高级别管线用焊丝EF3超低磷冶炼工艺实践

为实现高级别管线用超低P焊丝EF3的批量稳定生产,对脱P的热力学条件和动力学条件研究,明确脱P的条件。通过铁水脱P、100 t转炉脱P、钢包脱P配合扒渣、二次LF精炼防回P工艺,配合低P合金,实现了超低P焊丝EF3的稳定生产。控制铁水w[Si]≤0.15%,造高碱度(R=6)的炉渣,可同时脱P、脱S,实现铁水w[P]≤0.020%、铁水w[S]≤0.005%;转炉终点温度在1595~1610℃,终渣碱度4.0左右,终渣中w[FeO]在23.0%~26.0%,可实现转炉出钢w[P]≤0.008%;采用钢包脱P,可实现钢水w[P]≤0.004%;钢包脱磷后配合扒渣工艺,扒渣前后基本不回P,采用二次LF精炼防增P,配合低P合金,增P量极少;从而可实现中间包钢水w[P]≤0.005%。

压气机轮盘用30Cr2Ni4MoV超纯净钢冶炼工艺研究

详细分析了压气机轮盘用30Cr2Ni4MoV超纯净钢冶炼难点及工艺控制思路,通过严格的过程控制,实现了超低P、低Mn钢的冶炼。

Diffusive Thermal Conductivity of Superfluid Fermi Gas in p-Wave State at Low Temperatures

The diffusive thermal conductivity tensor of p-wave superfluid at low temperatures is calculated by using the Boltzmann equation approach. We use the Sykes and Brooker procedure and show that Kxx is equal to Kyy and these are related to T-1, also Kxx is proporated to T-3.