ISO TS 4949:2016 pdf free
ISO TS 4949:2016 pdf free.Steel names based on letter symbols
The coding shall comprise successively the following symbols.
a) A number being 100 x the specified average percentage carbon content. Where the carbon content is not specified by a range the subcommittee responsible for the relevant product standard shall select a suitably representative value.
NOTE To distinguish between two similar steel grades, the number indicating carbon content can be increased or decreased by one unit.
b) Chemical symbols indicating the alloying elements that characterize the steel. The sequence of symbols shall be in decreasing order of the value of their content; where the values of contents are the same for two or more elements, the corresponding symbols shall be indicated in alphabetical order.
c) Numbers indicating the values of contents of alloy elerments. Each number represents the average percentage content of the element indicated multiplied by the factors given in Table 1 and rounded to the nearest integer. The numbers referring to the different elements shall be separated by hyphens.However, in order to follow the principle of keeping names as short as practical, one or more of these digits may be omitted as long as there is no danger of confusion with a similar grade.
The coding shall comprise successively the following symbols.
a) The letter X.
b) A number being 100 x the specified average percentage carbon content. Where the carbon content is not specified by a range the subcommittee responsible for the relevant product standard shall select a suitably representative value.
NOTE To distinguish between two similar steel grades, the number indicating carbon content can be increased or decreased by one unit.
c) Chemical symbols indicating the alloying elements that characterize the steel. The sequence of symbols shall be in decreasing order of the value of their content; where the values of contents are the same for two or more elements, the corresponding symbols shall be indicated in alphabetical order.
d) Numbers indicating the values of contents of alloying elements. Each number represents the average percentage content of the element indicated rounded to the nearest integer. The numbers referring to the different elements shall be separated by hyphens.ISO TS 4949 pdf free.
