Nb-containing high-chromium iron roller

A technology of high-chromium iron and rolls, which is applied in the field of rolls, can solve the problems that cannot meet the requirements of hot-spot rolling mills, and achieve the effects of uniform structure changes, high wear resistance, and less shrinkage cavities

Active Publication Date: 2018-06-29
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing high chromium iron rolls can no longer meet the requirements of the work rolls in the front section of the hot strip mill

Method used

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  • Nb-containing high-chromium iron roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, the specification of the roll is ￠750 / 670×1830×4565, the thickness of the working layer of the roll is 40 mm, the hardness requirement is HSD76-80, and the composition design target of the working layer of the roll body is C2.40-2.50%, Si0.70- 0.80%, Mn0.90~1.00%, Cr17.00~18.00%, Ni1.00~1.10%, Mo1.20~1.30%, Nb1.00~1.10%, S≤0.10%, P≤0.05%, and the rest Fe and unavoidable impurities. The manufacturing method is as follows:

[0034] A. Smelting: ingredients are prepared according to the chemical composition of the working layer of the roll body, and then smelted in an induction furnace at a smelting temperature of 1450°C; the core of the roll is smelted in a blast furnace with pig iron as a raw material at a smelting temperature of 1500°C;

[0035] B. Centrifugal casting: Centrifugal pouring of the working layer of the roller body, the pouring temperature of molten iron is 1400°C, and the centrifuge speed is 700r / min during pouring;

[0036] C. Combined ...

Embodiment 5

[0048] Example 5 is a comparative example, no Nb is added during manufacture, and the rest is the same as Example 1. Table 3 shows the results of relative wear resistance, thermal fatigue test (600°C test temperature) and thermal shock test of the final rolled roll.

[0049] table 3

[0050]

[0051] It can be seen from Table 3 that the wear resistance of the roll containing Nb has been greatly improved compared with the roll without Nb, and the thermal cracking resistance and impact toughness have been significantly improved.

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Abstract

The invention discloses an Nb-containing high-chromium iron roller, which is applied to a hot strip mill finish rolling forepart work roll, and comprises a roller core and a roller body working layer.The roller body working layer is prepared from the following chemical components in percentage by mass: 2.20 to 3.00 percent of C, 0.30 to 1.00 percent of Si, 0.60 to 1.50 percent of Mn, 10.00 to 19.00 percent of Cr, 0.80 to 2.00 percent of Ni, 0.60 to 2.00 percent of Mo, 0.50 to 2.00 percent of Nb, less than or equal to 0.10 percent of S, less than or equal to 0.05 percent of P, and the balanceof Fe and inevitable impurities. According to the Nb-containing high-chromium iron roller provided by the invention, through adjusting alloy composition and a casting process, the organization structure of the roller can be improved, the wear resistance and the thermal crack resistance of the roller are improved, and the service life of the roller is prolonged.

Description

technical field [0001] The invention relates to a roll, in particular to a high-chromium iron roll used for the front-stage work roll of a hot-spot rolling mill. Background technique [0002] The high chromium iron roll is made of high chromium white wear-resistant cast iron with a carbon content of 2.3-3.3% and a chromium content of 12-22%. High-alloy composite cast iron roll produced by composite casting process. Usually in various alloy cast iron rolls, the carbide precipitated in the outer structure of the roll body with the solidification of molten iron is Fe 3 Type C, the hardness is 840 ~ 1100HV, and high chromium cast iron, because the molten iron contains a large amount of chromium, nickel, molybdenum, etc., the carbide precipitated in the outer structure of the roll body when the molten iron solidifies is M 7 C 3 Type eutectic carbide, the hardness can reach 1500-2000HV. [0003] Due to the high rolling speed of the currently used strip tandem mill for finishin...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C22C37/10C22C37/08B22D13/02B22D19/16C21D1/18C21D5/00C21D9/38
CPCB22D13/02B22D19/16C21D1/18C21D5/00C21D9/38C22C37/08C22C37/10
Inventor杨秀霞
OwnerSINOSTEEL XINGTAI MACHINERY & MILL ROLL