1.1 本试验方法涵盖厚度在3.18至19.1 mm之间的铁素体钢的落锤撕裂试验（DWTT）。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 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。 ====意义和用途====== 4.1 本试验方法可用于确定在断裂模式从脆性（解理或扁平）变为韧性（剪切或倾斜）的温度范围内，普通碳钢或低合金钢（屈服强度小于825 MPa）中扩展断裂的外观。 4.2 本试验方法可用于以下目的: 4.2.1 为了研究和开发，研究冶金变量（如成分或热处理）或制造操作（如焊接或成形）对断裂扩展模式的影响。 4.2.2 用于评估服务材料，通过指示服务温度下的断裂扩展行为来指示材料对特定应用的适用性。 4.2.3 出于信息或规范目的，仅当与服务行为建立了适当的相关性时，才提供制造质量控制。

1.1 This test method covers drop-weight tear tests (DWTT) on ferritic steels with thicknesses between 3.18 and 19.1 mm. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. ====== Significance And Use ====== 4.1 This test method can be used to determine the appearance of propagating fractures in plain carbon or low-alloy pipe steels (yield strengths less than 825 MPa) over the temperature range where the fracture mode changes from brittle (cleavage or flat) to ductile (shear or oblique). 4.2 This test method can serve the following purposes: 4.2.1 For research and development, to study the effect of metallurgical variables such as composition or heat treatment, or of fabricating operations such as welding or forming on the mode of fracture propagation. 4.2.2 For evaluation of materials for service to indicate the suitability of a material for specific applications by indicating fracture propagation behavior at the service temperature(s). 4.2.3 For information or specification purposes, to provide a manufacturing quality control only when suitable correlations have been established with service behavior.