板坯高温加热制造Hi-B取向硅钢

Producing Hi-B Grain-Oriented Silicon Steel Sheets for the Slab Heating at High Temp

热轧前，板坯进行两阶段加热，即，煤气加热炉加热阶段和电磁感应加热炉加热阶段，前者温度范围为1000～1170℃，这时的保护气氛为O2≤2％；后者温度范围为1380～1470℃，这时的O2浓度为≤3000ppm，保温时间为5～25min。高温高效加热需满足条件：20≤X·[ω／（T＋273）]^1/2≤60（1＋Q／P）。

In front of hot rolling the slab is heat two stages,namely,gas reheating furnace heating stages and electromagnetic induction reheating furnace heating stages, the former temp. in the region of 1000- 1170℃ under the condition of ≤2%O2 concentration in an atmosphere,the latter the slab is heated up to 1380- 1470 deg. C slab-center temp. in an atmosphere of ≤3000ppm O2 concentration and held at a temp. in the above region for 5-25min to undergo soaking treatment, high tern. and high efficiency heating condition need satisfies the relationship in an inequality ： 20≤ Xo[ω/（T＋ 273） ] 1/2≤60 （ 1 ＋ Q/P）.