Overview
Lead brass plate is a copper-zinc alloy with added lead (typically 1-3%), enhancing its machinability for precision industrial applications. It combines the corrosion resistance of brass with improved cutting and threading performance, making it ideal for complex mechanical components. The material is commonly supplied in cold-rolled or hot-rolled sheets with standardized thicknesses ranging from 0.5mm to 50mm. This alloy belongs to the C36000 series under UNS classification, with specific grades varying by regional standards (e.g., CW612N in Europe). Its distinctive golden-yellow appearance and consistent material properties have established it as a preferred choice for manufacturers requiring reliable metal stock with minimal tool wear during processing.
Physical and Chemical Properties
The physical properties of lead brass plate stem from its ternary alloy composition. Lead particles dispersed in the brass matrix reduce friction during machining while maintaining structural integrity. Typical tensile strength ranges between 340-460 MPa, with elongation properties of 25-40% depending on temper and lead distribution. Chemically, the material demonstrates excellent resistance to dezincification in most aqueous environments and maintains stability in temperatures up to 200°C. Its thermal conductivity (approximately 120 W/m·K) and electrical conductivity (28-35% IACS) make it suitable for certain electrical applications despite the presence of lead. The alloy's coefficient of thermal expansion (20.5 × 10⁻⁶/°C at 20-300°C) ensures dimensional stability in varying operational conditions.
Main Applications
Approximately 60% of lead brass plate production serves the valve and fitting industry, where its combination of pressure tightness and machinability meets stringent requirements for fluid handling systems. Manufacturers extensively use it for pump components, pressure regulator bodies, and hydraulic system parts where corrosion resistance against water, fuels, and mild chemicals is essential. The automotive sector utilizes lead brass plates for bushings, thrust washers, and lock components due to the material's wear resistance and anti-galling properties. In architectural applications, selected grades with polished finishes appear in decorative facades, door hardware, and historical restoration projects. Emerging uses include leaded brass plates as base materials for CNC machining of intricate electronic heat sinks and waveguide components in telecommunications equipment.
Safety and Storage
Handling lead brass plate requires awareness of lead exposure risks, particularly during machining operations that generate dust or fumes. Work areas should employ local exhaust ventilation (LEV) systems, and operators must wear NIOSH-approved respirators when dry cutting or grinding. Finished parts intended for potable water contact must comply with NSF/ANSI 61 or equivalent standards for lead leaching limits. Storage protocols emphasize separation from acidic or ammonia-containing materials to prevent chemical attack. Stacking should employ protective interleaf materials to prevent surface scoring, with indoor storage preferred to minimize oxidation. For long-term storage beyond six months, application of volatile corrosion inhibitor (VCI) paper or coatings helps maintain surface quality without affecting subsequent processing operations.
B2B Procurement Guide
Industrial buyers should specify four critical parameters when procuring lead brass plates: alloy composition (particularly lead percentage), temper (e.g., half-hard, spring), dimensional tolerances (ASTM B248 or equivalent), and surface finish requirements. Mill test reports should verify mechanical properties and chemical analysis for traceability. Leading producing regions include Germany, Japan, and specialized brass mills in Southeast Asia, with material certifications varying by origin (e.g., EN, JIS, ASTM). For prototype development, consider purchasing small quantities from specialty metal distributors offering waterjet or laser cutting services. Bulk purchases typically require 8-12 week lead times for custom dimensions, with container-load quantities (20+ tons) achieving optimal pricing. Recent market trends show increasing demand for low-lead (≤0.25%) alternatives in export markets with strict environmental regulations.
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