Bronze Ingots

Description

1. Product Overview

Bronze Ingots (UNS C22000 – C95800 equivalent) are high-performance copper-tin alloy castings, precision-engineered for heavy-load bearings, marine hardware, and industrial valve components. Their superior corrosion resistance, low friction coefficient, and exceptional machinability make them the strategic material of choice for mission-critical applications where steel or pure copper would fail. As global supply chains tighten, securing certified, traceable bronze ingots directly mitigates production downtime risks and ensures metallurgical consistency across multi-site manufacturing.

2. Key Specifications & Technical Characteristics

• Chemical Composition (typical, per ASTM B22 / SAE J461):

  • Copper (Cu): 78–90%

  • Tin (Sn): 3–12%

  • Lead (Pb): 0–8% (lead-free grades available upon request)

  • Zinc (Zn), Phosphorus (P), Nickel (Ni): ≤2% total

• Purity Level / Grade:

  • Electrolytic-grade base copper

  • Standard: C90500 (bearing bronze), C93200 (high-leaded tin bronze), C95800 (aluminum bronze)

• Physical Characteristics:

  • Form: Trapezoidal or small ingots (each 8–12 kg)

  • Color: Reddish-gold (high copper) to silvery-yellow (high tin)

  • Density: 8.70–8.95 g/cm³

  • Grain structure: Fine equiaxed, porosity <1.5% (per X-ray inspection)

• Packaging Options:

  • Naked ingots strapped in steel-banded wooden crates (1 MT per crate)

  • Anti-tarnish VCI paper interleaving for export

• Shelf Life: Indefinite when stored in dry, covered conditions (RH <60% recommended)

3. Core Industrial Applications

• Heavy Machinery & Bearings:
  Used for centrifugal cast bushings and worm gears – outperforms standard brass by 40% in fatigue life under high-load, low-speed conditions (PV limit up to 75,000 psi·fpm).

• Marine & Offshore Equipment:
  Propeller shafts, seawater valve stems, pump impellers – aluminum bronze grades resist crevice corrosion and cavitation damage 3x longer than 316L stainless steel in saltwater environments.

• Oil & Gas / Hydraulic Systems:
  Valve guides, safety relief valve seats – the low galling tendency prevents seizure in high-pressure (5,000+ psi) sour gas applications, reducing maintenance intervals by 60%.

• Electrical Switchgear:
  Arcing contacts and resistance welding tips – phosphorus bronze grades offer excellent conductivity (15% IACS min) plus spring retention after 1 million cycles.

4. Competitive Advantages

• Quality Consistency: Each batch certified via optical emission spectrometry (OES) + third-party SGS inspection. Traceability from cathode origin to ingot stamp.

• Supply Reliability: 5,000 MT monthly melting capacity with 48-hour lead time from three strategically located foundries (SE Asia, MENA, South America).

• Logistics Capability: Pre-shipment fumigation, ISPM-15 certified pallets, and door-to-door Incoterms (FOB, CIF, DAP). Direct container loading reduces transshipment damage.

• Price Competitiveness: Transparent monthly LME + fixed conversion fee model – no hidden alloy surcharges. Volume rebates (2–5%) for contract buyers above 500 MT/year.

• Sustainability: 72% post-industrial recycled content (GreenPro certified) with lower embedded carbon vs. virgin ingots. Full RoHS and REACH compliance documentation.

• Technical Support: Dedicated metallurgist for alloy selection + casting defect troubleshooting (root cause analysis included for first 3 orders).

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): 20 MT (mixed grades permitted)

• Loading Capacity per 20′ Dry Container:

  • Standard packing: 24–26 MT (depending on crate design)

  • Max theoretical stack: 28 MT with reinforced flooring

• Lead Time:

  • Stock grades (C93200, C90500): 5–7 days from payment

  • Custom composition: 21 days

• Payment Terms: LC at sight (irrevocable, confirmed) or 30% TT deposit + 70% against copy of B/L for buyers with 2+ years audited purchase history.