In the manufacture of chains, in order to ensure the quality of the products, it is necessary to inspect the raw materials of each part and the condition after heat treatment, that is, according to the technical documents of various chain products, process documents, inspection specifications, etc. The national standards of the corresponding steel grades (such as: GB/T 699-1999, GB/T 3077-1999, GB/T 1222-2007, etc.) shall be inspected, and the various inspections and measurements shall be in accordance with the respective countries (industries). The requirements of technical standards are carried out. The following is a brief introduction of national or industry standards for the inspection (inspection) and assessment of some raw materials and heat treatment processes closely related to the production of chain products.
(1) GB/T 25744-2010 "steel carburizing quenching and tempering metallographic test" standard specifies the metallurgical structure of steel carburizing quenching and tempering, metallographic organization level and carburizing quenching effective hardening layer depth The measuring method is suitable for workpieces with an effective hardened layer depth of more than 0.3 mm for steel carburizing and quenching. This is a newly established national standard that was implemented on June 1, 2011. It is the internal metallographic phase of carburized and quenched and tempered parts (such as sleeves, small and medium-sized pins and rollers) in various chain products. An important criterion to follow when organizing inspections.
(2) JB/T 7710-2007 "Thin-layer carbonitriding or thin-layer carburizing steel parts microstructure inspection" standard specifies thin layer carbonitriding or thin layer carburizing steel surface and core microscopy The method for determining the organization rating and the depth of the layer is suitable for parts of low carbon steel and low alloy steel such as 08F, Q215AF, 10, 15, 20, 20Cr, 20CrMnMo with carbonitriding or carburizing layer depth less than or equal to 0.3mm. . In addition to materials such as 10, 20, 20Cr, 20CrMnMo, etc., thin-layer carbonitrided or carburized parts made of ASTM 1018, 20CrMo, 30CrMnTi and other materials in chain production can also be referred to JB/T 7710-2007 standard. Detection of metallographic structure of parts.
(3) GB/T 13299-1991 "Metal Microstructure Evaluation Method" is an important basic standard for the evaluation of steel microstructure, which specifies the free cementite of steel, pearlite of low carbon deformed steel, The metallographic evaluation method, evaluation principle and organization characteristics of the band structure and Wei's structure; the standard is applicable to the microstructure evaluation of steel sheets, steel strips and profiles of low carbon and medium carbon steel; other steel grades are based on relevant standards or The agreement can also be assessed by reference to the relevant provisions of the standard.
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