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分析了Super304H不锈钢成品管和穿孔后133 mm毛管的显微组织。在Super304H不锈钢成品管组织中能观测到蠕虫状物相和较粗大的Nb化物,经电镜和XRD分析,可以确认蠕虫状物相是高温铁素体相,含量在6%~8%;穿孔后133 mm毛管组织中,存在少量的δ铁素体,但由于量很少,在X射线衍射分析时检测不到。结果表明,成品管中存在较多的δ铁素体主要是在从133 mm毛管到成品管生产过程中形成的,因此要降低软化处理和固溶处理的温度,既可减少δ铁素体相的量,也可减少粗大的Nb化物,保证最终钢管产品质量和提高产品合格率。
The microstructure of Super304H stainless steel finished pipe and 133 mm capillary after piercing was analyzed. In the Super304H stainless steel tube can be observed in the organization of worm-like phase and coarser Nb compounds, electron microscopy and XRD analysis, we can confirm the worm phase is a high-temperature ferrite phase, the content of 6% to 8%; after perforating In the 133 mm capillary tissue, a small amount of δ-ferrite was present but was undetectable by X-ray diffraction analysis due to its small amount. The results show that the existence of more δ-ferrite in the finished pipe is mainly formed from the 133 mm capillary tube to the finished pipe. Therefore, to reduce the temperature of the softening and solution treatment, the δ-ferrite phase can be reduced Of the amount, but also reduce the coarse Nb compounds to ensure the quality of the final steel pipe products and improve product yield.