船体用钢对化学成分、力学性能和加工性能等均有较高的要求，特别是高级别船板钢对组织均匀性"强度和低温冲击韧性的要求非常高。

Ship steel has higher chemical composition, mechanical properties and processing performance requirements, especially high grade steel on the microstructure of the strength and impact toughness at low temperature is very high.

中厚板钢中非金属夹杂物，如氧化物和硫化物可能对钢的浇铸性能和使用性能有不利影响：生产中Al2O3夹杂物可能会导致浇铸过程中水口堵塞，影响连浇，还会在轧制后变为长条状从而导致B类夹杂物超标。

Non metallic inclusions in steel plate, such as oxides and sulfides may have adverse effect on casting properties and performance of steel production: Al2O3 inclusions may lead to nozzle clogging in casting process of continuous casting, but also to strip leading to B type inclusion in exceed the standard after rolling.

北京科技大学的学者为了研究采用BOF-LF-RH-CC工艺生产的A32船板钢洁净度水平，进行了三炉工业实验X 通过对冶炼过程系统取样分析。

Researchers from the University of Science and Technology Beijing in order to study the BOF-LF-RH-CC technology used in production of A32 steel cleanliness level, carried out three experiments of X through the analysis of the industrial furnace smelting process system sampling.

研究了钢中总氧"氮含量变化，夹杂物的转变规律及机理X 结果表明: 该工艺生产的船板钢有较高的洁净度，中包总氧控制在2×10-5以下，氮含量控制在4×10-5以下；LF精炼过程中，钢中总氧"夹杂物数量密度和平均尺寸均降低，夹杂物转变为CaO-MgO- Al2O3三元系。

Study on the variation of nitrogen content of total oxygen in steel, change law and mechanism of X inclusion results showed that there were higher in the production process of steel cleanliness, in the total package oxygen control under 2 * 10-5, the nitrogen content in the following 4 * 10-5; LF refining process, the total oxygen in steel inclusion object number density and average size were decreased and the inclusion into CaO-MgO- Al2O3 three system.

RH精炼过程中，钢中总氧和夹杂物数量密度降低，而夹杂物平均尺寸升高; 钙处理过程中，夹杂物数量密度升高，而夹杂物平均尺寸降低，夹杂物转变为CaO - Al2O3-CaS三元系。

RH refining process, total oxygen and inclusions in steel number density decreased, and the average size of inclusions increased; calcium treatment process, inclusion number density increases, and the average size of inclusions decreased, inclusion into CaO - Al2O3-CaS three system.

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