Nickel 200-201

Nickel 200-201

ALLOY 200 | N02200 | 2.4066 | NI 99.2 | NA 11 | НП-2 | NW 2200 | N-100M

ALLOY 201 | N02201 | 2.4068 | LC-NI 99 | NA 12 | НП-2 | NW 2201

Nickel alloys - sometimes referred to as monels, are a category which consists of nickel as their base element with small amounts of copper, iron and manganese as their alloying elements. Nickel alloys mark great resistance to a variety of reducing chemicals and provide exceptional corrosion resistance in aggressive environments.

Nickel 200 is a commercially available (99% Ni) pure alloy with brilliant mechanical properties and resistance to variable environments and Nickel 201 is a modification of the former alloy with lower carbon content.

Nickel alloy maintains a balance in the composition of other alloying elements so as to obtain optimum properties. Both the alloys are solid solution strengthened, and hence the strength of both the pure metals is exceptional. Both the grades have similar chemical composition except for their carbon content.

Hence, grade 201 is used for applications at elevated temperatures since its lower carbon content will restrict embrittlement due to graphitization or carbide precipitation. In the range of 430- 650°C, the use of Nickel 200 is not recommended since it might lose its ductility due to the carbide precipitation. In annealed condition, they have an approximate strength of mild steel, while in rolled condition, they have better strength. Both the grades are ferromagnetic by nature. The specific properties of Nickel 200 include high thermal as well as electrical conductivity, low gaseous constituents, low electrical resistivity and appropriate magnetic properties.

The thermal conductivity of Nickel 200 is 487^2. h.°F (British thermal unit). The torsional strength of the grade in breaking strength of 1” dia rod is 558 MPa, which is quite competent. Hence it could be used in dynamic applications as required. The grade is one of the toughest in respect to impact strength properties due to its nickel content. During Izod test, the alloy can absorb 163J of energy and during Charpy v-notch test it can absorb 271J in impact. As per Charpy tests, Nickel 200 stands as the most durable alloys in regards to impact properties. The grade also has brilliant properties in stress fatigue cycles.

The grade in cold worked condition will endure 10^6 cycles in fresh water with 386MPa maximum stress, in seawater, it will be 372 MPa, and in air, it will be 434MPa. The grade 200 forms a protective passive layer in the presence of oxidizing environment, hence is used in respective applications. The resistance to caustics by the grade is due to the presence of this layer. The Nickel grade 201 has a lower work hardening rate and is suitably used for cold-working operations. Both the grades can be considerably hot formed to almost every shape with proper end temperature. The strength of the grade can be significantly increased with cold-working processes.

  • Chemical properties
  • Physical properties
  • General data
  • Standards Specifications
  • Forms of Supply
  • Corrosion Resistance
  • Heat Treatment
  • Weldability
  • Machining
  • Applications
  • Possible grade alternatives
Grade   Ni C Mn Si CU Cr Fe S

Nickel 200

Min. 99 - - - - - - -
Max. - 0.15 1 0.035 0.25 - 0.40 0.01
Density 8.89 g/cm 3 / 0.321 lb/in 3
Melting Point 1435 – 1446 (°C) / 2615 – 2635 (°F)
Specific Heat @ 70°F 0.109 Btu/lb•°F
Thermal Conductivity @ 70°F 487 Btu•in/ft2•h•°F
Young's Modulus @78°F 29.7 x 106 psi
Electrical resistivity @ 70°F 58 μΩ•m
Annealed 900 – 928 (°C) / 1650 – 1700 (°F)
Quench Rapid Air/Water
Standard Nickel 200 Nickel 201
UNS N02200 N02201
WERKSTOFF NR. 2.4066 2.4068
EN Ni 99.2 LC-Ni 99
BS NA 11 NA 12
JIS NW 2200 NW 2201
AFNOR N-100M -
Pipes & Tubes
Summary Standards
Standard Specification for Nickel Seamless Pipe and Tube ASTM B161
Standard Specification for Electric Fusion Welded Nickel and Nickel Alloy Pipe ASTM B474
Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes ASTM B163
Standard Specification for Welded Nickel (UNS N02200/UNS N02201) and Nickel Copper Alloy (UNS N04400) Pipe ASTM B725
Standard Specification for Welded Nickel (UNS N02200/UNS N02201) and Nickel Copper Alloy (UNS N04400) Tube ASTM B730
Fittings & Flanges
Summary Standards
Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings ASTM B366
Standard Specification for Nickel Alloy Forgings ASTM B564

Piping and tubing, fittings and flanges, washers.

The grade is most useful in reducing environments. It shows considerable corrosion resistance in presence of caustic alkalis, neutral alkalis as well as high oxidizing environments. Nickel 201 can resist temperature range of 320-750°C till extended times without losing its properties.

It is used in laboratory equipment that need to withstand oxidizing temperatures about 1100°C. Both the grades can suitably resist aqueous corrosion. In the presence of caustic soda (NaOH) at 90°C is 0.5 mpy (mils per year) and at 120°C is 1 mpy. In the presence of 10% HCl at 30°C, the corrosion rate is 80 mpy. The grade does not perform well in the presence of nitric acid.

Both the grades can be annealed by carefully selecting the temperature range. It can be done around 700-880°C. The time in temperature should be taken care of along with sectional annealing for maximum strength and mechanical properties. Grade 201 has lower carbon content and lesser hardening rate.

The grade can be welded by conventional techniques such as SAW, SMAW, TIG, etc. The grade 201 has better welding properties due to lesser carbide precipitation at the heat affected zone.

The grade can be suitably machined at commercial rate with common technique. HSS (high speed steel) and cast alloy tools are commonly used. The grade while machining tends to form long stringy chips. Proper speeds and rigid tooling will be required to avoid the same.

Food production, Manufacture and handling of sodium hydroxide, Storage vessels, Valves, Mixers, Viscose Rayon manufacturing, Reactors and vessels, Production of hydrochloric acid and chlorination of hydro-carbons such as benzene, methane and ethane, Shell plate, Tank heads, Heat exchangers, Fluorine generation, Synthetic fibres, Rocket motors, Aerospace and missile components, Drums to transport chemicals, Handling of foods.

Inconel 600
Grade   Ni C Mn Si CU Cr Fe S

Inconol 600

Min. 72 - - - - 14.0 6.0 -
Max. - 0.15 1.00 0.50 0.50 17.0 10.0 0.015

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