Material Capabilities
In the field of stainless steel CNC machining, we are proficient in the fine machining of various stainless steel grades, and can accurately select materials based on the corrosion resistance, strength, and application environment of the workpiece to ensure optimal performance of the parts. The following are our center processing grades, each of which has been verified through 15 years of practical experience, separated from special heat treatment and tool optimization, to overcome the problems of sticking and hardening in stainless steel processing.
303 stainless steel:
Sulfur-containing easy cutting type, sulfur content 0.15% -0.35%, suitable for high-speed milling of threaded parts and shafts. The composition characteristics bring excellent cutting performance, but moderate corrosion resistance. We have optimized the cutting fluid and tool coating to increase machining efficiency by 30%, which is typically applied to valve cores and fasteners.
304 stainless steel:
The most commonly used austenitic stainless steel, with 18% chromium and 8% nickel, good corrosion resistance, suitable for food grade and ordinary industrial environments. The processing difficulty lies in the high toughness and easy occurrence of burrs. We adopt low-temperature cooling and multi axis linkage strategy, and the surface roughness is stable below Ra0.8 μ m.
316/316L stainless steel:
Add 2% -3% molybdenum to enhance resistance to chloride ions and acidic environment corrosion. 316L low-carbon version is suitable for welding and processing. Widely used in the medical and marine fields, we have accumulated over 2000 project experiences on 316L milling components, maintaining a precision of ± 0.01mm even after increasing hardness.
410 stainless steel:
Martensitic, heat treatable to HRC40, high strength but poor weldability. Suitable for wear-resistant areas, we have developed a dedicated annealing process to prevent cracks.
17-4PH stainless steel:
Precipitation hardening type, with a strength of 1170MPa after aging treatment, while maintaining good corrosion resistance. The processing difficulty lies in the high hardness after aging. We use PCD cutting tools and vibration suppression technology to achieve ultra-high precision of ± 0.01mm even after completing the 17-4PH hardness treatment.
2205 duplex steel:
A mixed structure of ferrite and austenite, with twice the resistance to stress corrosion and pitting corrosion as 316, suitable for high-pressure oil and gas environments. We control its biphasic equilibrium heat treatment to ensure microstructural stability.
Material Comparison Table (for customers to quickly select):
|
Grade |
Corrosion Resistance |
Tensile Strength (MPa) |
Typical Applications |
Our Machining Experience |
|
303 |
Moderate |
620 |
Threaded parts, shafts, fittings |
High-speed milling, 30% efficiency improvement |
|
304 |
Good |
515 |
Food equipment, enclosures, brackets |
Ra 0.8μm surface, 200+ successful projects |
|
316 / 316L |
Excellent |
515 |
Medical devices, marine, chemical |
Superior chloride resistance, ±0.01mm tolerance |
|
410 |
Moderate |
700 (after heat treatment) |
Wear-resistant valves, fasteners |
Specialized annealing process, crack-free |
|
17-4PH |
Good |
1170 |
Aerospace structural parts, shafts |
Post-aging ±0.01mm precision with PCD tools |
|
2205 Duplex |
Superior |
620 |
Oil & gas valves, high-pressure parts |
H₂S corrosion resistance, controlled microstructure |
Machining Capabilities
Our CNC milling stainless steel capability covers 3-axis, 4-axis to 5-axis linked milling machines. The core equipment includes high-end models such as DMG MORI, Mazak, and Haas, which can complete one-time processing of complex surfaces, deep cavities, and multiple angles. The maximum processing scale is 800 × 600 × 500mm, and the minimum feature scale is 0.2mm (for micropores and thin walls).
Typical processing types include:
Flat milling and contour milling:
Used for shells and brackets
Slot milling and thread milling:
High-precision internal structure
5-axis linkage:
Complex aviation hydraulic joint
The annual production capacity exceeds 500000 pieces, supporting rapid trial production of small batches of 50 pieces to large-scale production of 100000 pieces. Whether it's prototype validation or mass production delivery, our precision milling service and custom milled parts can meet strict delivery requirements. The workshop is equipped with a constant temperature and humidity environment to prevent thermal expansion and contraction from affecting accuracy.
