Technical improvement on clean steel in the No.3 steel plant at Wisco, China Z. Yu, W. Zheng, X. Wang, Y. Zou In recent years, a series of measures have been taken to improve the cleanliness of the steel produced in the steel plant No.3 of Wisco. The content of impurities like C, N, H, S and total O is accurately controlled. The amount and nature of non-metallic inclusions can be adjusted and their shape modified. Results obtained in the case of IF steel and linepipe grades are presented.