1、A615/A615M-166.Chemical Compositioning point on a deformation after the last included space.6.1 The chemical analysis of each heat of steel shall beSpacing measurements shall not be made over a bar areadetermined in accordance with Test Methods,Practices,andcontaining bar marking symbols involving l
2、etters or numbers.Terminology A751.The manufacturer shall make the analysis8.2 The average height of deformations shall be determinedon test samples taken preferably during the pouring of the heat.from measurements made on not less than two typical defor-The percentages of carbon,manganese,phosphoru
3、s,and sulfurmations.Determinations shall be based on three measurementsshall be determined.The phosphorus content thus determinedper deformation,one at the center of the overall length and theshall not exceed 0.06%other two at the quarter points of the overall length.6.2 A product check,for phosphor
4、us,made by the purchaser8.3 Insufficient height,insufficient circumferentialshall not exceed that specified in 6.1 by more than 25%coverage,or excessive spacing of deformations shall notconstitute cause for rejection unless it has been clearly estab-7.Requirements for Deformationslished by determina
5、tions on each lot(Note 4)tested that typical7.1 Deformations shall be spaced along the bar at substan-deformation height,gap,or spacing do not conform to thetially uniform distances.The deformations on opposite sides ofminimum requirements prescribed in Section 7.No rejectionthe bar shall be similar
6、 in size,shape,and pattern.shall be made on the basis of measurements if fewer than ten7.2 The deformations shall be placed with respect to the axisadjacent deformations on each side of the bar are measured.of the bar so that the included angle is not less than 45.WhereNorE 4-As used within the inte
7、nt of 8.3,the term lotshall mean allthe line of deformations forms an included angle with the axisthe bars of one bar size and pattern of deformations contained in anof the bar from 45 to 70 inclusive,the deformations shallindividual shipping release or shipping order.alternately reverse in directio
8、n on each side,or those on oneside shall be reversed in direction from those on the opposite9.Tensile Requirementsside.Where the line of deformations is over 70,a reversal in9.1 The material,as represented by the test specimens,shalldirection shall not be required.conform to the requirements for ten
9、sile properties prescribed in7.3 The average spacing or distance between deformationsTable 2.on each side of the bar shall not exceed seven tenths of the9.2 The yield point or yield strength shall be determined bynominal diameter of the bar.one of the following methods:7.4 The overall length of defo
10、rmations shall be such that the9.2.1 The yield point shall be determined by the drop or haltgap(measured as a chord)between the ends of the deforma-of the gauge of the tensile testing machine,where the steeltions shall not exceed 12.5 of the nominal perimeter of thetested has a sharp-kneed or well-d
11、efined yield point.bar.Where the ends terminate in a rib,the width of the rib shall9.2.2 Where the steel tested does not have a well-definedbe considered as the gap between these ends.The summationyield point,the yield strength shall be determined by the offsetof the gaps shall not exceed 25%of the
12、nominal perimeter ofmethod(0.2 offset),as described in Test Methods andthe bar.The nominal perimeter of the bar shall be 3.1416 timesDefinitions A370.the nominal diameter.9.3 When material is furnished in coils,the test specimen7.5 The spacing,height,and gap of deformations shallshall be taken from
13、the coil and straightened prior to placing itconform to the requirements prescribed in Table 1.in the jaws of the tensile testing machine.(See Note 5.)8.Measurements of DeformationsNorE 5-Straighten the test specimen to avoid formation of local sharpbends and to minimize cold work.Insufficient strai
14、ghtening prior to8.1 The average spacing of deformations shall be deter-attaching the extensometer can result in lower-than-actual yield strengthmined by measuring the length of a minimum of ten spaces andreadings.dividing that length by the number of spaces included in the9.3.1 Test specimens taken
15、 from post-fabricated materialmeasurement.The measurement shall begin from a point on ashall not be used to determine conformance to this specifica-deformation at the beginning of the first space to a correspond-tion.(See Note 6.)TABLE 2 Tensile RequirementsGrade 40Grade 60Grade 75Grade 80Grade 1002
16、80144201520550690jTensile strength,min,psi MPa60000【42090000620100000690105000725115000790Yield strength,min,psi MPa40000280600004207500052080000550100000690Elongation in 8 in.200 mm,min.Bar Designation No.31011974,513,1629761912977,822.257179,10,1129,32,366614,18.2043.57,6466Grade 40 280bars are furnished only in sizes 3 through 6 10 through 19
