S9074-AR-GIB-010/278
6.4.6 Titanium and titanium alloys. 6.4.6.1 General heat treating requirements. For furnace equipment requirements, heat treating procedures, minimum metal removal after exposure to high temperatures, and general information refer, to MIL-H-81200. 6.4.6.2 Stress relieving. When required for dimensional stability, S-51 and S-52 materials shall be stress relieved in the temperature range of 900° to 1100°F for 1-1/4 hour per inch within the range of 1/4 to 4 hours. S-53 materials shall be stress relieved in the temperature range of 900° to 1200°F for 1 hour per inch, within the range of 1 to 4 hours. 6.4.6.3 Annealing. When required to improve ductility, dimensional or thermal stability, fracture toughness, and creep resistance, S-51 and S-52 materials shall be annealed in the temperature range of 1200° to 1400°F for 1-1/4 hours per inch, within the range of 1/3 to 2 hours. S-53 material shall be annealed in the temperature range of 1275° t to 1500°F for 1 hour per inch, within the range of 1/3 to 2 hours. 6.5 Special requirements for welding and forming S-11 steels and special treatment steels (STS). Welding and forming of HY/HSLA steels and STS steels shall be in accordance with MIL-STD-1681, MIL-STD-1688 or MIL-STD-1689, as applicable. Preheat and interpass temperatures, filler metal selection, and postheat temperature and holding time for MIL-S-23284 steel shall conform to the requirements of MIL-STD-2191; welding procedure qualification shall employ HIL-S-23284 steel unless otherwise approved by NAVSEA. 6.5.1 Special requirements for welding with MIL-120 and MIL-140 series filler materials. Except for MIL-STD-2191 applications and handling and storage of MIL-12018 electrodes (see 6.6), additianal requirements shall be as approved by NAVSEA for welding with MIL-120 and MIL-140 series filler materials. These additional requirements involve at least the following items: (a) Heat input(minimum and maximum)requirements. (b) Heat soaking requirements of welds and weld repairs (as required). (c) Preheat and interpass temperature (minimum and maximum) requirements. (d) Loss of preheat or heat soak and weld removal requirements. (e) Ordering requirements. (f) Receipt inspection of welding filler materials. (g) Weld repairs of base material. (h) Weld repairs using undermatching filler in lieu of MIL-120 or MIL-140 series filler materials. 6.6 Electrode handling and storage. 6.6.1 General. Welding electrodes, including covered types and bare spooled electrode (wire form) shall be handled so as to prevent damage. Where containers show evidence of damage, their contents shall be examined and electrodes with cracked or flaked-off coatings, or damaged spools of filler metal shall not be used for production welding. Covered electrodes and bare electrodes (wire form) and rods
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