title>JB/T 8491.5-1996 Technical conditions for heat treatment of machine tool parts Nitriding and nitrocarburizing - JB/T 8491.5-1996 - Chinese standardNet - bzxz.net
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JB/T 8491.5-1996 Technical conditions for heat treatment of machine tool parts Nitriding and nitrocarburizing
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Standard ID:
JB/T 8491.5-1996
Standard Name: Technical conditions for heat treatment of machine tool parts Nitriding and nitrocarburizing
This standard specifies the technical requirements, inspection methods and acceptance rules for nitriding and nitrocarburizing of metal cutting machine tool parts. This standard is applicable to steel and iron parts treated by gas nitriding, ion nitriding and nitrocarburizing. JB/T 8491.5-1996 Technical conditions for heat treatment of machine tool parts Nitriding and nitrocarburizing JB/T8491.5-1996 Standard download decompression password: www.bzxz.net
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Machinery Industry Standard of the People's Republic of China JB/T8491.5—1996 Technical Conditions for Heat Treatment of Machine Tool Parts Nitriding and Nitrocarburizing Published on November 7, 1996 Mechanical Industry Standard of the People's Republic of China Implementation on January 1, 1997 JB/T8491.5—1996 This standard is formulated on the basis of summarizing many years of production experience in heat treatment of machine tool parts in my country and referring to relevant foreign technical data. It is the replacement of TB/T54219—94 "General Conditions for Heat Treatment of Machine Tool Parts with Nitrogen and Nitrocarburizing". This standard is proposed by the National Technical Committee for Machine Tool Standardization. This standard is under the jurisdiction of Beijing Machine Tool Research Institute of the Ministry of Machinery Industry, and the drafting unit is Beijing Machine Tool Research Institute of the Ministry of Machinery Industry, which was first published in 1994. Standard of the Machinery Industry of the People's Republic of China Technical Conditions for Heat Treatment of Machine Tool Parts Ammonia Carburizing, Ammonia Carbon Co-carburizing JB/T8491.51996 Replacement IB/T42[9—94 This standard specifies the technical requirements for the calculation and nitrogen co-carburizing of the parts before cutting (hereinafter referred to as the parts), the test method and the test specification. This standard is applicable to steel and iron parts treated with gas nitrogen reduction, ion nitrogen and nitrogen carbon co-carburizing. 2 References The provisions contained in the following standards shall constitute the provisions of this standard by using them in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the following new versions: GB -3484 GB 4342$4 8 1135489 3 Appearance quality Metallic electrostatic test method Determination of air layer depth and metallographic inspection of steel parts 3.1 The surface of the parts should be natural gray or white, and there should be no defects such as shearing, bruising and electric burns. 3.2 Inspection by naked eye or low-power human observation 4 Surface hardness After deterioration by ammonia or other means, the product should not be less than the requirements. 4.1 Weak material 2cCrMa 20C-MnTI 35CtMs 38CrtMoAiA Q1600-3 The surface roughness of filter parts after simple carbon co-stabilization shall not be lower than that specified in Table 3. 4.2 Approved by the Ministry of Machine Tool Industry on November 7, 1996 Implementation on January 1, 1997 20CtMa 20CrMnTi QT600-2 JB/T8491.5—1996 Chemical layer 0.D100.025 With certificate For parts made of materials other than this standard, the hardness shall comply with the requirements of the drawings or process documents: 4.3 The hardness of the local anti-seepage part shall not affect the cutting performance and opening performance of the part. 4.4 4.5 The hardness shall be measured on the same part, and the test specimen can also be used when conditions permit. The surface strength of the hydrogen-filled parts shall be measured according to the method specified in GB4340, and the test load shall be 9.8~0RN; the surface strength of the oxygen-carbon co-existing parts shall be measured according to the method specified in GB4342. 5 The brittleness shall be evaluated according to GB4354, with 1-2 levels for main parts and 1~3 levels for non-main parts. The depth of the nitriding layer The depth of the nitriding layer of the finished product shall comply with the assumptions in the selected process documents, and the deviation of the nitriding layer depth is shown in Table 33 The depth of the nitriding layer of the finished product shall not exceed the provisions of Table 4. 62wwW.bzxz.Net The depth of the nitriding layer Note: The company's approval refers to the consistency of the nitriding layer obtained by the same processing of the same material The same method JRT S491.5-1996 6.3 For parts that are no longer subjected to rate cutting after nitriding, the calculated compound layer depth should not exceed 0.mm6.4 The detection depth of the healed layer should comply with the requirements of Table 2. 6.5 The detection depth of the healed layer should be measured on the same treated sample according to the method specified in GB11354. When there is a difference, the part measurement should be carried out. The amide form chloride form should be evaluated according to GB11354. The main parts are qualified for level J~2, and the non-deformed parts are qualified for level [-3]. The carbon deposition test is carried out according to GB11354. The main parts are qualified for level 1-2, the main clean parts are qualified for level 1~3, and the deformation of the parts should comply with the requirements of the net fence or: art cow. Cold correction is not allowed. 10 Acceptance regulations 10.1 The product is qualified if it meets the relevant indicators specified in the technical requirements. 102 Appearance quality, surface hardness, depth of stable layer and deformation development are the necessary inspection items. Each piece should be inspected. The remaining inspection items and batch inspection items can be specified in the technical specifications. Tip: This standard content only shows part of the intercepted content of the complete standard. 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