Detailed Machining Properties of Full-range Metal Materials
Master material selection logic & solve tough precision cutting challenges
In precision machinery manufacturing, auto parts, aerospace, medical equipment and intelligent equipment industries, CNC machining serves as the core process for high-precision forming of metal components. Metals vary drastically in hardness, toughness, thermal conductivity and machinability. Material selection directly determines processing cost, finished precision, service life and application scenarios.
Most workshops can only machine mild carbon steel and regular aluminum alloy, yet struggle with high-strength heat-resistant alloys, high-hardness stainless steel and aerospace-grade special titanium alloys. Common defects include tool chipping, tool vibration, workpiece deformation, dimensional deviation and unsatisfactory surface roughness.
We fully sort out mainstream metals for CNC machining, and deeply analyze their mechanical properties, machining difficulties and applicable scenarios. Meanwhile, we reveal how Zorapid breaks through industry bottlenecks in difficult metal machining. With micron-level precision, consistent quality and fast lead time, we undertake customized precision metal part orders that other manufacturers cannot handle.
Complete List of Mainstream Metals for CNC Machining
1. Aluminum Alloy (Most Versatile & Cost-Effective)
Common Grades: 6061-T6, 7075-T6, 6063, 5052
Material Properties
Light weight, low density, excellent thermal conductivity and heat dissipation, good toughness, easy to machine, superior anodizing performance and outstanding rust resistance.
Machining Difficulties
Thin-walled parts are prone to cutting stress deformation; built-up edge easily occurs during high-speed machining; tool marks tend to appear in finish machining.
Application Fields
Automotive structural parts, new energy heat dissipation components, equipment enclosures, automation jigs, communication cavities, precision bicycle parts.
Machining Advantages
High cutting speed, low tool wear, fast delivery efficiency, achievable ultra-high precision tolerance up to ±0.005mm.
Stainless Steel (Top Choice for Corrosion Resistance & High Strength)
Common Grades: 304, 316L, 201, 420, 430
Material Properties
Excellent rust, acid and alkali resistance, high temperature resistance, high mechanical strength and great toughness. Widely adopted for medical and food-grade applications.
Machining Difficulties
High material viscosity and cutting resistance, prone to tool adhesion and severe work hardening. Difficult to achieve smooth finish surface, and deep hole tapping is extremely challenging.
Application Fields
Medical surgical instruments, food machinery components, waterproof sealing parts, chemical equipment, outdoor precision structural parts.
Carbon Steel / Structural Steel (Core Load-Bearing Material)
Common Grades: No.45 Steel, Q235, S45C, 4140 Chromium-Molybdenum Steel
Material Properties
Moderate hardness, high rigidity and excellent load-bearing capacity. It boasts superior comprehensive mechanical properties after quenching and tempering, plus affordable cost.
Machining Difficulties
Hardness rises sharply after heat treatment; ordinary tools fail to cut quenched steel. Large workpieces are susceptible to vibration and deformation during processing.
Application Fields
Shaft parts, gears, mold bases, mechanical transmission components, load-bearing parts for heavy-duty equipment.
Mold Steel (For High-Hardness Wear-Resistant Precision Molds)
Common Grades: H13, S136, NAK80, P20, DC53, SKD11
Material Properties: Reaches HRC50~62 hardness after quenching and tempering. Features superior wear resistance, high temperature resistance, impact resistance and excellent mirror polishing performance.
Machining Difficulties: Extreme hardness brings huge cutting resistance and rapid tool wear. Tools easily chip in roughing; vibration frequently occurs in deep cavity and thin-wall machining.
Application Fields: Plastic molds, die-casting molds, precision fixtures, wear-resistant sliders, long-service-life mechanical parts.
Titanium Alloy (High-End Special Metal for Aerospace & Medical Industry)
Common Grades: TC4/Ti-6Al-4V, Pure Titanium TA1
Material Properties: Lightweight, ultra-high strength, heat and corrosion resistant with excellent biocompatibility. Outperforms steel of the same weight in strength.
Machining Difficulties: Poor thermal conductivity leads to extreme cutting heat, easy burning of workpieces and cutters. High ductility causes tool deflection, recognized as one of the hardest-to-machine metals.
Application Fields: Aerospace components, medical implant parts, high-end outdoor equipment, high-strength lightweight structural parts for new energy industry.
Copper Alloy (Specialized for Electrical & Thermal Conduction)
Common Grades: Pure Copper T2, Brass H62, Beryllium Copper
Material Properties: Top-tier electrical and thermal conductivity, good ductility, wear and corrosion resistance. Beryllium copper gains outstanding elasticity after heat treatment.
Machining Difficulties: Soft texture causes easy deformation and burrs in finishing. Ultra-thin thin-wall copper parts are hard to shape.
