Decoufle Nano Final Cutter For Cigarette Filter Cutting
Filter Knife is a component of cigarette making machines to slice
filter rod after being connected to cigarette rod.
Heat Treatment Of Martensitic Stainless Steels
Austenitizing, where the steel is heated to a temperature in the
range 980–1,050 °C (1,800–1,920 °F), depending on grade. The
resulting austenite has a face-centered cubic crystal structure.
Tempering. Martensite would be heated to around 500 °C (932 °F),
held at such high temperature, then air-cooled. Higher tempering
temperatures decrease yield strength and ultimate tensile strength
but increase the elongation and impact resistance.
Quenching. The austenite is transformed into martensite, a hard
body-centered tetragonal crystal structure. The quenched martensite
is too hard and brittle for most applications. Some residual
austenite may remain.
Ferritic Stainless Steels
Ferritic stainless steels possess a ferrite micro-structure like
carbon steel, which is a body-centered cubic crystal structure, and
contain between 10.6% and 27.2% chromium with very little or no
nickel. They are magnetic.
This micro-structure is present at all temperatures due to the
chromium addition, so they are not hardened by heat treatment. They
cannot be strengthened by cold work to the same degree as
austenitic stainless steels.
Invention
Robert Bunsen discovered chromium's resistance to strong acids. The
corrosion resistance of iron-chromium alloys may have been first
recognized in 1821 by Pierre Berthier, who noted their resistance
against attack by some acids and suggested their use in cutlery.
In the early 1800s, James Stodart, Michael Faraday, and Robert
Mallet observed the resistance of chromium-iron alloys ("chromium
steels") to oxidizing agents.
The invention of stainless steel followed a series of scientific
developments, starting in 1798 when chromium was first shown to the
French Academy by Louis Vauquelin.
