What are the characteristics of alloy59 material? What are the main applications?

Material grade: Alloy 59 Nickel-based alloy

American brand: UNS N06059

German brand: 2.4605

I. Overview of Alloy 59( N06059) Nickel-based Alloy:

Alloy 59 (N06059) Nickel-based alloy is a kind of Ni-Cr-Mo alloy with extremely low silicon and carbon content, excellent corrosion resistance and extremely high mechanical strength. Alloy 59( N06059) nickel-based alloy tool also has the following characteristics:

1, excellent resistance to pitting corrosion, crevice corrosion and stress corrosion cracking caused by chloride.

2. Excellent corrosion resistance to inorganic acids, such as nitric acid, phosphoric acid, sulfuric acid and hydrochloric acid, especially the mixture of sulfuric acid and hydrochloric acid.

3. Excellent corrosion resistance of various inorganic acid mixed solutions.

4. It has good corrosion resistance in hydrochloric acid solutions with various concentrations up to 40℃( 104℉).

5, with good machinability and weldability, no post-weld cracking sensitivity.

6. Pressure vessel manufacturing certificate with wall temperature of-196 ~ 450℃.

7. It has passed the NACE standard (MR-0 1-75) certification of American Institute of Corrosion Engineers, and meets the highest standard level VII used in acid gas environment.

Two. Chemical composition of alloy 59( N06059) nickel-based alloy: see table-1:

Three. Mechanical properties of Ni-based alloy 59( N06059):

1 and alloy 59( N06059) nickel-base alloy density: 8.6g/cm3.

2. Melting point of alloy 59( N06059) nickel-based alloy:1310-1360℃.

3. Tensile strength of alloy 59( N06059) nickel-based alloy: σ0.2≥690Mpa,

4. Yield strength of alloy 59( N06059) nickel-based alloy: σb≥340Mpa,

5. Elongation of alloy 59( N06059) nickel-based alloy: δ≥40,

Four. Corrosion resistance of alloy 59( N06059) nickel-based alloy;

Nickel-based alloy 1 and alloy 59( N06059) have extremely low carbon and silicon contents, and there is no tendency of impurity phase precipitation during hot working and welding, so they are suitable for various chemical processing industries containing oxidation and reduction media. The high content of molybdenum and chromium makes the alloy resistant to chloride ion corrosion.

2. In most standard corrosion tests of alloy 59( N06059) Ni-based alloy in oxidizing environment, the performance of Nicrofer 5923 hMo is higher than that of other Ni-Cr-Mo stainless steels. The corrosion rate of Ni-based alloy 59( N06059) in some reducing environments (such as boiling 10% sulfuric acid) is more than three times lower than that of conventional Ni-Cr-Mo stainless steel, and it is also suitable for chemical process industry in reducing environments. Alloy 59( N06059) nickel-based alloy has excellent corrosion resistance in hydrochloric acid.

3.59 Alloy (N06059) Nickel-based alloy materials can have the best corrosion resistance only if they have suitable metallographic state and pure crystal structure.

Verb (abbreviation of verb) processing and heat treatment of alloy 59( N06059) nickel-based alloy;

Alloy 59( N06059) nickel-based alloy has good cold working, hot working and machining properties.

1, heating:

(1), before and during heat treatment, the workpiece should always be kept clean and pollution-free.

(2) Do not touch low melting point metals such as sulfur, phosphorus and lead during heat treatment, otherwise the performance of alloy 59( N06059) will be damaged, and pay attention to removing pollutants such as marking paint, temperature indicating paint, colored crayons, lubricating oil and fuel oil.

(3) The lower the sulfur content in fuel, the better. The sulfur content in natural gas should be less than 0. 1%, and that in heavy oil should be less than 0.5%.

(4) Considering the need of temperature control and cleanliness, it is best to conduct heat treatment in a vacuum furnace or a gas shielded furnace.

(5) It can also be heated in a box furnace or a gas furnace, but the furnace gas must be clean and neutral to slightly oxidized. The fluctuation of furnace gas between oxidation and reduction should be avoided, and the heating flame cannot burn directly on the workpiece.

2, hot processing:

The hot working temperature range of (1) alloy 59( N06059) alloy is 1 180℃ ~ 950℃, and the cooling mode is water cooling or rapid air cooling.

