CNC Machining Stainless Steel
What is stainless steel?
Stainless steel is an alloy steel with corrosion resistance, usually composed of iron, chromium and nickel. The main characteristics of stainless steel are high corrosion resistance, high heat resistance and good processing properties, but also has a beautiful appearance and good mechanical properties.
Among them, chromium is one of the most important elements in stainless steel, its main role is to form a dense layer of chromium oxide on the surface of the steel, making the surface of the steel less susceptible to corrosion. At the same time, nickel can also improve the corrosion resistance of stainless steel, while other elements such as molybdenum and vanadium can improve the strength and hardness of stainless steel.
Stainless steels can be divided into many different types and grades depending on their composition, such as austenitic stainless steel, martensitic stainless steel, duplex stainless steel, etc. Different stainless steel materials also vary in terms of application areas and performance, and therefore need to be selected and used on a case-by-case basis.
CNC machining common stainless steel
| Stainless Steel Materials | Chemical composition | Characteristics | Applications |
| 303 | Chromium 18-20%, nickel 8-10%, carbon 0.15%, sulfur 0.15-0.35% | Good workability, low strength, general corrosion resistance | Manufacture of threaded rods, bolts, self-tapping screws, bearings, etc. |
| 304 | Chromium 18-20%, nickel 8-10%, carbon 0.15%, sulfur 0.15-0.35% | Good corrosion resistance, good plasticity, good processability | Manufacture of pressure vessels, chemical equipment, kitchen utensils, construction materials, etc. |
| 316 | Chromium 16-18%, nickel 10-14%, molybdenum 2-3% | Good corrosion resistance, good high temperature resistance, high tensile strength | Manufacture of seawater equipment, chemical equipment, paper making equipment, pharmaceutical equipment, etc. |
| 316L | Chromium 16-18%, nickel 10-14%, molybdenum 2-3%, low carbon | Good corrosion resistance, good high temperature resistance, high tensile strength | Manufacture of medical equipment, marine equipment, chemical reactors, storage tanks, etc. |
| 420 | Chromium 12-14%, silicon 1% or less, carbon 0.16-0.25% | Excellent wear resistance and corrosion resistance, high hardness | Manufacture of blades, knives, molds, etc. |
| 430 | Chromium 16-18% | Poor corrosion resistance, good plasticity, magnetic | Manufacture of kitchen utensils, home appliance equipment, automobile exhaust systems, etc. |
| 17-4PH | Chromium 15-17.5%, Nickel 3-5%, Copper 3-5%, Vanadium 0.15-0.45% | Corrosion resistance, high strength, good weldability | Manufacture of parts for pneumatic and aerospace applications, tanks, propellers, etc. |
| 301 | Chromium 16-18%, nickel 6-8% | Good strength and plasticity, excellent corrosion resistance | Manufacture of automobile and train body structures, construction materials, storage tanks, etc. |
CNC machining characteristics of stainless steel?
Stainless steel has some special CNC machining characteristics, mainly including the following aspects.
Higher hardness: the hardness of stainless steel is relatively high, so you need to choose a higher hardness of the tool and processing parameters to ensure the cutting effect and processing quality.
Poor plasticity: the plasticity of stainless steel is poor, so it is easy to produce large stresses and deformations during processing, and requires appropriate compensation and adjustment to ensure machining accuracy and dimensional accuracy.
Difficult to cut: stainless steel is more difficult to process, cutting is prone to higher cutting forces and frictional heat, so you need to choose a highly efficient cutting fluid and appropriate cutting parameters to reduce cutting forces and reduce cutting temperature.
Easy to produce scratches: stainless steel surface is more likely to produce scratches, so you need to choose the appropriate tool and processing parameters to reduce surface quality problems.
Easy to produce welding slag: stainless steel processing process is easy to produce welding slag, need to clean up in time to avoid affecting the processing quality and machine life.
The benefits of CNC machining of stainless steel?
There are many benefits of CNC machining of stainless steel, and the following are some common benefits.
High precision machining: CNC machining can achieve high precision machining, which can achieve higher machining accuracy and dimensional accuracy than traditional machining, while ensuring consistency and repeatability.
High production efficiency: CNC machining has high efficiency processing capability, which can achieve fast processing speed and efficient production, improving production efficiency and output.
Reduce labor costs: CNC machining can automate processing, reduce manual intervention and lower labor costs, while it can improve production efficiency and processing quality.
Increase product variety: CNC machining can be flexible and can quickly change the machining process and procedures, thus realizing multi-species and small batch production.
Improve machining quality: CNC machining can achieve high precision machining and consistency machining, which can ensure machining quality and product quality and reduce the rate of non-conforming products.
CNC machining stainless steel parts for the application of the industry?
Stainless steel CNC machining parts are widely used, mainly in the following industries.
Automotive manufacturing industry: stainless steel CNC machined parts are widely used in the automotive manufacturing industry, such as engines, bodies, suspension systems, etc.
Aerospace industry: stainless steel CNC machined parts are also widely used in the aerospace industry, such as aircraft engine parts, aircraft structural components, hydraulic systems, etc.
Medical equipment industry: stainless steel CNC machined parts are widely used in the medical equipment industry, such as surgical instruments, medical syringes, medical needles, etc.
Petrochemical industry: stainless steel CNC machined parts are also widely used in the petrochemical industry, such as storage tanks, pipelines, pumps and valves, etc.
Food processing industry: stainless steel CNC machining parts are widely used in the food processing industry, such as food processing equipment, manufacturing equipment, etc.
Electronic appliance industry: stainless steel CNC machining parts in the electronic appliance industry also has a wide range of applications, such as cell phone parts, computer parts, electronic components, etc.
Stainless steel CNC machining of common problems and solutions?
Stainless steel CNC machining process may appear some common problems, the following are some common problems and solutions.
Short tool life: stainless steel is hard and easy to wear, resulting in short tool life. The solution is to choose the right tool material and geometry, reduce the friction between the tool and the workpiece, use the appropriate cutting parameters, etc.
Processing difficulty: stainless steel processing hardness, high toughness, easy to produce tool folding edge, burrs and other problems, the processing is more difficult. The solution is to choose the right tool material, tool geometry and cutting parameters, and do a good job of workpiece surface treatment and cooling lubrication before processing.
The surface of the workpiece is not smooth after processing: stainless steel processing may appear burrs, scratches, oxidation and other problems, affecting the beauty and quality of the product. The solution is to choose the appropriate cutting parameters, cooling lubricants and tools, control the processing speed and feed rate, and do a good job of surface treatment before processing.
Noise during processing: Stainless steel processing may generate noise, affecting the working environment and health. The solution is to strengthen equipment maintenance and maintenance, choose the appropriate cutting parameters and cooling lubricants, use noise control devices, etc.
Large size deviation of the workpiece after processing: Stainless steel processing may have the problem of large size deviation of the workpiece, affecting the accuracy and quality of the product. The solution is to choose the right tool, cutting parameters and processing technology, improve the accuracy and stability of the equipment, strict monitoring and control of the processing process, etc.
In short, some problems may occur during the CNC machining of stainless steel, but as long as attention to detail, the selection of appropriate processes and tools, and strict monitoring and control, you will be able to solve these problems and ensure the quality of processing and product quality.
