NS336 corrosion resistant alloy Plate,Roll,Steel belt,Great,Tube,Forging

1、 NS336 (Inconel625, N06625, 2.4610) Corrosion resistant alloy Overview:

NS336 (Inconel625, N06625, 2.4610) alloy is a solution strengthened nickel base deformed superalloy with molybdenum and niobium as the main strengthening elements. It has excellent corrosion resistance and oxidation resistance. It has good tensile and fatigue properties from low temperature to 980 ℃, and is resistant to stress corrosion in salt spray atmosphere. Therefore, it can be widely used to manufacture aeroengine components, aerospace structural components and chemical equipment. The alloy has good processing and welding properties, and can supply various plates, bars, pipes, wires, strips and forgings.

1. NS336 (Inconel625, N06625, 2.4610) alloy material grade: NS336.

2. NS336 (Inconel625, N06625, 2.4610) Similar brands: GH3625 (GH625) (China), UNS NO6625 (United States), etc.

3. Technical standards of materials

4. Chemical composition of NS336 (Inconel625, N06625, 2.4610) alloy: see Table 1-1.

                                                                  Table 1-1

5. Heat treatment system of NS336 (Inconel625, N06625, 2.4610) alloy: bar: 950 ～ 1030 ℃, air cooling or water cooling; Or 1090~1200 ℃, air cooling or water cooling solution treatment. Plate: 950~1030 ℃, air cooling; Or 1090~1200 ℃, air cooling. Pipe: Recommended annealing temperature: 960~1030 ℃, air cooling or water cooling.

6. NS336 (Inconel625, N06625, 2.4610) alloy variety specification and supply status: d25-80mm bars and δ 0.8-10.5mm plate, d6-40mm seamless (welded) pipe can also be supplied. Bars are not subject to heat treatment but are delivered in the finished or polished state; The plates shall be supplied after solution and finishing; The pipes shall be supplied after solution, pickling (or bright annealing).

7. NS336 (Inconel625, N06625, 2.4610) alloy smelting and casting process: the alloy is produced by vacuum induction furnace melting plus electroslag remelting or vacuum induction furnace plus vacuum arc remelting.

8. Application overview and special requirements of NS336 (Inconel625, N06625, 2.4610) alloy: This alloy is used to manufacture engine casing, guide vane, mounting edge, cylinder, fuel header and other parts, and has passed the practical application assessment, with the maximum service temperature of 950 ℃; The alloy has a certain age hardening phenomenon after being used for a long time at 550~700 ℃, which leads to a decrease in the plasticity of the alloy.

2、 Physical and chemical properties of NS336 (Inconel625, N06625, 2.4610) corrosion resistant alloy:

1. Thermal properties of NS336 (Inconel625, N06625, 2.4610) alloy:

(1) NS336 melting temperature range: 1290 ～ 1350 ℃ [1].

(2) NS336 thermal conductivity: see Figure 2-1.

(3) NS336 specific heat capacity: see Figure 2-2.

(4) NS336 linear expansion coefficient: see Figure 2-3.

2. NS336 Density: ρ= 8.44g/cm3。

3. Magnetic properties of NS336 (Inconel625, N06625, 2.4610) alloy: the alloy is non-magnetic.

4. Chemical properties of NS336 (Inconel625, N06625, 2.4610) alloy:

(1) NS336 oxidation resistance: the alloy has excellent high-temperature oxidation resistance. See Table 2-1 for the weight change of the alloy after cyclic oxidation in air at high temperature.

                                                         Table 2-1

Note: circulating oxidation heating for 15min and cooling for 5min is a cycle.

(2) NS336 corrosion resistance: the alloy has good seawater corrosion resistance, as shown in Table 2-2. The alloy is also resistant to various salt solutions. In addition, it has good corrosion resistance to nitric acid and phosphoric acid, and has considerable resistance to the corrosion of hydrochloric acid and low concentration sulfuric acid heated below the boiling point.

                                                                      Table 2-1

Note: Smooth sample refers to 6.4mm × 100mm × The 300mm flat sample with circular weld shall be annealed at 980 ℃ before welding. The specimen with gap refers to the specimen fixed at the center of the plate surface with 32mm fiber washer by bolts.

3、 Mechanical properties of NS336 (Inconel625, N06625, 2.4610) corrosion resistant alloy:

1. The properties specified in the technical standard of NS336 (Inconel625, N06625, 2.4610) alloy are shown in Table 3-1.

                                                            Table 3-1

① Standard Z9-0105-1990. ② Standard Z9-0104-1990 and GJB 3317-1998.

4、 Structure of NS336 (Inconel625, N06625, 2.4610) corrosion resistant alloy:

1. Transformation temperature of NS336 alloy:

2. Time Temperature Structure Transformation Curve of NS336 Alloy

3. Structure of NS336 alloy: the structure of the alloy in the solution state is austenitic matrix and a small amount of TiN, NbC, and M6C phases. After long-term aging at 650~900 ℃, the precipitated phases are γ "、 δ、 M23C6 and M6C. Main precipitation after long-term aging at 650~700 ℃ γ The strength at room temperature and high temperature of the alloy is obviously improved, and the plasticity is reduced, but still remains at a high level; the main precipitation occurs after aging at 780~850 ℃ δ Although the strength of the alloy is improved, the plasticity of the alloy is decreased. After aging at 900 ℃, there is only a small amount of precipitates, so the mechanical properties are close to the solid solution state. δ The phase is orthorhombic lamellar Ni3Nb, and exists as needle like widmanstatten structure.

5、 Process performance and requirements of NS336 (Inconel625, N06625, 2.4610) corrosion resistant alloy:

1. NS336 alloy formability: The alloy has good cold and hot formability. The ingot forging heating temperature is 1120 ℃, the forging opening temperature is not lower than 1030 ℃, and the forging stopping temperature is not lower than 930 ℃; During die forging, the final deformation shall not be less than 15%~20%. The rolling heating temperature is 1120 ～ 1160 ℃, the rolling starting temperature is not lower than 1050 ℃, the rolling stopping temperature is not lower than 930 ℃, the deformation of semi-finished products of cold rolling sheet is 25% ～ 30%, and the deformation of finished products is not less than 30%. The quenching temperature of intermediate and finished products is 1100 ℃± 10 ℃ [1,8].

2. Welding performance of NS336 alloy: the alloy has good welding performance. It can be used for argon arc welding with tungsten electrode or this alloy as additive in a protective atmosphere, as well as brazing and resistance seam welding.

3. Heat treatment process of NS336 alloy parts: stress relief: 900 ℃; Annealing: 930 ～ 1040 ℃, 1h; Solution treatment: 1090~1200 ℃, air cooling or water cooling. When the alloy is working at no higher than 650 ℃, hot rolled, cold rolled or annealed materials can be used as required. When the working temperature is above 650 ℃, the annealing process can be used for the parts requiring better fatigue performance and tensile strength, and the solution treatment can be used for the parts requiring better creep and durability.

4. NS336 surface treatment process: when removing the oxide skin on the alloy surface, alkali washing is first performed, and then acid washing is performed in nitric acid hydrofluoric acid water solution.

5. NS336 cutting and grinding performance: carbide or high-speed steel tools shall be used. The cutting tool used shall have a positive rake angle. It is recommended to use water-based coolant for high speed cutting and viscous coolant for low speed cutting.