ASTM E381棒材坯段大方坯和锻件的宏观浸蚀标准评级图（套图3张）

ASTM E381 ADJUNCT I 
(PLATE I) ADJUNCT TO E381 METHOD OF MACROETCH TESTING STEEL BARS, BILLETS, BLOOMS, AND FORGINGS (ALSO SEE ASTM E 381 ADJUNCT II AND ASTM E 381 ADJUNCT III)

Plate I Graded series for three conditions: (1) sub-surface conditions; (2) random conditions, and; (3) center segregation

ASTM E381 ADJUNCT II 
(PLATE II) ADJUNCT TO E381 METHOD OF MACROETCH TESTING STEEL BARS,BILLETS, BLOOMS, AND FORGINGS (ALSO SEE ASTM E 381 ADJUNCT I AND ASTM E 381 ADJUNCT III)

  Plate II- Ungraded series showing various other conditions.

ASTM E381 ADJUNCT III 
(PLATE III) ADJUNCT TO E381 METHOD OF MACROETCH TESTING STEEL BARS, BILLETS, BLOOMS, AND FORGINGS (ALSO SEE ASTM E 381 ADJUNCT II AND ASTM E 381 ADJUNCT I)

Plate III Consists of photographs of macroetched specimens showing the typical location and general appearance of conditions found in continuously cast product. Some of the conditions are represented by sketches drawn on the photomacrographs. Plate III is used to identify the type of condition observed on the macroetch specimens.

适用范围
1.1 宏观浸蚀是为在低放大倍率下检验试样宏观组织所进行的试样浸蚀，它是用于评定诸如棒材、大小钢坯、初轧坯及锻件等钢产品的常用方法。
1.2 本标准是用一系列评级图片来评定钢试样的方法。这些图片显示了某些条件的影响。本标准只适用于碳钢和低合金钢棒材、钢坯、初轧坯及锻件的宏观浸蚀试验。
1.3 根据所做检验的类型，可选用不同的浸蚀剂。由于钢的化学成分、制造方法、热处理和许多其它因素的不同，各种钢对浸蚀剂所起的反应也各不相同。因此，浸蚀后所显示的各种迹象都必须认为与存在的各种因素有关。因而，若要制定一个通用的验收或拒收标准是不现实的。