A、520-950℃ B、610~1050℃ C、700~1200℃ D、400~1200℃
A、0.047-0.05% B、0.0047%-0.005% C、0.47-0.5% D、0.047%-0.05%
A、0.04-0.093% B、0.004%-0.0093% C、0.4-0.93% D、0.0004%-0.0093%