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A kind of low-carbon steel parts and composite heat treatment method thereof

A composite heat treatment and low-carbon steel technology, applied in metal material coating technology, coating, solid-state diffusion coating, etc., can solve the problems of small deformation and deformation, and achieve the effects of reducing deformation, improving deformation and increasing carbon concentration Effect

Active Publication Date: 2018-09-11
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem of severe deformation of existing low-carbon steel after heat treatment, the present invention provides a low-carbon steel part with small deformation after heat treatment and its composite heat treatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The material is DC01 clutch damping disc of a certain type, the thickness of the sheet is 2mm, stamped, the outer diameter is 196mm, the inner diameter is 180mm, the surface hardness is required to be ≥550HV0.2, and the flatness is ≤0.15mm.

[0033] (1) Prepare the cold-rolled steel plate of DC01, and obtain the required parts through punching and stamping processes;

[0034] (2) Put the parts into a multi-purpose furnace with a cooling chamber for heating. During the whole heating process, methanol and pure nitrogen are used for protection, and the positive pressure in the furnace is maintained to prevent the surface oxidation of the parts. When the temperature in the furnace rises to 850 ° C, keep it for 10 minutes ;

[0035] (3) Introduce propane and ammonia gas accounting for 4% of the total volume of the gas for carbonitriding, the carbon potential is set at 1%, and the process time is 120 minutes;

[0036] (4) After nitriding and co-carburizing, transfer the part...

Embodiment 2

[0042] A certain double clutch inner bracket is made of DC04 deep-drawn steel with a wall thickness of 2mm and deep-drawn. The diameter of the outer circle is 161mm, the diameter of the inner hole is 59mm, the flatness requirement is ≤0.12mm, the coaxiality requirement of the outer circle relative to the inner hole is ≤0.1mm, and the surface hardness requirement is ≥500HV0.2.

[0043] (1) Prepare the cold-rolled steel plate of DC04, and obtain the parts we need through the punching and deep-drawing process;

[0044] (2) Put the parts into a multi-purpose furnace with a cooling chamber for heating. During the whole heating process, methanol and pure nitrogen are used for protection, and the positive pressure in the furnace is maintained to prevent the surface oxidation of the parts. When the temperature in the furnace rises to 860 ° C, keep it for 10 minutes ;

[0045] (3) Introduce propane and ammonia gas accounting for 4% of the total volume of the gas for carbonitriding, th...

Embodiment 3

[0052] The material is the SPCC vending machine lock cover plate, the wall thickness is 3mm, stamped and formed, the surface hardness requirement is ≥600HV0.2, and the outer surface warpage is ≤0.08mm.

[0053] (1) Prepare the cold-rolled steel plate with SPCC as the material, and obtain the required parts through punching and stamping processes;

[0054] (2) Put the parts into a multi-purpose furnace with a cooling chamber for heating. During the whole heating process, methanol and pure nitrogen are used for protection, and the positive pressure in the furnace is maintained to prevent the surface oxidation of the parts. When the temperature in the furnace rises to 870 ° C, keep it for 20 minutes ;

[0055] (3) Introduce propane and ammonia gas accounting for 4% of the total volume of the gas for carbonitriding, set the carbon potential to 1.05%, and process time for 60 minutes;

[0056] (4) After nitriding and co-carburizing, transfer the parts from the heating chamber to th...

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Abstract

The invention provides a low carbon steel part and a composite heat treatment method thereof. The method comprises the following steps: carbonitriding the low carbon steel part, carrying out machining shaping, and nitriding. The low carbon steel processed by the method has the advantages of required surface hardness reaching, small flatness, small deflection, and meeting of present requirements of the deflection.

Description

technical field [0001] The invention belongs to the field of low-carbon steel, and in particular relates to a low-carbon steel part and a composite heat treatment method thereof. Background technique [0002] For thin-walled cold-rolled steel parts with a carbon content of ≤0.12%, the forming method is generally stamping or deep drawing, and the shape is relatively complicated. For some such parts used in mechanical mechanisms or equipment, precise dimensions are required for Final assembly, and good surface hardness to improve its overall strength and wear resistance to meet the needs of the work. For these low-carbon steel thin-walled parts, the surface hardness is generally improved by carburizing or carbonitriding and then quenching, but the phase transformation stress of austenite to martensite transformation caused by high temperature quenching and the thermal stress caused by supercooling All will cause serious deformation of the parts, unable to meet the deformation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/34
Inventor 唐志刚
Owner BYD CO LTD
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