This Standard specifies the principle, definitions, symbols and designations, test piece and its dimension measurement, testing apparatus, conditions of testing, property determination, rounding off of numerical values of determination results, and test report for tensile testing of metallic materials. This Standard applies to determination of tensile properties of metallic materials at ambient temperature. Whereas, the tensile testing for the metallic products with a small cross section dimension such as metal anchors, ultra-fine wires and capillary tubes requires separate agreement.

This part of GB/T 228 specifies the principle, definition, symbols, explanation, test piece and dimensional measurement, testing equipment, testing requirements, performance determination, the numerical rounding of determination results and testing report of the method for tensile testing of metallic materials.

This Standard specifies the primary, secondary, and fifth sampling plans and sampling procedures based on the rejection quality level (expressed as the percentage of rejected products or the number of rejected products per hundred units) as the quality indicator. It is applicable to the inspection for process stability.

This Standard specifies a method of determining the grammage of paper and board. This Standard applies to various papers and boards.

This Standard specifies the method of using the hand-feeling softness tester to determine the softness of paper. This Standard is applicable to various wrinkle toilet paper, tissue paper and its derivatives, as well as other papers that require softness.

This Part specifies the principle, reagents and materials, instruments, sampling and sample preparation, analytical procedures, result calculation, etc. of using potassium dichromate titrimetric method and 1,10-phenanthroline spectrophotometric method to determine the total iron content.

This Standard specifies the order contents, dimension, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of the high-carbon chromium bearing steel.