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What are the disadvantages of inferior stainless steel


Inferior stainless steel (usually refers to stainless steel products with substandard materials and rough workmanship, such as non-standard 201, recycled stainless steel, etc.) have obvious defects in performance, safety and durability, and the specific shortcomings are as follows: 1. Corrosion resistance is extremely poor and easy to rust Material defects: Inferior stainless steel contains insufficient chromium and nickel (for example, the nickel content of non-standard 201 stainless steel may be less than 1%, far less than 8% of 304), unable to form a stable passivation film (anti-corrosion "protective layer"), and is prone to oxidation and rust when exposed to water, humid environment, salt (such as soy sauce, sweat) or acid-alkaline substances (such as vinegar, detergent). Rust performance: red spots and rust spots appear on the surface after short-term use, and large-scale rust may appear in a long-term area, or even holes, affecting the appearance and structural stability (for example, inferior stainless steel sinks may leak due to rust). Second, the strength is low, easy to deform and break Many impurities and poor process: Inferior stainless steel is mostly smelted from recycled waste, and the material purity is low, containing more impurities (such as carbon, sulfur, etc.), resulting in insufficient hardness and toughness. Use problems: In daily use, it may be deformed and dented by slight collision, squeezing or high temperature (such as near the stove); If it is used for load-bearing (such as stainless steel shelves, lockers), it may collapse due to insufficient strength; Thin, low-quality stainless steel products (e.g., bowls, basins) can even be cut by sharp cutlery. Third, the safety is worrying, and harmful substances may be released Heavy metals exceeded: Recycled stainless steel may contain heavy metals such as lead, cadmium, mercury, etc., or the precipitation of chromium, nickel and other elements due to poor smelting process exceeds the standard. When in long-term contact with food (such as low-quality stainless steel tableware and water cups), harmful substances may migrate into the food and endanger human health (especially for children and pregnant women). No food-grade guarantee: Low-quality stainless steel is not "food-grade" certified and cannot come into direct contact with foodstuffs, even when used in non-food contact scenarios (such as lockers), which can cause odors or pollute the environment due to rust.

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