Rare earth modification and ageing processing method of high chromium-nickel alloy steel guide plate

A technology for the modification of nickel alloy steel and rare earth, applied in the field of metallurgy, can solve the problems affecting the quality of steel pipes, scratches on the surface of steel pipes, poor wear resistance and thermal crack resistance, etc., and achieves the effect of reducing costs and saving steel

Active Publication Date: 2013-04-10
INNER MONGOLIA BAOTOU STEEL UNION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the experimental results, the guide plate with too high nickel content is likely to stick to steel during use and cause scratches on the steel pipe surface, thus affecting the quality of the steel pipe, while the guide plate with too low nickel content is low in cost, but its wear resistance and heat resistance are low. Poor crack performance
This patent only discloses the chemical composition of the guide plate of the piercer, and does not involve the heat treatment process under the corresponding composition

Method used

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  • Rare earth modification and ageing processing method of high chromium-nickel alloy steel guide plate
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  • Rare earth modification and ageing processing method of high chromium-nickel alloy steel guide plate

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Experimental program
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Embodiment 1

[0027] A 1 ton intermediate frequency furnace is used to smelt two furnaces of high-chromium-nickel alloy steel, one furnace is modified by adding 0.01% rare earth, and the other furnace does not add rare earth. When the smelting temperature reaches 1600°C, the steel is deoxidized by inserting aluminum, and then cast, and its chemical composition and content (% by weight) are: C 1.4, Si 0.5, Mn 1.1, P 0.01, S 0.02, Si 0.6, Cr 26, Ni 9, Mo 0.6, RE 0.01, balance Fe and undetectable trace elements. When the molten steel reaches 1 / 3, adopt the input method to input 50% of the total amount of rare earth wire added, and when the molten steel reaches 2 / 3, put in another 50% of the rare earth wire; after tapping, the ladle is still for 20 minutes. Pour molten steel at a suitable temperature into the ladle, pour it into the dried sand box after stirring, and cast the sample blank. The as-cast samples were processed into 10mm×10mm×55mm unnotched impact samples for impact energy and har...

Embodiment 2

[0029] Smelting, casting process are the same as embodiment 1.

[0030]After machining the as-cast guide plate that has not undergone rare earth modification treatment, it is subjected to normalizing treatment in a gas furnace. The normalizing treatment process is: heating to 1080° C. for 30 minutes, and then leaving the furnace to cool in air. The as-cast sample after the modification treatment was heated to 480°C for 8 hours, 530°C for 8 hours, and 580°C for 8 hours for aging treatment. Sampling after normalizing and aging treatment, grinding and polishing with FeCl 3 Solution corrosion, observe its metallographic structure. Process the heat-treated sample into a 10mm×10mm×55mm unnotched impact sample, and measure the hardness after measuring the impact value. The sample was tested by FeCl 3 Solution and aqua regia corrosion, using NEOPHOT 32 optical microscope and EVO HV50 scanning electron microscope to observe the carbide morphology and grinding surface characteristics...

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Abstract

The invention discloses a rare earth modification and ageing processing method of a high chromium-nickel alloy steel guide plate, belonging to the technical field of metallurgy. The rare earth modification and ageing processing method comprises the following steps of: enabling large blocky net primary carbides to be subjected to necking and spheroidizing through a rare earth modification process;and separating out secondary carbides after an ageing process in tiny dispersive small particles instead of a plurality of thick strips. Due to the change of size, form and amount of the primary carbides and the secondary carbides, the service life of the high chromium-nickel alloy steel guide plate is prolonged. After modification and ageing processes are carried out on the guide plate, the original fragmentation situation is largely reduced, the service life is prolonged by 43-50%, the service life of small series guide plate is prolonged to 1000 times per piece from the original average 700 times per piece, the service life of a large series guide plate is prolonged to 1500 times per piece from the original average 700 times per piece, the energy consumption per ton steel is reduced, and the production cost is saved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a rare earth modification and aging treatment method for high-alloy steel. Background technique [0002] High-chromium-nickel alloy steel is used as the inlet guide plate of the continuous rolling steel pipe unit, and the phenomenon of steel sticking, fatigue cracks and fractures occurs in advance during use, resulting in early scrapping or initial network cracks during use, and crack propagation occurs under harsh service conditions lead to breakage. After anatomical analysis, the main problem is that the organizational structure of the guide plate is unreasonable, and the primary carbides in the tissue are connected into a network, which causes the service life of the guide plate to decrease. From the as-cast solidification characteristics of high-chromium-nickel alloy steel, due to the segregation of alloy elements such as C and Cr, the molten steel pool between austenite den...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C33/04
Inventor 冯岩青高志国康利明
Owner INNER MONGOLIA BAOTOU STEEL UNION
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