321 stainless steel offers high resistance to corrosion in high temperatures and after welding
Unpolished (mill) surface has no finish
Meets ASTM A240 and AMS 5510 specifications
Cold finished to the specified dimensions
Annealed after shaping to modify the metal's properties
The 321 stainless steel sheet has an unpolished (mill) surface, has been cold finished and annealed, and meets American Society for Testing and Materials International ASTM A240 and SAE Aerospace Material Specifications AMS 5510 standards. The 321 stainless steel grade includes titanium for corrosion resistance in high temperatures and after welding. An austenitic stainless steel, 321 is typically nonmagnetic and can be cold worked to increase its hardness and strength while maintaining most of its formability. The sheet has been cold finished, a process of removing the outer layer to achieve the specified dimensions. It has been annealed to modify its properties after shaping.
Stainless steel is an iron alloy with resistance to staining and rusting in many environments where steel would typically degrade. The chemical composition of each grade creates a grain structure that falls into one of five classes: austenitic, duplex, ferritic, martensitic, and precipitation hardening. The austenitic class contains the most formable, weldable, and corrosion-resistant stainless steel grades, but they cannot be heat treated. The duplex class offers high resistance to pitting and chloride stress corrosion cracking. Duplex grades are heat treatable and roughly twice as strong as austenitic grades. The ferritic class contains moderately formable and corrosion-resistant grades compared to other stainless steel classes, but they cannot be heat treated. The martensitic class includes some of the hardest and strongest stainless steel grades that also offer mild corrosion resistance, high hardness, and good formability. Martensitic grades can be heat treated. The precipitation-hardening (PH) class can be heat treated after fabrication to achieve some of the highest hardness ratings in stainless steel.
Tensile strength, used to indicate the material’s overall strength, is the peak stress it can withstand before it breaks. Corrosion resistance describes the material's ability to prevent deterioration caused by atmosphere, moisture, or other medium. Wear resistance indicates the ability to prevent surface damage caused by contact with other surfaces. Toughness describes the material's ability to absorb energy before breaking, while hardness (commonly measured as indentation hardness) describes its resistance to permanent surface deformation. Formability indicates how easily the material can be permanently shaped. Machinability describes how easily it can be cut, shaped, finished, or otherwise machined, while weldability characterizes the ability to be welded. Magnetism characterizes how much the material is repelled by or attracted to a magnet.
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