1.304Physical properties of stainless steel plates:

　　Tensile strength≥515~1035MPaConditional yield strength≥205MPaElongation≥40%Hardness≤201HBWThe density is7.93g/cm3The melting point is1398~1454℃The longitudinal elastic modulus is193KN/mm2.

　　Outlook for the month: The resonance logic remains, with equal emphasis on opportunities and risks4The outstanding performance of the steel industry in the month was attributed to the significant decline in the previous period and the continuation of the prosperity. The rebound in steel prices and the recovery of gross profit margins have further consolidated the foundation for the industry's rebound. What needs not be overly worried about is that the recovery of the industry's fundamentals has not been reflected proportionally in the performance of stock prices.5month

　　Heat resistance refers to the ability of stainless steel to maintain its excellent physical and mechanical properties at high temperatures. The influence of carbon: Carbon is strongly formed and stable in austenitic stainless steel.

　　202Physical properties of stainless steel: Tensile strength is520MPaThe yield strength is275MPaThe elongation is55~60%The elastic modulus is203000MPaHardness requirements (Brinell hardness)HRB<183N/mm2(MPa"

　　202The uses of stainless steel: producing high-quality materials for various watch cases, watch straps, and back covers, etc. It is mainly used for making decorative pipes, industrial pipes and some shallow-drawn products.

　　Ii.304The uses of stainless steel plates:

　　It is widely used in the industrial and furniture decoration industries as well as the food and medical industries, and is also used to make equipment and components that require good comprehensive performance (corrosion resistance and formability).

　　In austenitic stainless steel, carbon is often regarded as a harmful element, mainly because under certain conditions in the corrosion resistance application of stainless steel, carbon can form high-chromium with chromium in the steelCr23C6The formation of carbon compounds leads to the depletion of local chromium, thereby reducing the corrosion resistance of the steel, especially its resistance to intergranular corrosion.

　　202The characteristics of stainless steel: It has good acid and alkali resistance, high density, no bubbles or pinholes after polishing, etc.

　　Iii.304Characteristics of stainless steel plates:

　　High temperature resistance800℃It features excellent processing performance and high toughness.60Since the beginning of the year, most of the newly developed chromium-nickel austenitic stainless steels have a carbon content of less than or ultra-low carbon. It can be known that as the carbon content decreases, the intergranular corrosion sensitivity of the steel decreases. Only when the carbon content is lower than that will there be a significant effect. Some experiments also indicate that carbon will increase the pitting corrosion tendency of chromium-nickel austenitic stainless steels.

　　304What are the surface quality inspection methods for stainless steel plates?304Stainless steel watchbaiThe quality of the surface is mainly determined by the pickling work after heat treatmentduSequence, such aszhiThe surface oxide scale formed by the previous heat treatment process is thickdaoIf the structure is uneven, acid washing cannot improve the surface finish and uniformity. Therefore, full attention should be paid to the heating of heat treatment or the surface cleaning before heat treatment.

　　If304The thickness of the oxide scale on the surface of stainless steel plates is uneven. The surface finish of the base metal beneath the thick and thin areas is also different. Moreover, during acid washing, the dissolution of the oxide scale on the surface and the degree of erosion by acid on the base metal where the oxide scale adheres are different. Therefore, the surface of the steel plate is uneven. Therefore, during heat treatment heating, it is necessary to make it form an oxide scale evenly.