Investigation of Fabrication Procedures for 16Cr-8Ni-2Mo Wrought Materials
BABCOCK AND WILCOX CO ALLIANCE OH
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A wrought Cr-Ni-Mo austenitic stainless composition previously investigated for use as a welding electrode and designated as Croloy 16-8-2, was developed. It possesses creep and rupture strengths, in the temperature range of 1050 to 1350 F, which are equal to or greater than TP-304 and TP-321, while generally weaker than TP-347 and TP-316 stainless steels. Croloy 16-8-2 possessed a low yield strength at all test temperatures in combination with high ductility to fracture values and normal fracture strength levels. It was determined that 1350 F is the maximum safe long-time service temperature for Croloy 16-8-2, based upon oxidation characteristics. Intergranular corrosion tests show that aging up to 1500 hr at 1200 F did not eliminate intergranular corrosion while 75-hr aging at 1500 F provided intergranular corrosion resistance. No difficulty was experienced during the manufacture of hollow forgings or tubing of excellent quality.
- Fabrication Metallurgy
- Couplers, Fasteners and Joints