API SPEC 2Y:2006 pdf download

API SPEC 2Y:2006 pdf download.Specification for Steel Plates,Quenched-and-Tempered, for Offshore Structures.
Si Ultrasonic Examination
Si .1 Pulse Echo ultrasonic examination shall be performed on each plate in accordance with ASTM Specification A 578/A 578M Straighi.Beain Ultrasonic Erwnmat,on of Plain and Clad Steel Plates for Special Applications. Acceptance Standard—Level A shall be used. Any area where one or more discontinuities produce a continuous total loss of hackwall reflection accompanied by continuous indications on the same plane that cannot be encompassed within a circle whose diameter is 3 in. (75mm) shall be cause for rejection.
S1.2 Examination reports shall be furnished for each plate. the areas with more than 500% loss of hack reflection shall be located on the sketch.
S.1.3 Optionally, and with prior consultation and agreement. Level C inspection may be used.
S2 Notch Toughness Test at Lower Temperature
S2.1 Notch toughness tests shall be made in accordance with the requirements of Section 7 or Supplementary
Requirement S12 and shall meet the requirements of Table S2-I in lieu of the requirements of Table 4 or Supplementary
Requirement S 12.2.
S2.2 Impact tests may be made at temperatures lower than those specified in Table 4 or Supplementary Requirement SI 2.2 and other than those specified in Table S2- 1. The testing temperature shall be specitied by the purchaser and agrccd to by the material manufacturer.
S2.3 If the design conditton requires a higher energy value, energy values higher than those stated in Table S2- I may be specified subject to agreement between the purchaser and the material manufacturer.
S3 Additional Tension Test
Two tension tests shall be taken from each plate as quenched and tempered. The test specimens shall be taken from a corner of the plate at both ends.
S4 Through-Thickness (Z-Direction) Testing
S4.1 This Supplementary Requirement covers the procedure and acceptance standards for the determination of reduction-of.area using a tension test specimen whose axis is normal to the surfaces of steel plates with nominal thickness /4 in. (19 mm and greater. l)etiniiions shall be in accordance with ASTM A 370.
S4.2 Na iber of Test Specinw.is. 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 he perpendicular to the surface of the plate.
S4.4 Location of Text Specinwns. 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. The joining method used should he one which results in a minimal heat.affccted.tone in the portion of the plate being tcsted Friction
S4.6 Testing. Tensile testing shall be conducted in accordance with the requireincins of ASTM A 370.
S4.7 Acceptance Siandarth. Standards for the acceptance of through-thickness testing shall be as follows:
a. bach tension test specimen shall exhibit a minimum reduction-of-area of 30%. If one of the two specimens from a plate is below 30%. hut 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 Supplementary Requirement S4.7.a may be specified subject to agreement between the material manufacwrer and the purchaser.
S.4.8 Marking. Plates accepted in accordance with this procedure for through-thickness testing shall be identified by stamping or stenciling ‘2” adjacent to marking otherwise required (i.e., API 2Y-50Z).
S5 Low Sulfur Steel For Improved Through-Thickness Properties
S5.1 Inieni. The intent of this supplementary requirement is to provide, by chemical control, plates with low levels of sulfide inclusions and thereby a reduction of the potential for lamellar tearing of the plate in the area of anachment welds.
S5.2 Che,nLvin’. The steels shall conform to the requirements for chemical composition prescribed in Table I, except that the maximum content of sulfur on heat analysis shall be 0.00(i%.
S5.3 Thrnugh-Thkkns Testing. Through-thickness (Z-direction) tensile testing is not required by this Supplementary Requirement.
S5.4 Marking. Plates accepted in accordance with this supplementary requirement shall he identified by stamping “IS’ adjacent to marking otherwise required (i.e.. API 2Y-5OLS).
S7 Low Nitrogen Content for Improved Notch Toughness in Strain-Aged Condition S7.1 The nitrogen content shall he 0(309% maximum on heat analysis.