Steel ШХ15СГ
Description
Steel ШХ15СГ
Steel ШХ15СГ: 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 grade — Steel ShKh15SG.
General information about steel ШХ15СГ
| Substitute brand |
| steel: KhVG, ShKh15, 9KhS, KHVSG. |
| Delivery type |
| long products, incl. shaped: GOST 801−78, GOST 2590−71, GOST 2591−71. Calibrated bar GOST 801−78, GOST 7417−75. Polished bar and silver bar GOST 14955−77. Strip GOST 103−76. |
| Application |
| large-sized rings of ball and roller bearings with walls more than 20−30 mm thick; balls with a diameter of more than 50 mm; rollers with a diameter of more than 35 mm. |
Chemical composition of steel ШХ15СГ
| Chemical element |
% |
| Silicon (Si) |
0.40−0.65 |
| Manganese (Mn) |
0.90−1.20 |
| Copper (Cu), no more |
0.25 |
| Nickel (Ni), no more |
0.30 |
| Sulfur (S), no more |
0.020 |
| Carbon (C) |
0.95−1.05 |
| Phosphorus (P), no more |
0.027 |
| Chromium (Cr) |
1.30−1.65 |
Mechanical properties of steel ШХ15СГ
Mechanical properties
| Heat treatment, delivery condition |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HB |
| Annealing 790−810 ° C, cooling with a furnace to 730 ° C, from 730 to 650 ° C at a rate of 10−20 deg / h, then in air. (annealing isothermal) |
370−410 |
590−730 |
15−25 |
35−55 |
44 |
179−217 |
| Hardening 810−840 ° С, oil. Vacation 150 ° C, air. |
|
1960−2350 |
|
|
3−7 |
|
Mechanical properties depending on the tempering temperature
| vacation t, ° С |
σ 0.2, MPa |
σ B, MPa |
HRC e |
| Hardening 820 ° С, oil. |
| 160 |
2250−2370 |
1960−2350 |
62−65 |
| 200 |
2130−2280 |
2160−2550 |
60−62 |
| 250 |
2120−2200 |
|
59−61 |
| 300 |
1860−2040 |
|
58−59 |
| 330 |
1850−1950 |
|
56−57 |
Technological properties of steel ШХ15СГ
| Forging temperature |
| Beginning 1150, end 800. Sections up to 250 mm are cooled in air, 251−350 mm — in a pit. |
| Weldability |
| method of welding KTS. |
| Machinability by cutting |
| In the hot-rolled state at HB 202 and σ B = 740 MPa K υ tv.spl. = 0.90, K υ b.st. = 0.36. |
| Tendency to release ability |
| inclined |
| Flock sensitivity |
| sensitive |
Temperature of critical points of steel ШХ15СГ
| Critical point |
° C |
| Ac1 |
750 |
| Ac3 |
910 |
| Ar1 |
688 |
| Mn |
205 |
Endurance limit of steel ШХ15СГ
| σ -1, MPa |
n |
Heat treatment, steel condition |
| 559 |
4E + 7 |
HB 621−643 |
| 696 |
|
HB 643−659 |
| 657 |
|
HB 616−627 |
| 637 |
|
HB 587−601 |
Hardenability of steel ШХ15СГ
Hardening 850 ° C.
| Distance from the end, mm / HRC e |
| 1.5 |
3 |
4.5 |
6 |
nine |
12 |
fifteen |
27 |
39 |
51 |
| 65−67.5 |
65−67.5 |
65−67.5 |
65−67.5 |
65−67.5 |
62.5−67.5 |
56−66.5 |
36−54.5 |
31−41.5 |
27.5−37.5 |
| Amount of martensite,% |
Crit. Diam. in water, mm |
Crit. Diam. in oil, mm |
Crete. hardness, HRCэ |
| 50 |
73−102 |
45−68 |
57 |
| 90 |
60−88 |
36−59 |
62 |
Physical properties of steel ШХ15СГ
| Test temperature, ° С |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Normal elastic modulus, E, GPa |
211 |
|
|
|
|
|
|
|
|
|
| Torsional shear elastic modulus G, GPa |
79 |
|
|
|
|
|
|
|
|
|
| Density of steel, pn, kg / m 3 |
7650 |
|
|
|
|
|
|
|
|
|
| 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) |
|
13.4 |
13.6 |
|
|
|
|
|
|
|
