Brand shop: water pipe
A magnetic test
Magnetic testing is the easiest way to distinguish between annealed austenitic stainless steels and ferritic stainless steels. Austenitic stainless steels are non-magnetic steels, but will have mild magnetic properties after cold working under high pressure; pure chrome and low alloy steels are ferromagnetic steels.
Second, nitric acid test
A notable feature of stainless steel pipes is their inherent corrosion resistance to concentrated nitric acid and dilute nitric acid. This property makes it easy to distinguish from most other metals or alloys. However, high-carbon 420 and 440 steels are slightly corrosive when tested with nitric acid, and non-ferrous metals are immediately corroded when they encounter concentrated nitric acid. Dilute nitric acid has a strong corrosive effect on carbon steel.
Three, copper sulfate point test
The copper sulfate point test is the easiest way to quickly distinguish between plain carbon steel and all types of stainless steel. The concentration of the copper sulfate solution used is 5 to 10%. Before conducting the point test, the test area should be thoroughly cleaned of grease or various impurities, and a small area polished with a soft cloth, and then drop the bottle of copper sulfate solution to the cleaned area. Ordinary carbon steel or iron will form a layer of surface metal copper in a few seconds, while the surface of stainless steel will not produce copper precipitation or show the color of copper.
Fourth, sulfuric acid test
The sulphuric acid immersed stainless steel test can distinguish 302 and 304 from 316 and 317. The cut edge of the sample should be fine ground and then cleaned and passivated for half an hour in nitric acid (specific gravity 1.42) at a volume concentration of 20 to 30% and a temperature of 60 to 66C. The volume concentration of the sulfuric acid test solution was 10%, heated to 71°C. When 302 and 304 steels were immersed in this hot solution, they were rapidly corroded and produced a large amount of bubbles, and the samples turned black within a few minutes; while the 316 and 317 steels The sample is not corroded or the reaction is slow (no bubbles are generated) and the sample does not change color within 10 to 15 minutes. If an approximate comparison is made by testing samples with known compositions at the same time, the test can be made more accurate.
Links: Qijia expert teaching: selection and classification of plumbing materials
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Our Stainless Steel DIN Sanitary Pipe Fittings includes sanitary elbow, sanitary tee, sanitary reducer, with Welded, Tri-Clamped, Threaded ends, which is used in food, milk, beer, brewage, pharmacy, comestic, biopharmacy, etc. Material in SS304 & SS316L, Standard including 3A, DIN, SMS, BS, RTJ, ISO, IDF, DS, INCH, etc,size from 1/2" to 12".
Kaysen Steel is a China manufacturer, supplier and exporter for Stainless Steel Sanitary Pipe Fittings, DIN Sanitary Pipe Fittings, DIN Hygienic Fittings, DIN food grade fittings.
Sanitary Pipe Fitting Specification:
â–ª Standard:3A, DIN, SMS, BS, RTJ, ISO, IDF, DS, INCH, etc
â–ª Material: Stainless Steel 304 (1.4301), Stainless Steel 316L(1.4404) etc.
▪ Size Range: 1/2″ to 12″ / DN15 ~ DN300
â–ª Connection Type: Welded, Tri-Clamped, Threaded
Surface Finish:
Mechanically polished and electropolished are available for our products. Outside and Inner surface can be treated complied to specified needs, and to meet FDA, GMP requirement.
Tube and Fittings: Ra0.4, Ra0.6, Ra0.8 or specified ( 180grit, 240grit, 300grit, 400grit, mirror polished, sandblasting finish, brushed finish etc.)
Both outside and inner available.
Quality & Inspection:
â–ª PMI test to verify material grade
â–ª Dimension controlling during fabricating and finished
â–ª Visual and surface 100% examination before shipment
â–ª Packed in carton box firstly, then in wooden case
Strength:
â–ª Material of stainless steel 316L and 1.4404 is from reputed mill to guarantee the chemical composition and mechanical properties.
â–ª Fast delivery is possible to meet your needs well in time.
â–ª Low cost from bulk production will reduce your budget and improve your business.
â–ª Small quantity available.
â–ª OEM is available.
â–ª Material certificate is traceability.
Din Sanitary Pipe Fittings,Din Sanitary Fittings,Din Hygienic Fittings,Din Fittings
Kaysen Steel Industry Co., Ltd. , https://www.chinasanitaryvalve.com