C27200 Brass

Grade Designation

UNS Number: C27200

Common Name: 65/35 Brass (Cartridge Brass)

Corresponding Standards:

ASTM B36/B36M (Brass Plate/Strip)
ASTM B134 (Brass Wire)
SAE J463 (Wrought Copper Alloys)
GB/T 5231-2012 (China Wrought Brass Standards)

Product Features

Superior Cold Formability: Deep drawing, spinning yield rate >98%
High Strength-Toughness Ratio: Annealed elongation 65%, strength increases by 150% with cold working
Optimized Corrosion Resistance: Resistant to atmospheric/fresh water corrosion, strong surface passivation
Cost-Effective & Eco-Friendly: Lead content ≤0.05%, 35% Zinc content significantly reduces cost
Universal Decorative Appeal: Classic bright yellow color, suitable for plating/painting

Common Product Forms & Dimensions

Form	Thickness (mm)	Width/Diameter (mm)	Length	Special Notes
Plate/Strip	0.01–6.0	10–600	Custom	Max coil width: 600mm
Bar	-	Φ3–350	Custom	Hex/Square bar available
Wire	-	Φ0.15–12.0	Custom	Temper: H04-H08
Tube	Wall: 0.5–12	Φ10–180 (OD)	Custom	Seamless/Welded tube
Note: Custom forms supported (e.g., shaped tubes, stamping blanks)

Chemical Composition

Element	Cu	Zn	Impurity Limits (wt%)
Range	63.5–68.5	Balance	Pb≤0.07, Fe≤0.05, Others≤0.15
Typical	65.0	34.8	Pb 0.03, Fe 0.02
Core Requirement: Cu+Zn ≥99.5%, conforms to ASTM B36 Class A

C27200 Brass Properties

Physical Properties

Property	Value	Test Condition
Density (g/cm³)	8.45–8.55	20°C
Melting Point (°C)	900–930	-
Electrical Conductivity (%IACS)	26±2	Annealed, 20°C
Thermal Conductivity (W/m·K)	115±10	20°C
Thermal Expansion Coeff. (×10⁻⁶/K)	20.5	20–250°C
Hot Working Temp. Range: 750–850°C

Mechanical Properties

Temper	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HV)
O60 (Annealed)	290–350	75–120	≥60	55–75
H02 (1/4 Hard)	380–450	300–350	25–35	100–125
H04 (1/2 Hard)	450–520	380–430	12–20	135–160
H06 (Full Hard)	520–600	480–550	5–10	170–200
Note: Data based on 2mm thickness specimens (ASTM E8)

Core Advantages

1. Exceptional Formability: Deep drawing LDR (Limiting Drawing Ratio) ≥2.2 (Automotive fuel tank manufacturing grade)

2. Cost Control Benchmark: Raw material cost reduced by 18% compared to 70/30 brass

3. Superior Surface Quality: Ra ≤0.8μm (Precision polished finish)

4. Environmental Safety: Compliant with RoHS 3.0, EN 71-3 (Toy Safety)

Product Applications

Military: Cartridge cases, fuze housings
Electronics & Electrical: 5G shielding cans, Type-C connector housings
Automotive Manufacturing: Fuel lines, radiator water chambers
Architectural Decoration: Vintage hardware, art castings
Consumer Goods: Zipper teeth, eyeglass frame blanks

Processing Guidelines

Process	Key Parameters	Risk Control
Stamping	Die clearance ≤10% material thick	Prevent edge cracking (R angle ≥2t)
Annealing	520±10°C × 60–90min	Prevent grain coarsening (Protective atmosphere recommended)
Welding	TIG: Current 80–150A	Argon flow ≥15L/min to prevent Zn fuming
Plating	Cyanide copper pre-plating (3–5μm)	Prevent adhesion loss due to replacement reaction

Key Application Scenarios

Ammunition Case Manufacturing: NATO standard 7.62×51mm cartridge cases
Consumer Electronics: Precision stamped SIM card trays for mobile phones
New Energy Vehicles: Sealing rings for battery cooling systems
High-End Sanitary Ware: Gold-plated faucet valve cores

Frequently Asked Questions (FAQ)

Q1: Performance difference vs C26800 brass?

A: C27200 has higher Zn content (35% vs 33%), improving cold formability by 12%, but reduces conductivity to 26% IACS (C26800: 28% IACS).

Q2: Suitability for marine environments?

A: Requires surface protection (Recommended: Ni layer ≥15μm + Cr plating 0.3μm), otherwise dezincification corrosion rate >0.5mm/year.

Q3: Machining tool selection?

A: Prefer K10/K20 carbide tools. Cutting speed 60–120m/min, feed rate 0.1–0.3mm/rev.

Standards Reference

Standard System	Standard No.	Scope
US Standard	ASTM B36/B36M	Plate/Strip Dimensions & Tolerances
European Std	EN 1652	General Requirements for Cu & Cu Alloy Plate/Strip
China National	GB/T 5231-2012	Chemical Composition & Mech. Prop. of Wrought Brass
Japanese Std	JIS H3100	Copper & Copper Alloy Sheets/Plates

Technical Statement: This data is based on industry-standard processes. Specific parameters are subject to the steel mill's material certificate (Request MTC recommended).
Disclaimer: This specification does not constitute material test certification. Process validation at the application site is required for critical uses.

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