【作者】 王勇；

【导师】 张红梅；

【作者基本信息】 辽宁科技大学 ， 材料加工工程， 2007， 硕士

【摘要】 我国的钢铁工业从20世纪90年代以来得到了快速发展，在全球已占有重要的位置，2006年首超4亿吨，稳居世界首位。而与高速发展的钢铁产业相比，我国的能源产业就较为落后。大力发展核电已成为我国能源开发的主导方向，未来15年间，我国将新建30座百万千瓦级的核电机组，即今后每年将会有两到三台核电机组开工建设。为核电用钢的国产化生产带来了极好的机遇。 本研究就针对核电建设二、三级设备用A42、A52钢的国产化开发进行了深入的研究，从结果来看，A42、A52钢采用适当的轧制及热处理，综合性能完全能够满足标准的要求，实行国产化生产是可行的。 冲击韧性是影响A42、A52钢的主要因素，而影响韧性偏低的原因较多，但从检验结果来看，钢中魏氏组织的存在不是主要原因，而钢中夹杂含量较高、带状组织的存在是造成钢板韧性偏低的主要原因。 A42、A52钢经过消应力处理后，钢板在不同温度下的强度及冲击韧性均满足标准的要求，表明上述两个钢种在长时间消应力处理下，性能仍较为稳定，能够适应下一步的生产需要。 采用J507焊条，在适当的焊接工艺条件下，A42钢板焊接接头处的综合性能控制较好，完全可以满足标准及用户焊接使用的要求。 优化钢中的C含量、提高钢质纯净度及钢中Ni含量是确保钢板具有一定强度的同时，进一步提高韧性的有效手段，其中最佳的C含量为0.10-0.14％，生产C级钢时，适宜的Ni含量为0.30％-0.40％。更多还原

【Abstract】 The steel industry in our country was developed quickly in 1990’s, and occupied an important position in the world. The annual output of steel exceeded 400 million in 2006, rank the first place in the world. But compared with the quickly development of steel industry, the energy industry in our country has fall behind. So nuclear power is becoming the main direction of national energy development. In the coming 15 years, there will be 30 nuclear power stations in our country, therefore, nearly 2 or 3 nuclear power stations would be built every year from now on. It is a good chance to make the produce technology of nuclear power steel nationalize.The nationalize produce of nuclear power steel was studied in this paper. Based on the investigation results, through proper rolling and heat treatment technology, the properties of A42, A52 steel can meet the normalization requirement, so it is feasible to make the produce nationalize.Impact ductility is the major influencing factor of A42 and A52 steel. There are many reasons that lead to impact ductility reduced. Based on the results of properties checking, the Widmanstatten structure is not the major factor, but the high content of impurities and banded structure in steel can affect the impact ductility dramatically.Through the disposal of stress relieving, the strength and impact ductility of A42 and A52 steel that under different temperature can meet the requirements, it is indicate that under long time stress relieving, the properties of the two steel still stable, could meet the requirement of the next produce.Under proper welding technological conditions, and using J507 welding rod, the properties of A42 plates’ soldered joint could be controlled better. The properties could meet the normalization requirements and the welding operating requirements.The carbon content was optimized, purify the steel and proper Nickel content is a available method to get high strength and impact ductility. The optimal carbon content of C grade steel is 0.10-0.14%, and the Nickel content is 0.30-0.40%.更多还原