Hastelloy

Hastelloy is a nickel-based corrosion-resistant alloy, which is mainly divided into two categories: nickel-chromium alloy and nickel-chromium-molybdenum alloy. Hastelloy has good corrosion resistance and thermal stability, and is mostly used in aviation and chemical fields.

Hastelloy is a nickel-based corrosion-resistant alloy, which is mainly divided into two categories: nickel-chromium alloy and nickel-chromium-molybdenum alloy. Hastelloy has good corrosion resistance and thermal stability, and is mostly used in aviation and chemical fields.

American company

The company’s predecessor Haynes Stellite Work (Hartz Cobalt-Chromium-Tungsten Factory) was founded in Kokomo, Indiana, USA in 1921. It has a history of 92 years and has continued to innovate and invent through more than 90 years of production and research. As a result, it ranks first in the world in the field of high alloys.

Haynes International focuses on product production and development. Mainly engaged in the development and production of high-quality corrosion-resistant and high-temperature resistant nickel-cobalt alloys. The company’s expert technicians provide further customer service and technical support worldwide. Haynes’ service centers and branches can provide customers with plates, bars, pipes, forgings, flanges and connectors in a timely manner.

Hastelloy Definition

Hastelloy (Hastelloy alloy) is the general name of the commercial brands of nickel-based corrosion-resistant alloys produced by Hastelloy International Corporation in the United States. Including nickel-molybdenum-based Hastelloy B-2, nickel-chromium-molybdenum-based Hastelloy C-4, etc.

Hastelloy grades include the following grades:

HASTELLOY B-2 nickel-molybdenum alloy has excellent corrosion resistance in reducing environments

The upgraded version of HASTELLOY B-3 B-2 has excellent corrosion resistance to hydrochloric acid of any temperature and concentration.

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

HASTELLOY C-22 has better resistance to uniform corrosion in oxidizing media than C-4 and C-276, and excellent resistance to localized corrosion. HASTELLOY C-276 has good resistance to oxidizing and moderately reducing corrosion, and has excellent resistance to stress. Corrosion ability. HASTELLOY C-2000 The most comprehensive corrosion-resistant alloy with excellent uniform corrosion resistance in both oxidation and reduction environments.
An upgraded product of HASTELLOY G-35 G-30, with better corrosion resistance and thermal stability

HASTELLOY G-30 Nickel-based alloy with high chromium content, excellent performance in phosphoric acid and other strong oxidizing mixed acid media.

HASTELLOY X combines the characteristics of high strength, oxidation resistance and easy processing. Each of the above grades has specific chemical composition, mechanical properties, and each has its own strengths. It is not possible to generalize on the characteristics of Hastelloy.

The Use Of Hastelloy

Hastelloy plates are suitable for various chemical industries containing oxidizing and reducing media. The higher content of molybdenum and chromium makes the alloy resistant to chloride ion corrosion, and the tungsten element further improves the corrosion resistance. At the same time, C-276 Hastelloy tube is one of the only materials resistant to corrosion by moist chlorine, hypochlorite and chlorine dioxide solutions. Significant corrosion resistance.

Application fields, heat exchangers, bellows compensators, chemical equipment, flue gas desulfurization and denitrification, paper industry, aerospace applications, acidic environment

The Characteristic Of Hastelloy

• ① It has excellent corrosion resistance to most corrosive media in both oxidation and reduction atmospheres.
• ②It has excellent resistance to pitting, crevice corrosion and stress cracking corrosion.

The Mechanical Properties Of Hastelloy

1. Hastelloy comes from Hastelloy, which started with Hastelloy B alloy and is used in aircraft rocket nozzles; the subsequent Hastelloy C alloy has been applied and promoted in the chemical industry, petrochemical industry, nuclear energy industry and the pharmaceutical industry; The X alloy exhibits excellent high temperature resistance, which is accompanied by the rapid growth of the jet aircraft industry.
2. Since the early Hastelloy B, Hastelloy C, and Hastelloy X alloys require solution treatment 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 affecting the welding performance of the above materials is the content of C and Si. Due to the emergence and improvement of refining technology, the welding problems of Hastelloy alloys have been improved, so there are many improved Hastelloy B series that are being promoted. It’s a pity that many Hastelloy production and promotion units have replaced the earlier Hastelloy alloys with the later improved Hastelloy alloys. Not only did not reduce the C and Si content, but instead returned to the previous high Si, high C content; the promotion of special steel business has a long way to go.
4. The Hastelloy B series alloys resistant to reducing media are improved on the basis of Hastelloy B grades. 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 In this way, Hastelloy B series has Hastelloy B-2, Hastelloy B-3, Hastelloy B-4 alloys; among them, Hastelloy B-2 alloy solves the welding area performance problem to a certain extent; Hastelloy B -3 solves the shortcomings of Hastelloy B-2 that it is easy to precipitate Ni-Mo precipitation hardening, and greatly improves the hot working and cold working performance.
5. In the process of improving the Hastelloy B series of materials used in reducing environments; the Hastelloy C series alloys in the redox compound environment are also continuously improving, and the Hastelloy C276 alloy is improved to a certain extent due to the lower C and Si content The performance problem of the welding area is solved, but it is still not satisfactory, and the processing performance has not been improved. The Hastelloy C22 material has completely solved the corrosion resistance of the welding area, the processing performance problem, and the main reason is that the material cost does not increase. 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 adds Cu to the alloy, which expands the The corrosion ability of C alloy in a reducing environment provides the possibility for safer use, higher equipment life requirements, and new process 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, and weld-affected zone resistance 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 oxidizing salts. Therefore, 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 resistivity and expansion rate are much higher than that of low-carbon steel. The molten pool has poor fluidity, poor wettability, low penetration and shallow penetration.

The Classification Of Hastelloy

Hastelloy alloy (Hastelloyalloy) is mainly divided into three series, B, C, and G. It is mainly used in iron-based Cr-Ni or Cr-Ni-Mo stainless steel, non-metallic materials and other applications with strong corrosive media that cannot be used.

Hastelloy grades

In order to improve the corrosion resistance and cold and hot workability of Hastelloy, Hastelloy has undergone three major improvements. The development process is as follows:

• B series: B→B-2(00Ni70Mo28)→B-3
• C series: C→C-276(00Cr16Mo16W4)→C-4(00Cr16Mo16)→C-22(00Cr22Mo13W3)→C-2000(00Cr20Mo16)
• G series: G→G-3(00Cr22Ni48Mo7Cu)→G-30(00Cr30Ni48Mo7Cu)

The most widely used are the second-generation materials N10665 (B-2), N10276 (C-276), N06022 (C-22), N06455 (C-4) and N06985 (G-3)