Low-alloy composite roller and manufacturing method thereof

A technology of composite rolls and manufacturing methods, applied in metal rolling, metal rolling, rolls, etc., can solve the problems of high Ni content of precious metals, reduced hardness and wear resistance, and increased cost, so as to improve toughness and uniformity of hardness , uniform hardness, and improved wear resistance

Inactive Publication Date: 2018-01-12
HUBEI GOLD STANDARD GENERAL ROLLER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The Chinese invention patent "Manufacturing method of large-scale high-toughness and wear-resistant alloy roll" (authorized announcement number CN102019294B) discloses a large-size roll manufacturing method for grain crushing machinery with a diameter of more than 800mm, by adding a relatively high noble metal element Ni (3.6 ~4.2wt%), Cr (1.2~1.8wt%), etc., and through controlled rolling isothermal transformation, carbide, lower bainite and retained austenite (10~35%) are obtained, and the toughness of the roll is improved, but Due to the high content of retained austenite, the hardness and wear resistance are reduced, while the high content of precious metal Ni leads to increased costs

Method used

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  • Low-alloy composite roller and manufacturing method thereof
  • Low-alloy composite roller and manufacturing method thereof
  • Low-alloy composite roller and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The low-alloy composite roll in the present invention can be used as a wear-resistant roll for food machinery, which includes an outer white cast iron layer and an inner gray cast iron layer; and in terms of mass percentage, the outer white cast iron layer includes: C 3.0~3.60%, Si0.50~1.0%, Mn 0.50~1.0%, Cr 0.50~1.50%, Ni 0.50~1.50%, Mo 0.20~1.0%, V0.10~0.80%, Ti 0.10~0.30%, Ce 0.10-0.30%, P<0.15%, S<0.10%, the rest is Fe; the inner gray cast iron layer includes: C 3.0-3.5%, Si 1.5-2.5%, Mn 0.5-1.0%, and the rest is  …

[0031] Preferably, in terms of mass percentage, the outer white cast iron includes: C 3.38-3.52%, Si 0.54-0.56%, Mn 0.70-0.83%, Cr 1.00-1.40%, Ni 0.73-1.40%, Mo 0.20% ~0.60%, V 0.20~0.40%, Ti 0.10~0.15%, Ce 0.12~0.014%, P 0.10~0.12%, S 0.02~0.05%, and the rest is Fe.

[0032] Among them, the carbon (C) content of the outer white cast iron layer is 3.0 to 3.60%. C is the most important factor determining the hardness of carbides and matrix in low alloy...

Embodiment 2

[0058] The composition ratio of the outer white cast iron layer in this embodiment is shown in Table 1. The only difference from Embodiment 1 is that in step S2, the pouring temperature is 1450°C, and the speed of the pouring machine is 1000 rpm; In step S3, the pouring temperature is 1390°C; in step S5, the annealing temperature is 10 hours.

[0059] After testing, the surface Rockwell hardness of the composite roll obtained by the manufacturing method of this embodiment is 53.8-55.2HRC, and there is no cracking phenomenon.

Embodiment 3

[0061] The composition ratio of the outer white cast iron layer in this embodiment is shown in Table 1. The only difference from the above embodiment is that in step S2, the pouring temperature is 1450° C., and the pouring machine rotates at 1000 rpm; In step S3, the pouring temperature is 1380°C; in step S5, the annealing temperature is 8 hours.

[0062] After testing, the surface Rockwell hardness of the composite roll obtained by the manufacturing method of this embodiment is 53.5-55.5 HRC, and there is no cracking phenomenon.

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Abstract

The invention discloses a low-alloy composite roller and a manufacturing method of the low-alloy composite roller. The composite roller comprises an outer white cast iron layer and an inner grey castiron layer. The outer white cast iron layer is prepared from, by mass, 3.0-3.60% of C, 0.50-1.0% of Si, 0.50-1.0% of Mn, 0.50-1.50% of Cr, 0.50-1.50% of Ni, 0.20-1.0% of Mo, 0.10-0.80% of V, 0.10-0.30% of Ti, 0.10-0.30% of Ce, P with the content less than 0.15%, S with the content less than 0.10% and the balance Fe. The inner grey cast iron layer is prepared from, by mass, 3.0-3.5% of C, 1.5-2.5%of Si, 0.5-1.0% of Mn and the balance Fe. The toughness and hardness uniformity of the roller can be improved, the hardness of the composite roller is larger than 53HRC, and the wear resistance of theroller is effectively improved.

Description

technical field [0001] The invention relates to the technical field of light industrial machinery manufacturing, in particular to a low-alloy composite roll and a manufacturing method thereof. Background technique [0002] The low-alloy cast iron roll is the key component of the noodle grinding machine, and the surface of the roll is required to have certain hardness and impact toughness. Low-alloy composite rolls produced by centrifugal casting are widely used at home and abroad because of their simple production process, low price and high wear resistance. In order to obtain higher hardness, the carbon content of the roll manufactured by the existing technology is relatively high (3.60-3.70wt%). In the actual production process, due to improper control of the composition and process, composition segregation often occurs, resulting in uneven structure and coarse Carbide distributed in strips, resulting in uneven hardness and low toughness on the surface of the roll. During...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/08C22C33/08B22D19/16C21D1/30C21D9/38B32B15/01B32B15/18B21B27/00
CPCY02P10/20
Inventor 闫玉荣宋新莉方勤波苏海根马玉喜李平生肖万宏
Owner HUBEI GOLD STANDARD GENERAL ROLLER
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