| Feature | JIS H4100 | ASTM B221 (USA) | EN 755 (Europe) | | :--- | :--- | :--- | :--- | | Alloy System | 4-digit (e.g., 6063) | 4-digit (same, but different tolerances) | EN AW-6063 | | Temper Designations | O, H112, T5, T6 | O, F, T4, T5, T6 | O, H111, T4, T5, T6 | | Tolerance Classes | Very strict (suitable for precision extrusions) | General | General | | Corrosion Testing | Mandatory for certain alloys | Optional | Required for specific applications |
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This level of control is essential; if a material's chemical composition falls outside these strict ranges, it may not achieve the design strength or corrosion resistance required for safety-critical applications.
The JIS H4100 standard requires products to undergo various inspections and tests to ensure compliance with the standard. These include:
For instance, a 6061-T6 extruded bar under JIS H4100 must meet a minimum tensile strength of 265 MPa, compared to 310 MPa for the stronger 7075-T6 alloy.
This standard applies to cross-sections not already covered by specific standards like JIS H 4040 (bars and wires) or JIS H 4080 (tubes).