Material Information

Zinc Die Casting Metals

Zinc is one of the most versatile and widely used metals in die casting. It offers several advantages that make it an excellent choice for producing high-precision components with complex geometries. Here are some key points about zinc casting metals:

 

Zinc alloy characteristics

Complexe Shape
Tight Tolerances
Thinner Walls
Faster Production
Longer Tool Life
Easy Finishing
Environmentally Friendly

 

Zinc, although heavier than other metals, can be a superior option when it comes to strength and durability. And it can be more a cost effective option too. Zinc has a higher melting point than other metals — which means it uses less energy during the manufacturing process. Many manufacturers find die casting in zinc to be the ideal alternative to machined, pressed, stamped, and fabricated components.

 

Applications for Zinc

Complex net-shaped zinc housings, with precise thin walls offer excellent electrical performance and shielding properties.

• Our proprietary multi-slide die casting process and superior thin-wall capabilities make us the foremost supplier of zinc components for broad range of consumer electronic devices.

• The castability of zinc, its wear resistance, and structural integrity make it perfect for the creation of the multi-faceted, highly complex shapes used in automotive safety and electronics industry.

 

Casting Process

Zinc is typically cast using the hot chamber die casting process, which allows for fast production cycles and the ability to cast intricate details with close dimensional tolerances.

The process involves a gooseneck submerged in molten metal, with a vertical plunger driving the metal into the die under high pressure.

 

Zinc That STK Offers

Zamak2
Zinc Alloy 2, also known as Kirksite or Zamak 2 (ASTM AC43A), is the highest strength and hardness of the Zamak family.

Zamak3
Zamak 3 (ASTM AG40A), or Zinc Alloy 3, is the most widely used zinc alloy in North America and is usually the first choice when considering zinc for die casting for a number of reasons.

Zamak5
Zamak 5 (ASTM AC41A) or Zinc Alloy 5, is the most widely used zinc alloy in Europe.

Zamak7
Zamak 7 (ASTM AG40B), or Zinc Alloy 7, is a modification of Zamak 3. It is a high-purity alloy containing lower magnesium content and has a tighter impurities specification. This results in improved casting fluidity, ductility and surface finish.

Za8
ZA-8, or zinc aluminum alloy, contains significantly more aluminum than the Zamak group of alloys. ZA-8 contains approximately 8.4% aluminum and is the only ZA alloy that can be hot-chamber die cast, an important consideration when selecting a material for a component.

AcuZinc5
ACuZinc5 is an alloy researched and developed by General Motors. It is best known for its creep performance, surface hardness, and lubricity.

EZAC
EZAC is a hot-chamber zinc die casting alloy with superior creep resistance, high yield strength, and high hardness.

ZA 27 - Zinc Aluminum
ZA-27, or zinc aluminum alloy, contains significantly more aluminum than the Zamak group of alloys. The number 27 represents the approximate percentage of aluminum.

 

Zinc Alloy Chemical Composition

MECHANICAL PROPERTIES
Alloy Elogngation (%in 50mm) Tensile Strength (MPa) Yield Strength (MPa) Impact Strength (J) Shear Strength (MPa) Hardness (Brinell HB) Process
Zamak 2 7 359 283 47 317 100 Hot Chamber Die Casting
Zamak 3 10 283 221 58 214 82 Hot Chamber Die Casting
Zamak 5 7 328 228 65 262 91 Hot Chamber Die Casting
Zamak 7 13 283 221 58 214 80 Hot Chamber Die Casting
ZA 8 10 374 290 42 275 103 Hot Chamber Die Casting
EZAC 6.7 414 393 - - - Hot Chamber Die Casting

 

COMPOSITION
% Zamak 2 Zamak 3 Zamak 5 Zamak 7 ZA 8
Aluminum 3.5-4.3 3.5-4.3 3.5-4.3 3.5-4.3 8.0-8.8
Copper 2.5-3.0 0.25 0.75-1.25 0.25 0.8-1.3
Magnesium 0.02-0.05 0.02-0.05 0.03-0.08 0.005-0.02 0.015-0.03
Iron(max) 0.1 0.1 0.1 0.075 0.075
Lead (max) 0.005 0.005 0.005 0.003 0.006
Cadmium (Max) 0.004 0.004 0.004 0.002 0.006
Tin(max)
Zinc Bal. Bal. Bal. Bal. Bal.
RoHS Compliant Yes Yes Yes Yes Yes

 

 

PHYSICAL PROPERTIES
Alloy Density (g/cm3) Melting Point (Average +/-50℃) Thermal Conductivity (W/m K) Coefficient of Thermal Expansion (μm/m°K) Electrical Conductivity (% IACS) process
Zamak 2 6.6 385 105 27.7 25 Hot Chamber Die Casting
Zamak 3 6.6 384 113 27.4 27 Hot Chamber Die Casting
Zamak 5 6.6 383 109 27.4 26 Hot Chamber Die Casting
Zamak 7 6.6 384 113 27.4 27 Hot Chamber Die Casting
ZA 8 6.3 390 115 23.3 27.7 Hot Chamber Die Casting
EZAC 6.49 396 - - - Hot Chamber Die Casting

 

Zinc Surface Finishing

The surface treatment of zinc alloys help to enhance its appearance aesthetics, corrosion resistance and wear resistance and other properties.

