炉气中水蒸气对304不锈钢热轧板氧化层及表面质量的影响

通过理论分析、实验室验证、工业生产试验研究了炉气对304奥氏体不锈钢（/%:≤0.08C,18~20Cr,8.0~10.5Ni）连铸坯以及热轧板表面质量的影响。工业生产试验结果表明,加热炉中燃烧后炉气中水蒸气含量为19.5%时,加热后铸坯表面铁鳞厚且致密,除鳞后铁鳞残留明显,热轧后钢板色泽不均匀,局部粗糙度4.0μm;当炉气中水蒸气含量降至5.8%时,加热后铸坯表面铁鳞稀薄、疏松,除鳞后无肉眼可见铁鳞,热轧后色泽均匀,整体粗糙度3.0μm。因此为提高热轧板表面质量,应控制加热炉燃烧后炉气中的水蒸气含量。

Effect of Water Vapour in Furnace Gas on Oxide Layer and Surface Quality of Hot Rolled Plate of Stainless Steel 304

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.