高强度热轧钢筋

[中文适用范围]： 本 SAE 推荐做法涵盖两个级别的高强度结构低合金钢棒，其最小屈服点分别为 345 MPa (50 ksi) 和 450 MPa (65 ksi)。两个强度级别分别为 345 和 450 MPa 或 50 和 65 ksi 最小屈服点。使用不同的化学成分来实现指定的机械性能。在某些情况下，相同强度水平的化学成分存在显着差异，具体取决于制造要求。应该注意的是，尽管来自不同供应商的钢种的机械性能可能相同，但化学成分可能会有很大差异。制造商应意识到某些成分差异可能会影响材料的成型、焊接和/或使用要求。因此，建议制造商咨询生产商以了解化学成分的影响。本文件范围内的产品包括以下类型和尺寸的棒材：所有尺寸的圆形、方形和六角形（仅切割长度）、厚度为 5.2 毫米（0.203 英寸）及以上但不大于 150 毫米（ 6 英寸）宽，平面厚度大于 5.8 毫米（0.229 英寸），宽度超过 150 毫米（6 英寸）至 204 毫米（8 英寸）。本文件之前介绍了 290A、345A、415A、450A、345W、345F、415F、485F 和 550F 等级的板材、结构形状和棒材尺寸形状以及 290A、415A 和 345W 等级的棒材。这些产品不再涵盖；这些产品和等级的要求可在 ASTM 规范中找到。 [外文原描述]： This SAE Recommended Practice covers two levels of high strength structural low-alloy steel bars having minimum Yield Points of 345 MPa (50 ksi) and 450 MPa (65 ksi).The two strength levels are 345 and 450 MPa or 50 and 65 ksi minimum yield point. Different chemical compositions are used to achieve the specified mechanical properties. In some cases there are significant differences in chemical composition for the same strength level, depending on the fabricating requirements.It should be noted that although the mechanical properties for a steel grade sourced from different suppliers may be the same, the chemical composition may vary significantly. The fabricator should be aware that certain compositional differences may effect the forming, welding, and/or service requirements of the material. It is therefore recommended that the fabricator consult with the producer to understand the effect of chemical composition.The products within the scope of this document include bars of the following types and sizes:Rounds, squares, and hexagons of all sizes (cut length only), flats 5.2 mm (0.203 in) and greater in thickness but not greater than 150 mm (6 in) wide, and flats greater than 5.8 mm (0.229 in) thick and over 150 mm (6 in) to 204 mm (8 in) wide.This document previously covered plates, structural shapes, and bar size shapes of Grades 290A, 345A, 415A, 450A, 345W, 345F, 415F, 485F, and 550F as well as bars of Grades 290A, 415A, and 345W. These products are no longer covered; requirements for these products and grades can be found in ASTM Specifications as follows in Table 1 :ProductPrevious SAE GradeASTM Specification/GradePlates, Structural Shapes, Bar Size Shapes, Bars290AA 572/A 572M, Grade 42Plates, Structural Shapes, Bar Size Shapes345AA 572/A 572M, Grade 50Plates, Structural Shapes, Bar Size Shapes, Bars415AA 572/A 572M, Grade 60Plates, Structural Shapes, Bar Size Shapes450AA 57/A 572M, Grade 65Plates, Structural Shapes, Bar Size Shapes, Bars345WA 588/A 588MPlates345FA 656/A 656M, Grade 50Plates415FA 656/A 656M, Grade 60Plates485FA 656/A 656M, Grade 70Plates550FA 656/A 656M, Grade 80 TABLE 1EQUIVALENT ASTM SPECIFICATIONSCross Reference: ASTMA370,ASTMA572/A572M,ASTMA588/A588M,ASTMA6/A6M,ASTMA656/A656M