scope:

This Standard specifies the appearance, shapes and permissible variations thereof, and the dimensions, mass and their tolerances of hot rolled steel sections (hereafter, referred to as "steel sections").

The application of this Standard is specified in respective product standards.

NOTE: The International Standards corresponding to this Standard and the symbol of degree of correspondence are as follows:

ISO 657-1: 1989 Hot-rolled steel sections-Part 1: Equal-leg angles-Dimensions

ISO 657-2: 1989 Hot-rolled steel sections-Part 2: Unequal-leg anglesDimensions

ISO 657-5: 1976 Hot-rolled steel sections-Part 5: Equal-leg angles and unequal-leg angles-Tolerances for metric and inch series

ISO 657-11: 1980 Hot-rolled steel sections-Part 11: Sloping fiange channel sections (Metric series}-Dimensions and sectional properties

ISO 657-15: 1980 Hot-rolled steel sections-Part 15: Sloping fiange beam sections (Metric series}-Dimensions and sectional properties

ISO 657-16: 1980 Hot-rolled steel sections-Part 16: Sloping fiange column sections (metric series}-Dimensions and sectional properties

ISO 657-18: 1980 Hot-rolled steel sections-Part 18: L sections for shipbuilding (metric series}-Dimensions, sectional properties and tolerances

ISO 657-19: 1980 Hot-rolled steel sections-Part 19: Bulb fiats (metric series}- Dimensions, sectional properties and tolerances

ISO 657-21: 1983 Hot-rolled steel sections-Part 21: T-sections with equal depth and fiange width-Dimensions (overall evaluation: MOD)

The symbols which denote the degree of correspondence in the contents between the relevant International Standards and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21-1.