The effect of furnace gas on surface quality o£ continuous cast slab and hot rolled plate of stainless steel 304 (/% : ≤0. 08C

18 ~20Cr

8 ~ 10.5Ni) has been studied by theory analysis

verification in laboratory test and commercial pilot-production. The commercial production results show that as the water vapour content in burnt furnace gas in heating furnace is 19. 5%

the surface scale of heated casting slab is thick

fine and close

the residual scale is obvious after descaling and the colour and lustre of hot rolled steel plate are not uniform with local roughness 4. 0 μm； as water vapour content in burnt furnace gas decreases to 5. 8%

the surface scale of heated cast slab is loose and thin

there is not scale being visible to naked eye after descaling and the colour and lustre of hot rolled steel plat are uniform with total roughness 3. 0 μm. Therefore in order to increase the surface quality of hot rolled plate

it should be to control the water vapour content in burnt furnace gas of heating furnace.