API Spec 2H-2006 pdf download.Specification for Carbon Manganese Steel Plate for Offshore Structures.
3 General Requirements for Delivery 3.1 Material furnished to this specification shall conform to ASTM A6/A6M and shall be marked as specified in Section 8. In the event of conflict, this specification shall prevail. 3.2 Visual examination for defects shall be performed on all surfaces. 4 Manufacturing 4.1 All plates shall be normalized, except as otherwise permitted in 4.2, by the material manufacturer. Alternately, the fabricator may normalize the material using procedures established by the manufacturer on test coupons in accordance with ASTM A6/ A6M. 4.2 If approved by the purchaser, Grade 50 plates over 2 1 / 2 in. in nominal thickness, may be quenched-and-tempered by heating to a temperature between 1500°F (815°C) and 1700°F (925°C) to produce an austenitic structure, holding a sufficient time to attain uniform heat throughout the material, quenching in a suitable medium, and tempering in the range from 1100°F to 1300°F (595°C to 705°C). 5 Chemical Requirements 5.1 The steel shall conform to the requirements for chemical composition as prescribed in Table 1, and to the additional require- ments of the following subsections.
7 Notch Toughness Requirements 7.1 Impact tests shall be Charpy V-notch tests. The location of the impact specimens shall be adjacent to the thinnest and thick- est tension test piece representing each heat, except that in heats from which less than 50 tons (45 t) is furnished, one test will suf- fice. If more stringent requirements are desired, Supplements S2 and/or S12 may be specified. Charpy V-Notch Impact Test. Three transverse specimens shall be tested in accordance with ASTM A370. Specimen size, test temperature, and energy requirements are shown in Table 3. Due to the low carbon and sulfur contents, the energy of full-size specimens will often exceed the limit of ASTM E23. To prevent this, the producer has the option of testing sub-size specimens to any of the combinations of specimen size, energy requirement, and test temperature of Table 3, as indicated in options A through E. 7.2 If the average energy value for three specimens is below the average values specified, or if the energy value of one speci- men is less than the minimum energy value specified for a single specimen, retests may be made as follows: a. Retest three additional specimens, each of which must equal or exceed the minimum average energy value specified. b. If the required energy values are not obtained upon retest, the plate may be renormalized or quenched and tempered and retested. 7.3 After renormalizing or quenching and tempering, specimens shall be obtained and qualified as prescribed in 7.1.
8 Marking 8.1 Plate furnished to this specification shall be marked by the plate manufacturer in accordance with ASTM A6/A6M or ASTM A20/A20M if Supplementary Requirement S3 is ordered, with the addition of the following: a. The API Monogram may be applied to products complying with this specification, but only by authorized manufacturers (see Appendix C). b. Grade 42 shall be marked API 2H-42. Grade 50 shall be marked API 2H-50. c. Plate furnished in the as-rolled (green) condition to be heat treated by the fabricator shall be marked with suffix “G”; plates furnished normalized shall be marked with the suffix “N”; quenched-and-tempered plates shall be marked with the suffix “QT”; e.g., a normalized Grade 50 plate would be marked “API 2H-50N”. d. If any elements previously referenced in Section 5.4 are added to the plate, the plate shall be marked with a “C” adjacent to the “H” in the markings listed in Section 8.1.b (e.g., API 2HC-50).
S1 Ultrasonic Examination S1.1 Pulse Echo ultrasonic examination shall be performed on each plate in accordance with ASTM A578/A578M. Accep- tance Standard—Level A shall be used. Any area where one or more discontinuities produce a continuous total loss of backwall 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 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 require- ments of Table S2-1 in lieu of the requirements of Table 3 or S12.2. S2.2 Impact tests may be made at temperatures lower than those specified in Table 3 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 S2-1 may be speci- fied subject to agreement between the purchaser and the material manufacturer.