In China, official corruption is not merely widespread, it's mandatory. No union, no OSHA, no SAE, no official standards, you can sue a manufacturer but the court has already decided in their favor.
Chinese steel foundries will "certify" steel with garbage (slag, dirt, sand) in it that nothing will remove and heat treatment won't fix.
The good news: not all of them are bad, they don't do it on purpose - it's just cheaper to make. Easy safety measure: if you order 10, and destroy 1 (X-ray, cut a journal in half for microscopy) and it's good, the other 9 are probably good.