ASME SA 213:2004 pdf download SPECIFICATION FOR SEAMLESS FERRITIC AND AUSTENITIC ALLOY-STEEL BOILER, SUPERHEATER, AND HEAT-EXCHANGER TUBES
9.Mechanical Properties9.1 Tensile Reqssirements:
9.1.1 The material shall conform to the requirements as totensile properties given in Table 4.
9.1.2 Table 5 gives the computed minimum elongationvalues for each !z-in. [0.8-mm] decrease in wall thickness.Where the wall thickness lies between two values shown inTable 5, the minimum elongation value shall be determined bythe following equations.For Grades T23,T24,T91,T92,T115,T122,T911,and S44400:E = 328+10.00 [E= 1.25t + 10.O0].
For Grade T36:E= 32t+ 5.0 [E= 1.25t + 5.0]. For all otherferritic alloy grades: E = 48t + 15.00 [ E= 1.87t + 15.00].
where:
E= elongation in 2 in.[50 mm],%，and=actual thickness of specimen, in. [mm].
9.1.3 One tension test shall be made on a specimen from onetube for lots of not more than 50 tubes.Tension tests shall bemade on specimens from two tubes for lots of more than 50tubes. See 15.2.
9.2 Hardness Requirements:
9.2.1 The material shall conform to the hardness require-ments given in Table 4.See 15.2.
9.2.2 Brinell，Vickersor Rockwell hardness tests shall bemade on specimens from two tubes from each lot. See 15.2.9.3 Flattening Test—One flattening test shall be made onspecimens from each end of one finished tube,not the one usedfor the flaring test,from each lot.See 15.1.
9.4 Flaring Test—One flaring test shall be made on speci-mens from each end of one finished tube, not the one used forthe flattening test,from each lot. See 15.1.
9.5 Mechanical property requirements do not apply totubing smaller than vin. [3.2 mm] in inside diameter orthinner than 0.015 in.[0.4 mm] in thickness.
10. Hydrostatic or Nondestructive Electric ‘Test
10.1 Each tube shall be subjected to the nondestructiveelectric test or the hydrostatic test.The type of test to be usedshall be at the option of the manufacturer, unless otherwisespecified in the purchase order.
11. Forming Operations
11.1 Tubes，when inserted in a boiler or tube sheet，shallstand expanding and beading without showing cracks or flaws.Superheater tubes when properly manipulated shall stand allforging, welding, and bending operations necessary for appli-cation without developing defects. See Note 1.
NonE l—Certain of the ferritic steels covered by this specification willharden if cooled rapidlly from above their critical temperature.Some willair harden, that is, become hardened to an undesirable degree when cooledin air from high temperatures,particularly chromium-containing steelswith chromium of 4 % and higher.Therefore，operations that involveheating such steels above their critical temperatures,such as welding,flanging,and hot bending,should be followed by suitable heat treatment.12. Repair by Welding
12.1 Repair welding shall be performed in conformancewith Specification A1016/A1016Mi.
12.2 All repair welds in T91 shall be made with one of thefollowing welding processes and consumables: SMAW,A5.5/A5.5M E90XX-B9;SAW,A5.23/A5.23M EB9 + neutral flux;GTAW,A5.28/A5.28M ER90S-B9; and FCAW A5.29/A5.29ME91T1-B9.In addition, the sum of the Ni+Mn content of allwelding consumables used to weld repair T91 Types 1 and 2shall not exceed 1.0 %.
12.3 All repair welds in T92,T911 , and T122,shall be madeusing welding consumables meeting the chemical requirementsfor the grade in Table l.
13.Permissible Variations from the Specified Wall
Thickness
13.1 Permissible variations from the specified minimumwall thickness shall be in accordance with SpecificationA1016/A1016M.
13.2 Permissible variations from the specified average wallthickness shall be ±10 %of the specified average wallthickness for cold formed tubes and, unless otherwise specifiedby the purchaser, shall be in accordance with Table 6 for hotformed tubes.
14.Surface Condition
14.1 Ferritic alloy cold-finished steel tubes shall be free ofscale and suitable for inspection.A slight amount of oxidationis not considered scale.
14.2 Ferritic alloy hot-finished steel tubes shall be free ofloose scale and suitable for inspection.
14.3 Stainless steel tubes shall be pickled free of scale.When bright annealing is used, pickling is not necessary.14.4 Any special finish requirement shall be subject toagreement between the supplier and the purchaser.
15. Sampling
15.1 For flattening,flaring, and grain size requirements, theterm lot applies to all tubes, prior to cutting, of the same size(see 4.1.7) that are produced from the same heat of steel. Whenfinal heat treatment is in a batch-type furnace,a lot shallinclude only those tubes of the same size and from the sameheat that are heat treated in the same furnace charge. When thefinal heat treatment is in a continuous furnace or when theheat-treated condition is obtained directly by quenching afterhot forming, the number of tubes of the same size and from thesame heat in a lot shall be determined from the size of the tubesas prescribed in Table 7.
15.2 For tensile and hardness test requirements, the term lotapplies to all tubes prior to cutting, of the same size (see 4.1.7)that are produced from the same heat of steel. When final heattreatment is in a batch-type furnace, a lot shall include onlythose tubes of the same size and the same heat that are heattreated in the same furnace charge. When the final heattreatment is in a continuous furnace, or when the heat-treatedcondition is obtained directly by quenching after hot forming,a lot shall include all tubes of the same size and heat,heattreated in the same furnace at the same temperature,time at
ASME SA 213:2004 pdf download
