Table 1. Reduction Degree Range of Different Stages with Different Reduction Temperatures.

T/K	1173	1223	1273	1323
first stage	0.0000–0.0248	0.0000–0.0687	0.0000–0.1331	0.0000–0.3324
second stage	0.0248–0.0816	0.0687–0.1935	0.1331–0.5566	0.3324–0.9936