钢中氧含量超标会直接影响钢的机械性能,为确保LNG储罐的使用安全,准确测定其制造用材料06Ni9DR中的氧含量就显得尤为重要。通过多次试验对仪器各项参数进行选择优化,确定了最合适的试验条件,以确保数据的准确性。试验表明:脱气功率为5 ...钢中氧含量超标会直接影响钢的机械性能,为确保LNG储罐的使用安全,准确测定其制造用材料06Ni9DR中的氧含量就显得尤为重要。通过多次试验对仪器各项参数进行选择优化,确定了最合适的试验条件,以确保数据的准确性。试验表明:脱气功率为5 k W、脱气时间为45 s、分析功率为4 k W、分析时间为30 s时06Ni9DR钢板氧元素能排除干扰完全释放得到准确值,并与标准样品进行比对验证分析结果可靠。展开更多
Focusing on the banded microstructure formed during the production of 06Ni9 steels for cryo-LNG,this paper examines its formation,distribution of alloying elements,structure,hardness,and low-temperature property.The r...Focusing on the banded microstructure formed during the production of 06Ni9 steels for cryo-LNG,this paper examines its formation,distribution of alloying elements,structure,hardness,and low-temperature property.The results show that the banded microstructure formed after hot-rolling and cooling of the steel binct in which the element segregation occurred during solidification.The phase change during heat treatment also can cause the formation of the banded microstructure of 06Ni9 steel.The white bands are mainly composed of ferrite and reversed austenite,and the black bands are mainly composed of reversed austenite and a certain amount of ferrite.Element segregation and formation of more carbide caused some black regions to appear.Grain refinement of 06Ni9steel is beneficial to the formation of reversed austenite,the redistribution of alloying elements,improving the stability of austenite and the low-temperature toughness of steel.This steel easily undergoes nickel segregation;thus,undergoing a secondary quenching and tempering process is recommended.The refinement of martensite quenching above A c3,the martensite that is rich in nickel and carbon,residual austenite and a few little of ferrite after secondary quenching lower than A c3 are beneficial to the formation of high stability austenite.Thus,this can meet the strength and toughness requirement of the low temperature 06Ni9 steel.展开更多
文摘钢中氧含量超标会直接影响钢的机械性能,为确保LNG储罐的使用安全,准确测定其制造用材料06Ni9DR中的氧含量就显得尤为重要。通过多次试验对仪器各项参数进行选择优化,确定了最合适的试验条件,以确保数据的准确性。试验表明:脱气功率为5 k W、脱气时间为45 s、分析功率为4 k W、分析时间为30 s时06Ni9DR钢板氧元素能排除干扰完全释放得到准确值,并与标准样品进行比对验证分析结果可靠。
文摘Focusing on the banded microstructure formed during the production of 06Ni9 steels for cryo-LNG,this paper examines its formation,distribution of alloying elements,structure,hardness,and low-temperature property.The results show that the banded microstructure formed after hot-rolling and cooling of the steel binct in which the element segregation occurred during solidification.The phase change during heat treatment also can cause the formation of the banded microstructure of 06Ni9 steel.The white bands are mainly composed of ferrite and reversed austenite,and the black bands are mainly composed of reversed austenite and a certain amount of ferrite.Element segregation and formation of more carbide caused some black regions to appear.Grain refinement of 06Ni9steel is beneficial to the formation of reversed austenite,the redistribution of alloying elements,improving the stability of austenite and the low-temperature toughness of steel.This steel easily undergoes nickel segregation;thus,undergoing a secondary quenching and tempering process is recommended.The refinement of martensite quenching above A c3,the martensite that is rich in nickel and carbon,residual austenite and a few little of ferrite after secondary quenching lower than A c3 are beneficial to the formation of high stability austenite.Thus,this can meet the strength and toughness requirement of the low temperature 06Ni9 steel.
