ANSI MSS SP-44-2019 pdf free download – STEEL PIPELINE FLANGES.
The CE shall not exceed 0.48%, based on ladle analysis,without prior approval of the purchaser.If theCE exceeds 0.45%, the flange shall be marked with the actual CE result.
3.1.3.1 The choice and use of alloying elements,within the limits prescribed in Table 1, to give therequired tensile properties prescribed in Section 3.1.4, shall be made by the flange manufacturer andincluded and reported in the ladle and product analysis to identify the type of steel.
3.1.4 The steel used shall be capable of meeting the requirements of Section 4 and the flangemanufacturer’s design conditions, as specified in Annex A for welding neck flanges and Annex B forblind flanges. The tensile properties of the finished product shall meet the requirements prescribed inTable 2. All test methods shall be as specified in ASTM A370.
3.1.4.1 Lot (Definition)A “lot” is a particular quantity or batch of identified materialproduct from asingle manufacturer.For the purposes of this Standard Practice, a lot is further limited to material fromthe same raw material heat lot that is forged/rolled and heat treated together in the same furnace load.3.1.4.2 Lot Sampling Samples shall be taken per raw material lot, per heat treatment run if furnaces areannually surveyed(minimal) in accordance with A991/A991M(or equivalent), with =15 C (=25 °F)temperature uniformity, and control and recording sensors calibrated quarterly.
3.1.4.3 Test Specimens The test specimens may be taken tangential from the forgings at the locationsshown in Figure 4 or, at the manufacturers’option,from the billets or forging bar entering into thefinished product，provided such a test blank has undergone relatively the same forming and theequivalent heat treatment as the finished flange.
The dimensions of the test blank must be such as to adequately reflect the heat treatment properties ofthe hub of the flange. When a test blank is used, the test specimens shall be taken from mid-wall of thetest blank and the orientation shall be transverse to the direction of major working.
3.1.5Impact testing is not required on Grade F42 and lower. For Grades over F42, the Notch Toughnessproperties shall be determined with full size Charpy Type A, V-notch specimens, in accordance withASTM A370.Sub-size specimens shall be used only when material to be tested is of insufficientthickness. Charpy specimens shall be taken at the same frequency, from the same location and orientationas the tensile, with the notch perpendicular to the surface.For plate, (blind flanges only), specimens shallbe taken transverse to the direction of rolling. From each lot, one set (three specimens) shall be tested ata maximum temperature of -45 C (-50 °F) and show 27 J(20 fi-lb) minimum averagc,20 J (15 f-lb)individual minimum. Percent shear shall be reported for informational purposes only.
The test specimens shall have undergone relatively the same forming and the equivalent heat treatmentas the finished flange.
3.1.6Hardness Two hardness tests shall be made for each heat treatment lot by the Brinell method asspecified in ASTM A370. When more than one forging is produced from each heat, a minimum of twoforgings shall be tested with one reading from each forging. When only one forging is produced, it shallbe tested in two locations. Hardness shall be HBW 235 as a maximum.
3.1.7 Repair by Welding Repair by welding is only permitted by agreement with purchaser. Weldrepair procedure and welder qualifications shall be per ASME BPVC, Section IX.
3.2 Bolting The bolting listed in Table 3 shall be used in flanged joints covered by this StandardPractice. Bolting produced from other materials may be used if permitted by the applicable code orgovernmental regulation. All bolting materials are subject to the following limitations.
3.2.1 High Strength Bolting Bolting materials having allowable stresses not less than those for ASTMA193/A193M,Grade B7 are listed as high strength in Table 3. These and other materials of comparablestrength may be used in any flanged joint.ANSI MSS SP-44 pdf download.