C93700 copper rod production process

The production process of C93700 copper rod combines traditional copper alloy processing technology with special optimization for its high lead-tin bronze characteristics. The specific process is as follows:

1. Raw material processing and batching

Raw material selection: electrolytic copper (purity ≥99.99%), tin ingots, and lead ingots are the main materials, supplemented by trace elements such as zinc and antimony. Some production processes use scrap copper recycling materials, which need to be removed by manual sorting, magnetic separation and briquetting pretreatment.

Precise ratio: According to the C93700 composition standard (Cu 78-82%, Sn 8.5-11.5%, Pb 7.5-9.5%), the feed ratio is dynamically adjusted to ensure that the element content meets the ASTM B584 standard.

2. Melting and alloying

High temperature smelting: Heat to 1200-1400℃ in an electric furnace or induction furnace to completely melt the raw materials. At this stage, a slag remover (such as borax) needs to be added to remove oxides and impurities.

Alloying control: Trace elements such as zinc and antimony are added in the later stage of smelting, and the composition is detected in real time by a spectrometer. If necessary, electrolytic copper or tin-lead is added for adjustment.

3. Molding process

Casting molding: Using a continuous casting machine or sand casting, the molten copper liquid is cast into a rod billet within the hot working temperature range of 750-850℃, and the cooling water circulation accelerates solidification.

Plastic processing: Improve the microstructure through rolling (diameter adjustment), drawing (strength improvement) and extrusion (complex cross-section molding), in which the hot rolling temperature is controlled at 700-800℃ to maintain the ductility of the material.

4. Post-processing and finishing

Annealing treatment: Stress relief annealing is performed at 550-650℃ to eliminate work hardening and restore the toughness of the material.

Surface treatment: Including drawing (removing oxide scale), pickling (surface cleaning), polishing and oiling for anti-oxidation, ensuring that the surface roughness Ra≤1.6μm.

Dimensional finishing: The final forming is completed by straightening machine (straightness error ≤ 0.5mm/m) and CNC sawing (length tolerance ± 0.5mm).

5. Quality inspection and environmental protection measures

Full process inspection: covering chemical composition analysis (ICP spectrum), mechanical property test (tensile strength ≥ 295MPa, elongation ≥ 25%) and flaw detection (eddy current/ultrasonic).

Environmental protection treatment: smelting flue gas is dusted by bag filter (efficiency ≥ 99%), metal elements are recovered from waste slag, and the cooling water recycling rate reaches more than 95%.

Product advantages of C93700 copper rod

1. Excellent mechanical properties

High strength and wear resistance: tensile strength 295MPa, hardness HB60, lead particles form a self-lubricating film, friction coefficient as low as 0.1-0.15, suitable for high-speed heavy-load bearings.

Excellent ductility: elongation 25%, can withstand complex hot and cold processing (such as cold heading, stamping).

2. Unique physical and chemical properties

Corrosion resistance: The corrosion rate in seawater and acidic media is ≤0.02mm/year, which is better than ordinary bronze.

Stable thermal performance: thermal conductivity 46.9W/(m·K), thermal expansion coefficient 17.8×10⁻⁶/K, suitable for high temperature environment (strength retention rate ≥90% at 400℃).

3. Processing and economic advantages

Easy processing: 8-10% lead content improves cutting performance (cutting force is reduced by 30%), suitable for precision turning and milling.

Cost-effectiveness: The utilization rate of scrap copper is 60%, which reduces the raw material cost by 15-20% compared with similar alloys

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