Application Fields: Conductive terminals, heat dissipation electrodes, mold inserts, new energy conductive connectors.
Super Alloy (For Extreme Working Conditions)
Common Grades: Inconel 718, Inconel 625
Material Properties: Outstanding resistance to high temperature, high pressure and corrosion. Its mechanical properties remain stable without degradation under high temperature, enabling long-term service in harsh high-temperature and high-pressure environments.
Machining Difficulties: Huge cutting resistance, rapid work hardening and severe tool wear. It is recognized as the most difficult-to-machine material in industrial manufacturing.
Application Fields: Core engine parts, turbine assemblies, high-temperature equipment, aerospace power precision components.
Complete Process of Zorapid Precision CNC Machining
Step 1: Drawing Review & Custom Material Processing Solution
Upon receiving clients’ 2D and 3D drawings, our engineers formulate exclusive cutting parameters, tool selection plans, machining sequences and deformation control solutions based on the hardness, thickness and tolerance requirements of selected metals. We effectively avoid common issues including tool adhesion on stainless steel, high-temperature burning on titanium alloy and stress deformation of aluminum alloy in advance, and deliver full DFM process optimization reports.
Peer Shortcomings
Adopt unified machining parameters for all materials, easily leading to scrap of high-hardness materials.
Our Advantages
Customized processing solution for each single material, effectively reduce scrap rate from the source.
Step 2: Precision Raw Material Blanking
Reserve proper machining allowance according to part dimensions, and set deformation compensation allowance for easily deformable metals. Adopt stress-free cutting for titanium alloys and superalloys to eliminate residual internal stress of raw materials.
Step 3: High-speed CNC Rough Machining for Stock Removal
Equipped with 3-axis / 4-axis / 5-axis machining centers, we apply dedicated cemented carbide cutters matching metal hardness to remove excess material efficiently. Proper finish machining allowance is reserved, with cutting speed and feed rate strictly controlled to prevent machining stress on workpieces.
Step 4: Stress Relief Aging Treatment (Essential for High Precision)
For deformation-prone materials such as 7075 aluminum alloy, titanium alloy and mold steel, natural aging or low-temperature stress relief is conducted after rough machining to release internal cutting stress. It ensures permanent dimensional stability after finish machining and eliminates subsequent distortion and deformation.
Step 5: High-Precision Finish Machining & Forming
We adopt precision processing equipment in constant-temperature workshops matched with professional coated cutting tools. Spindle speed, cutting depth and tool path are strictly controlled to stabilize dimensional tolerance within ±0.005mm, ensuring full compliance of flatness, perpendicularity, concentricity and parallelism.
Step 6: Secondary Finishing & Precision Machining of Holes and Threads
Complete detailed processing including counterbore holes, through holes, blind holes, metric & imperial threads, chamfers and arcs. Special extrusion taps are used for stainless steel and superalloys to avoid thread slipping, tap breakage and insufficient thread precision.
Step 7: Surface Treatment & Full Dimensional Precision Inspection
We perform various surface treatments as required, including anodizing, hard anodizing, sandblasting, polishing, black oxide finishing, galvanizing and passivation.
All finished parts undergo 100% full inspection with CMM, height gauge, roundness tester and roughness tester. Qualified products will be cleaned, packaged and shipped out.
Hard-to-machining Metal CNC Services Only Available at Zorapid
1. Finish Machining of Ultra-high Hardness Mold Steel
Stably process mold steel up to HRC60. Easily form deep cavities, narrow grooves and ultra-thin wall structures, avoiding frequent tool breakage and production halt common among ordinary manufacturers.
2. Precision Machining of Aerospace-grade TC4 Titanium Alloy
Adopt low-temperature cooling cutting technology to fully eliminate thermal burning and tool deflection deformation. Achieve stable mass production of titanium alloy components for aerospace and medical fields.
3. Professional Machining of Inconel 718 Superalloy
Equipped with imported heat-resistant dedicated cutters and customized cutting parameters. Master the most challenging superalloy machining to meet application demands under extreme working conditions.
4. Zero-deformation Machining for Ultra-thin Wall 7075 Aluminum Alloy
Apply stress relief and symmetrical cutting processes. Successfully fabricate aluminum alloy shells with wall thickness as thin as 0.6mm with zero deformation and zero dimensional deviation after processing.
5. Full Coverage from Micro Precision Parts to Large Heavy Components
One-stop machining service covering tiny medical hardware parts, large automotive chassis components and automation frames. Accept orders of any quantity and specification.
Strict Ultra-high Precision Tolerance Control
Standard tolerance: ±0.02mm; Stable precision up to ±0.005mm. Fully comply with high-end assembly standards for automotive, aerospace and semiconductor industries.
