API 2H:1999 pdf download.Specification for Carbon Manganese Steel Plate for Offshore Platform Tubular Joints
1 Scope
1.1 Coverage. This secification covers two grades of inter- mediate strength steel plates up to 4 in. thick for use in welded construction of offshore structures, in selected critical portions which must resist impact, plastic fatigue loading, and lamellar tearing. These steels are intended for fabrication primarily by cold forming and welding as per API Spec 2B. The welding procedure is of fundamental importance and it is presumed that procedures will be suitable for the steels and their intended service. Conversely, the steels should be amenable to fabrication and welding under shipyard and offshore condi- tions. API Specifications 2W and 2Y cover companion steels providing similar mechanical properties but with improved weldability. This improvement results from a reduction in the . maximum allowed chemical composition and is made possible by changes in the method of hecat treatmnent and/or processing.
1.2 The primary use of these steels is in tubular joints, siff- ened plate construction, and other intersections where por- tions of the plates will be subjected to tension in the thickness direction (Z direction). Supplementary Requirement S-4 pro- vides for through thickness (2 direction) testing of the plates by the matrial manufacturer and specified limits for accep- tance. Supplementary Requirement S-1 provides for ultra- sonic examination of the plates by the material manufacturer and specifies limits for acceptance.
1.3 For aplcations where through-thickness properties are important but z direction testing has not been specified, Sup- plementary Requirement S-5 provides a low sulfur chemistry intended to reduce the size and number of sulfide inclusions in the plate. Supplementary requirement S-5 is neither a sub- stitute for S-4 Through Thickness Testing nor a guarantee of a minimum level of through-thickness ducility. Experience indicates, however, that tests of low sulfur carbon manganese steels usually show at least 20% reduction-of- area. Accord- ingly, supplcmentary requirement S 5 is intended as an alter- native to supplementary requirement S 4 when testing is not desired. If tested, low sulfur steel is dcsired, then both supple- mentary requirements S-4 and S-5 should be ordered.
1.4 The notch toughness requirements specificd in Section 7 or S-12 are suitable for application below water or above water . in arecas of temperate climate (14°F minimum service tempera- ture). Cold-formed materials have less toughness due to strain- ing than that of the original flat plate, especially in those areas aged by the attachment welding of stubs or braces.
API 2H:1999 pdf download
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