741 |
| Ac3 |
843 |
| Ar3 |
788 |
| Ar1 |
704 |
| Mn |
435 |
Hardenability of steel 15HF
Hardening 900 C. Hardness for strips of hardenability HRCe.
| Distance from the end, mm / HRC e |
| 3 |
6 |
nine |
12 |
| 37.5 |
28 |
22.5 |
20 |
| Heat treatment |
Amount of martensite,% |
Crit. Diam. in oil, mm |
| Hardening |
50 |
12 |
Physical properties of steel 15HF
| Test temperature, ° С |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Normal elastic modulus, E, GPa |
206 |
|
|
|
|
|
|
|
|
|
| Density of steel, pn, kg / m 3 |
7760 |
7730 |
7710 |
7670 |
7640 |
7600 |
7570 |
7530 |
|
|
| Thermal conductivity coefficient W / (m ° С) |
|
43 |
42 |
42 |
40 |
36 |
34 |
thirty |
|
|
| Ud. electrical resistance (p, Nom. m) |
|
281 |
345 |
421 |
513 |
606 |
731 |
833 |
|
|
| 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) |
11.9 |
12.4 |
13.1 |
13.7 |
14.2 |
14.5 |
14.9 |
|
|
|
