Product Code:SAE J469
Title:Zinc Die Casting Alloys
Issuing Committee:Metals Technical Executive Steering Committee
Scope:Because of the drastic chilling involved in die casting and the fact that the solid solubilities of both aluminum and copper in zinc change with temperature, these alloys are subject to some aging changes, one of which is a dimensional change. Both of the alloys undergo a slight shrinkage after casting, which at room temperature is about two-thirds complete in five weeks. It is possible to accelerate this shrinkage by a stabilizing anneal, after which no further changes occur. The recommended stabilizing anneal is 3 to 6 h at 100 掳C (212 掳F), or 5 to 10 h at 85 掳C (185 掳F), or 10 to 20 h at 70 掳C (158 掳F). The time in each case is measured from the time at which the castings reach the annealing temperature. The parts may be air cooled after annealing. Such a treatment will cause a shrinkage (0.0004 in per in) of about two-thirds of the total, and the remaining shrinkage will occur at room temperature during the subsequent few weeks. Stabilizing results in a decrease in dimensions of about 0.0005 in per in from the original size of the casting. Stabilizing is, of course, unnecessary if the machine or fitting operations can be delayed until the castings have aged five weeks at room temperature.ns of about 0.0005 in per in from the original size of the casting. Stabilizing is, of course, unnecessary if the machine or fitting operations can be delayed until the castings have aged five weeks at room temperature.

标准名称：	手夹快换接头
英文名称：	Quick action coupling of pipe for manual clamp
中标分类：	机械 >> 通用零部件 >> 管路附件
ICS分类：	机械系统和通用件 >> 紧固件 >> 环、套管、管接头、承插
替代情况：	替代JB/T 7850-1995
发布部门：	中华人民共和国国家发展和改革委员会
发布日期：	2007-03-06
实施日期：	2007-09-01
首发日期：
作废日期：
提出单位：	中国机械工业联合会
归口单位：	机械工业冶金设备标委会
起草单位：	西安重型机械研究所
起草人：	毕鹏
出版社：	机械工业出版社
出版日期：	2007-09-01
页数：	8页
批文号：	20292-2007
书号：	15111·8371

本标准规定了手夹快换接头的型式与尺寸、技术要求、耐压试验、检验规则及标志、包装、运输和贮存。本标准适用于公称压力PN≤1.6MPa、介质温度≤1120℃。

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