船體用鋼對化學(xué)成分、力學(xué)性能和加工性能等均有較高的要求,特別是高級別船板鋼對組織均勻性"強(qiáng)度和低溫沖擊韌性的要求非常高。
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.
中厚板鋼中非金屬夾雜物,如氧化物和硫化物可能對鋼的澆鑄性能和使用性能有不利影響:生產(chǎn)中Al2O3夾雜物可能會導(dǎo)致澆鑄過程中水口堵塞,影響連澆,還會在軋制后變?yōu)殚L條狀從而導(dǎo)致B類夾雜物超標(biāo)。
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.
北京科技大學(xué)的學(xué)者為了研究采用BOF-LF-RH-CC工藝生產(chǎn)的A32船板鋼潔凈度水平,進(jìn)行了三爐工業(yè)實(shí)驗X 通過對冶煉過程系統(tǒng)取樣分析。
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.
研究了鋼中總氧"氮含量變化,夾雜物的轉(zhuǎn)變規(guī)律及機(jī)理X 結(jié)果表明: 該工藝生產(chǎn)的船板鋼有較高的潔凈度,中包總氧控制在2×10-5以下,氮含量控制在4×10-5以下;LF精煉過程中,鋼中總氧"夾雜物數(shù)量密度和平均尺寸均降低,夾雜物轉(zhuǎn)變?yōu)镃aO-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精煉過程中,鋼中總氧和夾雜物數(shù)量密度降低,而夾雜物平均尺寸升高; 鈣處理過程中,夾雜物數(shù)量密度升高,而夾雜物平均尺寸降低,夾雜物轉(zhuǎn)變?yōu)镃aO - 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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