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《拖拉机齿轮热处理技术要求(JB/NQ26-85)》和《拖拉机轴类零件热处理技术要求(JB/NQ27-85)》,已经机械部农机局批准于1985年6月开始试行。该两标准的内容包括材料与工艺的选择、主要技术要求和质量检验方法等三部分。各企业可据该两标准进行制订各自的内控标准。该两标准与原部标NJ39-75,NJ40-75等比较,主要变动如下:
“Tractor Gear Heat Treatment Technical Requirements (JB / NQ26-85)” and “Tractor Shaft Heat Treatment Technical Requirements (JB / NQ27-85)”, has been approved by the Machinery Department of Agricultural Machinery Bureau in June 1985 trial. The two standards include the choice of materials and processes, the main technical requirements and quality inspection methods in three parts. According to these two standards, enterprises can formulate their own internal control standards. The two standards and the original standard NJ39-75, NJ40-75, etc., the main changes are as follows: