Views: 1 Author: Site Editor Publish Time: 2020-08-06 Origin: Site
Stainless steel has many advantages, such as extreme durability and corrosion resistance, making it the precision machining of the material of choice.So what are stainless steel machining parts? Let's check.
The following knowledge points are listed below:
The basics of stainless steel machining parts
The quality of stainless steel machining parts
The types of stainless steel
Stainless steel is defined as alloy steel with a minimum chromium content of 10.5%. As the name implies, stainless steel is a steel that is not easily stained or corroded. There should be no stains, but it can't prevent dirt. It is generally considered to be corrosion-resistant, but considering various grades of stainless steel, this is not a very useful defining feature because its quality and grade determine its strength and corrosion-resistant stainless steel.
The basic element of stainless steel is iron (Fe), plus chromium (Cr), making it a corrosion-resistant alloy, an alloy of metal mixtures. Usually a small amount of carbon (C) is added to increase hardness and strength. Nickel can be added to stabilize the crystalline structure of iron, thereby improving the integrity at all extreme temperatures and contributing to corrosion resistance. Other alloying elements such as molybdenum (Mo) or titanium (Ti) can be added to improve heat resistance and corrosion resistance. That makes the metal suitable for make stainless steel machining parts.
One of the qualities of stainless steel machining parts is that it can repair itself after CNC machining. Chromium forms an invisible protective layer on the surface of iron through a process called passivation to protect the iron from air and water. If the surface is scratched, the protective layer will quickly rebuild in the presence of oxygen. This is why high-quality stainless steel will not rust even if scratches occur during processing. Most of the high-quality stock shape materials of brass parts are stress-relieved to ensure the highest degree of processing ability and dimensional stability.
Stainless steel is increasingly used in custom material processing, power generation, transportation and other applications. Good processing technology and advanced materials and insert technology can overcome the difficulties of austenitic stainless steel cutting.
(1) Alloy 303 is the easiest to process austenitic stainless steel; but the addition of sulfur makes the corrosion resistance of alloy 303 lower than that of alloy 304. Like other austenitic grades, it exhibits excellent toughness, although sulfur also reduces toughness a bit.
(2) 304 alloy austenitic stainless steel contains at least 18% chromium and 8% nickel. The maximum carbon content of Type 304 is 0.07%. It is a standard "18/8 stainless steel" and usually appears in pans and cooking tools. 304 alloy is the most widely used alloy in the stainless steel family. 304 alloy has excellent corrosion resistance, is easy to manufacture, has excellent formability after cnc processing, and is an ideal material for various home and commercial applications. Type 304/304L has good forming and welding performance. It does not harden after heat treatment. Austenitic stainless steel is also considered to be the most weldable high-alloy steel, which can be welded by fusion welding and resistance welding processes. The stainless steel is work hardened quickly, with heavy positive feed, sharp tools, and a rigid setting that cuts the forefront of the work hardening layer below.
(3) The 400 series group (such as 414) stainless steel has 11% chromium and 1% manganese increase, higher than the 300 series group. The 400 series is prone to rust and corrosion under certain conditions. Heat treatment can harden 400 series products. 400 series stainless steel has a high carbon content, making it have a martensite crystal structure. This provides high strength and high wear resistance after CNC machining. Martensitic stainless steel is not as corrosion resistant as austenitic stainless steel.
(4) The stainless steel with a PH value of 17-4 is a precipitation-hardened martensitic stainless steel with excellent oxidation resistance and corrosion resistance, which is comparable to 304 under most conditions or environments. Mechanical properties, such as strength and ductility, can be optimized by heat treatment. Because this alloy is hard, forming should generally be limited to gentle operations. However, by heat treatment before cold working or using a hot forming method, the formability can be greatly improved.