P9 steel
P9 steel
Steel P9: 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 P9.
General information about steel P9
| Substitute for the brand |
| steel Р18. |
| Delivery type |
| Sections, including shaped: GOST 19265−73, GOST 2590−71, GOST 2591−71. Calibrated bar GOST 19265−73, GOST 7417−75. Grinded rod and silver GOST 19265−73, GOST 14955−77. Thick plate TU 14−1-1408−75. Sheet thin TU 14−1-1408−75, TU 14−1-1706−76. Tape GOST 2283−79. GOST 19265−73, GOST 4405−75. Forgings and forged blanks GOST 19265−73, GOST 1133−71. |
| Application |
| For the manufacture of tools of simple shape that do not require a large amount of grinding, for processing of conventional structural materials. |
Chemical composition of steel P9
| Chemical element |
% |
| Vanadium (V) |
2.30−2.70 |
| Tungsten (W) |
8.50−9.50 |
| Cobalt (Co), not more than |
0.50 |
| Silicon (Si), not more than |
0.50 |
| Manganese (Mn), not more than |
0.50 |
| Molybdenum (Mo), not more than |
1.0 |
| Nickel (Ni), not more than |
0.40 |
| Sulfur (S), not more than |
0.03 |
| Carbon (C) |
0.85−0.95 |
| Phosphorus (P), max. |
0.03 |
| Chrome (Cr) |
3.80−4.40 |
Mechanical properties of P9 steel
Mechanical properties depending on tempering temperature
| t tempering temperature, °C |
σB, MPa |
KCU, J/m2 |
HRCe |
| Quenching at 1230 °C, oil. Tempering three times in 1 h. |
| 200 |
1030 |
10 |
|
| 300 |
1080 |
52 |
|
| 400 |
1270 |
49 |
|
| 500 |
1470 |
39 |
|
| 540 |
|
|
66 |
| 580 |
|
|
64 |
| 600 |
1960 |
26 |
|
| 620 |
|
|
61 |
| 660 |
|
|
54 |
Technological properties of P9 steel
| Forging temperature |
| Beginning 1200, end 900. Cooling in the wells at 750−800 C. |
| Weldability |
| The weldability is good when electrically joined with steel 45 and 40X. |
| The machinability by cutting |
| At HB 205−255 Kυ dv.spl. = 0.8, Kυ b.st. = 0.6. |
| Grindability |
| reduced (GOST 19265−73). |
Steel critical point temperature P9
| Critical point |
°С |
| Ac1 |
820 |
| Ac3 |
870 |
| Ar3 |
780 |
| Ar1 |
740 |
| Mn |
180 |
Physical properties of steel P9
| Test temperature, °C |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Modulus of normal elasticity, E, GPa |
220 |
|
|
|
|
|
|
|
|
|
| Torsional shear modulus of elasticity G, GPa |
83 |
|
|
|
|
|
|
|
|
|
| Steel density, pn, kg/m3 |
8300 |
|
|
|
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|
|
| Thermal conductivity coefficient W/(m — °C) |
|
23 |
25 |
26 |
28 |
30 |
31 |
|
|
|
| Electrical resistivity (p, nominal value — m) |
380 |
417 |
505 |
600 |
695 |
790 |
900 |
1020 |
1160 |
1170 |
Heat resistance, red resistance of steel P9
Heat resistance
| Temperature, °C |
Time, h |
Hardness, HRCэ |
| 580 |
4 |
63 |
| 620 |
4 |
59 |
