GB 2975 - 82 Specification for Sampling and Testing of Mechanical and Process Properties of Steel GB 2975 - 82 is a national standard for sampling and testing of steel for selection and identification purposes. This standard covers the various methods for sampling and testing steel properties related to shape, structure, and physical properties.
The standard is divided into two parts: Part I covers steel sampling and Part II covers steel testing. Sampling is the process of selecting pieces of steel that comprise an entire shipment in order to assess the quality and integrity of the material. Testing then takes place to make sure that the correct steel material is being used.
In Part I, the size of the sample is determined based on the quantity and quality of the steel being tested. This section also addresses the methods of finding a definite sample size for the steel. Two common sampling methodologies according to the standard are based on batch sampling and random sampling. Batches of steel pieces in the shipment should be sampled according to batch numbers. Steel pieces within a batch should then be randomly sampled. Alternatively, if all steel pieces within the batch are deemed to be of the same quality and composition, a batch selection can be made.
Part II of the standard addresses the methods of testing steel properties. This section covers tests related to the steel’s mechanical, chemical, and metallurgical properties such as tensile strength and Brinell hardness. Test specimens must then be inspected to check if they conform to the required material specifications.
In conclusion, the objective of the GB 2975 - 82 standard is to provide guidance for sampling and testing of steel for selection and identification purposes. The various methods for steel sampling and testing covered in the standard have been developed to ensure the quality and integrity of steel materials used in industrial and engineering applications.
