Steel 40KHS
Description
Steel 40KHS
Steel 40KhS: steels and alloys brand. 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 40XC.
General information of steel 40ХС
| Substitute brand |
| Steel: 38ХС, 35ХГТ. |
| 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 1051−73, GOST 4543−71. Polished bar and silver bar GOST 4543−71, GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71. |
| Application |
| Shafts, gears, couplings, pins and other small-sized upgradable parts that require high strength, elasticity and wear resistance. |
Chemical composition of 40KhS steel
| Chemical element |
% |
| Silicon (Si) |
1.20−1.60 |
| Manganese (Mn) |
0.30−0.60 |
| Copper (Cu), no more |
0.30 |
| Nickel (Ni), no more |
0.30 |
| Sulfur (S), no more |
0.035 |
| Carbon (C) |
0.37−0.45 |
| Phosphorus (P), no more |
0.035 |
| Chromium (Cr) |
1.30−1.60 |
Mechanical properties of steel 40ХС
Mechanical properties depending on the tempering temperature
| vacation t, ° С |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HB |
| Hardening 900 ° C, oil. Cooling after air release. |
| 200 |
1670 |
1960 |
ten |
40 |
59 |
575 |
| 300 |
1570 |
1810 |
ten |
43 |
29 |
530 |
| 400 |
1370 |
1580 |
ten |
45 |
59 |
460 |
| 500 |
1100 |
1320 |
eleven |
50 |
60 |
380 |
| 600 |
900 |
1030 |
sixteen |
55 |
78 |
320 |
Mechanical properties depending on the section
| Section, mm |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HB |
| Bar. Hardening 900 ° C, oil. Vacation 640 ° C, water. |
| 20 |
800 |
960 |
19 |
62 |
122 |
270 |
| 40 |
730 |
930 |
19 |
59 |
108 |
265 |
| 60 |
700 |
870 |
19 |
54 |
88 |
250 |
| 80 |
670 |
850 |
19 |
52 |
78 |
230 |
Mechanical properties of the bar
| Heat treatment, delivery condition |
Section, mm |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HRC e |
| Hardening 900 ° C, water or oil. Vacation 540 ° C, water or oil |
25 |
1080 |
1220 |
12 |
40 |
34 |
|
| Isothermal quenching 900−910 ° C, nitrate at 330−350 ° C, then air cooling. |
25 |
1080 |
1220 |
12 |
40 |
49 |
|
| Hardening 900−920 ° C, oil. Vacation 240−260 ° С, air. |
40 |
|
1670 |
8 |
40 |
39 |
46−51 |
| Hardening 870−890 ° C, water or oil. Vacation 600−650 ° C, water or oil. |
110 |
640 |
830 |
fifteen |
50 |
88 |
|
Technological properties of steel 40ХС
| Forging temperature |
| Beginning 1150, end 850. Sections larger than 75 mm are cooled slowly. |
| Weldability |
| difficult to weld. |
| Tendency to release ability |
| inclined |
| Flock sensitivity |
| sensitive |
Temperature of critical points of steel 40ХС
| Critical point |
° C |
| Ac1 |
763 |
| Ac3 |
810 |
| Ar3 |
735 |
| Ar1 |
680 |
| Mn |
320 |
Impact strength of steel 40ХС
Impact strength, KCU, J / cm 2
| Delivery status, heat treatment |
+20 |
-20 |
-40 |
| Annealing 880 C. Quenching 900 C, oil. Vacation 640 S. |
78 |
55 |
51 |
Physical properties of steel 40ХС
| Test temperature, ° С |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Normal elastic modulus, E, GPa |
219 |
|
|
|
|
|
|
|
|
|
| Torsional shear elastic modulus G, GPa |
85 |
|
|
|
|
|
|
|
|
|
| Density of steel, pn, kg / m 3 |
7740 |
7720 |
7690 |
|
7620 |
|
7540 |
|
|
|
| Thermal conductivity coefficient W / (m ° С) |
|
|
36 |
|
35 |
|
34 |
|
|
|
| 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) |
11.7 |
12.7 |
13.4 |
14.0 |
14.4 |
14.8 |
|
|
|
|
