Materials & Material Selection
Huaquan machines metals and engineering plastics for electromechanical and textile-machinery components. Select the material around the part's working conditions, then define the grade and condition on the drawing.
Engineering Materials for CNC Machining
Our material range covers non-ferrous metals, steels and machinable polymers for turned, milled and precision-machined components.
Non-ferrous metals
6061 and 7075 aluminum, H59/H62 brass, copper and TC4 titanium are included in our published machining range.
For assemblies that will be welded, 6061 is the practical aluminum starting point; 7075 is not a like-for-like replacement in a welded design.
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Options include 45# and Q235 carbon steels, 40Cr and Cr12MoV alloy steels, and 303, 304, 316 and 316L stainless steels.
303 is a free-machining stainless grade for machined features, but its sulfur addition limits its use in more aggressive corrosive service.
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POM, PEEK, nylon, PC and ABS are listed for our plastic machined parts, including non-standard structural and wear components.
Unfilled POM-C suits machined sliding elements with low moisture uptake. Its low surface adhesion makes bonded joints more demanding than mechanical fastening.
Material Selection by Performance Requirements
Set the controlling requirement before changing the material: static strength, corrosion exposure or dimensional behavior under heat and load.
Separate strength from stiffness
Use yield strength for static stress checks and elastic modulus for deflection. Changing from 6061-T6 to 7075-T6 increases strength substantially but changes elastic modulus only slightly.
For bending-driven deflection, review section thickness, support spacing and geometry rather than treating a stronger alloy as the entire solution.
Match the alloy to the medium
Molybdenum-alloyed 316L provides a higher margin against chloride pitting and crevice corrosion than 304. Neither designation is a blanket approval for hot seawater or trapped chloride deposits.
For welded fluid-contact components, the low carbon content of 316L also reduces susceptibility to intergranular corrosion after welding.
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PEEK extends the thermal operating range beyond POM-C, but a melting point is not a continuous-use rating. For loaded polymer parts, assess creep and thermal expansion at the operating temperature.
Use broad bearing surfaces and appropriate clamping pressure where a plastic component carries a sustained compressive load.
Tooling bodies & locating elements
Combine an aluminum fixture body with hardened steel locating bushings at repeated-contact points. Specify replaceable inserts for frequently used threads rather than relying on the base-plate material alone.
Drive components & yarn-contact parts
Separate alloy-steel transmission components from yarn-contact guides in POM, PA66 or polished 304/316L stainless steel. Define yarn-contact radii and surface finish on the drawing, rather than applying a shaft specification to every contact element.
Material Grades, Supply Condition & Composition
Grade & governing standard
Write the material designation and stock-material standard on the drawing. Cross-standard substitutions must match chemistry, product form and mechanical requirements-not just a grade-name cross-reference.
Temper & final condition
T651 includes stress relief by stretching; "6061 aluminum" does not identify that condition. For hardened steel, state the required final hardness and heat-treatment condition instead of leaving only "heat treated."[6]
Purity & compound formulation
For copper, name the grade and any required chemical-purity limit. For plastics, identify the exact polymer compound, filler content and color; natural, glass-filled and carbon-filled materials are separate specifications.