(2) In order to ensure the best anticorrosion performance, heat treatment should be carried out after hot working, and the workpiece should be directly added into the heated heat treatment furnace.

3. Cold working:

The work hardening rate of (1) Alloy 59( N06059) alloy is higher than that of austenitic stainless steel, so it is necessary to select processing equipment. The workpiece should be annealed, and there should be intermediate annealing during cold rolling.

(2) If the cold rolling deformation is greater than 15%, it is necessary to carry out solid solution treatment on the workpiece.

4, heat treatment:

The solution treatment temperature range of (1) and Alloy 59( N06059) alloys is1100℃ ~1/80℃.

(2) For materials with thickness less than 1.5mm, it is suggested to adopt water quenching or rapid air cooling to ensure the best corrosion resistance.

(3) During all heat treatment, the workpiece should be directly put into the heated heat treatment furnace, and the workpiece must be kept clean.

5. In proportion:

The adhesion of surface oxides of (1) and Alloy 59( N06059) alloys to welding slag around the weld is stronger than that of stainless steel, so it is recommended to use fine abrasive belt or fine grinding wheel for grinding.

(2) Before pickling with mixed acid of nitric acid and hydrofluoric acid for a proper time and temperature, the oxide film must be carefully polished or pretreated in a salt bath to break.

6. Machining: Alloy 59( N06059) shall be machined after heat treatment. Because of the work hardening of the material, it is suggested to use a lower cutting speed and re-feeding tool than low alloy standard austenitic stainless steel before turning the cold hardened surface layer.

7. Welding suggestion: When welding nickel-based materials, the following procedures should be followed:

(1). Workplace The workplace should be separated or far enough away from the carbon steel processing area, kept as clean as possible, equipped with partitions and avoid ventilation between the two areas.

(2), work clothes and accessories should wear clean fine-grained leather gloves, wearing clean work clothes.

(3) Tools and mechanical equipment should have special tools, which are made of nickel-base alloy and nickel-chromium steel, wire brushes are made of stainless steel, and mechanical equipment such as scissors, punches and rolling mills should be covered with felt, cardboard or plastic paper to prevent iron and carbon metals from falling on the surface of the machine and sticking to the processed materials, causing corrosion.

8. Cleaning: The materials to be welded should be in the state of solid solution treatment to remove scale, oil stain and various marks. The parent metal and filler alloy (such as covered electrode) in the welding area shall be cleaned with acetone, and it shall be noted that trichloroethylene, tetrachloroethylene and carbon tetrachloride shall not be used.

9. Edge preparation: It is best to use mechanical processing, such as turning, milling and planing, or plasma cutting. If the latter is adopted, the cutting edge (welding surface) must be polished clean and smooth, allowing fine grinding without overheating.

10, groove angle: Compared with carbon steel, the physical properties of nickel-based alloy and special stainless steel are mainly low thermal conductivity and large expansion coefficient, which should be considered when preparing welding groove, including widening the bottom gap (1 ~ 3 mm), and at the same time, due to the viscosity of molten metal, a larger groove angle (60 ~ 70) should be adopted for butt welding.

1 1. Arc striking: Arc striking should be carried out in the welding area of the workpiece, that is, the welding surface, to prevent the arc striking point from corrosion.

Welding process: Alloy 59( N06059) can be welded with the same material or other metals, and is suitable for any traditional welding process, such as tungsten inert gas welding, plasma arc welding, manual sub-arc welding, metal inert gas welding and metal inert gas welding, and pulse sub-arc welding technology is preferred. When manual arc welding is used, it is recommended to use the mixed shielding gas of Ar+He+H2+CO2.

13. Filled metal: For gas shielded welding, it is recommended to use covered electrode with the same chemical composition as the base metal. Commonly used welding wire: ERNiCrMo- 13 coated covered electrode: ENiCrMo- 13.

Application scope of intransitive verb alloy 59( N06059) nickel-based alloy;

Alloy 59( N06059) is widely used in chemistry, petrochemical industry, energy manufacturing and pollution control. Typical applications are as follows:

1, especially when acyl chloride catalyst is used. 2. Boilers and bleaching equipment in pulp and paper industry. 3. Scrubbers, reheaters, throttle valves, wet steam fans and mixers in 3.FGD and IG systems. 4. Equipment and components operating in acid gas environment. 5. Acetic acid and acetic anhydride product reactors. 6. Sulfuric acid condenser.