DIN 45921-205-1987 电子元件质量评定协调体系.空白详细规范系统.高负荷固定电阻.评定级"M"(CECC40202)

上一篇: DIN 45921-204-1987 电子元件质量评定协调体系.空白详细规范.高负荷固定电阻.评定级"H"(CECC40203)
下一篇: DIN 45921-301-1987 电子元件质量评定协调体系.空白详细规范.精密固定电阻器

标准名称：	船用卧式自吸离心旋涡泵
英文名称：	Marine horizontal self-priming centrifugal-vortex pumps
中标分类：	船舶 >> 船用主辅机 >> 舱室辅机
ICS分类：	造船和海上建筑物 >> 船舶和海上建筑物综合 >> 船用发动机和推进系统
发布日期：	1900-01-01
实施日期：	2003-02-01
首发日期：	1900-01-01
作废日期：	1900-01-01
出版日期：	1900-01-01
页数：	12页

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Product Code:SAE J418
Title:Grain Size Determination of Steels (Cancelled May 1999)
Issuing Committee:Metals Test Procedures Committee
Scope:This classification for grain size comprises three sets of comparison charts to be used for determining grain size. These charts are presented in three categories as follows:Plate I - Untwinned grains (flat etch)Plate II - Twinned grains (flat etch)Plate IV - Austenite grains in steel (McQuaid-Ehn test or other test)Table 1 lists a number of materials and the comparison charts that are suggested for use in estimating their grain size by the comparison method.NOTE聴The suggestions in Table 1 are based upon the customary practices in industry. For specimens prepared according to special techniques, the appropriate comparison chart should be selected on a structural appearance basis as described in the Scope.