9XS steel
9ХС steel
Steel 9ÕÑ: Handbook of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperatures, physical, mechanical, technological and foundry properties for the grade — Steel 9ÕÑ.
General information on 9XS steel
| Substitute for the brand |
| Steel grade: ХВГ, ХВСГ. |
| Type of delivery |
| Circle 9ÕÑ, sheet 9ÕÑ, strip 9ÕÑ, forging 9ÕÑ, section rolled products, including shaped: GOST 5950−73, GOST 2590−71, GOST 2591−71. Calibrated bar GOST 5950−73, GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silversilver GOST 5950−73, GOST 14955−77. Strip GOST 5950−73, GOST 4405−75. Forged and forged blanks GOST 5950−73, GOST 1133−71. |
| Application |
| Drills, reamers, taps, dies, combs, cutters, machine dies, stamps for cold work. Responsible parts which material should have high wear resistance, fatigue strength under bending, torsion, contact loading, as well as elastic properties. |
Chemical composition of 9ХС steel
| Chemical element |
% |
| Vanadium (V), not more |
0.15 |
| Tungsten (W), not more |
0.20 |
| Silicon (Si) |
1.20−1.60 |
| Manganese (Mn) |
0.30−0.60 |
| Copper (Cu), not more than |
0.30 |
| Molybdenum (Mo), not more than |
0.20 |
| Nickel (Ni), not more than |
0.35 |
| Sulfur (S), not more than |
0.030 |
| Titanium (Ti), not more than |
0.03 |
| Carbon (C) |
0.85−0.95 |
| Phosphorus (P), not more than |
0.030 |
| Chromium (Cr) |
0.95−1.25 |
Mechanical properties of 9ХС steel
Mechanical properties
| Heat treatment, delivery condition |
Section, mm |
σ0.2, MPa |
σB, MPa |
ψ, % |
HB |
HRCe |
| Isothermal annealing at 790−810°C. Isothermal holding temperature 710 °C. |
|
295−390 |
590−690 |
50−60 |
|
197−241 |
| Quenching at 870 °C, oil. Tempering 180−240°C |
<40 |
|
|
|
59−63 |
|
| Quenching at 870 °C, oil. Tempering 450−500°C |
<30 |
|
|
|
46−50 |
|
Mechanical properties at elevated temperatures
| t test,°C |
σ0, 2, MPa |
σB, MPa |
δ5, % |
ψ, % |
KCU, J/m2 |
HB |
| Delivery condition |
| 20 |
445 |
790 |
26 |
54 |
39 |
243 |
| 200 |
320 |
710 |
22 |
48 |
88 |
218 |
| 400 |
330 |
620 |
32 |
63 |
98 |
213 |
| 600 |
170 |
200 |
52 |
77 |
|
172 |
| 700 |
83 |
98 |
58 |
77 |
147 |
|
| Specimen with a diameter of 10 mm, length 50 mm, rolled. Deformation rate 20 mm/minute. Strain rate 0.007 1/s. |
| 800 |
110 |
130 |
26 |
68 |
|
|
| 900 |
65 |
74 |
41 |
95 |
|
|
| 1000 |
42 |
46 |
52 |
|
|
|
| 1100 |
20 |
31 |
54 |
|
|
|
| 1200 |
15 |
20 |
83 |
100 |
|
|
Technological properties of 9ХС steel
| Forging temperature |
| The beginning 1180, the end 800. Cooling of blanks with cross section up to 200 mm in the well. |
| Weldability |
| Not applicable for welded structures. Acceptable to CTS. |
| Machinability |
| In a hot-rolled condition at NV 221 Kυ dv.spl. = 0.90, Kυ b.st. = 0.50. |
| Tendency to tempering ability |
| inclined |
| Floc-sensitivity |
| not sensitive |
Temperature of critical points of 9ХС steel
| Critical point |
°С |
| Ac1 |
770 |
| Ac3 |
870 |
| Ar1 |
730 |
| Mn |
160 |
Steel hardness 9HS
| Delivery condition, heat treatment regime |
HRCe surface |
| Hardening 840−860 С, water. Tempering 170−200 С. |
63−64 |
| Tempering at 840−860°C with water. Tempering 200−300°C. |
59−63 |
| Tempering at 840−860°C with water. Tempering 300−400 C. |
53−59 |
| Tempering at 840−860°C with water. Tempering 400−500 C. |
48−53 |
| Tempering at 840−860°C with water. Tempering 500−600 C. |
39−48 |
Hardenability of steel 9ХС
| Face-off distance, mm / HRCe |
| 5 |
10 |
15 |
20 |
25 |
30 |
40 |
50 |
60 |
| 63 |
56 |
36,5 |
32 |
30 |
28 |
26 |
25 |
24 |
| Heat treatment |
Crit. dia. in oil, mm |
| Hardening |
15−50 |
Physical properties of 9ХС steel
| Test temperature, °C |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Modulus of normal elasticity, E, GPa |
190 |
|
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|
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| Torsional shear modulus of elasticity G, GPa |
79 |
|
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| Steel density, pn, kg/m3 |
7830 |
|
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| Electrical resistivity (p, nominal value — m) |
400 |
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Heat resistance, red resistance of steel 9ХС
Heat resistance
| Temperature, °C |
Time, h |
Hardness, HRCэ |
| 150−160 |
1 |
63 |
| 240−250 |
1 |
59 |
