Kobelco · Model MF-38 / US-40
MF-38 / US-40MF-38 / US-40 Flux and wire combination. Applied for ASTM A204 Gr. A, B, C and equivalents
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Individual manufacturer designation and recorded specifications sourced from the official OEM website on 10 October 2026. Supply terms, regional configuration and application suitability are confirmed by quotation. The source does not publish a separate article SKU for this record. OEM photograph unavailable; the image is explicitly labelled model-reference artwork.
| Features | Applied for ASTM A204 Gr. A, B, C and equivalents |
|---|---|
| Classification | AWS A5.23 F8P6-EA3-A3, F9A6-EA3-A3 |
| Type of flux | Fused |
| Redrying of flux | 150-350°Cx1h |
| Polarity | AC |
| Packaging data | Flux | | Can | Wire | φ mm | Spool | Coil; MF-38 | 12x65 | 25kg | US-40 | 2.4 | 20kg | 25kg; | 20x200 | 25kg | | 3.2 | - | 25kg; | 20xD | 25kg | | 4.0 | - | 25kg; | | | | 4.8 | - | 25kg; | | | | 6.4 | - | 25kg; Volume mm | 240W, 350H, 240L | Volume mm | 300W, 110H, 300L | 430W, 90H, 430L |
| Composition (wire mass%) | | Typical | Guaranty a; C | 0.14 | 0.05-0.17; Si | 0.02 | 0.20; Mn | 1.78 | 1.65-2.20; P | 0.009 | 0.025; S | 0.014 | 0.025; Mo | 0.52 | 0.45-0.65; Cu | 0.11 | 0.35; Note: a Single values are maximium. |
| Composition (weld metal mass %) | | Typical | Guaranty a; C | 0.08 | 0.15; Si | 0.34 | 0.80; Mn | 1.58 | 2.10; P | 0.017 | 0.030; S | 0.009 | 0.030; Mo | 0.45 | 0.40-0.65; Cu | 0.12 | 0.35; Note: a Single values are maximium. |
| Weld mechanical properties | | Typical | Guaranty; 0.2%YS (MPa) | 560 | 469min.; TS (MPa) | 630 | 552-689; EI on 4d (%) | 29 | 20min.; IV -51°C (J) | 58 | 27min.; PWHT (°Cxh) | 620x1 | 620±15x1 |
| Approvals / Click here for certificates | NK | KAW3Y50M, H10; Note: Single electrode |
Applied for ASTM A204 Gr. A, B, C and equivalents
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