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根据冶金工业部科技司稀土开发应用项目合同计划,由河北机电学院承担的“稀土铁基粉末热锻(针阀体)材料及工艺研究”课题,于1987年9月23日通过省级鉴定。材料冷热加工工艺性能良好,针阀体和喷油嘴偶件质量检查项目均达到部颁标准(JB/NQ109.1—86)一等品要求;淬火一时效后,硬度为HRC55—62,材料中碳化物颗粒大小为0.12mm,残余奥氏体量为0.3％,具有高的耐磨性和良好的尺寸稳定性;使用寿命平均为1769.8小时,超过部颁标准(JB/NQ109.1—86为1500小时)。
According to the Ministry of Science and Technology of the Ministry of Metallurgical Industry rare earth development and application of project contract plan, undertaken by Hebei Mechanical and Electrical Institute of rare earth iron-based powder hot forging (needle valve body) materials and technology research "issue, on September 23, 1987 passed the provincial appraisal. Hot and cold materials processing technology performance is good, the needle valve and nozzle even quality inspection items have reached the ministerial standards (JB / NQ109.1-86) first-class requirements; quenching a time effect, the hardness of HRC55-62, The carbide particles in the material have a size of 0.12mm, an amount of retained austenite of 0.3%, high wear resistance and good dimensional stability; the average service life is 1769.8 hours, exceeding the standards of the Ministry of Education (JB / NQ109.1- 86 for 1500 hours).