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Novel high carbon graphite steel roll ring and preparation method thereof

A graphite steel, high carbon technology, applied in furnace types, manufacturing tools, heat treatment equipment, etc., can solve the problems of thermal crack resistance, low roller ring hardness, poor wear resistance, etc., to reduce element segregation, reduce casting Stress, thermal crack reduction effect

Active Publication Date: 2017-05-10
江苏凯达重工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The development of economic construction has put forward higher requirements for the quantity and quality of the roll ring. The existing roll ring is prone to severe segregation of alloy elements during the production process. The elements with high density are enriched in the outer layer of the roll ring, and the elements with low density are rich in Collected in the inner layer of the roll ring, which makes the roll ring have low hardness, poor wear resistance, long production cycle, and prone to thermal cracks and poor thermal fatigue resistance, which directly affect the output and quality of the roll ring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] [Example 1] The three-layer chemical composition of the new high-carbon graphite steel roll ring of the present invention is: outer chemical composition C: 2.30%; Si: 1.50%; Mn: 1.00%; Cr: 1.00%; Ni: 3.20%; Mo: 0.60%; V: 0.30%; Nb: 0.30%; P: 0.025%; S: 0.025%; Ba+Ca: 0.45%; Re: 0.20%; ; Mn: 0.60%; Cr: 0.30%; Ni: 0.20%; Mo: 0.15%; P: 0.025%; S: 0.025%; P: 0.025%; S: 0.025%. The balance is Fe and a small amount of residual elements.

[0021] When the new high-carbon graphite steel roll ring is cast, the casting temperature is 60°C of liquidus temperature.

[0022] The design value of the surface hardness of the new high carbon graphite steel roller ring is 65-75HSD, the actual product is 66.2HSD, the design value of the hardness drop from the surface of the roller ring to the groove bottom is ≤2HSD, and the actual product is 1.7HSD.

[0023] The metallographic structure of the new high carbon graphite steel roll ring matrix is: spherical graphite + Mo 2 C 6 , NbC, V ...

Embodiment 2

[0030] [Example 2] The three-layer chemical composition of the new high-carbon graphite steel roll ring of the present invention is: outer chemical composition C: 2.40%; Si: 1.40%; Mn: 0.70%; Cr: 0.60%; Ni: 3.10%; Mo: 0.80%; V: 0.50%; Nb: 0.35%; P: 0.015%; S: 0.010%; Ba+Ca: 0.55%; Re: 0.25%; ; Mn: 0.70%; Cr: 0.35%; Ni: 0.25%; Mo: 0.25%; P: 0.020%; S: 0.020%; P: 0.015%; S: 0.010%. The balance is Fe and a small amount of residual elements.

[0031] When the new high-carbon graphite steel roll ring is cast, the casting temperature is 70°C of liquidus temperature.

[0032] The design value of the surface hardness of the new high carbon graphite steel roller ring is 65-75HSD, the actual product is 67.4HSD, the design value of the hardness drop from the surface of the roller ring to the groove bottom is ≤2HSD, and the actual product is 1.8HSD.

[0033] Step 2. Pouring: The new high-carbon graphite steel roller ring adopts a centrifugal three-layer composite casting process. By ad...

Embodiment 3

[0034][Example 3] The three-layer chemical composition of the new high-carbon graphite steel roll ring of the present invention is: outer chemical composition C: 2.50%; Si: 1.60%; Mn: 1.00%; Cr: 0.90%; Ni: 3.40%; Mo: 0.80%; V: 0.50%; Nb: 0.50%; P: 0.005%; S: 0.005%; Ba+Ca: 0.65%; Re: 0.30%; ; Mn: 0.80%; Cr: 0.40%; Ni: 0.40%; Mo: 0.25%; P: 0.010%; S: 0.010%; P: 0.017%; S: 0.018%. The balance is Fe and a small amount of residual elements.

[0035] When the new high-carbon graphite steel roll ring is cast, the casting temperature is 80°C of liquidus temperature.

[0036] The design value of the surface hardness of the new high carbon graphite steel roller ring is 65-75HSD, the actual product is 71.3HSD, the design value of the hardness drop from the surface of the roller ring to the groove bottom is ≤2HSD, and the actual product is 1.4HSD.

[0037] Step 2. Pouring: The new high-carbon graphite steel roll ring adopts a centrifugal three-layer composite casting process. By addin...

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PUM

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Abstract

The invention relates to a preparation method of a novel high carbon graphite steel roll ring. The roll ring is prepared by the following steps: adopting a centrifugal three-layer composite casting process, by adding alloy of special carbide elements V, Nb, Mo and the like, tapping when the temperature of a liquid phase reaches +120-150 DEG C, carrying out spheroidization treatment with 0.30-0.60 percent of BaCa, carrying out inoculation with 0.50-0.60 percent of CaSi as an inoculant after spheroidization, then carrying out killing for 3-8min and pouring, and carrying out special heat treatment by cold opening a box to obtain a finished product with the roll ring surface hardness and the matrix microstructure according with the requirements. Compared with an ordinary roll ring, according to the novel high carbon graphite steel roll ring, by adding the special carbide elements, through spheroidization treatment by the BaCa and inoculation by the CaSi as the inoculant, special fine grained carbides which are distributed uniformly and spheroidal graphite with the antioxidant capacity and the lubrication action are cultivated, so that the comprehensive performance of the roll ring is improved, and the service life of the roll ring is prolonged.

Description

technical field [0001] The invention relates to a novel high-carbon graphite steel roll ring and a preparation method thereof. Background technique [0002] The development of economic construction puts forward higher requirements on the quantity and quality of the roll ring. The existing roll ring is prone to serious segregation of alloy elements in the production process. The elements with high density are enriched in the outer layer of the roll ring, and the elements with low density are rich It is integrated in the inner layer of the roller ring, which makes the roller ring have problems such as low hardness, poor wear resistance, long preparation period, and prone to thermal cracks and poor thermal fatigue resistance, which directly affects the output and quality of the roller ring. Therefore, it is necessary to develop a new type to solve the above drawbacks. SUMMARY OF THE INVENTION [0003] In view of the above drawbacks, the present invention first provides a tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/08C22C37/04C22C38/02C22C38/04C22C38/44C22C38/34C22C33/08B22D13/02C21D1/30C21D1/28C21D1/18C21D9/38C21D5/00
CPCB22D13/02C21D1/18C21D1/28C21D1/30C21D5/00C21D9/38C21D2211/002C21D2211/004C21D2211/006C21D2211/008C22C33/08C22C37/04C22C37/08C22C37/10C22C38/02C22C38/04C22C38/34C22C38/44
Inventor 许健周国祥蒋志芳
Owner 江苏凯达重工股份有限公司
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