Many suppliers claim “JIS equivalent.” By referencing the actual JIS G3539 PDF, you can reject materials that do not meet the exact specifications.

: Carbon (C) 0.13%–0.18%, Manganese (Mn) 0.30%–0.60%, and Aluminium (Al) min 0.020%. Mechanical Properties Tensile Strength : Varies by grade, typically ranging from 290 MPa min for softer grades like SWCH 8R to 340 MPa min for harder grades like SWCH 15A. : Standards often require a Reduction of Area of at least

: Defines limits for carbon, manganese, phosphorus, and sulfur to ensure forgeability. Mechanical Properties

| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | |-------|-------|--------|--------|-------|-------| | SWRCH6A | ≤0.08 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH8A | ≤0.10 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH10A | 0.08–0.13 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH12A | 0.10–0.15 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH15A | 0.13–0.18 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH17A | 0.15–0.20 | ≤0.10 | 0.30–0.60 | ≤0.030 | ≤0.030 | | SWRCH18A | 0.15–0.20 | ≤0.10 | 0.60–0.90 | ≤0.030 | ≤0.030 | | SWRCH22A | 0.18–0.23 | ≤0.10 | 0.70–1.00 | ≤0.030 | ≤0.030 |