Our zinc surface finishing includes, but is not limited to:

Powder Coating
Wet Paint
Bright/Matt Chrome Plating
Black and variegated electroplating
NickelPlating
Gold Plating
Sandblasting
PVD Coating
Laser engraving

Aluminum Die Casting Metals

Aluminum castings are lightweight and able to withstand the highest operating temperatures of all die cast alloys.

 

Aluminum Alloy Characteristics

Lightweight & Durable
Good Strength-to-Weight Ratio
Great Resistance to Corrosion
Excellent Electrical Conductivity
Fully Recyclable and Reusable in Production
High Operating Temperatures

 

Aluminum’s strength, corrosion resistance, and heat dissipating properties offer mechanical designers significant advantages. And our proprietary Thin Wall Aluminum Technology has made aluminum die casting an option for even more applications.

 

Aluminum Alloys That STK Offers

Aluminum Alloy A380
A380 is one of the most commonly specified aluminum alloys with a number of significant benefits

Aluminum Alloy 383 (ADC12)
If your component is highly intricate, 383—also known as ADC12 in Asia—is often used as an alternative to A380.

B390
B390 is an aluminum alloy with high hardness and good wear resistance.

A413
A413 is an aluminum alloy with excellent pressure tightness.

413
413 is an Aluminum based alloy that is used for die casting parts.

K-Alloy
K-Alloy is an aluminum, cold-chamber die cast alloy that was engineered to protect components against harsh operating environments.

A360
A360 is an aluminum alloy with excellent pressure tightness and fluidity.

 

Aluminum Alloy Chemical Composition-JIS & ASTM Standard

ALUMINUM ALLOY INGOT CHEMICAL COMPOSITION
JIS H2118:2000 Cu Si Mg Zn Fe Mn Ni
ADC1(AD1.1) 1.00Max 11.0-13.0 0.30Max 0.50Max 0.9Max 0.30Max 0.50Max
ADC3(AD3.1) 0.60Max 9.0-10.0 0.45-0.60 0.50Max 0.90Max 0.30Max 0.50Max
ADC5(AD5.1) 0.20Max 0.30Max 4.1-8.5 0.10Max 1.10Max 0.30Max 0.10Max
ADC6(AD6.1) 0.10Max 1.00Max 2.6-4.0 0.40Max 0.60Max 0.4-0.6 0.10Max
ADC10(AD10.1) 2.0-4.0 7.5-9.5 0.30Max 1.00Max 0.9Max 0.50Max 0.50Max
ADC10Z(AD10Z.1) 2.0-4.0 7.5-9.5 0.30Max 3.00Max 0.9Max 0.50Max 0.50Max
ADC12(AD12.1) 1.5-3.5 9.6-12.0 0.30Max 1.00Max 0.9Max 0.50Max 0.50Max
ADC12Z(AD12Z.1) 1.5-3.5 9.6-12.0 0.30Max 3.00Max 0.9Max 0.50Max 0.50Max
ADC14(AD14.1) 4.0-5.0 16.0-18.0 0.50-0.65 1.50Max 0.9Max 0.50Max 0.30Max

 

ALUMINUM ALLOY INGOT CHEMICAL COMPOSITION
ASTM B85-96 Cu Si Mg Zn Fe Mn Ni
A356.1 0.25Max 6.5-7.5 0.25-0.45 0.35Max 0.50Max 0.35Max -
A356.2 0.10Max 6.5-7.5 0.30-0.45 0.05Max 0.12Max 0.05Max -
A360 0.60Max 9.0-10.0 0.4-0.6 0.50Max 1.30Max 0.35Max 0.50Max
A360.1 0.60Max 9.0-10.0 0.45-0.6 0.40Max 1.00Max 0.35Max 0.50Max
A380.0 3.0-4.0 7.5-9.5 0.30Max 3.00Max 1.30Max 0.50Max 0.50Max
A380.1 3.0-4.0 7.5-9.5 0.10Max 2.90Max 1.00Max 0.50Max 0.50Max
A383 2.0-3.0 9.5-11.5 0.10Max 3.00Max 1.30Max 0.50Max 0.50Max
A413.1 1.00Max 11.0-13.0 0.10Max 0.40Max 1.00Max 0.35Max 0.50Max
A413.2 0.10Max 11.0-13.0 0.05Max 0.05Max 0.60Max 0.05Max 0.05Max

 

ALUMINUM Surface Finishing

STK will manage customer finishing requirements to ensure parts meet specifications in both a timely and cost-effective manner.

