Alloy: 440 | Material: Stainless Steel | Shape: Round Bar | Production Method: Cold Finish | Diameter: 0.8125 Inches | Item Length: 72 InchesStainless Round Bar 440C offers high strength, moderate corrosion resistant, good hardness and wear resistance. After heat treatment, 440C is capable of attaining the highest strength, hardness and wear resistance of all the stainless alloys. It is typically used in rolling element bearing, valve seats, high-quality knife blades, surgical instruments, chisels, gage blocks, cutlery, ball bearings and races, molds and dies, knives, valve components, measuring instruments. 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. UNS S44004, AISI 440C, Alloy 440C, Premar 440C, martensitic stainless steel This product weighs 10.53 pounds and meets the following specs: AMS-5630, AMS-QQ-S-763, ASTM-A276