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Methodology guide -- CN 7229 (alloy steel wire)
Alloy wire is downstream of alloy wire rod. India is a notable source (~22kt/yr). Methodology mirrors CN 7217 with the alloy-steel emissions profile: ~5-10% above plain carbon steel.
Step 1 -- request the full chain verification. Drawing-only data is insufficient; upstream alloy-rod emissions must be passed through per Reg. 2025/2621 Article 7.
Step 2 -- handle alloy-specific grades. Alloy wire applications (spring wire, music wire, structural strand) demand specific grades. Grade-specific emissions are worth requesting for cost-engineering accuracy.