Our aluminum surface finishing includes, but is not limited to:
Powder Coating (electrostatic application)
Wet Paint
Chromate
E-Coat
Electroless Nickel
Chrome

Gravity Casting Metals

Gravity casting, also known as permanent mold casting, is a widely used process for producing high-quality metal parts. When it comes to zinc casting metals, this method offers several advantages and unique characteristics. Here are some key points about gravity casting of zinc casting metals:

 

Process Overview:

In gravity casting, molten zinc is poured into a mold using the force of gravity, without the need for external pressure.

This method is suitable for producing parts with complex geometries and fine details.

 

Advantages:

• Excellent Fluidity: Zinc alloys have excellent casting fluidity, which allows for the production of intricate and detailed parts.
• Good Surface Finish: Gravity casting of zinc results in parts with smooth surfaces, reducing the need for extensive post-casting machining.
• Dimensional Accuracy: The process provides high dimensional accuracy, making it ideal for precision components.
• Cost-Effective: Reusable molds reduce tooling costs.
• Sustainability: The molds can be used repeatedly, minimizing waste.

 

Zinc Alloys Used:

Common zinc alloys used in gravity casting include Zamak 3, Zamak 5, and ZA-83.

Zamak 3 is known for its excellent castability and finishing characteristics, while ZA-8 offers additional strength and creep resistance.

 

Applications:

Gravity-cast zinc parts are used in various industries, including automotive, electronics, and decorative hardware.

Typical products include housings, brackets, and intricate decorative items.

 

Considerations:

Mold Material: The choice of mold material (e.g., sand, metal, or ceramic) can affect the quality and properties of the final product.

Cooling Rate: Proper control of the cooling rate is essential to minimize defects and ensure the desired mechanical properties.

 

Zinc Alloy Chemical Composition

MECHANICAL PROPERTIES
Alloy Elogngation (%in 50mm) Tensile Strength (MPa) Yield Strength (MPa) Impact Strength (J) Shear Strength (MPa) Hardness (Brinell HB) Process
Zamak 2 7 359 283 47 317 100 Gravity Die Casting
Zamak 3 10 283 221 58 214 82 Gravity Die Casting
Zamak 5 7 328 228 65 262 91 Gravity Die Casting
Zamak 7 13 283 221 58 214 80 Gravity Die Casting
ZA 8 10 374 290 42 275 103 Gravity Die Casting
EZAC 6.7 414 393 - - - Gravity Die Casting

 

COMPOSITION
% Zamak 2 Zamak 3 Zamak 5 Zamak 7 ZA 8
Aluminum 3.5-4.3 3.5-4.3 3.5-4.3 3.5-4.3 8.0-8.8
Copper 2.5-3.0 0.25 0.75-1.25 0.25 0.8-1.3
Magnesium 0.02-0.05 0.02-0.05 0.03-0.08 0.005-0.02 0.015-0.03
Iron(max) 0.1 0.1 0.1 0.075 0.075
Lead (max) 0.005 0.005 0.005 0.003 0.006
Cadmium (Max) 0.004 0.004 0.004 0.002 0.006
Tin(max)
Zinc Bal. Bal. Bal. Bal. Bal.
RoHS Compliant Yes Yes Yes Yes Yes

 

 

PHYSICAL PROPERTIES
Alloy Density (g/cm3) Melting Point (Average +/-50℃) Thermal Conductivity (W/m K) Coefficient of Thermal Expansion (μm/m°K) Electrical Conductivity (% IACS) process
Zamak 2 6.6 385 105 27.7 25 Gravity Die Casting
Zamak 3 6.6 384 113 27.4 27 Gravity Die Casting
Zamak 5 6.6 383 109 27.4 26 Gravity Die Casting
Zamak 7 6.6 384 113 27.4 27 Gravity Die Casting
ZA 8 6.3 390 115 23.3 27.7 Gravity Die Casting
EZAC 6.49 396 - - - Gravity Die Casting

 

Zinc Surface Finishing

The surface treatment of zinc alloys help to enhance its appearance aesthetics, corrosion resistance and wear resistance and other properties. Our zinc surface finishing includes, but is not limited to:
• Powder Coating
• Wet Paint
• Bright/Matt Chrome Plating
• Black and variegated electroplating
• NickelPlating
• Gold Plating
• Sandblasting
• PVD Coating
• Laser engraving

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