高强度低合金铌钒结构钢标准规范
This specification covers the standard requirements for Grades 42[290], 50[345], 55[380], 60[415], and 65[450] of high-strength low-alloy columbium-vanadium structural steel shapes, plates, sheet piling, and bars for applications in bolted, welded, and riveted structures in bridges and buildings. The alloy shall conform to the required contents of columbium, vanadium, titanium, and nitrogen. Permissible values for the product thickness and size is given. Tensile requirements (including yield point, tensile strength, and minimum elongation) and alloy content are also specified. General delivery and test report requirements are also cited.
本规范涵盖了用于桥梁和建筑中螺栓连接、焊接和铆接结构的高强度低合金铌钒结构钢型材、板材、板桩和棒材的42[290]、50[345]、55[380]、60[415]和65[450]等级的标准要求。合金应符合铌、钒、钛和氮的 required 含量要求。给出了产品厚度和尺寸的允许值。还规定了拉伸要求（包括屈服点、抗拉强度和最小伸长率）和合金含量。还引用了通用交付和测试报告要求。
1.1 This specification covers five grades of high-strength low-alloy structural steel shapes, plates, sheet piling, and bars. Grades 42[290], 50[345], and 55[380] are intended for riveted, bolted, or welded structures. Grades 60[415] and 65[450] are intended for riveted or bolted construction of bridges, or for riveted, bolted, or welded construction in other applications.
1.2 For applications, such as welded bridge construction, where notch toughness is important, notch toughness requirements are to be negotiated between the purchaser and the producer.
1.3 Specification A588/A588M shall not be substituted for Specification A572/A572M without agreement between the purchaser and the supplier.
1.4 The use of columbium(niobium), vanadium, titanium, nitrogen, or combinations thereof, within the limitations noted in Section 5, is required; the selection of type(1,2,3, or 5) is at the option of the producer, unless otherwise specified by the purchaser.(See Supplementary Requirement S90.)
1.5 The maximum thicknesses available in the grades and products covered by this specification are shown in Table 1.
1.1 本规范涵盖了五种等级的高强度低合金结构钢型材、板材、板桩和棒材。42[290]、50[345]和55[380]等级适用于铆接、螺栓连接或焊接结构。60[415]和65[450]等级适用于桥梁的铆接或螺栓连接结构，或其他应用中的铆接、螺栓连接或焊接结构。
1.2 对于需要缺口韧性的应用，如焊接桥梁建设，缺口韧性要求应由采购方和生产商协商确定。
1.3 未经采购方和供应商同意，不得用规范A588/A588M替代规范A572/A572M。
1.4 必须使用在第5节所述限制范围内的铌、钒、钛、氮或其组合；类型(1、2、3或5)的选择由生产商决定，除非采购方另有规定。(参见补充要求S90。)
1.5 本规范所涵盖等级和产品的最大厚度如表1所示。
1.6 When the steel is to be welded, a welding procedure suitable for the grade of steel and intended use or service is to be utilized. See Appendix X3 of Specification A6/A6M for information on weldability.
1.7 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system is to be used independently of the other, without combining values in any way.
1.8 The text of this specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements.
1.9 For structural products produced from coil and furnished without heat treatment or with stress relieving only, the additional requirements, including additional testing requirements and the reporting of additional tests, of Specification A6/A6M apply.
1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.
1.6 当钢材需要焊接时，应采用适合该钢种和预期用途或服务的焊接程序。有关可焊性的信息，请参见规范A6/A6M的附录X3。
1.7 以英寸-磅单位或SI单位表示的值应单独视为标准。在文本中，SI单位显示在括号中。每个系统中所述的值不是精确等价的；因此，每个系统应独立于另一个系统使用，不以任何方式组合值。
1.8 本规范文本包含提供解释性材料的注释或脚注，或两者兼有。此类注释和脚注（表和图中的注释和脚注除外）不包含任何强制性要求。
1.9 对于由卷材生产且未经热处理或仅经应力消除处理的结构产品，适用规范A6/A6M的附加要求，包括附加测试要求和附加测试报告。
1.10 本国际标准是根据世界贸易组织技术性贸易壁垒(TBT)委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。
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