API SPEC 2MT2-2002 (R2015)

1 Scope

1.1 This speci?cation covers rolled shapes (wide ?ange shapes, angles, etc.), having a speci?ed minimum yield strength of 50 ksi (345 Mpa), intended for use in offshore structures. Commonly available Class A, Class B, and Class C beams refer to degrees of fracture criticality as described in section 8.1.3 of API RP 2A, with Class C being for the least critical applications. For special critical applications, Class AAZ shapes may be speci?ed, by agreement, using supple- ment S101.

1.2 Supplementary requirements are provided for use where additional testing or additional restrictions are required by the purchaser. Such requirements apply only when speci- ?ed in the purchase order.

1.3 When the steel is to be welded, a welding procedure suitable for the grade of steel and intended use or service is to be utilized. For the purposes of welding procedure quali?ca- tion under AWS D1.1, until AWS cites this speci?cation, use the following:

• a. Matching ?ller metals (AWS D1.1, Table 3.1) shall be as for Group II.
• b. Preheats (AWS D1.1, Table 3.2) shall be as for Category B (or Category D for class A-QST herein).
• c. Matching weld toughness (AWS D1.1, Tables C4.2 and C4.3) shall correspond to Class A, B, or C herein.
• Alternative preheats (AWS D1.1, Annex XI) may also be used to advantage.

1.4 When heat straightening, hot or warm forming, or post- weld heat treatment above 1050°F (565°C) is anticipated for Class A shapes produced by methods other than hot rolling, controlled rolling, normalized rolling, or normalizing, supple- ment S9 should be invoked.

1.5 By agreement, this speci?cation may be used as a sup- plement to purchase rolled shapes to other international stan- dards, e.g., Euronorm, ISO, or JIS, in which case references to ASTM A6 may be replaced by the comparable interna- tional standard. Users should note that dimensions and design properties might not be the same as A6 shape designations, and that “equivalent” sections could be heavier.