Precision & Tolerance
We promise to have tight tolerance machining, with a standard linear accuracy of ± 0.005mm, and a positional control of flatness of 0.005mm/100mm, cylindricity of 0.003mm, and coaxiality of 0.005mm. In response to the deformation characteristics of stainless steel, we use finite element simulation and real-time compensation technology to ensure batch consistency.
Complete testing equipment:
- Zeiss/CMM Coordinate Measuring Machine (accuracy 1.5 μ m)
- Summarizer and roughness meter (Ra0.2 μ m measurable)
- Laser scanner for cluttered surfaces
- The quality system is certified by ISO 9001:2015 and supports PPAP, FAI first article inspection, and third-party testing statements (SGS/CNAS). Each component can be traced back to the raw material batch, and high precision milling is our core competitiveness.
Surface Treatment
The surface treatment of stainless steel milling parts directly affects their corrosion resistance and appearance. We provide a complete set of post-treatment plans that comply with international standards:
Passivation:
Adhere to ASTM A967 standards, remove free iron, enhance corrosion resistance, suitable for medical and food grade parts.
01
Electropolishing:
Ra<0.4 μ m mirror effect, removes micro burrs, and improves surface cleanliness.
02
Beam Blasting:
With an average matte appearance, it eliminates machining marks and is suitable for exterior parts.
03
Brushed Finish:
A classic metallic texture commonly used for consumer electronics and medical casings.
04
Coating:
PVD titanium plating (gold/black), electroplated nickel plating to enhance hardness and wear resistance.
05
All comparison charts before and after disposal are provided for reference to ensure that the surface finish stainless steel parts meet the customer's specified request.
Industry Applications
Industries We Serve with Stainless Steel Milling Parts
Medical & Surgical
Surgical instruments, implant stents, endoscopic components, etc. We strictly adhere to the ISO 13485 medical device quality system and provide sterile medical sterile parts. Real case: Customized 316L surgical forceps components for a well-known medical device company in Germany, with a tolerance of ± 0.005mm and an electrolytic polished Ra0.4 μ m surface. After 100000 sterilization cycles, there was still no corrosion, and the customer reported that "the accuracy and biocompatibility far exceeded expectations".
Aerospace & Defense
Components, hydraulic connectors, sensor housings. Case: Processing 17-4PH hydraulic valve body for a US defense supplier, undergoing 5000psi pressure testing, 5-axis processing and one-time molding, saving 30% assembly time.
Food & Beverage
Pump body, valve core, pipeline joints. Compliant with FDA and 3-A hygiene regulations, food grade stainless machining ensures no contamination. Case: Provided 2205 duplex steel valve components for European dairy equipment manufacturers, with acid and alkali resistant cleaning and continuous operation for 2 years without leakage.
Oil & Gas
Valve components, seals, and downhole tools. Resistant to H ₂ S and high-pressure corrosion. Case: Processing 316L wellhead joints for Middle Eastern oil giants, certified by NACE MR0175, resistant to sulfide stress cracking.
Semiconductor
Wafer fixtures and cavity components. Ultra clean appearance (Ra0.2 μ m), with no residual particles. Case: Providing 304 cavity with Class 100 cleanliness to Taiwanese semiconductor equipment manufacturers to help improve chip yield.
Each industry has a complete DFM (Design for Manufacturing) optimization report, which helps customers reduce costs by more than 15%.
Why Choose Us
Why Global Manufacturers Choose Us for Stainless Steel Milling
Global manufacturers choose us as custom stainless steel parts manufacturers and stainless steel milling suppliers due to the following hard core capabilities:
15 years of specialized experience in stainless steel milling, serving over 500 customers and covering more than 30 countries/regions.
Delivery guarantee: Sample delivery takes 7 days, batch delivery takes 15 days, and compensation for delay.
DFM free process optimization: Provide 3 sets of optimization plans at the same time as the quotation, evenly saving 20% of the cost.
Real customer cases and evaluations:
- The precision and delivery time are impeccable! "- John Miller, Aerospace Inc., USA
- Medical grade appearance treatment specialty "- Dr. Schmidt, MedTech GmbH, Germany
- Certification Wall: ISO 9001:2015, IATF 16949, RoHS, REACH.
- We are not just suppliers, but also your strategic partners in fine processing.
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