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General Requirements
Meterial furnished under this specification shall conform to the applicable requirements of the current edition of Specification A1016/1016M,unless otherwise provided herein.
Manufacture
1.The welded[WLD] tubes shall be made from flat-rolled steel by an automatic welding process with no addition of filler metal.
1.1 Subsequent to welding and prior to final heat treatment,the tubes shall be cold worked either in both weld and base metal or in weld metal only.The method of cold working may be specified by the purchaser.When cold drawn,the purchaser may specify the minimum amount of reduction in cross-sectional area or wall thickness,or both.
1.2 Heavily cold worked [HCW] tubes shall be made by applying cold working of not less than 35% reduction in both wall and weld to a welded tube prior to the final anneal.No filler metal shall be used in the making of the weld.Prior to cold working,the weld shall be 100% radiographically inspected in accordance with the requirements of ASME Boiler and Pressure Vessel Code,Section Ⅷ,Division 1, latest revisio,Paragraph UW 51.
Heat Treatment
1.All material shall be furnished in the heat-treated condition in accordance with the requirements of Table 2.
2.A solution annealing temperature above 1950°F [1065 ℃] may impair the resistance to intergranular corrosion after subsequent exposure to sensitizing conditions in TP309HCb,TP310HCb,TP321,TP347,TP347H,TP348,and TP348H.When specified by the pruchaser,a lower temperature stabilization or re-solution anneal shall be used subsequent to the initial high temperature solution anneal [see supplementary requirements S4].
3.N08020 shall be supplied in the stabilization treatment condition.
Grain Size Requirement
1.The grain size of Grades TP309H,TP309HCB,TP310H,and TP310HCB,as determined in accordance with Test Methods E112.shall be No.6 or coarser.
2.The grain size of Grades TO304H,TO316H,TP321H,TP347H, and TP348H,as determined in accordance with Test Methods E112,shall be No. 7 or coarser.
3.The grain size of Grade UNS S32615,as determined in accordance with Test Methods E112, shall be No.3 or finer.
4.The grain size of N08810 and N08811,as determined in accordance with Test Methods E112,shall be 5 or coarser.
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