Chinese Stainless Steel

Postby lari » Thu Mar 02, 2017 13:24

hi,
just want to share my latest experience with chinese made SS pipe fittings. bought this little gem recently, advertised as 304 stainless. when cleaning it for the first time with "bar keepers friend" it started to show its true colours, literally.
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shiny
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2.jpg
yellow
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3.JPG
rust inside
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Re: Chinese Stainless Steel

Postby Kev888 » Thu Mar 02, 2017 15:31

Nothing is impossible, but it could be that the stainless steel itself is fine, yet the manufacturing process wasn't; e.g using steel tools and/or not passivating it afterwards. Even good stainless can rust (and stain) in the wrong conditions.

If you can get rid of the rust and then passivate it, you could possibly rescue the piece. For chemical removal, there is stuff called pickling paste which will eat away the iron and rust at the surface, but its harsh and expensive to get hold of in small quantities. 10% phosphoric acid, or the oxalic acid in bar-keepers friend may be enough. You could use something like scotchbrite to rub away the worst of the rust first (don't use iron/steel based things, like wire wool).

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Re: Chinese Stainless Steel

Postby INDIAPALEALE » Fri Mar 03, 2017 08:23

Ss Brewing Technologies information sheet says never use Barkeepers Friend on their stainless equipment. They also say that it is necessary to passivate anually. Could it be that they are using Chinese stainless?
Strangely enough Speidel do not give this advice with their products and I have been using them for six years with no problems. You pay your money and get what you paid for.

"You're not drunk if you can lie on the floor without holding on." Dean Martin
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Re: Chinese Stainless Steel

Postby lari » Fri Mar 03, 2017 08:58

i use BKF on all new items. it helps me identify dodgy products. if a supposedly stainless steel equipment can’t handle BKF which is an acid based cleaner specifically designed for stainless steel then i will not use that peace of equipment in my brewery.
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Re: Chinese Stainless Steel

Postby jkp » Fri Mar 03, 2017 09:44

Isn't BKF also supposed to be good for getting rid of rust?

The second photo looks like it's made of copper. Have you talked to the seller about this?

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Re: Chinese Stainless Steel

Postby lari » Fri Mar 03, 2017 17:40

received two more 'stainless steel' fittings. after cleaning it appears yet another one is dodgy, the other is grand. heres the full set:
notice only one of them has 304 stamped.
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the good the bad and the ugly
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Re: Chinese Stainless Steel

Postby PhatFil » Fri Mar 03, 2017 20:31

its a double wammy since the chinese orders take weeks to fill
name n shame the seller, may help others avoid the same trap.

fwiw bes.co.uk have always supplied good bits to me:)
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Re: Chinese Stainless Steel

Postby HTH1975 » Fri Mar 03, 2017 21:59

I got all my SS fittings from a LHBS in Darlington - all top notch stuff that hasn't budged in over a year of regular service.

2016: 330L brewed (72 gallons, over 8 firkins)
2017: 105L brewed (need to update this figure)
Drinking: Landlord clone
Conditioning: ciders from 2016, hedgerow barrolo, 1914 Courage RIS (10%).
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Re: Chinese Stainless Steel

Postby HTH1975 » Fri Mar 03, 2017 22:04

From a five minute google search, it appears that citric acid is very good for passivating stainless steel. I have some here that I bought by accident. Might be worth a try.

2016: 330L brewed (72 gallons, over 8 firkins)
2017: 105L brewed (need to update this figure)
Drinking: Landlord clone
Conditioning: ciders from 2016, hedgerow barrolo, 1914 Courage RIS (10%).
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Re: Chinese Stainless Steel

Postby DWB » Thu Mar 09, 2017 19:21

It's commonly know as Crapolium in the brewery trade lol! :D
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Re: Chinese Stainless Steel

Postby lari » Thu Mar 30, 2017 18:48

and another one
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