High NiCr Indefinite Chilled Composite Spin-Cast Iron Roll
Introduction
This type of indefinite chilled cast iron roll is made of high chromium, nickel and molybdenum alloy elements. It has a double chemical. Through alloying in ordinary high nickel-chromium molten steel, the strong carbide-forming elements like niobium, tungsten, and vanadium are added at a certain ratio, and the type of carbides is changed to form high-hardness and finely mixed carbides while changing the density of precipitated particles. The outside has high tensile strength and the inside is a lower one. The hardness drop is lower, so it has high wear resistance.
Application
bar & wire rod mill, hot strip mill, cold strip mill, PC mill, section mill, plate rolling mill and nonferrous mill etc.
Chemical Composition
Roll name | C | Si | Mn | P | S | Ni | Cr | Mo |
Cr-Mo infinite chilled cast iron roll | 3.20~3.70 | 0.80~1.20 | 0.60~1.00 | ≤0.20 | ≤0.10 | / | 0.60~1.20 | 0.20~0.60 |
Ni-Cr-Mo infinite chilled cast iron roll（I） | 3.20~3.70 | 0.80~1.20 | 0.60~1.00 | ≤0.20 | ≤0.10 | 0.50~1.00 | 0.70~1.20 | 0.20~0.60 |
Ni-Cr-Mo infinite chilled cast iron roll（II） | 3.20~3.70 | 0.60~1.00 | 0.60~1.00 | ≤0.20 | ≤0.10 | 1.01~2.00 | 0.70~1.20 | 0.20~0.60 |
Ni-Cr-Mo infinite chilled cast iron roll（III） | 3.20~3.70 | 0.60~1.00 | 0.60~1.00 | ≤0.20 | ≤0.10 | 2.01~3.00 | 0.70~1.20 | 0.20~0.6 |
Physical Properties
Roll name | Roll-body hardness HSD | Roll-neck hardness HSD | Tensile strength Mpa |
Cr-Mo infinite chilled cast iron roll | 55~70 | 35~55 | ＞160 |
Ni-Cr-Mo infinite chilled cast iron roll（I） | 60~72 | 35~55 | ＞160 |
Ni-Cr-Mo infinite chilled cast iron roll（II） | 62~72 | 35~55 | ＞160 |
Ni-Cr-Mo infinite chilled cast iron roll（III） | 65~75 | 35~55 | ＞160 |
Metallographic Structure
Roll name | Metallurgical structure |
Cr-Mo infinite chilled cast iron roll | Pearlite + cementite + a little graphite |
Ni-Cr-Mo infinite chilled cast iron roll（I） | Pearlite + cementite + a little graphite |
Ni-Cr-Mo infinite chilled cast iron roll（II） | Fine pearlite + cementite + a small amount of graphite |
Ni-Cr-Mo infinite chilled cast iron roll（III） | Type body + cementite + a small amount of graphite |
