Alloy cast steel roll for hot rolling mill
Description
Through different chemical composition and heat treatments, the work layer of cast steel rolls could be obtain pearlitic, sobitic, tempered sorbitic and bainitic matrix. With small granularity of carbides, the cast steel rolls possess better tensile strength and tenacity as well as excellent biting properties and thermal cracking resistance.
Chemical Analysis
| Grades |
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
| AS60I |
0.55/0.65 |
0.20/0.6 |
0.5/1.0 |
≤0.035 |
≤0.03 |
0.2/1.5 |
0.80/1.20 |
0.2/0.6 |
| AS65I |
0.60/0.70 |
0.20/0.60 |
0.5/0.8 |
≤0.035 |
≤0.03 |
0.2/0.5 |
0.80/1.20 |
0.2/0.45 |
| AS70 |
0.65/0.75 |
0.20/0.45 |
0.9/1.2 |
≤0.035 |
≤0.03 |
|
|
|
| AS70I |
0.65/0.75 |
0.20/0.45 |
1.4/1.8 |
≤0.035 |
≤0.03 |
|
|
|
| AS70II |
0.65/0.75 |
0.20/0.45 |
1.4/1.8 |
≤0.035 |
≤0.03 |
|
|
0.2/0.45 |
| AS75 |
0.70/0.80 |
0.20/0.45 |
0.6/0.9 |
≤0.035 |
≤0.03 |
|
0.75/1.00 |
0.2/0.45 |
| AS75I |
0.70/0.80 |
0.20/0.7 |
0.7/1.1 |
≤0.035 |
≤0.03 |
≥0.2 |
0.8/1.5 |
0.2/0.6 |
Physical Properties
| Designation of rolls |
Barrel hardness (HSD) |
Tensile strength (MPa) |
Elongation (%) |
Impact toughness (J/cm) |
| AS60I |
35~45 |
≥600 |
≥5 |
≥8 |
| AS65I |
35~45 |
≥600 |
≥5 |
≥8 |
| AS70 |
32~42 |
≥600 |
≥5 |
≥8 |
| AS70I |
35~45 |
≥600 |
≥5 |
≥8 |
| AS70II |
35~45 |
≥600 |
≥5 |
≥8 |
| AS75 |
35~45, 40~50 |
≥600 |
≥5 |
≥8 |
| AS75I |
35~45, 40~50 |
≥600 |
≥5 |
≥8 |
Microstructure
Microstructure of working layer in the barrel: perlite or tempered sorbite
Application
Billet, slab blooming mill, roughing standsof section mill, back-up rolls of hot strip mill
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