What is the hardness of 416 stainless steel bars after heat treatment?
Martensitic stainless steel refers to the stainless steel that can be adjusted to its mechanical properties by overheating. It is, in general, a hardened stainless steel, typically of type Cr13. After quenching the hardness is higher, different tempering temperature has different strength and toughness combination, mainly used in steam turbine blades, tableware, surgical instruments.
Such stainless steel is also chromium as the main alloy elements (chromium, 10~18%), carbon in the range of 0.08~1.2%, the majority do not contain nickel, and a small amount of nickel (2.5%). Martensitic stainless steel heat treatment generally has the following processes:1, after annealing - hot rolling, because of the rapid cooling and hardening, in order to soften treatment, increase ductility, need to be annealed. The annealing temperature is 850~9200C, the furnace is cold to 6000C, then the air cooling is called full annealing, and is usually carried out in bell type furnace. The annealing temperature is 620~7800C, and then air cooling is called process annealing, which is usually carried out in a continuous furnace.2, quenching martensitic stainless steel can obtain very high hardness after high temperature quenching, its quenching temperature is 925~10650C, oil quenching or air cooling. In order to eliminate the internal stresses after quenching, general stress relief, annealing and tempering are also necessary. However, such treatment is generally used for bars and mechanical parts, and steel strips and steel plates are seldom used for such treatment.
Standard martensitic stainless steels include 403, 410, 414, 416, 416 (Se), 420, 431, 440A, 440B and 440C. They are magnetic and corrosion resistant.
416 stainless steel bar, or SUS416, is the standard martensitic stainless steel, the chemical composition and mechanical properties equivalent to the national standard of Y1Cr13. Higher carbon content can be heat treatment, the highest hardness of Rockwell hardness HRC50.
