Alloy 400 / N04400

Description

Alloy 400 is a single phase, solid-solution alloy that offers superior resistance to many corrosive environments over a temperature range from sub- zero to 800°F. Alloy 400 has been widely used in many applications but has been particularly useful in marine and chemical processing. Typical applications include valves; pumps and propeller shafts; marine fixtures and fasteners; electrical and electronic components; springs; chemical processing equipment; gasoline and fresh water tanks; crude petroleum stills, process vessels and piping; boiler feedwater heaters and heat exchangers; and deaerating heaters.

Resistance to Corrosion

Alloy 400 exhibits resistance to corrosion by many reducing media. Also, it is one of the few alloys that can be used in contact with fluorine, hydrofluoric acid, hydrogen fluoride or their derivatives. Exceptional resistance has been proven in hydrofluoric acid in all concentrations up to the boiling point. Alloy 400 is also resistant to many forms of sulfuric and hydrochloric acids under reducing conditions. Behavior in seawater is also excellent.

Fabrication and Heat Treatment

Typical shaping, forming, machining and joining operations for Alloy 400 can be used in fabrication. Hot working operations should be performed between 1200°F and 2150°F. For heavy reductions a temperature between 1700°F and 2150°F should be used. Cold working should be performed on annealed material.

Heat treatments available to Alloy 400 are stress equalizing, stress relieving and annealing depending on the mechanical properties desired. Stress equalizing is performed at a temperature of 575°F for a period of 3 hours followed by a rapid quench. This causes an increase in yield strength with no effects on other properties. Stress relieving is achieved at a temperature between 1000°F and 1050°F for a period of 1 to 2 hours followed by slow cooling. This will reduce stresses without producing a recrystallized grain structure and is recommended to obtain minimum distortion after metal removal. Annealing will completely soften work hardened material and is performed by holding at temperatures between 1600°F and 1800°F for 2 to 10 minutes followed by rapid quench.

Specifications

ASTM B164, ASME SB164, N04400, QQN 281D AMENDMENT 2 CLASS A FORM 1, STRESS RELIEVED, EN 10204-3.1, B/SB564 CHEMISTRY ONLY, COLD DRAWN, HOT FINISHED, ASTM B164, ASTM B366, ASME SB366, WPNC-S, ASME B16.11, ASTM B564/ASME SB564, QQN 281D AMENDMENT 2 CLASS A FORM 1, ASTM B127, ASME SB127, QQN 281D AMENDMENT 2 CLASS A FORM 6, COLD ROLLED, HOT ROLLED

Common Trade Names

MONEL® alloy 400

MONEL® is a registered trademark of the Special Metals Corporation group of companies.

Data Sheet

Chemical Composition:

Element Nickel Cobalt Copper Iron Carbon Silicon
Avg. Nominal % Balance 1.0 Max 30 2.5 0.15 Max 0.50 Max

Standard Products

Alloy 400 Plate

Alloy 400 Fittings

Alloy 400 Tube

Alloy 400 Pipe

Alloy 400 Bar

Alloy 400 Sheet

Alloy 400 Fasteners

Alloy 400 Flanges

Alloy 400 Welding Product

Alloy 400 Coil

Alloy 400 Plate Shapes

Alloy 400 Custom Profiles

Alloy 400 Forgings

Alloy 400 Machined Parts

Alloy 400 Welded Components