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What is the best finishing quality for galvanized sheets used in chillers

2003

Dear Sirs,

We are producing chillers and air handling units .We are using galvanized sheets in these products but we haven't formed an opinion about these standards. According to European Standard BS EN 10346 our galvanized steels number is DX51D+Z200-N-A-C DX51D ..... Tensile strength 270-500 N/mmÖ elongation %22

Z................ Coatings, Z is zinc it can be ZF(zinc-iron alloy)

200N/mmÖ.. Coating mass

N............... Coating finish, N is Normal spangle .It can be M (Minimized Spangle )R(regular zinc-iron alloy coating)

A................ Surface quality, A is as coated surface imperfections such as small pits, dark spots, etc.. B(Improved surface) C(Best quality surface)

C................ Surface treatment C is Chemical passivation it protects the surface against humidity and reduce the risk of formation of white rust. and also we want the sheets to be paint. So we send this standard number to our supplier and buy the steel. But we aren't sure that if it is the best solution for us. Especially for the finishings and surface qualities.The main problem is if these qualities and finishings are enough for our galvanized steels using in our products or it is unnecessary to order them with that qualities. If you have any idea or an advance for these problems and any idea for quality,finishing,coating mass and etc.for galvanized sheets to be used in chillers and air handling units frames I would be very glad.

Thanks in advance,

Bekir Peker
- Istanbul

I want to know what is DX51D+Z mean? or stand for ?

Waleed Mohamed
buyer - Egypt
June 19, 2008