SWRM15K · JIS G 3505-2017
Mild-steel wire rod; specified killed-steel designation K · Clause5/Table1 and AnnexJA.1-JA.3 · PDF page 5、6、8 · Mass fraction %
| Element | Heat analysis / guide composition |
|---|---|
| C | 0.13～0.18 |
| Mn | 0.3～0.6 |
| P | ≤0.04 |
| S | ≤0.04 |
Verify against the actual Japanese original Table 1 and normative Annex JA of JIS G3505:2017; heat analysis mass fraction wt%. The standard applies to mild steel wire rod for further processing into products such as iron wire and galvanized iron wire; electrode core wire rod is excluded.; Not automatically equivalent to special cold-heading steel. C and Mn for SWRM6/8 have only upper limits; unspecified lower limits shall not be added; Si and elements not listed in the table shall not be entered as 0; they shall not be intentionally added except for the purpose of finishing steelmaking; B addition by agreement shall follow JA.3. Add K to the end of the grade when killed steel is specified; K denotes deoxidation conditions; do not independently prescribe Al or Si content.. SWRM2/4 shall be adopted only per JA.1 agreement; SWRM17M/20M shall only have Mn changed to 0.60—0.90% per JA.2 agreement; the Mn range for ordinary 17/20 shall not be automatically expanded. When B is added per JA.3 agreement, B ≤ 70ppm, i.e., 0.007wt%; B content and B/N must be reported simultaneously. B/N for 2/4/6/8/10/12 is 0.4—1.8, and for 15/17/20/22 is 0.4—0.9. Compliance with the agreed conditions shall not be determined solely by satisfying the B upper limit; this upper limit shall not be applied if B is not agreed. The current composition table shows the default range without B addition; Agreed B/N must be verified separately in conjunction with the actual measured values of B and N for the heat; unspecified values for N shall not be entered as 0, nor shall B-suffix grades without original text basis be generated. Standard nominal diameters include 6.4mm; do not erroneously enter 6.5mm; Tolerances and diameter deviations for diameters > 25mm shall be per agreement; stricter precision per JA.4 must be separately agreed.
Original source: JIS G 3505:2017
Illustrative packaging
Illustrative company wire products and packaging; the images do not identify the listed grade’s heat or batch, current stock, or default delivery conditions.