Manufacturing with stainless steel offers many of the benefits of steel without rusting and corrosion. The chemical composition of stainless steel includes at least 10.5% chromium, as well as iron, nickel and manganese. When exposed to air, the chromium in stainless steel oxidizes, forming a protective layer that is highly resistant to moisture and corrosion. There are many types of stainless steel, each classified according to its molecular composition and structure.
Stainless Steel Type 201/201L
Type 201 stainless steel has a lower nickel content than other stainless steel blends. This makes it cheaper, but also less resistant to corrosion. The higher manganese content makes stainless steel 201 stronger than other blends, maintaining strength and dimensional stability even in extremely cold environments. It is an excellent choice for durable, inexpensive components in cold applications where corrosion is minimal.
Stainless Steel Type 316/316L
Type 316 stainless steel is characterized by its higher nickel and molybdenum content. Type 316 is extremely resistant to corrosion and moisture compared to other stainless steel alloys, but is also more expensive due to its high nickel content. Its resistance to salt water and chlorides is particularly good, which makes it useful for marine components, stainless steel floats, and medical equipment.
Stainless Steel Type 409
Stainless Steel 409 is a temperature resistant blend of stainless steels with higher iron content. This ferritic stainless steel contains 11% chromium for good corrosion resistance. Its greatest benefit, however, is its ability to withstand extremely high temperatures. Although Type 409 has higher corrosion resistance than coated iron alloys, its corrosion resistance is lower than most other stainless steels. Prolonged exposure to moisture or corrosive elements may eventually develop light rust.
AM350 Stainless Steel Alloy
AM350 is a stainless steel alloy containing nickel, chromium and molybdenum. Unlike other stainless steel blends, AM350 can be heat treated to improve formability or strength as required by the application. The heat treatment processes used to enhance AM350 include annealing, hardening, sub-zero cooling and dual aging. Annealed AM350 exhibits a higher degree of formability while maintaining good strength and corrosion resistance.
Alloy 20 is a unique blend of nickel, iron and chromium with niobium stabilizer. The unique chemical composition of Alloy 20 makes it particularly resistant to corrosion, especially when faced with aggressive chemicals. Its ability to withstand extreme corrosion makes it ideal for a variety of harsh application environments, including:
- Chemical and petrochemical processing
- Food, Beverage and Dyestuff Production
- heat exchanger
- Tanks and Valves
- Synthetic Rubber and Plastic Manufacturing
- SO2 scrubbers and other extreme environments
Stainless steel has many unique advantages over other materials, but these properties can make it a challenge for deep drawing metal stampings. Drawing stainless steel requires more force than other common drawing materials because it work hardens faster. In addition, the chromium oxide layer that gives stainless steel its characteristic corrosion resistance also creates a higher level of friction between the steel and the mold, which also results in the need for greater force.
When executed properly, stainless steel wire drawing produces products and assemblies with high corrosion resistance, excellent tensile strength, and excellent resistance to a wide temperature range.
Common components and applications of deep-drawn metal stampings
Deep drawing is a metal fabrication process that involves the use of dies and punches to create components from sheet metal. The deep drawing process is characterized by the creation of products and components that are deeper than their diameter. The repeated impact of the punch will force the material into the shape of the die, resulting in a durable hollow, box or cylindrical part. Deep drawing is used to manufacture components from a variety of materials, including aluminum, copper, brass, steel, and stainless steel.
The main benefit of deep drawing is the speed at which the equipment can be used. This highly versatile process can be used to manufacture a variety of components, from simple cylinders to complex shapes for special applications. The seamless nature of the deep-drawn product makes it hermetic and waterproof, and the compression process produces an exceptionally strong component with a hardened crystal structure.
Stainless steel drawing process
Stainless steel is increasingly popular for its beautiful and bright appearance, oxidation resistance, corrosion resistance and high temperature resistance, and its output is growing rapidly. However, the research on its forming process and lubricating measures is not deep and systematic enough. The forming process of stainless steel drawing parts depends on the complexity of the workpiece. No matter whether the process is complicated or not, it needs to be stretched many times. Many people ask why it needs to be stretched many times?
- Multiple stretching can greatly improve the overall elongation system and production efficiency, and ensure product accuracy through multiple uniform stretching.
- Only in this way can the amount of scrap be reduced. One-time molding requires technology. If it is not pulled well, it will be scrapped. Multiple stretches can be pulled evenly.
- This is for stress relief in the middle, annealing and softening, and it is not easy to produce waste products.
Several problems encountered in stainless steel stretching:
- There is a lump on the surface of the workpiece, piece by piece;
- The surface of the workpiece is drawn, stretched, and one by one, which seriously affects the smoothness;
- What’s more serious is to pull the crack directly;
- There is too much oil remaining on the surface of the workpiece, which is not easy to clean;
- The mold heats up too fast and wears more.