I have the strength numbers, too. Q195 and Q235 are 195 and 235MPa yields. 20 (>245MPa yield)is supposed to be comparable to 1020 (350MPa yield), and is used in seamless tubing. Q235 will work harden rather than bend, and is ng for shaping tubes. For the chinese steels I have information on, their yield numbers are low compared to simpler US carbon steels. Are the numbers accurate? Are there qualities of strength that are not in the numbers? (I am no metalurgist) Anyone able to shed a bit of light here? thanks, all.
Luiz, We are thinking about Chinese valves for a very sizeable program - - can you say what your troubles were - - you might save us real headaches .
Regards C M
We've had some trouble with Chinese nodular iron castings at my company. Specifically, issues with difficult machining (short tool life) of those castings. In addition, first article samples were produced in one Chinese foundry then full scale production was shifted to a different factory without our knowledge or approval. This particular incident was with parts sourced directly from Chinese companies.
Some resourcing to China has worked well and some has not. Be careful. Typically what has worked better is if we source from a middle man who deals with China directly and assumes some of the risk and also carries inventory here in this country (USA).
