I used to work in tianyuan group, and I'm leaving now.
Normally, 2000+ was normal when I just graduated.
About 2500-3000 after half a year, and 3000-3600 after one year.
About two years, 4000-5000+
Tianyuan's salary is relatively high, but it is often not paid, and it may not be settled until the end of the year.
Other companies are not sure, it should be settled once a month, but the salary is lower than Tianyuan's.
China Construction and China Railway are not clear, they should be higher.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.