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Alloy graphite steel roll for seamless steel tube continuous rolling machine and preparation method thereof

A technology of seamless steel pipe and graphite steel, applied in the direction of rolls, metal rolling, metal rolling, etc., can solve the problems of easy failure of rolls, improve brightness, improve crack resistance and wear resistance, and ensure uniformity Effect

Inactive Publication Date: 2019-04-30
常州市力创轧辊有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an alloy graphite steel roll for continuous rolling mill of seamless steel pipe and its preparation method, so as to solve the problem that the roll is prone to failure

Method used

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  • Alloy graphite steel roll for seamless steel tube continuous rolling machine and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The chemical composition of an alloy graphite steel roll for a seamless steel pipe continuous rolling mill is:

[0032] C: 1.60%; Si: 1.60%; Mn: 1.20%; Cr: 1.50%; Ni: 2.00%; Mo: 0.40%; V: 0.40%; Nb: 0.20%; P: 0.03%; S: 0.015%; Re: 10%; the remainder is Fe and unavoidable impurities.

[0033] The matrix metallographic structure of alloy graphite steel rolls for continuous rolling mills of seamless steel pipes is Cr 23 C 6 、Mo 2 C 6 , NbC, V 4 C 3 Granular carbide + tempered sorbite + bainite.

[0034] A preparation method of an alloy graphite steel roll for a seamless steel pipe continuous rolling mill, comprising the following steps:

[0035] (1) Configuration chemical composition: C: 1.60%; Si: 1.60%; Mn: 1.20%; Cr: 1.50%; Ni: 2.00%; Mo: 0.40%; V: 0.40%; Nb: 0.20%; P: 0.03 %; S: 0.015%; Re: 10%; the rest is Fe and unavoidable impurities;

[0036] (2) Smelting: Add the configured chemical components into the electric melting furnace for smelting, and when the t...

Embodiment 2

[0040] The chemical composition of an alloy graphite steel roll for a seamless steel pipe continuous rolling mill is:

[0041] C: 1.80%; Si: 0.80%; Mn: 0.60%; Cr: 1.50%; Ni: 1.00%; Mo: 0.80%; V: 0.20%; Nb: 0.40%; P: 0.025%; S: 0.025%; Re: 0.05%; the remainder is Fe and unavoidable impurities.

[0042] The matrix metallographic structure of alloy graphite steel rolls for continuous rolling mills of seamless steel pipes is Cr 23 C 6 、Mo 2 C 6 , NbC, V 4 C 3 Granular carbide + tempered sorbite + bainite.

[0043] A preparation method of an alloy graphite steel roll for a seamless steel pipe continuous rolling mill, comprising the following steps:

[0044] (1) Configuration chemical composition: C: 1.80%; Si: 0.80%; Mn: 0.60%; Cr: 1.50%; Ni: 1.00%; Mo: 0.80%; V: 0.20%; Nb: 0.40%; %; S: 0.025%; Re: 0.05%; the rest is Fe and unavoidable impurities;

[0045] (2) Smelting: Add the configured chemical components into the electric melting furnace for smelting, and when the temp...

Embodiment 3

[0049] The chemical composition of an alloy graphite steel roll for a seamless steel pipe continuous rolling mill is:

[0050] C: 1.70%; Si: 1.20%; Mn: 1.00%; Cr: 1.15%; Ni: 1.50%; Mo: 0.60%; V: 0.30%; Nb: 0.30%; P: 0.025%; S: 0.020%; Re: 0.075%; the remainder is Fe and unavoidable impurities.

[0051] The matrix metallographic structure of alloy graphite steel rolls for continuous rolling mills of seamless steel pipes is Cr 23 C 6 、Mo 2 C 6 , NbC, V 4 C 3 Granular carbide + tempered sorbite + bainite.

[0052] A preparation method of an alloy graphite steel roll for a seamless steel pipe continuous rolling mill, comprising the following steps:

[0053] (1) Configuration chemical composition: C: 1.70%; Si: 1.20%; Mn: 1.00%; Cr: 1.15%; Ni: 1.50%; Mo: 0.60%; V: 0.30%; Nb: 0.30%; P: 0.025 %; S: 0.020%; Re: 0.075%; the rest is Fe and unavoidable impurities;

[0054] (2) Smelting: Add the configured chemical components into the electric melting furnace for smelting, and wh...

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Abstract

The invention relates to an alloy graphite steel roll for a seamless steel tube continuous rolling machine and a preparation method thereof. The alloy graphite steel roll comprises 1.60-1.80% of C, 0.80-1.60% of Si, 0.60-1.20% of Mn, 0.80-1.50% of Cr, 1.00-2.00% of Ni, 0.40-0.80% of Mo, 0.20-0.40% of V, 0.20-0.40% of Nb, less than or equal to 0.03% of P, less than or equal to 0.025% of S, 0.05-0.10% of Re, and the balance Fe. The above components are subjected to smelting, slag removal, nodulizing and inoculation, then are subjected to pouring and are treated through a special heat treatment method, so that the wear resistance and heat crack resistant performance are improved. Meanwhile, graphite achieves the good lubrication effect. The service life of the roll is prolonged. The surface brightness of a rolled seamless steel tube is improved. Compared with existing pearlite ductile cast iron and needle-like bainite ductile cast iron rolls, the rolling quantity of the alloy graphite steel roll is increased by 80% or moe.

Description

technical field [0001] The invention belongs to the technical field of roll production for continuous rolling mills of seamless steel pipes, and in particular relates to an alloy graphite steel rolling roll for continuous rolling mills of seamless steel pipes and a preparation method thereof. Background technique [0002] For the continuous rolling mill of seamless steel pipe, since the temperature of the capillary is about 1100°C when the capillary is sent to the continuous rolling mill, the roll is heated more seriously. At the same time, there is a lot of oxide scale on the surface of the capillary, which will inevitably increase the roll pass. The 1-3 stands of the continuous rolling mill are in the sharp deformation zone of the capillary tube, and the wall reduction of a single stand can reach 70% at the highest, so the rolling force and rolling moment are very large. The main materials are centrifugally cast pearlitic ductile iron and centrifugally cast acicular bainit...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/56C22C33/04C21D1/26C21D1/28C21D9/38B21B27/02
CPCB21B27/024C21D1/26C21D1/28C21D9/38C21D2211/002C21D2211/004C22C33/04C22C38/005C22C38/02C22C38/04C22C38/34C22C38/44C22C38/46C22C38/48C22C38/56
Inventor 裴力军蒋志芳
Owner 常州市力创轧辊有限公司
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