Properties
Thanks to its high content of M7C3 type carbide in the range of 20-30% and discontinuous network distribution of carbide, the roll offers a high wear-resistance performance. The matrix consist of tempered martensitic and sorbite with finely-dispersed secondary carbides (M7C3, M23C6 and M3C types), increasing therefore the wear-resistance of roll, the Cr2O3 enriched oxide film on the roll surfaces is highly resistant to oxidization and plastic strain, making the roll extremely suitable for steel hot rolling process.
 
Chemical Analysis
|
Grades |
HSC |
C |
Si |
Mn |
Ni |
Cr |
Mo |
|
HCr¢ñ |
60~75 |
2.3/3.3 |
0.3/1.0 |
0.5/1.2 |
0.7/1.7 |
12.0/15.0 |
0.7/1.5 |
|
HCr¢ò |
65~80 |
2.3/3.3 |
0.3/1.0 |
0.5/1.2 |
0.7/1.7 |
15.0/18.0 |
0.7/1.5 |
|
HCr¢ó |
75~90 |
2.3/3.3 |
0.3/1.0 |
0.5/1.2 |
0.7/1.7 |
18.0/22.0 |
1.5/3.0 |
Physical Properties
|
properties |
Barrel |
Nick/corel ¨C grey cast iron |
Nick/corel ¨C SG cast iron |
|
Tensile strength (N/mm2) |
850 |
200 |
400 |
|
Bending strength (N/mm2) |
1300 |
350 |
835 |
Microstructure
HCr¢ñ: bainite + martensite + carbide
HCr¢ò: tempered martensite + eutectic carbide + small percentage secondary carbide
HCr¢ó: tempered martensite + eutectic carbide + small percentage secondary carbide
Application
Work rolls for roughing stands and front finishing stands of hot strip mill, work rolls for wide and medium plate mill
|
