I recognize that the precise notation of hard drawn steel wire A, B, C are SW-A, SW-B, SW-C, but I often also see the notation SWC, SWB, SWC. In particular, when there are carbon contents such as 40C, 60C, 80C, almost no “-” is written. So, when writing 40C, 60C, 80C, is it correct not to write “-” after SW?
If 40C, 60C, 80C are not written, isn’t it a common to simply write the notation of “-” after SW? Or are both notations correct?
Due to the difference in tensile strength, the symbols for hard drawn steel wire (JIS G3521) are SW-A, SW-B, and SW-C.
Hard drawn steel wire is a material obtained by heat-treating a hard drawn steel wire (JIS G3506) and then cold working.
Since the hard drawn steel wire C type SW-C uses hard drawn steel wire rods SWRH77~SWRH82, it is generally known as 80C in carbon content.
