GB/T 702-1986 Hot Rolled Rounds and Squares Steel Dimensions, Shapes, Weights and Permissible Variations
This standard specifies the size and shape, permissible asperities and permissible deviations of hot rolled circles and squares for general structural purposes. This standard applies to round and square steels with a nominal diameter or side length of 10 to 200mm.
Size of hot roll round and square steel is generally represented by thickness or diameter, and provided with the specifications of thickness, size and permissible asperities. Generally, the deviations of thickness values shall be specified within each grade from the nominal thickness value.
Shape of hot roll round and square steel is generally represented using circle or square. Permissible variations include roundness, corner angle, face-angle, parallelism and flatness in hot rolled circles and squares.
Weight of hot roll round and square steel is calculating by length, thickness and cross sectional area.
Finally, permissible variations shall be specified in this standard. Permissible variations of hot rolled circles and squares are generally specified as plus and minus by tolerance.
In conclusion, GB/T 702-1986 Hot Rolled Rounds and Squares Steel Dimensions, Shapes, Weights and Permissible Variations standard specifies the size and shape, permissible asperities and permissible deviations of hot rolled circles and squares for general structural purposes. It applies to round and square steels with a nominal diameter or side length of 10 to 200mm and provides values for weight, size and shape deviations from the nominal quality standards. The standard also specifies permissible variations for roundness, corner angle, face angle, parallelism and flatness. These deviation limits can help ensure that all rolled circles and squares meet company and industry standards for quality.
