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Stainless Steel CNC Machining Services

Stainless steel alloys have high toughness, ductility, wear, and rust resistance. Stainless steel is easy to be welded, machined, and polished.

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Stainless Steel CNC Machining

The machining of stainless steel can be challenging because of its hardness. 316 is harder machining than 304.

Stainless steel is low carbon steel but it can resist deterioration.  This is the main feature that differs stainless steel from normal steel. All stainless-steel chemical structures consist of at least 10.5% chromium. 

Stainless steel is classified into Austenitic, ferritic, martensitic, and duplex based on the crystalline structure.

Austenitic stainless steel, typical 200 and 300 series,  is extremely formable, nonmagnetic, and can not be hardened. 

Ferritic stainless steels are magnetic and have a better thermal conductivity than austenitic stainless. They can not be solidified by heat treatment.

Martensitic stainless steel, such as quality 416 and 420 can be hardened with multiple techniques of aging or heat treatment.

Duplex stainless steel, also called austenitic-ferritic, is a grade of highly specialized stainless for enhanced rust resistance. Duplex steels are normal in industrial and architectural structuring.

Due to its high strength and hardness, stainless steel CNC machining requires expertise and experience.

Stainless Steel Subtypes

Ultimate tensile strengthYield strengthYoung’s modulus (modulus of elasticity)Elongation at breakCorrosion resistanceMagnetismWeldabilityApplication
Stainless Steel
510 – 590 MPa200 – 230 MPa200 – 212 GPa35 – 46 %ExcellentNon-magnetic in annealed conditionGoodRail car structural components Air frame sections Automotive wheel covers Wiper blade clips and holdersLearn More
Stainless Steel
580 – 700 MPa205 – 350 MPa192 – 200 GPa40 – 50 %ModerateNon-magneticPoorAircraft applications including fittings Shafts and spindles Automatic screw machine applications Medical devices with screw threads Drilled or tapped holes Pump and valve parts Architecturalapplications Nuts and boltsLearn More
Stainless Steel 304/304L520-600 MPa210-250 MPa191 – 205 GPa43-45 %GoodNoExcellentFood handling and precessing equipment Food processing Architectural panelling Sanitary ware and troughs TubingLearn More
Stainless Steel 316/316L480 – 600 MPa170 – 230 MPa190 – 205 GPa38-55 %ExcellentNon-magneticExcellentChemical and petrochemical industry Food processing Pharmaceuticalequipment Medical devices Potable water Wastewater treatment Marine applicationsLearn More
Stainless Steel 
440 – 580 MPa275 – 345 MPa200 GPa7 – 25 %ModerateMagneticPoorValves Pump & motor shafts Washing machine components Gears & bolts Nuts & studs Automatic screw-machined componentsLearn More
Stainless Steel 
485-750 MPa275-380 MPa190 – 205 GPa15 – 20 %ModerateMagneticGoodShear blades Needle valves Surgical equipmentLearn More
Stainless Steel
450 – 500 MPa200 – 280 MPa200 GPa20 – 24 %GoodMagneticGoodLow cost sinks Refrigerators Stove element supports Scientific apparatus Fasteners Flue liningsLearn More
Stainless Steel  440C560 – 800 MPa340 – 430 MPa204 – 215 GPa14 – 18 %ModerateMagneticPoorGage blocks Ball bearings and races Molds and dies Valve components Measuring instrumentsLearn More
Stainless Steel
17-4 PH
790 – 1200 MPa520 – 860 MPa197 – 207 GPa3 – 16 %ExcellentMagneticModerateAerospace applications Base plates Chemical processing equipment Oil and petroleum refining equipment Nuclear componentsLearn More

Stainless Steel CNC Machining Surface Finishes

Stainless Steel CNC Machining Gallery

Cost-saving Design Tips

To reduce the cost of stainless steel alloys, below are some design tips:

1.Choose the right alloy

Not all stainless steels are equal in price. Make sure that the picked material is fit for the application. These metals are usually optimal in harsh environments yet not all are resistant to the exact same chemicals. 


Some stainless steels are much more machinable than others. When only light deterioration resistance is required, take into consideration making use of free-machining stainless steel to minimize machining prices.


The 300 series family (303, 304, etc.) is austenitic stainless steel. Austenitic stainless grades exhibit high corrosion resistance and strength across wide temperature ranges. They are not heat-treatable except by cold working and are generally non-magnetic.

400 series stainless steels are in the martensitic family. Due to their higher carbon content, martensitic steels are extremely strong and tough but more susceptible to corrosion in specific environments. They can be heat-treated to increase their hardness greatly and are magnetic.

303 stainless steel is the easiest to machine. It maintains good corrosion resistance for industrial machining parts. 303 stainless steel is easily modified, making it ideal for a variety of parts, such as screws, nuts, bolts, gears & shafts.

Thin walls require extra care when CNC machining stainless steel. The absolute minimum thickness is 0.5mm for metals. To minimize costs and machining time, it’s recommended to increase the thickness of thin walls to at least 0.8mm. Unless weight is a determining factor thicker walls are more stable and less costly. Thin features are susceptible to vibration, creating extra complexity and requiring considerably more time in machining operations.

Yes, stainless steels tend to be one of the most difficult metals to work with in CNC machining. Stainless steel gets harder over time, instead of wearing, which combined with the high-heat generation in machining stainless steel, can contribute to tool failure. Getting speeds and feeds right as well as proper tooling is key.

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