Product Code:SAE USCAR5-2
Title:Avoidance of Hydrogen Embrittlement of Steel
Issuing Committee:
Scope:This standard outlines the conditions that enhance the risk of hydrogen embrittlement of steel and define the relief procedures required to minimize the risk of hydrogen embrittlement. It is intended to control the process. 1.1 Hydrogen embrittlement of steel, which can cause brittle fractures under stress, occurs as a result of the absorption of hydrogen during cleaning, phosphate coating and plating processes. The susceptibility to hydrogen embrittlement increases with increasing stress (internal or externally applied stress) and increasing material strength. 1.2 Hardness readings in this specification are in Vickers scale. SAE J417 should be referred to for conversion to other scales. NOTE 1: All references to temperatures relate to part core temperature and not the indicated oven air temperature. Statistical data of verifications in temperature at the center of the oven load and oven temperature shall be established to develop the oven profile. The temperature of parts in a batch type of baking furnace shall be monitored with a thermocouple placed in the middle of the load. For continuous bake ovens a temperature trace through the oven must be run with a calibrated thermocouple in the lowest temperature position, at least once a year.

标准名称：	机械闹种
英文名称：	Mechanical alarm clock
中标分类：	轻工、文化与生活用品 >> 钟表、自行车、缝纫机 >> 钟表
替代情况：	原标准号GB 4034-1983
发布部门：	中华人民共和国轻工业部
发布日期：	1992-07-06
实施日期：	1993-03-01
首发日期：	1900-01-01
作废日期：	2010-01-20
提出单位：	轻工业部质量标准司
归口单位：	全国钟表标准化中心
起草单位：	上海钟厂、天津钟表厂
出版社：	中国轻工业出版社
出版日期：	1993-03-01
页数：	10页

本标准规定了机械闹钟的产品分类、技术要求、试验方法、检验规则及标志、包装、运抽、贮存。
本标准适用于能够在预定时间发出闹声的以发条为动力源，具有摆轮游丝振荡系统的机械闹钟。

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