What is GH3536 Superalloy (Hastelloy X alloy)

Since 2022, Russia-Ukraine geopolitical conflicts have intensified, and global energy prices have risen sharply, with international natural gas prices hitting historic highs. As the most important transitional energy source in the transition from fossil energy to non-fossil energy, the share of natural gas in primary energy has increased from 14.6% in 1965 to 24.7% in 2020.  The global gas price indices showed a unilateral downward trend from 2018, bottomed out in 2020, and remained low for a long time. However, since July 2020, the global gas prices have gradually fluctuated upward, and the impact of geopolitical events made the Dutch TTF gas price even hit record highs repeatedly.

An analyst of a securities company believes that the core catalyst of this round of global gas market lies in the lack of investment in upstream oil and gas resources caused by long-term low prices. Since 2020, although the epidemic has led to a decline in demand, the decline in supply has been faster, resulting in a large inventory consumption. In 2021, demand will recover faster than supply (the supply-side is less sensitive to prices, which will be reflected in investment).  

As the world's two largest gas Hastelloy X alloy are also expected to change significantly.

What is GH3536 superalloy (Hastelloy X alloy)

GH3536 (Hastelloy X alloy) is a nickel-based superalloy with high iron content mainly solid solution strengthened by chromium and molybdenum. It has good oxidation resistance and corrosion resistance, and has moderate durability and creep below 900 ℃. Strength, cold and hot workability and good weldability. Used in the manufacture of combustion chamber parts and other high-temperature parts of aero-engines, long-term use below 900 °C, and short-term operating temperature can reach 1080 °C. The main varieties supplied are plates, strips, pipes, bars, forgings, rings and precision castings.

GH3536 (Hastelloy X alloy) process performance and requirements

GH3536 (Hastelloy X alloy) formability alloy has good cold and hot forming properties. Forging heating temperature 1170℃±10℃, final forging temperature not lower than 950℃; slab hot rolling heating temperature 1150℃±10℃, final rolling temperature not lower than 850℃; ring hot rolling heating temperature 1170℃±10℃ .

GH3536 (Hastelloy X alloy) welding performance This alloy has good welding process performance, and can be welded by argon arc welding, seam welding and spot welding. HGH3536 or HGH3113 wire is recommended for argon arc welding.

The microstructure of the alloy in the solid solution state is an austenite matrix with a small amount of TiN and M6C carbides. After long-term aging at 700～900℃, the main precipitation phases are M12C and M3B2, accompanied by trace μ phase and L phase. After aging at 700℃ for 200h, a small amount of σ phase appeared, but after aging at 800℃, the σ phase did not exist, and a small amount of M23C6 was precipitated, and sometimes a small amount of L phase appeared. Therefore, the alloy exhibits a certain degree of age hardening after long-term aging, which reduces the plasticity and the high temperature strength.

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Europe has been facing the gas shortage problem since the second half of 2021. The worsening situation in Russia and Ukraine has reduced Russian gas shipments to Europe, leading to a doubling of European gas prices. Energy shortages have sent electricity prices soaring. For these reasons, it is predicted that the price of the Hastelloy X alloy will continue to increase.

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