3　Reheating Furnace

3.1　General

3.1.1　The chapter applies to design of furnaces in the large and medium sized mill and forge shop either built newly or in continuous production.

3.1.2　The type of furnace and the level of technology and equipment shall match with the production scale of workshop and the level of rolling process equipment.The selected structure，material and equipment of furnace shall meet the requirements of transportation，construction and installation，maintenance and replacement.

3.1.3　Configuration of number of furnaces and capacity of each furnace shall be based on improving furnace efficiency；standby furnace for maintenance in turn shall be spared.But capacity for further play of rolling mill capacity shall be reserved.

3.1.4　Designed nominal specific consumption of newly-built reheating furnace fired by gas or oil shall reach the"advanced index"in Table 3.1.4；designed nominal specific consumption of gas fired or oil fired reheating furnace modified or expanded，shall reach the"average advanced index"in Table 3.1.4.

Table 3.1.4　Designed nominal specific consumption of reheating furnace

Notes:1　The nominal specific consumption in this table is the specific fuel consumption under the conditions that，reference structural carbon steel billet/slab is cold charged and heated to the set discharging temperature，insulation layer of the water-cooled（evaporated cooling）units in furnace is good，and specific fuel consumption of reheating furnace reaches that under nominal production.
2　The nominal specific consumption in this table is applicable to walking beam type reheating furnace and pusher type reheating furnace which are listed in the Table 3.2.3 in this Code.

3.1.5　The cooling system of water pipes in furnace shall adopt evaporated cooling，and the generated steam should be connected to the power pipeline network of the factory for running together.

3.1.6　The highest temperature for design calculation of outer surface of the furnace bricking-up shall be in accordcance with the relevant provisions of current national standard"General principles for thermal insulation technique of industrial furnaces"GB/T 16618.

3.1.7　The waste heat in billet/slab of the last procedure shall be taken full advantage of during overall design procedure.

3.1.8　On the furnace layout drawing，related structures and equipment names，location dimensions and the location of various energy medium's T.O.P.in the furnace area shall be marked.