Q235 steel for bicycle frames?

Cianos · 20-03-2010 10:03PM #1

Hi guys,
I was wondering would anyone know what the quality is like for Q235 type steel when it comes to bicycle frames?

A supplier has told me that that is the type of steel their frames are made from, and I wanted to see if it was known for it's strength, or the opposite.

Any tips appreciated

gman2k · 21-03-2010 07:02PM

Never heard of it, but Mr. Google seems to suggest it is a Chinese standard....
What is the bike, and who is the supplier?
TBH, if it's not either a good Columbus or Reynolds branded steel bike, then I wouldn't go near. It may be just as strong, just as light etc etc, but for long term value and re-saleability, then the above two brands are the only way to go.

Al Wright · 21-03-2010 10:51PM

I think that Q235 refers to the steel composition ( American ASTM standard). I think it is plain carbon steel, the sort that that standard run of the mill bikes sold here 15 years ago were made from, so in this climate it will rust. A much better choice would be cro-moly steel referred to as 41--
Plain carbon steel tubing seemed to drop out off fashion in the past few years in mass produced bikes being largely replaced by Aluminium alloys.

gman2k · 21-03-2010 10:56PM

All steel framed bikes will rust here - even cro-moly composition.
You'd have to be looking at 953 stainless to get ultimate anti corrosion protection.
Mind you, what with the amount of salt they are starting to use on the roads here.....

Q235 steel for bicycle frames?

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