Full-dimensional Strict Quality Assurance
- Strictly implement IATF16949 and ISO9001 production quality management systems, fully meeting industrial, automotive and aerospace grade standards.
- All raw metal materials are traceable with available spectral inspection reports to eliminate inferior materials.
- Adopt three-level quality inspection including first-piece inspection, in-process patrol inspection and final inspection throughout production, ensuring defective products never flow into the next process.
- 100% full dimensional inspection for precision parts, complete 3D dimension inspection reports are available.
- Strictly control surface finish, surface texture and burrs. Finished parts can be directly assembled without secondary finishing.
We provide lifelong technical follow-up for material processing technologies. Free remaking and rework are offered for non-artificial quality issues.
Fast & Efficient Delivery Capability
Ample in-stock metal plates and bars, full range of ready stocks including aluminum alloy, stainless steel, mold steel and titanium alloy, no long waiting for materials.
Flexible scheduling with multiple 3-axis, 4-axis and 5-axis machining centers to avoid order backlog.
No minimum order quantity, support orders starting from 1 piece. One-stop service for R&D prototyping, small-batch trial production and mass production.
Fast sample delivery within 3-5 days for standard metal parts, on-time mass order delivery in 7-12 days.
Priority production channel available for urgent orders to fully match clients’ project schedules.
Six Core Advantages of Choosing Zorapid for Metal CNC Machining
Full Material Coverage
We are proficient in machining all mainstream industrial metals, and own mature processing experience for rare special alloys with unlimited material selection.
High Technical Barrier
We solve tough machining difficulties of titanium alloy, superalloy and high-hardness mold steel. We steadily accept and mass-produce orders that other manufacturers dare not take.
Stable & Reliable Precision
Constant-temperature workshop, high-precision equipment and mature processes ensure excellent dimensional consistency in long-term mass production without unstable tolerance deviation.
Controllable & Reasonable Cost
Optimized processing technology cuts trial errors and scrap loss. We strictly control costs while maintaining high precision, delivering far better cost performance than peers.
One-stop Full-process Service
Complete workflow: drawing optimization → material cutting → CNC machining → heat treatment → surface finishing → precision inspection → packaging & delivery. No need for clients to cooperate with multiple suppliers.
Full-cycle Professional Technical Support
Senior process engineers provide one-on-one service. Free material selection and structural optimization suggestions help clients lower design difficulty and manufacturing costs.
FAQ
Which metal features the best cost performance for CNC machining?
6061 aluminum alloy delivers the optimal overall cost performance. It is easy to machine, lightweight, excellent in heat dissipation and cost-effective, making it the preferred material for automation, new energy and general machinery industries.
Which CNC metal has the highest hardness and is the hardest to machine?
Inconel 718 nickel-based superalloy ranks first in machining difficulty, followed by TC4 titanium alloy and high-hardness SKD11 mold steel.
How to solve deformation issues in thin-walled metal parts machining?
Zorapid adopts combined solutions including rough machining stress relief, symmetrical cutting and vacuum fixture positioning to thoroughly eliminate thin-wall deformation via optimized processes.
Can you replicate metal parts according to customer samples?
Yes. We conduct physical reverse scanning and 3D modeling, then perform mass CNC machining with dimensions and precision highly consistent with the original samples.
What surface treatments are available for metal CNC machined parts?
We support anodizing, hard anodizing, sandblasting, wire drawing, mirror polishing, black oxide finishing, galvanization, chrome plating, passivation, quenching and tempering, etc.
What is the minimum size of precision metal parts you can make, and what is the achievable tolerance?
We manufacture ultra-small precision micro hardware parts, with stable high precision tolerance up to ±0.005mm, meeting assembly requirements of high-end precision equipment.
Can you design and manufacture products if I only have ideas without drawings?
Certainly. Provide application scenarios, dimension requirements and working conditions, our engineers will assist with structural design and material selection to deliver finished products in one stop.
Summary
Nowadays, precision CNC metal machining is far more than simple material removal and shaping. The core keys to manufacturing high-quality mechanical components lie in proper material selection, mature processing techniques and accurate deformation control.
Most machining factories in the market are only capable of basic processing of ordinary aluminum and iron parts. They fail to take orders for high-strength, high-hardness and high-precision special metal components, which seriously delays clients’ project progress.
With years of in-depth experience in precision metal CNC machining, Zorapid has fully mastered the cutting characteristics of all types of metals. We are equipped with high-end processing equipment and a professional technical team. We realize fast mass production for regular materials and tackle tough machining tasks for difficult special metals efficiently.
Whether you are engaged in automotive new energy, aerospace, medical equipment or automation equipment industries, we provide reliable one-stop customized machining services for all kinds of precision metal parts. Supported by sophisticated craftsmanship, consistent quality and fast lead time, we help clients seize market opportunities steadily.
