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Stainless Steel CNC Machining Services by China Suppliers - Precision Parts from a Reliable Factory
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:
303 Stainless Steel
Austenitic
A free-machining austenitic stainless steel with excellent machinability, ideal for high-volume automated parts, threaded components, and fittings requiring good corrosion resistance.
304 / 304L (18-8) Stainless Steel
Austenitic
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.
316 / 316L Stainless Steel
Austenitic
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.
416 Stainless Steel
Martensitic
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.
17-4 PH (630) Stainless Steel
Precipitation-Hardening
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.
15-5 PH Stainless Steel
Precipitation-Hardening
An improved precipitation-hardening stainless steel with performance similar to 17-4 PH, but offering better transverse toughness and dimensional stability during heat treatment.
410 & 420 Stainless Steel
Martensitic
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.
440C Stainless Steel
Martensitic
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.
Nitronic 60 (218 SS)
Specialty
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.
Frequently Asked Questions
QWhat is the difference between 304 and 316 stainless steel?
Both are austenitic stainless steels, but 316 contains molybdenum, which significantly improves its resistance to chloride corrosion and pitting. This makes 316 the preferred choice for marine, pharmaceutical, and chemical environments, while 304 is more commonly used in general-purpose food and industrial applications.
QWhen should I choose a precipitation-hardening stainless steel like 17-4 PH or 15-5 PH?
Precipitation-hardening grades such as 17-4 PH and 15-5 PH are ideal when you need a combination of high strength, good corrosion resistance, and the ability to heat treat to specific strength levels. They are widely used in aerospace, marine, and high-stress structural components where standard austenitic grades cannot meet strength requirements.
QWhich stainless steel grade offers the best machinability?
303 and 416 stainless steels are specifically designed for free-machining applications. They contain added sulfur to improve chip breaking and reduce tool wear, making them the top choices for high-volume CNC machining of threaded parts, shafts, and fittings.
QWhat is the hardest stainless steel available for wear-resistant applications?
440C stainless steel achieves the highest hardness among all stainless steel grades, reaching HRC 58+ after heat treatment. Its exceptional wear resistance makes it the material of choice for bearings, valve components, surgical instruments, and high-end cutlery.
QWhat makes Nitronic 60 different from standard austenitic stainless steels?
Nitronic 60 (218 SS) is a nitrogen-strengthened austenitic stainless steel engineered specifically for outstanding galling and seizing resistance — a property that standard grades like 304 or 316 cannot match. It also offers superior wear resistance and strength, making it ideal for bearings, valve seats, and bushings in demanding service conditions.
QHow do I choose between martensitic grades like 410, 420, and 440C?
The choice depends on your hardness and corrosion resistance requirements. 410 provides moderate strength and corrosion resistance for general use. 420 offers higher hardness due to increased carbon content, suitable for cutlery and molds. 440C, with the highest carbon content, delivers maximum hardness and wear resistance, best suited for precision bearings and surgical tools where extreme hardness is critical.
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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