Hastelloy B-2 alloy is a ni-MO138-2118-5638 cycle alloy with very low carbon and silicon content. It reduces the precipitation of carbides and other phases in the weld and heat affected zone, thus ensuring good corrosion resistance even in the welded state. As is known to all, Hastelloy B-2 alloy has excellent corrosion resistance in various reducing media, and can withstand the corrosion of hydrochloric acid at any temperature and concentration under atmospheric pressure. It has excellent corrosion resistance in non-aerated medium concentration of non-oxidizing sulfuric acid, various concentrations of phosphoric acid, high temperature acetic acid, formic acid and other organic acids, bromic acid and hydrogen chloride gas. At the same time, it is also resistant to halogen catalyst corrosion. Therefore, Hastelloy B-2 alloy is usually used in a variety of harsh petroleum and chemical processes, such as the distillation of hydrochloric acid, concentration, alkylation of ethylbenzene and low pressure carbonyl synthesis of acetic acid.
The medium temperature thermal stability of Hastelloy B-2 alloy is poor. When the iron content in Hastelloy B-2 alloy drops below 2%, the alloy is sensitive to the transformation of phase 3 (i.e. Ni4Mo phase, an ordered intermetallic compound). When the alloy stays in the temperature range of 650~750℃ for a long time, the phase 3 is generated instantly. The presence of phase 3 reduces the toughness of Hastelloy B-2 alloy, makes it sensitive to stress corrosion, and even causes the cracking of Hastelloy B-2 alloy in raw material production (such as hot rolling process), equipment manufacturing process (such as integral heat treatment after welding of Hastelloy B-2 alloy equipment) and service environment. At present, the standard test method for intergranular corrosion resistance of Hastelloy B-2 alloy is normal pressure boiling hydrochloric acid method and weight loss method. As hastelloy B-2 alloy is resistant to hydrochloric acid corrosion, it is not sensitive to test the intergranular corrosion tendency of hastelloy B-2 alloy by boiling hydrochloric acid at atmospheric pressure. It is found that the corrosion resistance of Hastelloy B-2 alloy depends not only on its chemical composition, but also on the control process of hot working. When the hot working process is not controlled properly, not only the grains of Hastelloy B-2 alloy grow up, but also the high Mo σ phase appears in the intergranular phase. Under this condition, the intergranular corrosion resistance of Hastelloy B-2 alloy decreases obviously. In the HCL test, the grain boundary erosion depth of coarse-grained plate and normal plate differs about twice.

Nickel201 is an extremely low carbon commercial pure nickel approved for use in high-temperature environments up to 1230℃. Excellent plasticity and toughness, high chemical stability. Pure nickel is resistant to atmospheric, alkali and fresh water corrosion. It has excellent corrosion resistance in hot concentrated alkaline solution, medium and slightly acidic solution, organic solvent and other media. Not resistant to oxidizing acids and solutions containing oxidants and most molten metals. Sulfidation brittleness also occurs in high temperature sulfurous gases.

Ti-6al-4v (TC4) titanium alloy is a duplex alloy, with good comprehensive properties, good microstructure stability, good toughness, plasticity and high temperature deformation properties, can be better hot pressure processing, quenching, aging to strengthen the alloy. The strength after heat treatment is about 50% ~ 100% higher than that after annealing. High strength at high temperature, can work at 400℃ ~ 500℃ temperature for a long time, its thermal stability is inferior to α titanium alloy

Hastelloy B3 (N10675) is a nickel-based superalloy composed of nickel, molybdenum, cobalt and other elements, with a nickel content of about 65%. Hastelloy B3 (N10675) nickel-based alloy is a new material improved on the basis of Hastelloy B2, which improves the thermal stability of the material, thus improving the corrosion resistance, and at the same time, improves the hot forming and cold forming properties. In recent years, it has been more and more used in the production and manufacture of chemical equipment.
B-3 alloy is a new member of the nickel-molybdenum alloy family and has excellent corrosion resistance to hydrochloric acid at all temperatures and concentrations. It also has good corrosion resistance to sulfuric acid, acetic acid, formic acid, phosphoric acid and other non-oxidizing media.
Due to the adjustment of its chemical composition, its thermal stability is greatly improved compared with the original B-2 alloy. B-3 alloy has high resistance to pitting corrosion, stress corrosion, knife-edge corrosion and corrosion in the heat affected zone of welding. Excellent plastic properties can be maintained when exposed to medium temperature. Excellent pitting and stress corrosion cracking resistance; Excellent resistance to knife-edge corrosion and heat-affected zone corrosion; Excellent resistance to acetic acid, acetic acid, phosphoric acid and other non-oxidizing acids; Excellent resistance to hydrochloric acid corrosion at various concentrations and temperatures

Nickel201 is an extremely low carbon commercial pure nickel approved for use in high-temperature environments up to 1230℃. Excellent plasticity and toughness, high chemical stability. Pure nickel is resistant to atmospheric, alkali and fresh water corrosion. It has excellent corrosion resistance in hot concentrated alkaline solution, medium and slightly acidic solution, organic solvent and other media. Not resistant to oxidizing acids and solutions containing oxidants and most molten metals. Sulfidation brittleness also occurs in high temperature sulfurous gases.

Hastelloy C2000 The alloy is designed to resist a wide range of corrosive chemicals, including sulfuric, hydrochloric and hydrofluoric acids. Unlike the previously optimized Ni-Cr-Mo alloy, which can resist only oxidizing or reducing acids, C-2000 alloy has corrosion resistance in both environments. The combined action of molybdenum and copper (at 16% and 1.6% levels, respectively) gives the alloy excellent resistance to the corrosion of reducing media, while the high chromium content (23%wt) guarantees resistance to the corrosion of oxidizing media.

Nickel201 is an extremely low carbon commercial pure nickel approved for use in high-temperature environments up to 1230℃. Excellent plasticity and toughness, high chemical stability. Pure nickel is resistant to atmospheric, alkali and fresh water corrosion. It has excellent corrosion resistance in hot concentrated alkaline solution, medium and slightly acidic solution, organic solvent and other media. Not resistant to oxidizing acids and solutions containing oxidants and most molten metals. Sulfidation brittleness also occurs in high temperature sulfurous gases.

Hastelloy C2000 The alloy is designed to resist a wide range of corrosive chemicals, including sulfuric, hydrochloric and hydrofluoric acids. Unlike the previously optimized Ni-Cr-Mo alloy, which can resist only oxidizing or reducing acids, C-2000 alloy has corrosion resistance in both environments. The combined action of molybdenum and copper (at 16% and 1.6% levels, respectively) gives the alloy excellent resistance to the corrosion of reducing media, while the high chromium content (23%wt) guarantees resistance to the corrosion of oxidizing media.

Gr12 titanium molybdenum nickel alloy nominal composition is Ti-0.3Mo-0.8Ni, is the mid-1970s in the United States research and development of Ti-12 alloy, is a crack corrosion resistant titanium alloy, the alloy at 300℃ tensile strength is twice as high as pure titanium, corrosion resistance of reducing medium significantly improved, Crevice corrosion does not occur in chlorides at 150-200℃.