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What Are The Differences Between 304 Stainless Steel Plate And 202 Stainless Steel

Feb 13, 2021

What are the differences between 304 stainless steel plate and 202 stainless steel? There are 3 differences between 304 stainless steel and 202 stainless steel:


1. The physical properties of the two are different:


1. The physical properties of 202 stainless steel: tensile strength is 520MPa, yield strength is 275MPa, elongation is 55-60%, elastic modulus is 203000MPa, hardness requirement (Brinell hardness) HRB<183N/mm2 (MPa).


2. Physical properties of 304 stainless steel plate: tensile strength ≥515~1035MPa, conditional yield strength ≥205MPa, elongation ≥40%, hardness ≤201HBW, density of 7.93g/cm3, melting point of 1398~1454℃, longitudinal elasticity The modulus is 193KN/mm2.


Outlook for the month: Resonance logic is still there, opportunity and risk are equally important. The outstanding performance of the steel industry in April is due to the large decline in the previous period and the continuation of the economy. The steel price and the recovery of gross profit have further consolidated the foundation of the industry. There is no need to worry too much that the recovery of industry fundamentals is not reflected in the performance of stock prices in the same proportion.


Heat resistance means that stainless steel can maintain its excellent physical and mechanical properties at high temperatures. Influence of carbon: Carbon is strongly formed and stable in austenitic stainless steel.


2. The two uses are different:


1. Purpose of 202 stainless steel: producing high-quality materials for various watch cases and watchband bottom covers. Mainly used to make decorative tubes, industrial tubes, and some shallow stretched products.


2. Uses of 304 stainless steel: widely used in industry and furniture decoration industry and food and medical industry, and also used to make equipment and parts requiring good comprehensive performance (corrosion resistance and formability).


In austenitic stainless steel, carbon is often regarded as a harmful element. This is mainly because carbon can form a high-chromium Cr23C6 type carbon compound with chromium in steel under certain conditions in the corrosion resistance of stainless steel, resulting in local chromium Depletion reduces the corrosion resistance of steel, especially the intergranular corrosion resistance.


3. The characteristics of the two are different:


1. The characteristics of 202 stainless steel: it has certain acid and alkali resistance, high density, no bubbles, no pinholes, etc.


2. The characteristics of 304 stainless steel plate: high temperature resistance of 800 ℃, good processing performance and high toughness. Since the 1960s, most of the newly developed chromium-nickel austenitic stainless steels have carbon content less than or ultra-low carbon type. It can be known that as the carbon content decreases, the intergranular corrosion sensitivity of steel decreases. When the carbon content is lower, it has obvious In effect, some experiments also pointed out that carbon will increase the tendency of pitting corrosion of chromium austenitic stainless steel.