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Non-Ferrous Bronze
Manganese Bronze
Grade: ParchHigh Tier
Manganese bronze solids and castings
Market Price EstimateUpdated Daily
$3,450/ MT
+225 (7%)vs yesterday
Verified specifications & market data
Chemical Composition
Elemental breakdown by percentage weight.
Standard composition limits
Values represent maximum allowed percentage unless otherwise noted.
Physical Properties
Material form, density, and contamination specifications.
Premium marine-grade manganese bronze scrap; copper-zinc-manganese alloy optimized for seawater corrosion resistance and high strength; specialized foundry feedstock; significant supply constraint; premium marine metal
Acceptable Inclusions
- Seawater corrosion and patina
- Salt/mineral deposits and residue
- Light to moderate surface oxidation
- Marine fouling deposits (rust, algae residue)
- Manganese 10-15% (defining element)
- Zinc 15-25% (alloy component)
- Lead <1.0% (strict marine tolerance)
- Tin <3% (minor component)
Prohibited Materials
- Copper content <55% (must be manganese bronze minimum)
- Zinc content <15% or >25% (composition imbalance)
- Manganese <10% (insufficient strength; not manganese bronze)
- Lead >1.0% (exceeds marine specification; seawater hazard)
- Iron >1.5% (ferrous contamination; corrosion concern)
- Stainless steel or aluminum contamination
- Heavy cast iron or steel mixing
- Unknown bronze alloy (composition uncertain)
- PCB or electronic components
- Radioactive materials
Quality Assurance
Testing protocols, sampling methods, and acceptance criteria.
Sampling Protocol
frequencyRandom stratified sampling across different marine component types; manganese content verification ; seawater corrosion evidence assessment
maximumQuantity75-100 samples per shipment
minimumQuantity1-2 tonnes or 30-50 samples
percentage8-12% of lot
stratificationSample across marine component types; manganese content by source; marine service intensity ; corrosion evidence assessment
Acceptance Limits
all Criteria Must PassMaterial be marine-grade manganese bronze; manganese 10-15% ; marine origin ; alloy composition ; specialty status
copper ContentCopper 55-65% confirmed; quaternary alloy basis
iron LimitIron <1.5% confirmed; ferrous contamination acceptable tolerance
lead LimitLead <1.0% verified; marine seawater specification
manganese Bronze StatusConfirmed as manganese bronze marine specialty; quaternary alloy identity ; marine origin
manganese CriticalManganese 10-15%
marine AuthenticationMarine service history evidenced by seawater corrosion; authentic marine scrap
zinc ContentZinc 15-25% confirmed; alloy component balance
Weight Tolerance
measurementVerified by certified scale; weight accountability for ultra-premium specialty commodity
variance±3% from purchase order weight
Required Test Methods
Visual Alloy Identification
CRITICALEXTREMEMANDATORY
Purpose
- confirm manganese bronze (marine origin)
- assess seawater corrosion evidence
- distinguish from red brass/industrial bronze
Acceptance Criteria
- Quaternary bronze alloy appearance
- characteristic marine corrosion/patina
- no ferrous/stainless contamination
- marine origin apparent
Procedure
- 100% visual inspection
- identify quaternary alloy characteristic color
- assess seawater oxidation patterns
- confirm marine service history evidence
Magnetic Test
Purpose
- Exclude ferrous contamination
- verify non-magnetic bronze character
Acceptance Criteria
- Non-magnetic or minimal magnetic attraction (manganese ferromagnetism weak acceptable)
- strong magnetism flags contamination
Procedure
- Magnet test on sample
- manganese bronze weakly magnetic acceptable
- ferrous attraction indicates steel/iron contamination
Seawater Corrosion & Marine Service Assessment
CRITICALMANDATORY
Purpose
- confirm marine service history
- assess seawater corrosion patina
- authenticate marine-grade status
Acceptance Criteria
- Characteristic seawater corrosion/patina
- marine oxidation evident
- authentic marine service scrap
Procedure
- Visual inspection marine corrosion patterns
- identify salt deposit residue
- assess degree of seawater exposure
- photograph corrosion evidence
Manganese Content Verification
CRITICALABSOLUTEMANDATORY
Purpose
- verify manganese 10-15%
- confirm manganese bronze identity
- authenticate defining specification element
Acceptance Criteria
- Manganese confirmed 10-15% ±0.5% precision
- manganese-bronze identity
- defining element
Procedure
- ICP-AES manganese analysis
- manganese percentage quantification
- document Mn % with precision
- manganese criticality
Comprehensive XRF Elemental Profile
CRITICALEXTREME
Purpose
- verify Cu 55-65%, Zn 15-25%, Pb <1.0% strict marine, Fe <1.5%
- assess ALL elemental composition
Acceptance Criteria
- Cu 55-65%, Mn 10-15%, Zn 15-25%, Pb <1.0%, Fe <1.5%
- quaternary alloy specification
Procedure
- Comprehensive XRF analysis
- elemental quantification all elements
- manganese explicit precision (±0.5%)
- marine specification compliance verification
Lead & Hazmat Verification
Purpose
- Confirm lead <1.0% strict marine limit
- verify hazmat compliance for seawater service
Acceptance Criteria
- Lead <1.0% STRICTLY confirmed
- marine hazmat specification
Procedure
- XRF/ICP-AES lead quantification
- strict marine limit verification
- seawater safety confirmation
Bronze Alloy Type Identification
Purpose
- Determine specific marine manganese bronze type
- distinguish from industrial bronze
- authenticate specialty status
Acceptance Criteria
- Confirmed marine-grade manganese bronze specialization
- not industrial bronze
Procedure
- XRF quaternary profile + visual marine characteristics + seawater corrosion evidence + marine source documentation