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采用热重分析仪和扫描电镜研究了不同加热温度和升温速率下Ni/Cu比为0.39的低Ni/Cu比含铜钢铜富集行为。研究结果表明:在1050～1300℃加热温度范围内,富集相以富Cu-Ni相和富Ni相为主,且以颗粒形式弥散分布于氧化皮内部或氧化皮与钢基体界面;除1250℃外,随加热温度升高,富集相中Ni/Cu比值逐渐增加,在1200℃和1300℃时,富集相仅为富Ni相。加热温度为1250℃时,升温速率不同,富集相的Ni/Cu比值和氧化皮与钢基体界面形态不同:采用5℃/min低速升温和15℃/min高速升温均有利于增加Ni/Cu比值,而采用10℃/min中速升温导致Ni/Cu比值偏低;增加升温速率,缩短加热时间,使氧化皮与钢基体界面更加平滑,有利于除鳞以改善钢材表面质量。对生产高表面质量低Ni/Cu比含铜钢而言,可采取低温加热或高温加热,将加热温度分别控制在1180～1220℃或者1280～1320℃;也可采用1220～1280℃中温加热,将弱氧化性气氛下分阶段步进梁加热炉的第三阶段升温速率控制在15℃/min左右。
Thermogravimetric analysis and scanning electron microscopy were used to study the enrichment behavior of Cu / Cu steel with low Ni / Cu ratio of Ni / Cu ratio 0.39 under different heating temperature and heating rate. The results show that the enrichment phase mainly consists of Cu-Ni-rich phase and Ni-rich phase in the heating temperature range of 1050 ~ 1300 ℃, and is dispersed in the form of particles in the interior of scale or at the interface between scale and steel matrix. ℃, the Ni / Cu ratio in the enriched phase increases with the increase of heating temperature. At 1200 ℃ and 1300 ℃, the enrichment phase is only Ni-rich phase. When the heating temperature is 1250 ℃, the heating rate is different. The Ni / Cu ratio of enrichment phase and the interface between oxide scale and steel substrate are different. Adopting 5 ℃ / min low temperature and 15 ℃ / Ratio, while medium temperature heating at 10 ° C / min results in a low Ni / Cu ratio. Increasing the heating rate and shortening the heating time makes the interface between the scale and the steel substrate more smooth, which is in favor of descaling to improve the surface quality of the steel. For the production of high surface quality low Ni / Cu than copper-containing steel, low temperature heating or high temperature heating can be taken, the heating temperature is controlled at 1180 ~ 1220 ℃ or 1280 ~ 1320 ℃; can also be 1220 ~ 1280 ℃ temperature heating, The third stage heating rate of the step-by-step beam heating furnace under a weak oxidizing atmosphere is controlled at about 15 ° C / min.