Product Code:SAE J431
Title:Automotive Gray Iron Castings
Issuing Committee:Automotive Iron And Steel Castings Committee
Scope:This SAE Standard covers the hardness, tensile strength, and microstructure and special requirements of gray iron sand molded castings used in the automotive and allied industries. Specific requirements are provided for hardness of castings. Test bar tensile strength/Brinell hardness (t/h) ratio requirements are provided to establish a consistent tensile strength-hardness relationship for each grade to facilitate prediction and control of tensile strength in castings. Provision is made for specification of special additional requirements of gray iron automotive castings where needed for particular applications and service conditions.Note: This document was revised in 1993 to provide grade specific t/h control. In 1999 the document was revised to make SI metric units primary. To better align the grading system with long established production methods and grades produced, the previous system of grading by fixed combinations of tensile strength and hardness was changed in 1999 to a system of grading by variable combinations of test bar t/h ratio and casting hardness grades. The number of hardness grades was increased relative to the number of previously available ranges to facilitate centering of casting mean hardness in the specification range so that dependence of cost optimization on controlling near the low or high sides of specification ranges is minimized.

标准名称：	粉末冶金机油泵齿轮 技术条件
英文名称：	Specifications for powder metallurgy oil pump gears
中标分类：	冶金 >> 粉末冶金 >> 粉末冶金材料与制品
ICS分类：	冶金 >> 粉末冶金
替代情况：	替代JB/T 7907-1999
发布部门：	中华人民共和国工业和信息化部
发布日期：	2011-12-20
实施日期：	2012-04-01
首发日期：
作废日期：
归口单位：	机械工业粉末冶金制品标准化技术委员会
起草单位：	杭州粉末冶金研究所
出版社：	机械工业出版社
出版日期：	2012-04-01

本标准规定了工作油压不大于1.2MPa的内燃机油泵粉末冶金齿轮(外啮合渐开线圆柱直齿齿轮)的技术要求、试验方法、检验规则以及标志、包装、运输和贮存。
本标准适用于内燃机油泵粉末冶金齿轮。

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