Stainless Steel 304 Machined Parts
Stainless Steel 304 Machined Parts is a component or assembly that has been manufactured by machining. Stainless steel is a hard and viscous material. In terms of processing complexity, it is about three times superior to softer metals, like aluminum. This means that in order to make a part from stainless steel, the machine must make three times as many passes. And the tool, which performs processing, wears out faster. But this is not a problem for us.
Stainless steel 304 is the most common stainless steel. It is essentially non-magnetic steel and it is less electrically and thermally conductive than carbon steel. It is wildly used because it is easily formed in various shapes. It is machinable and weldable. Other names for this steel are A2 stainless steel, 18/8 stainless steel, UNS S30400, and 1.4301. 304L stainless steel is the low-carbon version of stainless steel 304.
What kind of Stainless Steel 304 Machined Parts we can offer?
Stainless Steel 304 Machined Parts Applications
CNC machining of stainless steel is used to produce a variety of parts in the medical industry, robotics, food and beverage industry, aerospace, and any industry that requires high-strength applications. Stainless steel is an ideal material for applications such as:
- Medical instruments
- Home appliances
- Storage containers
- Pressure tanks
- Automotive parts
- Machine parts
- Parts for tractors
- Heavy construction equipment
- Vacuum and pressure vessels
- Bolts and nuts
Stainless steel provides excellent machinability, and outstanding uniformity, and is corrosion and oxidation resistant, leading to longer product life and lower total cost of machined parts.
Benefits of Stainless Steel 304 Machined parts
- Processed for improved machinability
- Outstanding uniformity
- Faster machining speeds
- Longer tool life
- Improved part surface quality
- Corrosion resistant
- The lower total cost of machined parts
3 featured things before we design and produce stainless steel 304 machined parts
1. Material Name
- Stainless steel 304/304L ,1.4301/1.4307
- Alternative names X5CrNi18-10, 1.4301
2. Mechanical & Chemical Properties
- Chromium content: 16-20.0%
- Nickel content: 6-15%
- Molybdenum content: 2-4%
- Ultimate tensile strength: 520-600 MPa
- Typical max Hardness: 180 HB
- Yield strength: 210-250 MPa
- Elongation at break: 43-45 %
- Electrical resistivity: 65 – 70 μΩ*cm
- Maximum service temperature: 750 – 925 °C
- Thermal expansion coefficient: 10.3 – 12 10^-6/ºC
- Thermal conductivity: 29.3 – 31.7 W/(m⋅°C)
- Corrosion resistance: Good
- Magnetism: No
- UV resistance: Excellent
3. Post treatments
- Post-Processing: Annealing & Cold working
- Anodizing compatibility: Not suitable
- Weldability: Excellent
What to keep in mind when designing stainless steel 304 machined parts
Most of the equipment for the food and processing industries is made of stainless steel. This is really excellent material, both visually and from an engineering point of view. For a long time, it is being used in the manufacturing of refrigerators, dishwashers, deep fryers, etc. Among the main benefits of this material are high corrosion resistance, durability, and compliance with hygienic requirements. However, engineers who use it also can face unique challenges. We will tell you about them.
Corrosion resistance strongly depends on the type of stainless steel
303 stainless steel is best at handling and gives a significant price benefit due to the fact that its processing is less time-consuming and it affects the wearing of tools a bit less than other materials.
Most branches of the food industry use steel 301 and 304 series. These are the most common types of stainless steel. Due to high demand, their prices are constantly fluctuating. During the year alone, the cost can rise or fall up to 25%. This is caused by fluctuations in world prices for nickel, which is one of the main components of stainless steel alloys.
Take into account the class of corrosion resistance and other qualities of the metal. And also, speaking about the price of the material, it is always better to pay attention to the actual purposes of the purchase. For example, if the parts are going to be used only for decoration, then there is no point in using the material from the high price segment, better to use a less expensive one.
Problems of connecting stainless steel 304 machined parts
Stainless steel welding is a complex process. And when it comes to a combination of parts made of different types of stainless steel, a number of certain issues tend to appear. It is quite difficult to weld any part with another and preserve its original properties. Only highly qualified workers need to be involved. Otherwise, you may choose to use more expensive technology, such as robotic laser welding.
The biggest problem here is to provide sufficient resistance to corrosion of the weld. Therefore, it is better to include other types of connections to the project at its development stage. A threaded connection is most often used with stainless steel. Please note that the polished surface of stainless steel, despite making it beautiful and durable, significantly complicates the process of connecting with other parts.
