Steel 9X2MF
9Cr2MoV Steel
Steel 9X2MF: 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 9X2MF.
General information on 9Cr2MoV Steel
| Delivery type |
| Rolls OST 24.013.20−85, OST 24.013.04−83. |
| Application |
| Work rolls for mills for cold rolling of metals in particularly harsh conditions, work rolls of wire crimping and bar mills. |
Chemical composition of steel 9X2MF
| Chemical element |
% |
| Vanadium (V) |
0.10−0.20 |
| Silicon (Si) |
0.25−0.50 |
| Manganese (Mn) |
0.20−0.70 |
| Molybdenum (Mo) |
0.20−0.30 |
| Nickel (Ni), max. |
0.50 |
| Sulfur (S), not more than |
0.030 |
| Carbon (C) |
0.85−0.95 |
| Phosphorus (P), not more than |
0.030 |
| Chromium (Cr) |
1.70−2.10 |
Mechanical properties of 9Cr2MoV steel
Mechanical properties
| Heat treatment, delivery condition |
Section, mm |
HRCe |
| Barrels of work rolls (after induction heat treatment) of skin pass and finishing stands of cold rolling mills, type 1 |
<650 |
HSD 95−105 |
| Barrels of work rolls (after induction heating) of cold rolling stands, type 2 |
<900 |
HSD 90−96 |
| Barrels of work rolls (after induction heating) of hot strip mills, type 3 |
<900 |
HSD 75−90 |
| Worker’s necks |
<1000 |
HSD 30−55 |
| Barrels of work rolls of hot strip mills. Normalization. Tempering. |
<1000 |
HSD 35−55 |
| Hardening. Tempering. |
|
HSD 45−60 |
| Working roll necks of hot strip mills. Normalization. Tempering. |
<950 |
HSD 30−60 |
| Rolls barrels of rail and section mills. Normalization. Tempering. |
|
|
| Hardening 950 °C. Tempering at 150°C |
|
60 |
| Tempering 950 °C. Tempering 250°C |
|
59 |
| Hardening 950 °C. Tempering 350°C |
|
58 |
| Tempering 950 °C. Tempering 400°C |
|
55 |
| Tempering 950 °C. Tempering 500°C |
|
50 |
| Tempering 950 °C. Tempering 600°C |
|
45 |
Technological properties of steel 9X2MF
| Forging temperature |
| The beginning 1180, the end 800. Sections up to 300 mm are cooled in the pit. |
| Weldability |
| Not applicable for welded structures. |
| Machinability |
| In the annealed state at HB 170−207 and σB = 610 MPa Kυ dv.spl. = 0.85, Kυ b.st. = 0.80. |
| The tempering capacity |
| inclined |
| Flocke sensitivity |
| sensitive |
Temperature of critical points of 9Cr2MoV steel
| Critical point |
°С |
| Ac1 |
748 |
| Ac3 |
784 |
| Ar3 |
685 |
| Ar1 |
640 |
| Mn |
175 |
Steel hardness 9X2MF
| Delivery condition, heat treatment regime |
HRCэ surface |
HB |
HSD |
| Barrels of work rolls (after induction heat treatment): skin pass and finishing stands of cold rolling mills, type 1. Cross-section up to 650 mm. |
|
|
95−105 |
| Barrels of work rolls (after induction heat treatment): the stands of cold rolling mills, type 2. Cross-section up to 900 mm. |
|
|
90−96 |
| Barrels of work rolls (after induction heat treatment): mills warm rolling, type 3. Cross-section up to 900 mm. |
|
|
75−90 |
| Working roll necks |
|
|
30−55 |
| Barrels of work rolls of sheet mills for hot rolling. Cross-section up to 1000 mm. Normalization. Tempering. |
|
|
35−55 |
| Barrels of working rolls of sheet mills for hot rolling. Section up to 1000 mm. Hardening. Tempering. |
|
|
45−60 |
| Working roll necks of hot rolling mills. Normalization. Tempering. |
|
|
30−60 |
| Rolls barrels of rail and section mills. Section up to 950 mm. Normalization. Tempering. |
|
352−429 |
|
| Hardening 950 C. Tempering 150 C |
60 |
|
|
| Hardening 950 C. Tempering 250 C |
59 |
|
|
| Hardening 950 C. Tempering 350 C |
58 |
|
|
| Hardening 950 C. Tempering 400 C |
55 |
|
|
| Hardening 950 C. Tempering 500 C |
50 |
|
|
| Hardening 950 C. Tempering 600 C |
45 |
|
|
Hardenability of steel 9Х2МФ
| Distance from end face, mm / HRCe |
| 3 |
9 |
15 |
21 |
27 |
33 |
39 |
45 |
51 |
57 |
| 68 |
66 |
63 |
51,5 |
44 |
41,5 |
39,5 |
39,5 |
37,5 |
36,5 |
Physical properties of 9Cr2MoV steel
| Test temperature,°C |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Steel density, pn, kg/m3 |
7840 |
|
|
|
|
|
|
|
|
|
| Thermal conductivity coefficient W/(m — °C) |
|
37 |
34 |
32 |
32 |
32 |
30 |
23 |
20 |
14 |
| Test temperature,°C |
20−100 |
20−200 |
20−300 |
20−400 |
20−500 |
20−600 |
20−700 |
20−800 |
20−900 |
20−1000 |
| Specific heat capacity (C, J/(kg -°C)) |
440 |
460 |
500 |
570 |
680 |
800 |
940 |
1100 |
500 |
500 |
