Alloy cast steel roll is made of top-grade molten steel by arc furnace and advanced casting and technology of heating processing with high intensity, excellent thermal cracking resistance, toughness and abrasive resistance, applicable to rough and medium roll of profile steel, rough mill of hot rolled strip steel and supporting roll of hot rolled strip steel. Metallographic structure of roll is made of pearlite or tempered sorbite system.
Chemical composition
Mark | C | Si | Mn | Cr | Ni | Mo |
AS60A(60CrNiMnMo) | 0.55-0.65 | 0.20-0.60 | 0.60-2.00 | 1.40-2.20 | ≤0.60 | 0.30-0.60 |
AS70A(70Mn2) | 0.65-0.75 | 0.20-0.45 | 1.40-1.80 |
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AS70B(70Mn2Mo) | 0.65-0.75 | 0.20-0.45 | 1.40-1.80 | - |
| 0.20-0.45 |
AS75(75CrMo) | 0.70-0.80 | 0.20-0.45 | 0.60-0.90 | 0.75-1.00 | - | 0.20-0.60 |
AS75A(75CrNiMo) | 0.70-0.80 | 0.20-0.70 | 0.70-1.10 | 0.80-1.50 | 0.20-0.80 | 0.20-0.60 |
AS75B(75Cr3NiMo) | 0.70-0.80 | 0.20-0.60 | 0.70-1.10 | 1.50-3.60 | 0.40-1.00 | 0.20-0.80 |
Chemical Composition
Mark | Hardness（HS） | Tensile strength（Mpa） | Elongation Coefficient（%） | Purpose |
AS60A | 45-55 | ＞700 | ＞8 | Rough roll for cogging process of large profile steel with requirement to toughness and abrasive resistance |
AS70A | 34-44 | ＞680 | ＞7 | Rough milling machine for medium and small profile steel, rod and wire materials, rough roll and vertical roll for hot rolled strip steel |
AS70B | 36-46 | ＞680 | ＞7 |
AS75 | 36-46 | ＞680 | ＞6 |
AS75A | 35-55 | ＞800 | ＞7 |
AS75B | 40-60 | ＞800 | ＞7 | Cogging and rough milling, support roll for hot rolled steel |
