SWRM20M
1 source records. Standards, editions and conditions are presented separately; matching grade names do not establish interchangeability.
Refer to each source for mass fractions and analysis type. Missing values are not treated as 0. Manufacturer typical values, standard guarantees and measured heat results must remain separate. Use the material selector for calculations and condition selection.
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SWRM20M · JIS G 3505-2017
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Carbon steel
- Subcategory
- Carbon steel
- Material form
- Mild-steel wire rod; high-Mn designation M by agreement
- Original record status
- Original standard verified
- Standard edition
- JIS G 3505:2017
- Table / clause
- Clause5/Table1 and AnnexJA.1-JA.3
- PDF page references
- 5、6、8
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.18 ～ 0.23 |
| Mn | 0.6 ～ 0.9 |
| P | ≤ 0.04 (lower limit not stated) |
| S | ≤ 0.04 (lower limit not stated) |
Applicability and limitations
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. This item contains agreement conditions for normative annexes, which must be explicitly adopted in the order; Not a default delivery guarantee.