Brief introduction of work roll materials

Commonly used work roll materials are alloy forged steel, alloy cast steel and cast iron, etc.

(1) Alloy forged steel. Alloy forged steel for rolls has been specified in China's national standards, and steels for hot rolling and cold rolling are listed in GB/T 13314-1991. The steel for hot rolling rolls has 55Mn2, 55Cr, 60CrMnMo, 60SiMnMo, etc. The steel for cold rolling rolls is 9Cr, 9Cr2, 9CrV, 9Cr2W, 9Cr2Mo, 60CrMoV, 80CrN13W, 8CrMoV, etc.

(2) Alloy cast steel. There are not many types of alloy cast steel used for rolls, and there is no uniform standard. With the development of electro slag remelting technology, the quality of alloy cast steel is gradually increasing, and the future meeting of cast steel rolls will be widely used.

(3) Cast iron. Cast iron can be divided into ordinary cast iron, alloy cast iron and ductile iron. When casting rolls, different casts can be used to obtain cast iron rolls of different hardness. Therefore, there are semi-cold rolls, chill rolls and infinite chill rolls:

-Semi-cold roll. There is no obvious white layer on the surface of the roll, and the surface hardness of the roll is HS≥50.

-Chill rolls. The surface has a distinct white layer, the core is a gray layer, the middle is a layer of hemp, and the surface hardness of the roll is HS≥60.

-Infinite chill roll. The surface is a white mouth layer, but there is no obvious boundary between the white mouth layer and the gray mouth layer, and the roll surface hardness is HS ≥ 65.

Cast iron rolls have high hardness, smooth surface and wear resistance, and the manufacturing process is simple and inexpensive. The disadvantage is that the strength is lower than that of steel rolls. Only the strength of the ductile iron roll is good.