Steel 9X2
9X2 steel
Steel 9X2: 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 9X2.
General information on steel 9X2
| Grade substitute |
| steel 9Х1. |
| Delivery type |
| Rolls OST 24.013.20−85, OST 24.013.04−83. |
| Application |
| Working and supporting rolls of two- and four-roll stands of sheet rolling mills for cold rolling of metals. Working and supporting forged rolls of sheet mills for hot rolling of metals. |
Chemical composition of 9X2 steel
| Chemical element |
% |
| Silicon (Si) |
0.25−0.50 |
| Manganese (Mn) |
0.20−0.70 |
| Nickel (Ni), not more |
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 steel 9X2
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 |
| Barrels or mandrels of backup rolls (after heat treatment) with increased hardness requirements, type 4 |
<1600 |
HSD 70−85 |
| Drums or backup roll tires (after heat treatment) with increased hardness requirements, type 5 |
<1600 |
HSD 45−69 |
| Worker’s and back-up roll necks |
|
HSD 30−55 |
| Working roll necks of hot strip mills. Normalization. Tempering. |
<1000 |
HSD 35−55 |
| Barrels of working rolls of hot rolling mills. Hardening. Tempering. |
<1000 |
HSD 45−60 |
| Working roll necks of hot rolling mills. Normalization. Tempering. |
|
HSD 30−60 |
| Shafts of composite support rolls for hot rolling mills. Normalization. Tempering. |
<1600 |
HSD 60−85 |
Mechanical properties at elevated temperatures
| t test,°C |
σ0, 2, MPa |
σB, MPa |
δ5, % |
ψ, % |
| 6 mm diameter specimen, 30 mm long, forged and annealed. Strain rate 16 mm/minute. Strain rate 0.009 1/s. |
| 700 |
125 |
160 |
45 |
83 |
| 800 |
100 |
135 |
47 |
91 |
| 900 |
105 |
135 |
51 |
|
| 1000 |
41 |
50 |
53 |
100 |
| 1100 |
21 |
30 |
75 |
100 |
| 1200 |
11 |
12 |
71 |
100 |
Technological properties of steel 9X2
| Forging temperature |
| Starts at 1180, ends at 800. Sections up to 300 mm are cooled in the pit. |
| Weldability |
| Not applicable for welded constructions. |
| Machinability |
| In the annealed state at HB 187−196 and σB = 680 MPa Kυ dv.spl. = 0.95, Kυ b.st. = 0.55. |
| The tendency to tempering capacity |
| inclined |
| Flocke sensitivity |
| sensitive |
Steel 9X2 critical point temperature
| Critical point |
°С |
| Ac1 |
756 |
| Ac3 |
783 |
Hardenability of steel 9X2
| Face distance, mm / HRCe |
| 1.5 |
3 |
6 |
9 |
21 |
36 |
45 |
60 |
| 66 |
65,5 |
65 |
63,5 |
47 |
38,5 |
35,5 |
35 |
