2.4642

2.4642 is a high chromium-nickel alloy with excellent properties, resistant to a variety of corrosive aqueous media and high performance temperature atmosphere. In addition to corrosion resistance, Alloy 690 has high strength, good metallurgical stability, and good manufacturability.

2.4642Chemical composition：

	Ni	Cr	Fe	C	Mn	Au	Si	S	Cu	P
Min	58.0	27.0	7.0	―	―		―	―
Max		31.0	11.0	0.05	0.50	0.50	0.50	0.015	0.50	0.03

2.4642Physical properties：

DensityMg/m3	Melting point°C	Specific heatJ/kg	ResistivityµΩ-m	Poisson’s ratio
8.19	1343-1377	450	1.148	0.289

2.4642Mechanical properties：

Products	Size / mm	Mechanical properties
		σpo.2/MPa	σb/MPa	δ₅/%
	φ12.7×1.27	461	758	39
Pipes (cold drawn)	φ19.0×1.65 p88.9×5.49	379 282	700 648	46 52
Flat steel (hot-rolled)	φ13×51	352	703	46
Bar (hot-rolled)	51 16	334 372	690 738	50 44
Strip (cold rolled)	thickness3.81	348	724	41

2.4642Alloy properties：

Corrosion resistance: CNEL 690 has good corrosion resistance in a wide range of water environments and high temperature environments. Due to its high chromium content, the alloy is particularly resistant to oxidation conditions. Alloy 690 is also very resistant to sulfur attacks at high temperatures.

Oxidation resistance: HuaNickel 2.4642 has good oxidation resistance and sulfidation in high-temperature gas environments. Alloy 690 has good oxidation resistance to many oxidizing acids, and it is good for treating nitric oxide and nitric/hydrofluoric acid.

Stability: Alloy 690 has a high degree of metallurgical stability and does not form embryonic phases under long-term exposure to high temperatures.

High Temperature Resistance: HuaNickel 2.4642 is widely used in critical parts of nuclear reactors such as evaporators and fuel element sheathing due to its excellent high temperature resistance.

2.4642Uses of alloys：

HuaNickel 2.4642 alloy is known for its excellent corrosion resistance and high temperature strength. 2.4642 is widely used in the chemical, petroleum, coal chemical, nuclear and refining industries, especially in the manufacture of high-temperature reactors and heating equipment.

2.4642Process performance：

Welding process: 2.4642 has excellent weldability.

Fabrication: High Nickel Alloy 690 is easily manufactured using conventional techniques for high nickel alloys. In most working operations, Alloy 690 exhibits similar properties to Stone-Iron Alloy 600.

Heat treatment: Alloy 690 should be clean before heating and should be heated in a low sulfur atmosphere. The open-heating furnace atmosphere should also be slightly reduced to prevent excessive oxidation of the material. HuaNickel 2.4642 is a solid solution alloy that cannot be hardened by heat treatment. The alloy is usually used in annealed conditions.

Relevant standards：

Rods, rods, wires, and forgings- ASTM B / ASME SB 166、ASTM B 564 /ASME SB 564、ASME N-525、ISO 9723、MIL-DTL-24801

Suture tubes and tubes- ASTM B / ASME SB 163、ASTM B 167 / ASME SB 829、ASTM B 829 /ASME SB 829、ASMENormative Case2083、N-20、N-525、ISO 6207、MIL-DTL-24803

Plates, plates, and strips- ASTM B / ASME SB 168 / 906、ASME N-525、ISO 6208、MIL-DTL-24802

Welding products52 – AWS A5.14 / ERNiCrFe-7；152 – AWS A5.11 / ENiCrFe-7