Introduction to Inconel625

• Alloy Inconel 625 is a commonly used high temperature special alloy. Shanghai HY-industry is committed to improving all aspects of the alloy in the manufacturing process. The company is equipped with advanced smelting equipment and perfect management system, which strictly controls quality in both material selection and smelting process. Close, to ensure that the produced Inconel625 is a high quality alloy, then how much do you know about the properties of Inconel625 alloy?

Inconel625 Material Description:

Inconel 625 is a solid solution strengthened nickel-based deformed alloy with Mo and Nb as main strengthening elements. It has good durability, fatigue resistance, oxidation resistance and corrosion resistance below 650 °C. Good strength and toughness from low temperature to 1095 °C temperature range. Cold working can be used to increase the strength of the alloy. The alloy is resistant to chloride stress corrosion cracking. Can be used as a jet engine component, aerospace structural components and chemical equipment. Inconel 625 chemical composition: molybdenum ruthenium is the main strengthening element, nickel is the balance element, the chemical composition is shown in the table below：

HY 625 Material grades and equivalents

Inconel 625/ GB NS336 / UNS N06625/ SEW VDIUV  W.Nr.2.4856 NiCr22Mo9Nb / BS NA 12 / AFNOR NC22DNB

HY 625 Chemical composition

HY 625 Pysical properties

HY 625 Alloy m inimum mechanical properties in the room temperature

Characteristic as below

1. Excellent corrosion resistance of different kinds of media in both oxidation and reduction environments.
2. Excellent resistance of pitting and crevice corrosion, and won’t happen stress corrosion cracking because of chloride.
3. Excellent resistance of the inorganic acid corrosion performance, such as nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid and the mixture of sulfuric acid and hydrochloric acid.
4. Excellent corrosion resistance of different kinds of inorganic acid mixture performance.
5. Good corrosion resistance of a variety of concentrations of hydrochloric acid when the temperature up to 40°C .
6. Good machining and welding, no weld cracking sensitivity.
7. Have pressure vessel authentication for the wall temperature between -196 ~ 450°C .
8. Apply for the highest standard lever VII of acidic environment by the NACE ( MR-01-75) authorized.

HY 625 Corrosion resistance

625 own a very good corrosion resistance in many media, especially with excellent resistance to pitting, crevice corrosion, intercrystalline corrosion, and erode in oxide, also good resistance to inorganic acid corrosion, such as nitric acid, phosphoric acid, sulfuric acid and hydrochloric acid. 625 can resist the alkali and organic acid corrosion in the oxidation and reduction environment. Effect resists the chloride reduction stress corrosion cracking. Normally no corrosion in the sea-water and industry environments since high corrosion resistance to the sea-water and salting liquid,as well as in high temperature, without sensitivity during welding. 625 have the resistance to oxidation and carbonizing in the static and cycle environments, also hacve the resistance the chlorine corrosion.

HY 625 Application field
Soften annealing low carbon alloy 625 widely used in the chemical process industry, good corrosion resistance and high strength made it an good choice for structural parts. 625 have application in sea-water for local mechanical stress attach.

HY 625 Typical application field as below

1. Organic chemical process parts contains chloride, especially in the use of acid chloride catalyst.
2. Digester and bleacherin the use of paper pulp and paper making industry.
3. Absorption tower, re-heater,gas import board, fan, blender, fair water fin, flue and so on for using in flue gas desulfurization system.
4. Equipment and parts in the use of acidic gas environments.
5. Acetic acid and anhydride reaction generator
6. Sulfur acid cooling

Specifications：

Inconel625 forging process:

• HY-industry recommends: Inconel625 alloy forging heating temperature is 1120 ° C, opening and forging temperature is not lower than 1030 ° C, stop forging temperature is not lower than 930 ° C; when die forging, the final deformation should be not less than 15% to 20%. The rolling heating temperature is 1120～1160°C, the rolling rolling temperature is not lower than 1050°C, the stopping rolling temperature is not lower than 930°C, the deformation of the thin-plate cold-rolled semi-finished product is 25%-30%, and the finished product deformation is not less than 30%. The intermediate and finished product quenching temperature is 1100 °C ± 10 °C.

Inconel625 parts heat treatment process:

• Stress relief: 900 ° C; annealing: 930 ~ 1040 ° C, 1 h; solution treatment: 1090 ~ 1200 ° C, air or water cooling. When the alloy is operated at not higher than 650 ° C, materials in hot rolled, cold rolled or annealed state may be used as required. When the working temperature is above 650 °C, the parts requiring good fatigue performance and tensile strength can be annealed, and parts requiring better creep and long-lasting performance can be solution treated.

• Inconel 625 alloys have a low corrosion rate in both marine and non-ocean atmospheres, are essentially free of corrosion in fresh water, and are resistant to seawater corrosion.

• Inconel 625 alloy is also resistant to corrosion by various salt solutions. In addition, it has good resistance to nitric acid and phosphoric acid corrosion, and it is also resistant to corrosion to hydrochloric acid below the boiling point and low concentration of sulfuric acid.

Highlighted:

• When Inconel 625 alloy is operated at 650 ° C or below, it is recommended to use hot rolled, cold rolled or factory annealed materials as required. Since the alloy still has good plasticity and toughness at very low temperatures, the tensile properties of the alloy can be improved by cold working for use at medium temperatures. When the alloy is operated at 650 ° C or higher, it is preferably used in an annealed state or a solid solution state. When the component is required to have good creep and long-lasting properties, it is preferred to use it in a solid solution state. The fine grain material has better fatigue strength, hardness, yield strength and tensile strength below 815 °C.

• The heat treatment of the Inconel 625 alloy should be carried out in a sulfur-free weak reducing atmosphere in which the content of carbon monoxide is not less than 2%.

• Inconel 625 alloy has good soldering properties and is easy to solder in either a tungsten or a self-contained Inconel 625 under a protective atmosphere. The brazing test (1120 ° C, 15 minutes) of the cold-rolled annealed sheet was carried out in a dry hydrogen gas (-46 ° C) using a resistance brazing alloy (AWS-ASTM Class Ni-1), and the results were good. In order to maintain the corrosion resistance of the alloy, no heat treatment is performed after welding.

HY-industry is qualified  Nickelalloy&cobalt alloy materials supplier.We have more than twenty years experience in kind of nickel base alloy production.Inconel 625 is one of our main products

When you want to know more about our products, please contact us:

https://hynickelalloy.com/