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Alloy 200 Stainless Steel

Penn Stainless inventory now includes Alloy 200 (UNS N02200) in sheet, sheet coil, plate, round bar, processed flat bar and tubular products.

Overview

General Properties

Nickel grade 200 is 99.6% pure nickel, one of the toughest metals. Nickel 200′s characteristics include excellent mechanical properties, a low gas content, low vapor- pressure, magnetic properties, high thermal and electrical conductivity. These properties and its chemical composition make Nickel 200 fabricatable and highly resistant to corrosive environment. Nickel 200 is useful in any environment below 600º F. It is highly resistant to corrosion by neutral and alkaline salt solutions. Nickel 200 also has low corrosion rates in neutral and distilled water. The metal can be hot formed to any shape and formed cold by all methods.

Applications:

  • Food processing equipment
  • Marine and offshore engineering
  • Salt production
  • Caustic handling equipment
  • Manufacture and handling of sodium hydroxide, particularly at temperatures above 300° F
  • Reactors and vessels in which fluorine is generated and reacted with hydrocarbons

Specifications

UNS: ASTM/ASTE N02200

Resistance

Corrosion resistance

  • excellent resistance to many corrosive media from acid to alkaline.
  • most useful under reducing conditions but, where a passive oxide is formed, it can also be used in oxidizing conditions.
  • most significant property is extremely high resistance to caustic alkalies up to and including the molten state.
  • presence of chlorates must be kept to a minimum, as they accelerate the rate of attack.
  • resistance of Alloy 200 to mineral acids varies according to temperature and concentration and whether or not the solution is aerated.
  • corrosion resistance is better in deaerated acid.
  • In acid, alkaline and neutral salt solutions, this alloy shows good resistance, but severe attack occurs in oxidizing salt solutions.
  • resistant to all dry gases at room temperature.
  •  low-carbon alloy can be used in dry chlorine and hydrogen chloride at temperatures up to 550 ‹C (1020 ‹F).
Processing

Hot Working

  • Hot working temperatures should be between 1200° F and 2250° F with heavy forming to be performed at temperatures above 1600° F.
  • Annealing should be performed at a temperature between 1300° F and 1600° F.
  • Care should be taken when choosing the anneal temperature and time at temperature for this can greatly influence the mechanical properties and structure of the material.

Weldability

  • Nickel 200 can be easily welded by conventional welding, brazing, and soldering processes with the exception of the oxyacetylene process.
Properties

Chemical Composition

Ni Fe C Mn Si Cu Mg Ti S
200 >99.0 <0.40 <0.15 <0.35 <0.1 <0.25 <0.01

Mechanical Properties

Product Form Condition Tensile (ksi) .2% Yield (ksi) Elongation (%) Hardness (HRB)
Rod & Bar Hot Finished 60-85 15-45 55-35 45-80
Rod & Bar Cold Drawn/Annealed or Hot-Finished/Annealed 55-75 15-30 55-40 45-70
Plate Hot-Rolled/Annealed 55-80 15-40 60-40 45-75
Sheet Annealed 55-75 15-30 55-40 70 max
Tube & Pipe Seamless Annealed 55-75 12-30 60-40 70 max

Physical Properties

Alloy Density lb/cu in Modulus of Elasticity (x10^6psi) Mean Coefficient of Thermal Expansion ((IN./IN./°F x 10^-6) Thermal Conductivity (BTU-in/ ft2-h-°F)
200 0.321 30.0 7.4 533