Quality Characteristics of Stainless Steel
Release Date:
2022-06-23
Author:
Hengyuan Industry and Trade
In general, the required thickness tolerances for stainless steel products vary depending on their intended application. For example, Class II tableware and insulated cups typically demand tighter tolerances, around –3% to +5%, whereas Class I tableware usually calls for a tolerance of about –5%. Pipe products often require a tolerance of –10%, while materials used in hotel refrigeration cabinets are specified at –8%. Distributors’ tolerance requirements generally fall within the range of –4% to +6%. Moreover, differences between domestic and export markets can also influence customers’ specifications for material thickness tolerances. Export‑oriented customers generally impose stricter tolerances, while domestic manufacturers tend to accept more relaxed tolerances—often driven by cost considerations—and some even specify as tight as –15%.
Weldability
The requirements for weldability vary depending on the product’s intended use. For certain types of tableware, weldability is generally not a primary concern, even among some cookware manufacturers. However, the vast majority of products—such as second‑class tableware, insulated cups, steel pipes, water heaters, and water dispensers—require raw materials with excellent weldability.
Corrosion resistance
The vast majority of stainless steel products are required to exhibit excellent corrosion resistance, such as tableware and kitchenware of grades 1 and 2, water heaters, and water dispensers. Some overseas buyers even conduct corrosion‑resistance tests: they heat an NaCl aqueous solution to boiling, allow it to stand for a specified period, then discard the solution, rinse the samples, dry them, and measure the weight loss to assess the degree of corrosion. (Note: During polishing, iron‑containing abrasives—such as sandcloth or sandpaper—can cause surface rust spots during testing.)
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Quality Characteristics of Stainless Steel
In general, the required material thickness tolerances vary depending on the type of stainless steel product. For example, Class II tableware and insulated cups typically demand tighter tolerances, around –3% to +5%, whereas Class I tableware usually calls for a tolerance of –5%, and steel pipes require –10%. For materials used in hotel refrigeration cabinets, the thickness tolerance is specified at –8%.
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