Suplementos Api

S1 Ultrasonic Examination

S1.1 Pulse Echo ultrasonic examination shall be performed on each plate in accordance with ASTM A578/A578M-96, Standard Specification for Straight-Beam Ultrasonic Examination of Plain and Clad Steel Plates for Special Applications. Acceptance Standard—Level II shall be used. Any laminations (defined as complete loss of back reflection) with a dimension greater than 3in. (75 mm) shall be cause for rejection.

S1.2 Examination reports shall be furnished for each plate, the areas with more than 50% loss of back reflection shall be located on the sketch.

S2 Notch Toughness Test at Lower Temperature

S2.1 Notch toughness tests shall be made in accordance with the requirements of Section 7 or S12 and shall meet the requirements of Table S2-1 in lieu of therequirements of Table 6.1 or S12.2.

S2.2 Impact tests may be made at temperatures lower than those specified in Table 6.1 or S12.2 and other than those specified in Table S2-1. The testing temperature shall be specified by the purchaser and agreed to by the material manufacturer.

S2.3 If the design condition requires a higher energy value, energy values higher than those stated in Table S2-1may be specified subject to agreement between the purchaser and the material manufacturer.



S3 Individual Plate Testing

S3.1 When testing of each plate is desired, steel may be ordered to conform to Sections 11 and 12 of ASTM A20/ A20M.

S4 Through-Thickness (Z-Direction) Testing

S4.1 This Supplementary Requirement covers the procedure and acceptance standards for the determinationof reduction-of-area using a tension test specimen whose axis is normal to the surfaces of steel plates 3⁄4 in. (19 mm) and thicker. Definitions shall be in accordance with ASTM A370.

S4.2 Number of Test Specimens. Two tests shall be taken from each plate as rolled (parent plate).

S4.3 Orientation of Test Specimens. The longitudinal axis of the test specimens shall be perpendicular to thesurface of the plate.

S4.4 Location of Test Specimens. One test specimen shall be taken at the ingot axis or cast slab longitudinal centerline at its intersection with each edge or end of the plate.

S4.5 Preparation of Test Specimens. Specimens shall be prepared as follows:

a. Prolongations shall be joined to opposite surfaces of the plate being tested, with their axes coincident. Thejoining method used should be one which results in a minimal heataffected- zone in the portion of the coupon being tested. Friction (inertia), stud, electron beam, or shielded metal-arc welding methods have proven to be suitable. Prolongation materials shall be selected so that failure shall occur in the plate portion of the specimen.

b. Specimens shall be machined to the form and dimensions of the0.500 in. (12.5 mm) round specimen of Figure 5 of ASTM Methods and Definitions A370, except for the plate thickness less than 11⁄4 in. (32 mm) where the 0.350 in. (8.75 mm) test specimen may be used.

c. The full plate thickness shall be contained within the uniform section with no taper permitted. The length (“G” in Figure 5 of ASTM A370) of the cylindrical section of the test piece shall beadjusted as necessary to contain the plate thickness within a uniform diameter throughout the section.

S4.6 Testing. Tensile testing shall be conducted in accordance with the requirements of ASTM A370.

S4.7 Acceptance Standards. Standards for the acceptance of through-thickness testing shall be as follows:

a. Each tension test specimen shall exhibit a minimum reduction-of-area of 30%. Ifone of the two specimens from a plate is below 30%, but not below 25%, a retest of two additional specimens from a location adjacent to the failed specimen shall be made, and both of these additional determinations shall equal or exceed 30%.

b. Minimum reduction-of-area limits higher than stated in S4.7a may be specified subject to agreement between the material manufacturer and the purchaser....