The valve rod (steel 35) is nitrided in the fluid soft nitriding process, the main material being made up of urea.
采用以尿素为主要原料的液体软氨化工艺，对阀杆(35钢)进行了氮化处理。
Since 1974 the research work on gas soft nitriding of nodular cast iron crankshafts used in agricultural diesel engine has started.
用气体软氮化强化农用柴油机球铁曲轴的研究始于1974年。
This paper has investigated the influence of alloying element Nb on structure and properties of the soft nitriding layer by means of experiments of the matrix steels containing Nb and Nbfree.
通过含铌与不含铌基体钢气体软氮化工艺对比实验，初步探索了合金元素铌对基体钢软氮化渗层组织与性能的影响。
The company's nitriding process is divided into:gas soft-nitriding, MGN and gas rigidity-nitriding.
公司的渗氮工艺分为：气体软氮化、MGN和气体硬氮化。
Therefore the current process must be improved for upgrading the first percent of pass for soft-nitriding heat treatment.
为此就须改进现有工艺，提高软氮化热处理的一次合格率。
Therefore the current process must be improved for upgrading the first percent of pass for soft-nitriding heat treatment.
为此就须改进现有工艺，提高软氮化热处理的一次合格率。
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