Cartridge Brass (≈70% Cu, 30% Zn) — Formability in Manufacturing Which processing routes are feasible for cartridge brass under typical room-temperature or moderately warm working conditions?

Introduction / Context:Cartridge brass (about 70% copper, 30% zinc) is renowned for its excellent cold-workability. It is routinely used for cartridge cases, radiators, condenser tubes, deep-drawn components, and flexible metal hose due to its combination of ductility, strength after work hardening, and good corrosion resistance.

Given Data / Assumptions:

• All options describe standard metalworking operations: rolling, wire drawing, and tube forming.
• Material: cartridge brass with typical mill anneals between passes.
• Room-temperature or moderately warm forming is intended.

Concept / Approach:Cartridge brass possesses high ductility and strain-hardening capacity, allowing substantial cold-reduction before requiring an anneal. It can be cold rolled to thin sheet and strip, drawn into wire with sequential reductions, and formed into seamless tubes by cupping-and-drawing or by tube-drawing processes. These are industrially standard for this alloy family.

Step-by-Step Solution:Assess each process: rolling, wire drawing, and tube forming all require good ductility.Match with alloy capability: cartridge brass meets these requirements exceptionally well.Conclude that any one of the listed processes is feasible.

Verification / Alternative check:Product catalogs show cartridge brass available as sheet/strip, wire, and tubes; cold-working is routine with intermediate anneals.

Why Other Options Are Wrong:The specific single-process options (a–c) are each correct but incomplete.“Only after full annealing at 900° C” is misleading; while anneals are used between reductions, extreme high-temperature anneals are not a universal prerequisite for feasibility.

Common Pitfalls:Confusing brass series; some brasses with higher zinc or lead vary in formability, but 70/30 cartridge brass is notably formable.

Final Answer:any one of these