1.1这些试验方法的目的是检测双相不锈钢轧制产品中是否存在金属间相，从而显著影响韧性或耐腐蚀性。这些试验方法不一定检测由其他原因引起的韧性或耐腐蚀性损失。 1.2双相（奥氏体-铁素体）不锈钢在约600至1750°F（320至955°C）的温度范围内暴露时容易形成金属间化合物。这些沉淀反应的速度是每个单件的成分和热机械历史的函数。这些相的存在对韧性和耐腐蚀性有害。 1.3双相不锈钢的正确热处理可以消除磨机产品中的这些有害相。 磨机产品的快速冷却可最大限度地防止后续热暴露形成有害相。 1.4遵守适用产品规范的化学和机械要求并不一定表明磨机产品中不存在有害相。 1.5这些试验方法包括: 1.5.1 试验方法A -双相不锈钢蚀刻结构分类的氢氧化钠蚀刻试验（第3-7节）。 1.5.2 试验方法B -双相不锈钢结构分类的夏比冲击试验（第8-13节）。 1.5.3 试验方法C -双相不锈钢结构分类的氯化铁腐蚀试验（第14-20节）。 1.6如果选择了适当位置和方向的样品，则在所有三个试验中都很容易检测到有害金属间相的存在。 由于金属间相的出现是温度和冷却速度的函数，因此必须将试验应用于最有可能促进金属间相形成的材料区域。在普通热处理的情况下，该区域将是冷却最慢的区域。除快速冷却的材料外，可能需要从被确定为冷却最慢的位置进行取样，以表征材料件。 1.7试验不确定有害相的精确性质，而是确定金属间相的存在或不存在对材料的韧性和耐腐蚀性有害的程度。 1.8中给出了热暴露、金属间相的出现以及韧性和耐腐蚀性退化的相关性示例。 1.9以英寸-磅或国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.10 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 The purpose of these test methods is to allow detection of the presence of intermetallic phases in mill products of duplex stainless steels to the extent that toughness or corrosion resistance is affected significantly. These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes. 1.2 Duplex (austenitic-ferritic) stainless steels are susceptible to the formation of intermetallic compounds during exposures in the temperature range from approximately 600 to 1750°F (320 to 955°C). The speed of these precipitation reactions is a function of composition and thermomechanical history of each individual piece. The presence of these phases is detrimental to toughness and corrosion resistance. 1.3 Correct heat treatment of duplex stainless steels can eliminate these detrimental phases in the mill product. Rapid cooling of the mill product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures. 1.4 Compliance with the chemical and mechanical requirements for the applicable product specification does not necessarily indicate the absence of detrimental phases in the mill product. 1.5 These test methods include the following: 1.5.1 Test Method A —Sodium Hydroxide Etch Test for Classification of Etch Structures of Duplex Stainless Steels (Sections 3-7). 1.5.2 Test Method B —Charpy Impact Test for Classification of Structures of Duplex Stainless Steels (Sections 8-13). 1.5.3 Test Method C —Ferric Chloride Corrosion Test for Classification of Structures of Duplex Stainless Steels (Sections 14-20). 1.6 The presence of detrimental intermetallic phases is readily detected in all three tests, provided that a sample of appropriate location and orientation is selected. Because the occurrence of intermetallic phases is a function of temperature and cooling rate, it is essential that the tests be applied to the region of the material experiencing the conditions most likely to promote the formation of an intermetallic phase. In the case of common heat treatment, this region will be that which cooled most slowly. Except for rapidly cooled material, it may be necessary to sample from a location determined to be the most slowly cooled for the material piece to be characterized. 1.7 The tests do not determine the precise nature of the detrimental phase but rather the presence or absence of an intermetallic phase to the extent that it is detrimental to the toughness and corrosion resistance of the material. 1.8 An example of the correlation of thermal exposures, the occurrence of intermetallic phases, and the degradation of toughness and corrosion resistance is given in. 1.9 The values stated in either inch-pound or SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.10 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.