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China Stainless Steel CNC Machining Services - Top Suppliers & Factory for Precision Parts
We maintain a full inventory of austenitic, martensitic, precipitation-hardening, and specialty stainless steels to meet the most demanding mechanical performance and corrosion resistance requirements:
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303 Stainless Steel
A free-machining austenitic stainless steel with excellent machinability, ideal for high-volume automated parts, threaded components, and fittings requiring good corrosion resistance.
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304/304L (18-8) Stainless Steel
The most versatile austenitic stainless steel, offering superior corrosion resistance, formability, and weldability. Widely used in food processing, chemical, medical device, and general machinery applications.
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316/316L Stainless Steel
Molybdenum-enhanced austenitic stainless steel with significantly better resistance to chloride corrosion and pitting than 304 series. The preferred choice for marine environments, chemical equipment, high-end medical devices, and pharmaceutical industries.
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416 Stainless Steel
A free-machining martensitic stainless steel that achieves higher strength through heat treatment. Suitable for shafts, gears, and valve components requiring good machinability along with moderate strength and corrosion resistance.
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17-4 PH (630) Stainless Steel
The most widely used precipitation-hardening stainless steel. It achieves high strength (up to H1100 condition) through aging treatment while maintaining good corrosion resistance. Ideal for aerospace, marine, and high-stress structural applications.
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15-5 PH Stainless Steel
An improved precipitation-hardening stainless steel with performance similar to 17-4 PH, but offering better transverse toughness and dimensional stability during heat treatment.
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410 & 420 Stainless Steel
General-purpose martensitic stainless steels. 410 offers moderate strength and corrosion resistance; 420, with higher carbon content, achieves greater hardness through heat treatment. Commonly used in cutlery, shafts, molds, and wear-resistant parts.
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440C Stainless Steel
A high-carbon, high-chromium martensitic stainless steel with the highest hardness among stainless steels (can be hardened to HRC 58+). Exceptional wear resistance makes it ideal for high-end bearings, valve components, surgical instruments, and cutlery.
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Nitronic 60 (218 SS)
A high-performance nitrogen-strengthened austenitic stainless steel offering an exceptional combination of high wear resistance, strength, and corrosion resistance. Particularly suitable for critical applications involving galling and seizing resistance, such as bearings, valve seats, bushings, and food processing equipment.
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Frequently Asked Questions
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What is the difference between 304 and 316 stainless steel?
316 stainless steel contains molybdenum, which gives it significantly better resistance to chloride corrosion and pitting compared to 304. This makes 316 the preferred choice for marine, pharmaceutical, and chemical environments, while 304 is more cost-effective for general-purpose applications.
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Which stainless steel grade offers the highest hardness?
440C stainless steel offers the highest hardness among standard stainless steels, capable of being hardened to HRC 58+. Its high carbon and chromium content make it the top choice for high-end bearings, surgical instruments, and precision cutting tools.
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What are precipitation-hardening stainless steels, and when should I use them?
Precipitation-hardening (PH) stainless steels, such as 17-4 PH and 15-5 PH, achieve high strength through an aging heat treatment process. They combine the corrosion resistance of austenitic grades with strength levels approaching tool steels. They are ideal for aerospace components, marine hardware, and high-stress structural parts that require both strength and corrosion resistance.
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Which stainless steel grade is best for high-volume CNC machining?
303 and 416 stainless steels are the top choices for high-volume CNC machining. Both are free-machining grades with added sulfur to improve chip breaking and reduce tool wear, making them highly efficient for automated production of threaded parts, shafts, gears, and fittings.
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What makes Nitronic 60 different from standard austenitic stainless steels?
Nitronic 60 is nitrogen-strengthened and specifically engineered for exceptional galling and seizing resistance — a property that standard austenitic grades like 304 or 316 cannot match. It also offers higher strength and excellent corrosion resistance, making it the preferred material for valve seats, bushings, bearings, and food processing equipment subjected to metal-to-metal contact.
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How do I choose between 410 and 420 stainless steel?
Both 410 and 420 are general-purpose martensitic stainless steels. 410 is suitable when moderate strength and corrosion resistance are required. 420, with its higher carbon content, can be heat-treated to achieve greater hardness, making it the better choice for applications demanding wear resistance, such as cutlery blades, molds, and precision wear parts.
Finishes and Post-Processing Options
The zinc alloy substrate is highly suitable for various surface treatments to enhance decoration, protection, or functionality:
Electroplating: Such as chrome, nickel, gold, or silver plating, providing a highly decorative appearance, excellent wear and corrosion resistance. This is the most common choice.
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Passivation or Chromate Conversion Coating:
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Powder Coating:
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Painting:
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Physical Vapor Deposition (PVD):
Design and Machining Considerations
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Process Selection:
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Design Considerations:
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Material Selection:
Zamak 3 and 5 are suitable for the vast majority of general-purpose parts requiring good appearance and strength; ZA-8 is better for wear and bearing applications; for making rapid tooling, choose specialized alloys like Kirksite.
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