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Stainless steel 304 front door grille
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andrwss
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 Feb 21 2024, 12:47 PM
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Getting Started
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QUOTE(LA773 @ Feb 21 2024, 09:53 AM) Why say so? I see quite many of theirs neighbour also use SS, probably 30-40% there But some maybe cheaper grade, 2k+, after few yrs seems very dull colour, lower grade i guess Low grade like 201 202 430 etc all easy to rust, need at least 301 304 to last long, 316 is best but really rare. Quality also depends on thickness, spot weld vs full weld etc |
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andrwss
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Feb 23 2024, 04:27 PM
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Getting Started
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QUOTE(dest9116 @ Feb 21 2024, 02:03 PM) Also beware or China "304“ for layman easiest is use strong Magnet to check, 304 ss is not magnetic Some ss 304 can become slightly magnetic through cold working...china 304 is not 304 at all and cannot be classified under international standard SUS304/18Cr8Ni. Those stainless steel with strong magnetic most likely is chrome plated steel, which is not stainless steel at all. The easiest way to identify stainless steel grade is using battery + test liquid, or the most accurate way by spectrometer. |
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andrwss
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Feb 23 2024, 04:29 PM
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Getting Started
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QUOTE(LA773 @ Feb 21 2024, 12:54 PM) spot weld vs full weld? Full weld means totally all joint surfaces will be welded? Yes..spot weld is welding at side only, full weld is fill all the gap so water cannot go in when u wash or spray water, else water will trap inside |
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andrwss
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Feb 23 2024, 04:48 PM
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Getting Started
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QUOTE(Maknusia @ Feb 23 2024, 04:36 PM) I dont think its fair to put a blanket statement saying, they are not SS, kan. My cloth hanging that I bought from China, 20 years ago, its still in very good condition. One piece is on balcony and the other is expose outside in our garden. No rusting or fading at all. China manufacture international standard SUS304 also, big factory usually carve marked their grade. In china there are "normal 304" "non standard 304" etc which u should differentiate from SUS304. If your stainless steel used outdoor that can last long then it must be at least 301/304. |
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