Stainless steel rod 321_ Price trend _ How much does it cost per square meter

Stainless steel rod 321_ Price trend _ How much does it cost per square meter

Common martensitic alloys, such as 410 type, have moderate chromium content, 12-18% Cr, low Ni, but more importantly, relatively high carbon content. The primary difference between austenitic and ferritic stainless steels and welded stainless steels lies in the potential hard HAZ martensitic structure and the matching composition of the welded metal. The data can be successfully welded, providing prevention methods to prevent cracking in the heat affected zone, especially for thick walled components and highly constrained joints.
Fundamentally, stainless steel with white spots is qualified in terms of heavy metal policies. The formation of white spots may be due to the modification of the protective film on the surface of the stainless steel by acid solution, resulting in defects, pores, or salt formation on the surface of the stainless steel plate; Dark rust spots are iron oxides formed by severe corrosion of iron in stainless steel. The above two types of stains are generally difficult to remove, and even if sandpaper is used to remove them, they will regenerate after a period of time. The main cause of stainless steel rusting is usually due to the iron contained in the steel. However, as long as there is an oxide protective film on the surface of the stainless steel material, the iron will not be exposed to the air, and in this situation, stainless steel will not rust easily.

Stainless steel rod 321_ Price trend _ How much does it cost per square meter

Dual phase stainless steel has a two-phase structure consisting of almost equal proportions of austenite and ferrite. The composition of general duplex steel is generally within the range of 22-26% Cr, 4-7% Ni, and 0-3% Mo, and a small amount of nitrogen (0.1-0.3%) is generally used to stabilize austenite. Modern duplex steel is easy to weld, but it is necessary to strictly follow procedures, especially adhering to heat input planning, to obtain the correct welded metal structure.

Although most welding processes can be applied, they generally prevent low heat input into the welding process. Preheating is generally not required, it is necessary to control the temperature between high-rise buildings. The selection of filler is important as it is planned to induce a ferrite austenite equilibrium to match the welded metal structure of the parent metal. To compensate for the loss of nitrogen, the packing can be mixed with nitrogen, and perhaps the protective gas itself can contain a small amount of nitrogen.