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An improved high chromium ferroroller with tungsten modification treatment

A metamorphic treatment and improved technology, which is applied in the field of rolls, can solve the problems of not being able to meet the requirements of the front section of the hot-strip tandem rolling mill, so as to improve the hardness and mechanical properties, improve the metallurgical quality and purity, and improve the hardness and wear resistance. Effect

Active Publication Date: 2021-01-08
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing high chromium iron rolls can no longer meet the requirements of the front section of finishing rolling in hot strip tandem mills

Method used

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  • An improved high chromium ferroroller with tungsten modification treatment
  • An improved high chromium ferroroller with tungsten modification treatment
  • An improved high chromium ferroroller with tungsten modification treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A. Melting: The chemical composition and mass percentage of the working layer of the roll are C2.30~3.00%, Si0.40~1.20%, Mn0.40~1.20%, Cr13.00~20.00%, W2.00~ 6.50%, Mo0.80~2.00%, V0.05~1.00%, S≤0.03%, P≤0.03%, the rest are Fe and unavoidable impurities;

[0034] Pig iron and scrap steel are used as the base material during batching, and the batching is done according to the above chemical composition. Wherein, all of W is added in the form of a tungsten modifier, and after the molten iron smelting is completed, the tungsten modifier is evenly rushed into the ladle together with the molten iron flow out of the furnace. The molten iron in the working layer is initially smelted in the intermediate frequency induction furnace by the oxidation method, and then refined outside the furnace. The melting and refining temperature of the intermediate frequency induction furnace is 1400 °C;

[0035] B. Modification treatment: when the molten iron comes out of the furnace, add the ...

Embodiment 2～4

[0042] Examples 2-4 have the same manufacturing method as the above-mentioned Example 1, but the different process parameters are shown in Table 1 below.

[0043] Table 1

[0044]

[0045] After testing, the chemical composition, mass percentage and hardness of the roll working layer finally prepared in each embodiment are shown in Table 2, and the metallographic structure is as follows figure 2 , image 3 , Figure 4 shown.

[0046] Table 2

[0047] Example 2 Example 3 Example 4 C (wt%) 2.30 2.40 3.00 Si(wt%) 0.40 1.10 1.20 Mn(wt%) 0.40 0.80 1.20 Cr(wt%) 13.00 17.40 20.00 W (wt%) 2.00 5.20 6.50 Mo (wt%) 0.80 1.10 2.00 V(wt%) 0.05 0.60 1.00 S (wt%) 0.016 0.028 0.012 P (wt%) 0.02 0.024 0.018 Hardness (HSC) 80～83 81～84 82～86

Embodiment 5

[0049] Example 5 is a comparative example, no tungsten modifier is added during manufacture, and tungsten is added in proportion to the ingredients during smelting, and the rest are 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.

[0050] table 3

[0051]

[0052]

[0053] It can be seen from Table 3 that the wear resistance of the roll treated with tungsten modification is greatly improved, and the thermal cracking resistance and impact toughness are significantly improved compared with the roll without tungsten modification treatment.

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Abstract

The invention discloses an improved high-chromium iron roller for tungsten modification treatment, and particularly relates to a roller used for forepart work of finish rolling of a hot-strip continuous rolling mill. A working layer of the roller comprises the chemical components, by mass percentage, 2.30-3.00% of C, 0.40-1.20% of Si, 0.40-1.20% of Mn, 13.00-20.00% of Cr, 2.00-6.50% of W, 0.80-2.00% of Mo, 0.05-1.00% of V, less than or equal to 0.03% of S, less than or equal to 0.03% of P, and the balance Fe and inevitable impurities, wherein the W is partially or completely added through a tungsten modifier. According to the improved high-chromium iron roller, a treatment technology of the tungsten modifier is added, and therefore the hardness and the mechanical property of the roller canbe improved, and the impact toughness and the high-temperature wear resistance of the roller can be improved.

Description

technical field [0001] The invention relates to a roll, in particular to an improved high-chromium iron roll, which is used for the front-stage work roll of a hot-strip continuous 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 all kinds of alloy cast iron rolls, with the solidification of molten iron, the carbides precipitated in the outer layer (working layer) of the roll body are 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, therefore, the high-chromium iron roll h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/06C22C37/10C22C37/04C22C33/08C22C32/00C21C7/00C21D1/18C21D5/04
CPCC21C7/0068C21D1/18C21D5/04C21D2211/008C22C32/0052C22C33/08C22C37/04C22C37/06C22C37/10Y02P10/20
Inventor 尹秀芳
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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