Description
Stainless 308LSi Mig Wire 0.6 mm x 0.7Kg Reel
INTRODUCTION
Defined as iron base alloys, the stainless steels contain at least 10.5% chromium. These contain at least 10.5% chromium. The thin but dense chromium oxide film which forms on the surface of a stainless steel provides corrosion resistance and prevents further oxidation.
There are five types of stainless steels depending on the other alloying additions present, and they range from fully austenitic to fully ferritic.
TYPES OF STAINLESS STEELS
There are five types of stainless steels depending on the other alloying additions present, and they range from fully austenitic to fully ferritic.
TYPES OF STAINLESS STEELS
Austenitic stainless steels include the 200 and 300 series of which type 304 is the most common. The primary alloying additions are chromium and nickel. Ferritic stainless steels are non hardenable Fe-Cr alloys. Types 405, 409, 430, 422 and 446 are representative of this group.Martensitic stainless steels are similar in composition to the ferritic group but contain higher carbon and lower chromium to permit hardening by heat treatment. Types 403, 410, 416 and 420 are representative of this group. They contain roughly 24% chromium and 5% nickel. Precipitation hardening stainless steels contain alloying additions such as aluminium. This allows them to be hardened by a solution and aging heat treatment. They are further classified into sub groups as martensitic, semi austenitic and austenitic precipitation hardening stainless steels. They are identified as the 600-series of stainless steels (e.g., 630, 631, 660). Stainless 308LSi Mig Wire 0.6 mm x 0.7Kg Reel
WELDABILITY OF STAINLESS STEELS
Stainless steels are considered to have good weldability and may be welded by several welding processes. This includes the arc welding processes, resistance welding, electron and laser beam welding, friction welding and brazing. For any of these processes, joint surfaces and any filler metal must be clean. The coefficient of thermal expansion for the austenitic types is 50% greater than that of carbon steel and this must be considered to minimize distortion. The low thermal and electrical conductivity of austenitic stainless steel is generally helpful in welding. Less welding heat is required to make a weld because the heat is not conducted away from a joint as rapidly as in carbon steel. In resistance welding, lower current can be used because resistivity is higher. Alloying elements which appear in stainless steels are classed as ferrite promoters and austenite promoters.
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