In600

UNS NO6600, W.Nr.2.4816, alloy600, NA14

Alloy 600 is a nickel-chromium-iron-based solid solution strengthened alloy with good high temperature corrosion and oxidation resistance, excellent cold and hot processing and welding process performance, and has satisfactory thermal strength and high plasticity below 700°C. The alloy can be strengthened by cold working, or it can be connected by resistance welding, fusion welding or brazing.

Corrosion resistance

Alloy 600 has corrosion resistance to various corrosive media. The composition of chromium makes this alloy have better corrosion resistance than nickel 99.2 (alloy 200) and nickel 99.2 (alloy 201, low carbon) under oxidizing conditions. At the same time, the higher nickel content makes the alloy have good corrosion resistance in reducing conditions and alkaline solutions, and can effectively prevent chlorine-iron stress corrosion cracking.

600 alloy has good corrosion resistance in organic acids such as acetic acid, acetic acid, formic acid, and stearic acid, and medium corrosion resistance in inorganic acids. It is excellent in high-purity water used in the primary and secondary cycles of nuclear reactors.

The corrosion resistance.

Especially outstanding performance is its resistance to dry chlorine and chlorine

Corrosion of hydrogen, the application temperature reaches 650℃. At high temperatures, the annealed and solution-treated alloys have good oxidation resistance and high strength in the air.

The alloy can also resist ammonia and nitriding and carburizing atmospheres, but the alloy will be corroded by some oxidizing media when the redox conditions alternate.

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Physical properties

Melting point: 1370-1425 ℃

Density: 8.4 g/cm3

Magnetic: none

Executive standard

Forgings ASTM B564

Bar ASTM B166 AMS 5665/5667

Strip/plate ASTM B168 ASTM B906 AMS5540

Seamless pipe ASTM B167/ B163 A/B516/517 ASTM B751/B775/B829

Accessories: ASTM B366

Processing

Thermal processing

1. The hot working temperature range is 1200℃~900℃, and the cooling method is water quenching or rapid air cooling.

2. To obtain the best corrosion resistance and the most suitable crystal structure, heat treatment is required after thermal processing.

3. The material can be directly fed into the heated furnace.

Cold working

1. The cold-worked material should be annealed or solution heat-treated. The work hardening rate of 600 alloy is close to that of austenitic stainless steel, so similar processing equipment can be selected.

2. Intermediate annealing should be carried out during the cold working process.

3. When the amount of cold working is greater than 5%, the workpiece needs to be solution treated.

4. In order to reduce the wear of the material, the mold should choose alloy tool steel, hard alloy or cast steel.

Welding process

The alloy has good welding performance and can be connected by various methods such as arc welding, argon arc welding, resistance welding and brazing. Large or complex welded structural parts should be annealed at 870°C for 1h after fusion welding to eliminate welding stress.

Parts heat treatment process

The heat treatment process of the parts should be carried out according to the heat treatment system of the corresponding material standard. The annealing treatment of sheet and strip parts should be carried out in a protective atmosphere.

 

 

Application field

 

1. Aero Engine Parts

 

2. Thermowell in corrosive atmosphere

 

3. The production and use of corrosive alkali metals, especially the environment where sulfides are used

 

4. Catalytic regenerator in petrochemical production

 

5. Nuclear reactor