Overview
106B Brass is a leaded brass alloy primarily composed of copper (approximately 62%) and zinc (36%), with about 2% lead added to improve machinability. This alloy falls under the C27450 designation in UNS numbering system. The addition of lead creates discontinuities in the microstructure that allow for excellent chip formation during machining operations. First developed in the mid-20th century, 106B Brass became particularly valuable for high-volume production of precision components. Its balanced properties make it suitable for both functional and decorative applications across multiple industries, from electronics to architectural hardware.
Physical and Chemical Properties
The alloy exhibits a characteristic yellow color typical of brass, with a density of approximately 8.5 g/cm³. Its melting range of 900-940°C makes it suitable for various casting and hot working processes. The lead content significantly improves machinability, typically rated at 80% of free-cutting brass standard (compared to 100% for C36000). 106B Brass demonstrates good corrosion resistance in most atmospheric conditions and freshwater environments, though it may tarnish over time. The alloy maintains excellent electrical conductivity (about 28% IACS) while offering better mechanical properties than pure copper. Typical tensile strength ranges from 340-450 MPa with elongation of 15-25% in annealed condition.
Main Applications
In electrical applications, 106B Brass serves as a cost-effective material for connectors, terminals, and switch components where good conductivity and machinability are required. The plumbing industry utilizes this alloy for fittings, valves, and faucet components due to its corrosion resistance and pressure-tight machining characteristics. The decorative hardware sector employs 106B Brass for door handles, cabinet pulls, and architectural accents where both appearance and durability are important. Its consistent machining properties make it particularly valuable for high-volume production of small precision parts across all these applications.
Safety and Storage
Primary safety concerns with 106B Brass relate to lead content and machining operations. Dust generated during machining may contain lead particles, requiring proper ventilation and respiratory protection. Finished products intended for potable water applications must comply with lead content regulations such as NSF/ANSI 61. Storage recommendations include keeping material in a dry environment to prevent surface oxidation. While brass is generally resistant to atmospheric corrosion, prolonged exposure to humid or industrial atmospheres may cause surface tarnishing. Stacking should be organized to prevent physical damage to softer annealed material.
B2B Procurement Guide
When procuring 106B Brass, buyers should specify the required form (rod, sheet, tube) and temper (annealed, half-hard, etc.) based on their manufacturing processes. Mill test reports should be requested to verify chemical composition and mechanical properties. Lead content verification is particularly important for regulated applications. Price negotiation should account for order volume, with typical minimum order quantities ranging from 500kg for rods to several tons for sheet products. Delivery lead times vary from 2-6 weeks depending on mill schedules and required processing. It's advisable to maintain relationships with multiple suppliers to ensure availability during market fluctuations.
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