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440C (UNS designation S44004) is a martensitic 400 series stainless steel, [1] and has the highest carbon content of the 400 stainless steel series. It can be heat treated to reach hardness of 58 to 60 HRC. It can be used to make rolling contact stainless bearings, e.g. ball bearings and roller bearings. It is also used to make knife blades.
[7] 420A (420J1) and 420B (420J2) are economical, highly corrosion-resistant stainless steel grades. Knife manufacturers use this material in budget knives, also in diving knives due to its high corrosion resistance. [7] 440 series has three types: 440A, 440B, and 440C. 440A is a relatively low-cost, highly corrosion-resistant stainless steel.
Samsung; Sandoz watches; Schwarz Etienne; Sea-Gull; Sector; Seiko; Seiko Instruments; Seikosha; Sekonda; Shinola Detroit; Sinn; SSIH (previous holding company, now ...
Martensitic stainless steels can be high- or low-carbon steels built around the composition of iron, 12% up to 17% chromium, carbon from 0.10% (Type 410) up to 1.2% (Type 440C): [8] The chromium and carbon contents are balanced to have a martensitic structure.
The Case Company is currently owned by Zippo Manufacturing Company, another business based in Bradford. [5] Case knives are made with blades usually stamped from domestic chromium-vanadium steel alloy or stainless steel, and hardened using proprietary heat treatment methods.
Joseph Fahys & Co is a watchmaker headquartered in New York. It was founded in 1857 by Joseph Fahys, a French emigrant. [1] Joseph Fahys & Co is most famous for their production of the Dust Proof Case [2] and the Magnetically Shielded Case during the 1880s. [3] The company's handmade gold and silver watches are sought after and highly ...