That is why most of the manufacturers of equipment for the food industry deliberately design some elements that should provide access to internal mechanisms, and prefer ordinary carbon steel to stainless steel.
Possibility of replacement by other materials
It is not an easy task to find a material that would not be inferior to stainless steel in terms of aesthetic qualities, strength, and corrosion resistance. Carmakers usually use carbon fiber, while manufacturers of equipment for restaurants – alloys of non-ferrous metals. We recommend you consider making parts from less expensive grades of steel or aluminum, together with the subsequent anodizing.
Any more interesting ideas, please feel free to share them with us. Please send your designs or drawings directly to our mailbox: [email protected].
Frequently Asked Questions
The following parts are a good fit for CNC turning:
Rotary parts with high precision requirements.
Rotary parts with complex surface shapes.
Rotary parts with lateral machining.
Ultra-precision and ultra-low surface roughness parts.
Parts with special threads.
The main costs related to CNC machining can be divided into machining time, start-up cost, material cost, and feature cost. To reduce costs, you need to understand the impact of these factors on costs.
– The best way to reduce machining time is to design features that can be processed quickly, such as by selecting the correct inner corner radius, reducing the cavity depth, increasing the wall thickness, limiting the thread length, and designing holes of standard size.
– The material cost can be reduced by considering the size of the required blank and the cost and machinability of bulk materials (softer alloys process faster).
– Start-up costs can be reduced by reducing the number of part rotations or repositioning required to complete the part, such as dividing the geometry into multiple parts that can be assembled later.
– Using tolerances only when strictly necessary, deleting all text and letters, and avoiding multiple surface treatments can reduce feature costs.
Read more detail in our complete guide on how to reduce the cost of CNC machining parts.
CNC turning is used for creating a variety of parts, including auto parts, knobs, tubes, gears, toy parts, flywheels, crankshafts, hubs & disc cams. It is most often used to manufacture CNC parts online for automotive, aerospace, medical, and other industries.
CNC turning center, the equipment or machines for CNC turning service, is a computer-controlled 3, 4, or 5-axis machine that has capabilities of turning, drilling, tapping, and milling, using live tools with powered rotary tool turret, dual spindles, Y-axis, and multiple turrets. While the CNC lathe machine is a simpler 2-axis with one spindle, basically composed of headstock, carriage, tailstock, and bed.
– CNC turning centers have more complex structures than CNC lathes.
– CNC turning centers have higher production capabilities and versatility than CNC lathes.
– CNC lathes are generally flat-bed type while turning centers are usually slant-bed type.
– There are only minimal protective enclosures around the lathe while the turning center is commonly equipped with full enclosures to keep chips and coolant splashes within the machine.
Heat treatments can be applied on precision CNC turned parts to improve their key properties such as hardness. Heat treatment can be applied to metal parts throughout the manufacturing process.
– Hardening: used to harden the material and make it stronger, also decreases the ductility.
– Annealing: heats metal parts to a very high temperature and then slowly cools to achieve the desired microstructure.
– Normalizing: used to relieve internal stresses that were created during machining service.
– Quenching: heating the metal to a very high temperature, followed by a rapid cooling step.
There are many types of CNC turning operations for CNC lathe services that can be performed on a live tooling lathe in CNC turning factory, including Hard turning, Parting, Facing, Boring, Reaming, Taper turning, Drilling, Knurling, Threading, Grooving, etc., comes in varying tools, cost and set-up time.
– Tapered turning: produce a cylindrical part of which diameter decrease from one end to another.
– Hard turning: suited for materials with a Rockwell C hardness greater than 45, typically performed after heat treated.
– Spherical generation: create a spherical finished surface, turning around a fixed rotary axis.
– Facing: a turning operation in which the workpiece is machined to its center.
– Parting: create deep grooves that remove a completed or part-complete component from its parent stock.
– Grooving: similar to parting, but only cut to a specific depth from outside or inside of the workpiece.
– Drilling: remove materials to drill holes from the inside of a workpiece with drill bits held stationary in the tailstock or tool turret of the lathe. Boring: enlarge or smooth an existing hole.
– Knurling: cut a serrated pattern onto the surface of the workpiece with a knurling tool, to change or enhance the visual effect or hand grip.
– Reaming: remove a small volume of materials from a drilled hole, for highly accurate diameters.
– Threading: turn standard and non-standard screw threads, which generally means single-point threading.
– Polygonal turning: non-circular forms machining operation without interrupting the rotation of the raw material.
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