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Rare earth alloyed steel, nitriding method thereof and nitrided steel part

A technology of rare earth alloy and nitriding steel, which is applied in the coating process of metal materials, coating, and gas emission reduction, and can solve the problems of equipment pollution, corrosion, and limited penetration depth.

Pending Publication Date: 2022-02-01
XIAN FASHITE AUTOMOBILE TRANSMISSION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the existing technology has the infiltration effect, it needs to be improved in terms of equipment and operation, and the rare earth infiltration agent will cause certain pollution and corrosion to the equipment, and the depth of the infiltration layer is limited

Method used

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  • Rare earth alloyed steel, nitriding method thereof and nitrided steel part
  • Rare earth alloyed steel, nitriding method thereof and nitrided steel part
  • Rare earth alloyed steel, nitriding method thereof and nitrided steel part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Rare earth alloyed steel smelting 42CrMo to as matrix material, the chemical components and their contents are: C was 0.37wt%, Si is 0.15wt%, Mn was 0.65wt%, Cr was 0.85wt%, Mo is 0.15wt%, Ni was 0.25wt%, P was 0.025wt%, S of 0.015 wt% rare earth alloy is added in the smelting process, in which the mass percentage of the rare earth alloy is wt: 0.01%, balance iron and impurities . The rare earth alloy comprising a mass fraction of 50% Ce, 29% of La, 5% and 16% of Pr Nd. The rare earth alloy of the surface of the iron atoms in the steel making energy prices, increasing the driving force to capture the N atom, so that the diffusion coefficient increases, the diffusion rate up, nitridation process period is shortened; while the steel material in the smelting process since rare earth alloy was added, the activity of high rare earth element is added, may be mixed with an Al 2 O 3 The reaction MnS sulfides and achieve deoxidizing steel desulfurization, such as figure 1 As shown i...

Embodiment 2

[0045] A rare earth alloying steel, a smelting of 42 Crmo as a matrix, including 0.33 wt% C, 0.17 wt% Si, 0.72 wt% Mn, 0.95 wt% of Cr, 0.19 wt% MO, 0.23 wt% Ni, 0.022 wt% of P, 0.018 wt% of S, 0.022 wt% of the rare earth alloy, the balance iron and impurities. The rare earth alloy comprises a mass fraction of 50% CE, 29% La, 5% Pr and 16% Nd.

[0046] The following righteous alloying steel is carried out using the following steps:

[0047] S1: Forging. The above-mentioned rare earth alloyed steel was heated to 1080 ° C, and 3500 tons of electric hammers forged, and the three-dimensional, molded, punching and other steps can be forged as the various types of parts required for the required model;

[0048] S2: orthogonal. The part blank of the completion step S1 was heated to 660 ° C, heat insulation for 4 h, cooled to 200 ° C, cooled, cooled in air;

[0049] S3: Roughing. Rough processing of the blank in step S2, including the outer circle and end faces or the like;

[0050] S4: Tr...

Embodiment 3

[0055] A rare earth alloying steel, smelting with 42 Crmo as a matrix, including 0.35 wt% C, 0.25 wt% Si, 0.84 wt% Mn, 1.05 wt% Cr, 0.22 wt% MO, 0.2% by weight Ni, 0.023 wt% of P, 0.019 wt% of S, 0.03 wt% of rare earth alloy, the balance iron and impurities. The rare earth alloy comprises a mass fraction of 50% CE, 29% La, 5% Pr and 16% Nd.

[0056] The following righteous alloying steel is carried out using the following steps:

[0057] S1: Forging. The above-mentioned rare earth alloyed steel was heated to 1150 ° C, and the three-ton, molded, punching, etc., after the three-tenthohydrotic, molded, punching, etc., can be forged as the various types of parts required for the required model;

[0058] S2: orthogonal. The part blank of the completion step S1 was heated to 710 ° C, heat insulation for 4 h, cooled to 200 ° C, baked, cooled in air;

[0059] S3: Roughing. Rough processing of the blank in step S2, including the outer circle and end faces or the like;

[0060] S4: Treatmen...

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Abstract

The invention relates to a rare earth alloyed steel, which comprises the following components in percentage by mass: 0.37 to 0.44 weight percent of C, 0.15 to 0.35 weight percent of Si, 0.65 to 1.00 weight percent of Mn, 0.85 to 1.25 weight percent of Cr, 0.15 to 0.25 weight percent of Mo, 0.015 to 0.025 weight percent of S, Ni, P and rare earth alloy, and the balance of iron and impurities, the mass percentage content of Ni is not greater than 0.25%, and the mass percentage content of P is not greater than 0.025%; and the mass percentage content wt of the rare earth alloy is more than 0 and not more than 0.06%. The steel is low in content of low-melting-point impurities, good in fatigue resistance and good in impact toughness. The nitriding method of the steel comprises the steps that the steel is heated to 1050-1250 DEG C, forging, heating, heat preservation, rough machining and heat treatment are conducted, finish machining is conducted, and then nitriding is conducted. The obtained nitrided steel part has good surface hardness, the depth of a hardened layer is appropriate, and the steel part has excellent abrasive resistance and corrosion resistance.

Description

Technical field [0001] The present invention belongs to the field of metal materials, steel, and relates to a method of nitriding a rare earth alloy of the workpiece, and one nitriding. Background technique [0002] Nitriding thermal treatment is a widely used steel surface chemical treatment techniques, which aim is to achieve a nitrogen-enriched surface layer of a steel material in, and reacts to form a hardened layer to improve the wear resistance and fatigue strength of steel. Nitriding steel to improve the penetration of nitrogen atoms in the nitrogen content in the steel surface ferritic state (700 deg.] C or less), due to the low temperature, the diffusion rate of the nitrogen atoms in the ferrite is much lower than the diffusion of nitrogen in austenite speed, thereby nitriding slow, energy consumption, long production cycle, the auxiliary time if included, is generally a long process time of several tens of hours. This will waste a lot of work, power consumption and nitr...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C23C8/26C22C33/06C23F17/00C21C7/06C21C7/064C21D6/00
CPCC22C38/02C22C38/04C22C38/44C22C38/005C23C8/26C22C33/06C23F17/00C21C7/06C21C7/064C21D6/004C21D6/005C21D6/008Y02P10/143
Inventor 桂伟民严鉴铂刘义何亮亮张晓菊王元栋海侠女
Owner XIAN FASHITE AUTOMOBILE TRANSMISSION CO LTD
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