is the company invition alone enaugh to scure me a China business visa?

Hi, considering your circumstances, I suggest you to apply a F visa. Except the invitation letter, you still need the following documents:

1.Completed visa application form with one white background passport-size photo stuck to the visa form.
2.Flight booking and hotel reservation.
3.Photocopy and original of business registration certificate and tax clearance
4.Introductory letter from the employer
5.Photocopy and original passport valid for more than six (6) months with at least two blank pages
6.Proof of economic guarantee (such as personal bank account statement or pay slips from employer for at least four months), both original and photocopy