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What are the quality requirements for ferrovanadium used in construction steel?

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What are the quality requirements for ferrovanadium used in construction steel?

December 11, 2025
Dernière affaire concernant What are the quality requirements for ferrovanadium used in construction steel?

Quality Requirements for Ferrovanadium Used in Construction Steel​

Composition, Purity, and Physical Standards for FeV in Rebars & Structural Steel
When ferrovanadium (FeV) is used in construction steel​ (e.g., rebar, beams, high‑strength low‑alloy or micro‑alloyed structural steel), the quality must ensure consistent mechanical properties and reliable processing.

Key Quality Parameters

Parameter
Typical Requirement for Construction Steel
Reason
Vanadium content​
40–80 % (commonly FeV40–FeV50)
Provides sufficient V for precipitation strengthening & grain refinement
Aluminum (Al)​
≤ 1.5 % (lower is better)
Excess Al can cause inclusions, affect weldability
Silicon (Si)​
≤ 2.0 %
High Si can alter steel chemistry, affect toughness
Carbon (C)​
≤ 0.20 % (preferably ≤ 0.10 % for weldable steels)
Lower C improves ductility and weldability
Phosphorus (P)​
≤ 0.05 %
P causes embrittlement, especially in seismic zones
Sulfur (S)​
≤ 0.05 %
S forms sulfide inclusions, reduces toughness
Nitrogen (N)​
Controlled (typically < 0.05 %)
Excessive N can cause strain aging in rebar
Size & Shape​
Lump 10–80 mm or crushed/granular as per steel mill feed system
Ensures smooth furnace/ladle addition, avoids dust
Uniformity​
Homogeneous composition batch‑to‑batch
Guarantees consistent steel strength and toughness

Additional Considerations

  • •
    Low gas content (O, H)​ preferred to avoid porosity in steel.
  • •
    Trace elements​ (Cu, Ni, Cr) may be restricted if they interfere with corrosion performance.
  • •
    Certificate of Analysis (CoA)​ required for each batch, referencing applicable standards (ASTM A481, ISO 5448, or customer specs).
  • •
    Packaging: Moisture‑proof, labeled with grade, batch number, and analysis.
Construction‑specific benefit: Vanadium in FeV refines ferrite grain size and forms fine VC precipitates, increasing yield strength​ and fatigue resistance​ of rebar and structural sections without large carbon additions.
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