序言这是CSA G30的第三版。18.混凝土钢筋用碳钢筋。它取代了2009年和1992年出版的前两个版本。CSA承认，本标准的制定部分是由于加拿大钢筋协会的财政支持。本标准的制定符合加拿大标准委员会对加拿大国家标准的要求。CSA集团已将其作为加拿大国家标准发布。范围1。1本标准规定了混凝土钢筋的变形和普通圆钢筋的要求，这些钢筋可按切割长度或成卷提供。 1.2本标准涵盖两种类型的钢筋:a）R型——用于一般应用。R标识仅用于指定、订购和通信，不会滚到变形钢筋上。b） W型-适用于需要限制化学成分和机械性能的应用。W型钢筋具有更好的延展性和焊接性。在变形钢筋表面轧制W标志。1.3本标准规定了三个最低屈服强度等级，即400 MPa（指定为400R和400W级）、500 MPa（指定为500W级）和600 MPa（指定为600W级）（见表4）。 1.4本标准包括W型钢筋的化学成分和碳当量限制，以提高材料的可焊性。一些棒材制造技术可能会使材料不太适合焊接应用。如果需要焊接，应使用适合化学成分、冶金结构、制造方法和预期用途或服务的程序。CSA W186描述了正确的设计和填充金属的正确选择、预热/焊道间温度以及要使用的性能和程序鉴定要求。1.5在本标准中，“应”用于表示要求，即:。 e、 ，用户必须满足的条款，以符合标准；“应该”用于表示建议或建议但不需要的建议；“可”用于表示一个选项或在标准范围内允许的选项。注释随附条款不包括要求或替代要求；随附条款的注释的目的是将解释性或信息性材料与文本分开。表和图的注释被视为表或图的一部分，可以作为要求编写。附件被指定为规范性（强制性）或信息性（非强制性）- 必须）定义其应用程序。1.6国际单位制给出的数值为本标准中的记录单位。括号中给出的值仅供参考和比较。

PrefaceThis is the third edition of CSA G30.18, Carbon steel bars for concrete reinforcement. It supersedes the previous editions, published in 2009 and 1992. CSA acknowledges that the development of this Standard was made possible, in part, by the financial support of the Reinforcing Steel Institute of Canada. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.Scope1.1 This Standard specifies requirements for deformed and plain round steel bars for concrete reinforcement that can be furnished in cut lengths or in coils.1.2 Two Types of bars are covered by this Standard:a) Type R - Intended for general applications. The R designation is used for specifying, ordering, and communication only, and is not rolled onto the deformed bar.b) Type W - Appropriate for applications where restrictions in chemical composition and mechanical properties are desirable. Type W bars provide enhanced ductility and enhanced weldability. The W designation is rolled onto the surface of deformed bars.1.3 This Standard specifies three minimum yield strength levels, i.e., 400 MPa (designated as Grades 400R and 400W), 500 MPa (designated as Grade 500W), and 600 MPa (designated as Grade 600W) (see Table 4).1.4 This Standard includes limits to chemical composition and carbon equivalent of the Type W bars to enhance the weldability of the material. Some bar manufacturing techniques can render the material less appropriate for welding applications. If welding is required, a procedure suitable for the chemical composition, metallurgical structure, method of manufacture, and intended use or service should be used. CSA W186 describes the proper designs and proper selection of filler metals, preheat/inter-pass temperatures and performance and procedure qualification requirements to be used.1.5 In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.1.6 The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.