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30CrNi3A material isothermal hardening technique
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A technology of isothermal quenching and 1.30crni3a, which is applied in the direction of manufacturing tools, heat treatment equipment, heat treatment process control, etc., can solve the problems of high product hardness and poor machining performance, and achieve the effect of improving mechanical properties, reducing processing costs, and reducing costs
Inactive Publication Date: 2010-12-08
CHONGQING JIANSHE IND GRP
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[0004] In order to overcome the shortcomings of high hardness and poor machinability of the product obtained by the graded quenching heat treatment process of 30CrNi3A material in the prior art, the present invention provides a new process for austempering the material
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Embodiment 1
[0027] 1.1 Heat treatment process parameters:
[0028] Quenching heating equipment: 35KW pit type electric furnace
[0046] Quenching cooling medium temperature: 280°C, quenching cooling time: 40min
[0047] 3.2 Hardness value (hardness value of 6 parts tested): 45.5, 46.5, 45.0, 45.5, 46.0, 46.0
[0048] Average hardness: 45.7500HRC
[0049] After a total of 10,000 times (normal temperature, low temperature) life test, service use strength test and drop performance test of the product. At the end of the test, no cracks were found in the magnetization flaw detection of the physical parts of the XXX model gun family, which met the product design life requirements.
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Abstract
The present invention discloses a 30CrNi3A isothermal quenching heat treatment process. It is characterized by that its quenchingheating temperature is 850-900deg.C, quenchingheating time is 30-60min and quenching cooling time is 30-60min. In order to obtain the workpiece whose hardness value is 45-48 HRC its correspondent isothermal cooling medium temperature range is 240-285deg.C.
Description
technical field [0001] The invention relates to a heat treatment process for austempering a material, in particular to a process for austempering a 30CrNi3A material. technical background [0002] In the field of firearms, heat treatment is required for important parts, including austempering heat treatment, to improve the mechanical properties of parts, such as increasing strength, increasing hardness, improving impacttoughness, improving processing performance, etc.; reasonable and appropriate austempering Heat treatment process parameters have a decisive influence on the mechanical properties of parts. [0003] In the prior art, the physical parts (material: 30CrNi3A technical specification: (45-50) HRC) for a certain type of gun family products adopt martensitic step-by-step quenching process (salt bath furnace heating, nitratesalt bath (180-240) Quenching and cooling at ℃, tempering in nitrate furnace (180~240)℃, the structure is tempered martensite) for heat treatme...
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