What specification does medical stainless steel pipe fittings have commonly?

Stainless steel is roughly composed of iron and chromium and carbon and other elements.

2 series: martenite + manganese alloy, 3 series: Austenite + nickel alloy, 4 series: ferrite + carbon alloy

Household stainless steel can be divided into 4, 3 series, 430 (18-0), 304 (18-8), 316 (18-10) three grades. The number before the code indicates chromium content and the number after it indicates nickel content.

430 stainless steel (18-0) : iron +18% chromium nickel free, can prevent oxidation caused by natural factors, known as stainless steel, jis code for 430, so also known as 430 stainless steel. Unable to resist oxidation caused by chemicals in the air, 430 stainless steel is not often used for a period of time, there will still be oxidation (rust) due to unnatural factors. 4 series of carbon containing stainless steel, hardness is higher than 2 series and 3 series, corrosion resistance is lower than 3 series, difficult processing, stretching easy to fracture.

304 stainless steel (18-8) : iron +18% chromium +8% nickel, can resist chemical oxidation, this stainless steel in JIS code 304, so also known as 304 stainless steel; 304 is the material that must be used in the national pressure cooker standard, and the standard material of stainless steel pressure cooker is above 304 (because there is the national material standard for pressure cooker, which is formulated to prevent the explosion of pressure cooker, by the way, the material is also standardized).

316 stainless steel (18-10) : but the chemical composition in the air is more and more, some of the more serious pollution places even 304 will have rust; So some advanced products will use +18% chromium +10% nickel to make it more durable more corrosion resistant, no metal ions precipitation, this stainless steel is called 18-10 stainless steel. Some tableware instructions say something like "using 18-10 state-of-the-art stainless steel for medical use."

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