Cold Worked Hastelloy G30 (UNS N06030)
Cold forming can be performed using standard tools; however, the use of ordinary carbon tool steel is not recommended because it is prone to galling. Soft die materials (such as bronze, zinc alloys, etc.) minimize wear and provide a good surface finish, but die life will be slightly shorter. In long-term production, alloy tool steels (D-2, D-3) and high-speed steels (T-1, M-2, M-10) perform well, especially when hard-chromium plated to reduce wear. Tools must have sufficient clearance and radii to be considered. Strong lubricants should be used to minimize wear during all forming operations. For materials no thicker than 1/180 inch, the 1-degree bend of the sheet is typically limited to a bending radius of 8T; for materials thicker than 1/2 inch, the bending radius is limited to 8T. To avoid surface effects such as “orange peel,” the reduction in area due to cold working should be at least 15% in any process. Intermediate annealing may be performed during a series of cold forming operations to restore ductility.
Heat Treatment of Hastelloy G30 (UNS N06030)
G-30 forgings undergo solution treatment. During solution treatment, they are heated to 1177 °C and then rapidly cooled in air or water. Hot-formed components must undergo solution treatment prior to final assembly.
Applications of the Nickel-Based Alloy Hastelloy G30 (UNS N06030)
The G-series nickel-based alloys (G3, G30, G35) are primarily used in the petrochemical industry, such as in oil well casing, evaporators used in the production of wet-process phosphoric acid, nuclear fuel reprocessing equipment in the nuclear industry, and acid pickling equipment for steel. The C-series alloys (C276, C22, C4) are among the most commonly used corrosion-resistant alloys, exhibiting excellent corrosion resistance in both oxidizing and reducing environments. Consequently, they are widely used in various complex corrosive environments, such as the nuclear and pharmaceutical industries. Alloy C276 is a very important nuclear material and is an indispensable component for steam pipes in nuclear power plants. It is a core material with outstanding resistance to stress corrosion cracking.
In oil and gas drilling, in addition to drilling machinery and equipment, specialized tubing is required, collectively referred to as “drill string,” “casing,” and “tubing.” Oil well tubing accounts for approximately 690% of the total steel consumption in the oil and gas industry and is a vital component of oil and gas development. Given the unique characteristics of China’s oil and gas production environment, experts believe that ultra-high-strength tubing, high-strength tubing, corrosion-resistant tubing for acidic environments, and special threaded tubing are the high-performance tubing products most urgently needed in China today.
For a long time, the primary materials used for oil well tubing in China have been 40Cr, 13Cr, 22Cr, and 25 Stainless Steel. These stainless steels feature high strength and high chromium (Cr) content. A dense Cr₂O₃ passivation film readily forms on the alloy surface, effectively resisting CO₂ corrosion; as the chromium content increases, the ability to resist CO₃ corrosion also gradually improves. However, with the gradual discovery and development of deep, highly acidic oil and gas fields, and the increasing concentrations of H₂S, CO₂, S, and C₂ in the mining environment, conventional stainless steel pipes can no longer meet the demands of mining operations. Therefore, high-alloy nickel-based corrosion-resistant alloys (1600, G-825, 3250, 050, C625) have gradually been adopted for oil well tubing. The G276 alloy is a nickel-based corrosion-resistant alloy with excellent performance. The Ni-Cr-Fe system, which includes Mo and Cu, exhibits excellent oxidation resistance, atmospheric corrosion resistance, and resistance to stress corrosion cracking. Due to its high Fe content, it offers a cost advantage compared to other nickel-based corrosion-resistant alloys. Oilfield tubing made from this alloy demonstrates superior resistance to H₂S, CO₂, and Cl corrosion, making it an ideal choice for acidic gas fields. With the gradual development of acidic oil and gas fields, the demand for nickel-based alloy oil and gas tubing continues to rise. Some foreign manufacturers of nickel-based corrosion-resistant alloy tubing have not yet fully mastered the production of these products, posing a serious threat to national energy security. Therefore, domestic production of nickel-based alloy tubing is of critical importance.
Contact Now
