Preparation method of nodular cast iron of alloy for roll
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An alloy ball and cast iron technology, applied in the field of preparation of ductile iron, can solve the problems of high-strength and low-alloy structural steel, serious spalling and crack tendency, low alloying degree, etc. The effect of increasing the single-groove rolling
Inactive Publication Date: 2014-02-05
QINGDAO LIANGLI PRECISION CASTING
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Problems solved by technology
[0003] Existing roll materials mostly use high-strength low-alloy structural steel. The degree of alloying of this type of material is low. After the final heat treatment, the depth of the hardened layer can only meet the general requirements, and the tendency of spalling and cracking is serious during use. Low rolling life
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Embodiment 1
[0019] The mass percent of alloy ductile iron for rolls in this example is: C: 3.6%, Si: 1.8%, Mn: 0.5%, P: 0.01%, S: 0.01%, Cr: 0.1%, Mo: 0.11% , Ni: 1.5%, Mg: 0.4%, Mo: 0.04%, Nb: 0.06%, Ti: 0.1%, V: 0.2%, and the balance is Fe and unavoidable trace elements.
Embodiment 2
[0021] The mass percent of the alloy ductile iron for the roll in this example is: C: 3.8%, Si: 2.0%, Mn: 0.7%, P: 0.04%, S: 0.01%, Cr: 0.3%, Mo: 0.14% , Ni: 2.0%, Mg: 0.6%, Mo: 0.06%, Nb: 0.1%, Ti: 0.15%, V: 0.4%, and the balance is Fe and unavoidable trace elements.
Embodiment 3
[0023] The mass percent of the alloy ductile iron for the roll in this example is: C: 3.7%, Si: 1.9%, Mn: 0.6%, P: 0.03%, S: 0.01%, Cr: 0.2%, Mo: 0.12% , Ni: 1.8%, Mg: 0.5%, Mo: 0.05%, Nb: 0.08%, Ti: 0.13%, V: 0.3%, and the balance is Fe and unavoidable trace elements.
[0024] Above-mentioned roll alloy ductile iron is to make by following method:
[0025] (1) Raw material smelting: according to the predetermined formula, take alloy ductile iron raw material pig iron for rolls, returned materials, scrap steel, vanadium ingots, molybdenum ingots, nickel ingots, niobium ingots, vanadium ingots, titanium ingots, and place them in the intermediate frequency furnace for melting. During the process, the temperature of molten iron is guaranteed to be 1450 0 ~1500 0 After smelting, detect the content of each element in the molten iron and adjust the content of each element until it meets the formula requirements. When the amount of molten iron in the ladle reaches the required weig...
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Abstract
The invention discloses a preparation method of nodular cast iron of alloy for a roll. The nodular cast iron comprises the following components in percentage by mass: 3.6-3.8% of C, 1.8-2.0% of Si, 0.5-0.7% of Mn, 0.01-0.04% of P, 0.01% of S, 0.1-0.3% of Cr, 0.11-0.14% of Mo, 1.5-2.0% of Ni, 0.4-0.6% of Mg, 0.04-0.06% of Mo, 0.06-0.1% of Nb, 0.1-0.15% of Ti, 0.2-0.4% of V and the balance of Fe and inevitable trace elements. According to the preparation method, matching of alloy elements is reasonably optimized, the mass percentages of Ni and Cr are optimized and Nb, Ti and V are added for improving the components of the roll, so that the morphology of carbides in the roll can be improved, the bending strength, impact toughness, deflection, area reduction rate, after-fracture elongation percentage and yield strength of the roll can be enhanced further, the problems that the inner surface layer of a hole slot in a finished-rolled roll body is peeled off can be solved, and the single-slot rolling quantity of a rolling mill can be increased.
Description
technical field [0001] The invention relates to a method for preparing nodular cast iron, in particular to a method for preparing alloy nodular cast iron for rolls. Background technique [0002] Iron and steel materials play an important role in social and economic life, and rolling steel into products requires a large amount of rolls. Therefore, the quality of the roll directly affects the quality and production cost of the steel. As the steel rolling process becomes increasingly automated, continuous and heavy-duty, the use conditions of the rolls are also becoming increasingly harsh. Equipping rolling mills with high-performance rolls has become an important research topic in the roll industry, and the optimization of roll materials is undoubtedly the basis for manufacturing high-performance rolls. [0003] Most of the existing roll materials are made of high-strength low-alloy structural steel. The degree of alloying of this type of material is low. After the final hea...
Claims
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