Hastelloy Hexagon Bolt

Hastelloy is a nickel-based corrosion-resistant alloy, mainly divided into nickel-chromium alloy and nickel-chromium-molybdenum alloy. Hastelloy fasteners have good corrosion resistance and thermal stability, and are mostly used in the aviation industry and the chemical field.

Hastelloy grades include the following grades:

HASTELLOY B-2 nickel-molybdenum alloy has excellent corrosion resistance in a reducing environment. The upgraded version of HASTELLOY B-3 B-2 has excellent corrosion resistance to any temperature and concentration of hydrochloric acid.

HASTELLOY C-4 has better thermal stability, 650-1040 degrees Celsius has better toughness and corrosion resistance.

HASTELLOY C-22 has better uniform corrosion resistance in oxidizing media than C-4 and C-276, and excellent local corrosion resistance. HASTELLOY C-276 has good resistance to oxidizing and moderately reducing corrosion, and excellent stress resistance Corrosion ability.

HASTELLOY C-2000 is the most comprehensive corrosion-resistant alloy with excellent resistance to uniform corrosion in both oxidizing and reducing environments.

HASTELLOY G-35 G-30 is an upgraded product with better corrosion resistance and thermal stability. HASTELLOY G-30 is a nickel-based alloy with high chromium content. It is excellent in phosphoric acid and other strong oxidizing mixed acid media.

HASTELLOY X combines high strength, anti-oxidation and easy processing characteristics.

Each of the above grades has a specific chemical composition, mechanical properties, and has its own strengths. It is not possible to generalize about the characteristics of Hastelloy.

Mechanical properties

1. Hastelloy comes from Hastelloy, starting from Hastelloy B, which is used in rocket nozzles of aircraft; subsequent Hastelloy C has been applied and promoted in the chemical industry, petrochemical industry, nuclear energy industry and pharmaceutical industry; followed by Hastelloy The X-alloy exhibits excellent high temperature resistance, accompanied by the rapid growth of the jet aircraft industry.

2. Since the early Hastelloy B, Hastelloy C, and Hastelloy X alloys need to be solution treated after welding, otherwise, the corrosion resistance of the welding heat affected zone will be greatly reduced; so the above alloys have been gradually improved or No longer use;

3. The key reason that affects the welding performance of the above materials is the content of C and Si. Due to the emergence and improvement of refining technology, the problems of Hastelloy welding have been improved, so many improved Hastelloy B series are being promoted and used. C series alloys, etc. It is very regrettable that many Hastelloy production and promotion units instead replace the earlier Hastelloy alloy with the later improved Hastelloy alloy, not only does not reduce the C and Si content, but returns to the previous high Si, high C content; the promotion of special steel business has a long way to go.

4. Hastelloy B series alloys with reducing medium resistance have been improved on the basis of Hastelloy B brand. The focus of the improvement includes extremely low C and Si content to improve the performance of the welding area, further alloying ideas, and purifying molten steel ideas. Applications such as Hastelloy B-2, Hastelloy B-3, Hastelloy B-4 alloys; Hastelloy B-2 alloy has solved the performance problem of welding area to a certain extent; Hastelloy B -3 solved the shortcomings of Hastelloy B-2 easy precipitation Ni-Mo precipitation hardening, greatly improved the performance of hot work and cold work.

5. In the process of improving Hastelloy B series materials for reducing environment; Hastelloy C series alloys in the redox composite environment are also continuously improving, among which Hastelloy C276 alloy has improved to a certain extent due to lower C and Si content. The welding area performance problem is still not satisfactory, and the processing performance cannot be improved. The Hastelloy C22 material completely solves the problem of corrosion resistance and processing performance in the welding area, mainly because the material cost does not increase. It has been solved on the basis of, so the Hastelloy C22 material is the most cost-effective material in the Hastelloy C series, and will be used in larger batches in the future; and the newly developed Hastelloy C2000 material has Cu added to the alloy, which expands Hastelloy The corrosion ability of the C alloy in a reducing environment provides the possibility of safer use, higher equipment life requirements, and new technology trial production occasions.

Hastelloy is an ultra-low carbon type, Ni, Mo, Cr series nickel-based, corrosion-resistant, high-temperature resistant material Hastelloy (Hastelloy), because it has excellent high temperature resistance, oxidation resistance, resistance to weld affected area It is corrosive, has good long-term thermal stability and processability, and is used in harsh industrial environments such as agricultural chemicals, nuclear facilities, and biopharmaceuticals. It also has excellent corrosion resistance, uniform corrosion resistance and intergranular corrosion resistance in the medium of wet oxygen, sulfurous acid, acetic acid, formic acid and strong oxide salts, so it is also widely used in the chemical industry. The electrical conductivity and thermal conductivity of gold are much lower than that of low-carbon steel, while the electrical resistivity and expansion rate are much higher than that of low-carbon steel. The flowability of the molten pool is poor, the wettability is poor, the penetration force is small, and the penetration depth is shallow.

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