CNC Machining

COMMONLY USED ALUMINUM ALLOYS

Aluminum alloys for high-pressure die casting are dominated by the Al-Si-Cu system, featuring excellent castability and low cost. Alloys for gravity casting (including sand casting and permanent mold casting) mainly use the Al-Si-Mg system and Al-Si system, which are heat-treatable and offer higher strength and corrosion resistance.

High-Pressure Die Casting

Preferred alloys are ADC12/YL113, A380/YL112, suitable for complex thin-walled parts with requirements of high fluidity and low cost; generally not heat-treated.
Gravity Casting

Preferred alloys are A356/ZL101A, ZL104, suitable for medium‑thick wall structural parts requiring high strength, corrosion resistance and heat treatability.
Overlap

A356, ZL104 are also widely used in low‑pressure / counter‑pressure casting; ADC12 is rarely used in gravity casting due to sticking tendency and low performance.

COMMON ALLOYS FOR HIGH-PRESSURE DIE CASTING

Chinese Grade	International Grade	Main Composition (wt%)	Key Characteristics	Typical Applications
YL113	ADC12 / A383	Al-Si9-12Cu1.5-3.5	Excellent fluidity, good overall performance, low cost	Automotive engine covers, motor housings, instrument housings
YL112	A380 / ADC10	Al-Si7.5-9.5Cu3-4	High strength, good wear resistance, dimensional stability	Transmission housings, hydraulic valve bodies, structural components
YL102	A413 / ADC14	Al-Si10-13	Al‑Si10‑13	Thin-walled complex parts, leak‑proof components, heat sinks
YL104	A360	Al-Si9Cu3Mg0.1-0.3	Moderate strength, hot-cracking resistance, good machinability	Pump bodies, valve bodies, general structural parts
YL302	ADC5 / 518	Al-Mg5Si1	High corrosion resistance, anodizable, moderate strength	Decorative parts, outdoor housings, surface‑finished components

COMMON ALLOYS FOR GRAVITY CASTING

Chinese Grade	International Grade	Main Composition (wt%)	Key Characteristics	Typical Applications
ZL101A	A356.0	Al-Si6.5-7.5Mg0.25-0.45	High strength and toughness after T6 heat treatment, good corrosion resistance and weldability	Automotive wheels, suspension parts, engine brackets, aerospace structural parts
ZL104	A357.0	Al-Si8-10.5Mg0.17-0.3	Good castability, high strength, excellent air tightness	Cylinder blocks/heads, transmission cases, complex housings
ZL102	A413.0	AI-Si10-13	Excellent fluidity, low shrinkage, low cost	Low-stress thin-walled parts, instrument housings, decorative parts
ZL105	319.0	Al-Si5-7Cu1-1.5Mg0.4-0.6	Heat resistance, high strength, good castability	Engine cylinder heads, pistons, high-temperature structural parts
ZL201	201.0	AI-Cu4.5-5.3Mn0.6-1.0	Ultra-high strength, heat resistance, average castability	Aerospace and high-load structural components

CERTIFICATE OF HONOR

Quality serves as the cornerstone of Hongtian. We operate under a robust and comprehensive quality management system, holding the IATF16949, ISO9001, and ISO14001 certifications.

IATF 16949:2016

ISO 9001:2015

ISO 14001:2015

Frequently Asked Questions

Q:

Are you a trading company or a direct manufacturer?

A:

We are an experienced factory with more than 20 years of expertise in casting and machining. We boast profound professional knowledge and technical capabilities in this industry. You can rest assured that we are a legitimate manufacturer—you will always see our workshops busy with actual production.

Q:

What types of manufacturing services does your company provide?

A:

We offer a comprehensive range of die casting and gravity casting services, including mold design and manufacturing, aluminum alloy die casting, precision CNC machining, surface treatments (such as sandblasting, painting, and polishing), as well as product quality control and inspection.

Q:

Can you provide a quotation based on 3D drawings?

A:

Certainly. We can provide a formal quotation once we receive your CAD files or editable 3D models. Please note that 2D drawings alone are not enough for the production of high-precision components.

We accept 3D CAD models from various design software, including SolidWorks (.sldprt), Pro/E (.prt), as well as universal file formats like IGES (.igs), STEP (.stp), ACIS (.sat) and Parasolid (.x_t).

Q:

Do you provide samples?

A:

Yes, we provide samples for customers to assess the quality and performance of our products. The sample fee covers production and shipping costs and is calculated based on the order quantity and product complexity.

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