China will float 28.26 billion yuan ($4.2 billion) of ten-year book-entry treasury bonds from Thursday in a two-day sale, the Chinese Ministry of Finance said Wednesday.

The bonds will have an annual interest rate of 3.29 percent and become tradable Sept 21.

Interest on the bonds will be paid every half year.

The bonds are the 31st batch of the kind to be sold by the ministry this year.