Editorial Technical Reference

High-Purity Copper-Zinc Master Alloy

This page explains how High-Purity Copper-Zinc Master Alloy is classified within Non-Ferrous Metal Production. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

This master alloy is a pre-alloyed material composed of high-purity copper and zinc in controlled ratios, designed as a foundational input for brass manufacturing.

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Product Specifications

Technical details and manufacturing context for High-Purity Copper-Zinc Master Alloy

Definition

This master alloy is a pre-alloyed material composed of high-purity copper and zinc in controlled ratios, designed as a foundational input for brass manufacturing. It is produced by melting and solidifying electrolytic copper and high-purity zinc to form a homogeneous alloy, which is then cast into ingots. The master alloy format ensures a consistent copper-zinc ratio, minimizing segregation and improving yield in downstream casting operations. When remelted with additional elements, it provides a reliable base for producing various brass alloys with specific mechanical and corrosion-resistant properties. The alloy is characterized by a copper content of 60–70 wt%, zinc content of 30–40 wt%, and a maximum impurity level of 0.05 ppm, as referenced in GB/T 5231. Its melting point ranges from 880–950°C, density from 8.4–8.7 g/cm³, and ingot dimensions are 500×100×50 mm, with a typical weight of 20–25 kg per ingot. Mechanical properties in the as-cast condition include tensile strength of 300–450 MPa, elongation of 20–40%, and Brinell hardness of 60–90 HB. Electrical conductivity is 25–35% IACS, thermal conductivity is 110–130 W/(m·K), and coefficient of thermal expansion is 18–20×10⁻⁶/K (20–100°C). These parameters are indicative and must be verified for specific applications. The master alloy is intended for use in non-ferrous metal production, particularly in brass foundries and secondary smelters. It serves as a primary raw material, reducing melting time and ensuring compositional consistency. For procurement, buyers should confirm that the actual product meets the required specifications and applicable standards with the supplier.

Working Principle

The master alloy is pre-melted and solidified to provide a controlled copper-zinc ratio. When remelted with additional elements, it ensures consistent brass composition, reduces melting time, and minimizes segregation. The pre-alloyed format improves yield in downstream casting by providing a homogeneous starting material.

Common Materials

Electrolytic Copper, High-Purity Zinc

Technical Parameters

Parameter	Typical range	Notes & selection driver
Copper ContentRequired	60–70 %	Weight percentage of copper in alloyGB/T 5231
Zinc ContentRequired	30–40 %	Weight percentage of zinc in alloyGB/T 5231
Impurity LevelRequired	≤0.05 ppm	Maximum total impurity concentrationGB/T 5231
Melting PointRequired	880–950 °C	Liquidus temperature of alloy
DensityRequired	8.4–8.7 g/cm³	Specific gravity of solid alloy
Ingot Size	500×100×50 kg	Standard weight per master alloy ingot
Tensile Strength	300–450 MPa	As-cast conditionGB/T 5231
Elongation	20–40 %	As-cast conditionGB/T 5231
Hardness	60–90 HB	Brinell hardnessGB/T 231.1
Electrical Conductivity	25–35 % IACS	Lower than pure copper due to zincGB/T 3048.2
Thermal Conductivity	110–130 W/(m·K)	At 20°C
Coefficient of Thermal Expansion	18–20 10⁻⁶/K	20–100°C
Weight per Ingot	20–25 kg	Approximate, based on size

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Copper Matrix Part
Primary metallic base providing conductivity and strength

Material: High-purity electrolytic copper
Zinc Alloying Element Part
Alloying component for brass formation and corrosion resistance

Material: High-purity refined zinc
Trace Element Package Optional Part
Controlled minor elements for specific brass properties

Material: Various metallic additives

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for High-Purity Copper-Zinc Master Alloy.

Manufacturers of High-Purity Copper-Zinc Master Alloy

Manufacturer profiles associated with High-Purity Copper-Zinc Master Alloy.

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Procurement Evaluation Criteria

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Technical documentation

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Manufacturing capability

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Frequently Asked Questions

What is the typical copper content of this master alloy?

The copper content is specified as 60–70 wt%, with zinc at 30–40 wt%, according to GB/T 5231. Always verify the exact composition with the supplier for your specific batch.

What are the mechanical properties in the as-cast condition?

In the as-cast condition, the tensile strength is 300–450 MPa, elongation is 20–40%, and Brinell hardness is 60–90 HB. These values are reference ranges and should be confirmed for the actual product.

What is the melting point of this alloy?

The liquidus temperature is 880–950°C. This range is indicative; verify with the manufacturer for the exact alloy composition.

How is this master alloy used in brass production?

It is remelted with additional elements to produce brass alloys with desired properties. The pre-alloyed format ensures consistent composition and reduces melting time, improving efficiency in casting operations.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar (for controlled atmosphere melting)
flow rate:	N/A (solid master alloy addition)
other spec:	Alloy composition: Cu 60-70%, Zn 30-40%, trace elements <0.5%
temperature:	Melting range: 900-1100°C (1652-2012°F), Processing temp: 950-1050°C (1742-1922°F)
slurry concentration:	N/A (solid form)