SWRH67A · High-carbon steel wire rod

SWRH67A · JIS G 3506-2024

High-carbon steel wire rod; see applicable further-processing and delivery-by-agreement conditions · Clause 4/Table 1; Clause 6/Table 2 and note; Annex JA.1 · PDF page 1、5、6、7、11 · Mass fraction %

Based on the official Japanese original text of Tables 1/2 and Normative Annex JA of JIS G3506:2024; Heat analysis, mass fraction wt%. Applicable to wire rod intended for further processing into hard-drawn steel wire, oil-quenched and tempered steel wire, prestressed concrete steel wire, galvanized steel strand, steel wire rope, etc.; This standard does not include wire rod for piano wire and wire rod for bridge cables. Cannot be automatically regarded as applicable for cold heading or as a supply guarantee by the company. The default chemical ranges in Table 2 are separate from the narrowed C ranges in JA.1 adopted only by agreement between supplier and purchaser: the upper and lower limits of the agreed range are narrowed inward by 0.01 percentage points each, and are not adopted automatically by default. Alloying elements not listed in Table 2 shall not be intentionally added except for the purpose of finishing steelmaking; Unspecified values shall not be filled as zero, nor shall the complete carbon equivalent be calculated based on this. Clause 9 generally does not specify fixed mechanical properties. Verification shall be performed according to JA.3/JA.4 only when a target tensile strength has been agreed upon and the corresponding agreed delivery condition is adopted; The ±100/±120MPa in Table JA.1 are allowable deviations around the agreed target, not the absolute Rm range, nor a substitute for the target value. Clause 7.1 specifies an average total decarburization layer depth ≤0.20mm; JA.2 may be tightened to ≤0.15mm by agreement. Average total decarburization depth is not the maximum depth of a single field of view; whether to adopt the agreed value must be confirmed separately. Austenitic grain size and non-metallic inclusion limits must be specified by the purchaser and confirmed by agreement under 7.2; a rating cannot be assigned automatically from the grade alone. Table 3 standard diameters are 5.5, 6, 6.4, 7, 8, 9, 9.5, 10, 11, 12, 13, 14, 15mm; Table 4: for diameters ≤15mm, the tolerance is ±0.40mm and the out-of-roundness is ≤0.64mm; For >15mm, agreement is required; do not extrapolate. Inspection, sampling, dimensions, surface, and other product standard conditions shall be verified separately; The relationship with the ISO 16120 series is one of modified adoption, which does not equate to automatic interchangeability of grades.

Original source: JIS G 3506:2024