The new technologies of heating steel slabbillet using natural gas as fuel and regenerative combustion way are mainly described, as well as obvious energy saving results are gained.
着重叙述了用天然气作燃料，采用蓄热式燃烧方式加热钢板坯的新技术，以及加热炉取得了显著节能效果。
2
In this stage semifinished products with smaller cross sections are produced, such as slab, bloom or billet, which are suitable for further rolling.
这个阶段的产品是横断面较小的半成品，如板坯、大钢坯、小方坯等。这些半成品适合于进一步轧制。
3
The process of heat transfer while slab and billet solidifies is very complicated, but it become easy to describe by equivalent heat transfer coefficient.