UNS N02200 Commercially Pure Or Low Alloy Nickel Good Magnetostrictive Property

Nickel 200, UNS N02200, W.Nr. 2.4060 (Ni99.6), 2.4066(Ni99.2) semi-product for electronic parts

1 PRODUCT

Nickel 200, UNS N02200, W.Nr. 2.4060 (Ni99.6), 2.4066(Ni99.2) semi-product for electronic parts.

Standard product forms include pipe, tube, sheet, strip, plate, round bar, flat bar, forging, forging stock, hexagon, shapes and wire.

2 EQUIVALENT DESIGNATION

UNS N02200, W.Nr. 2.4060 (Ni99.6), W.Nr. 2.4066(Ni99.2)

3 APPLICATION

The corrosion resistance of Nickel 200 makes it particularly useful for maintaining product purity in the handling of foods, synthetic fibers, and caustic alkalies; and also in structural applications where resistance to corrosion is a prime consideration.

Other applications include chemical shipping drums, electrical and electronic parts, aerospace and missile components.

4 OVERVIEW

Nickel

Commercially pure or low-alloy nickel has characteristics that are useful in several fields, notably chemical processing and electronics. Nickel is highly resistant to various reducing chemicals and is unexcelled in resistance to caustic alkalies. Compared with nickel alloys, commercially pure nickel has high electrical and thermal conductivity. It also has a high Curie temperature and good magnetostrictive properties. Annealed nickel has a low hardness and good ductility and malleability. Those attributes, combined with good weldability, make the metal highly fabricable. Nickel has a relatively low work-hardening rate, but it can be cold worked to moderately high strength levels while maintaining ductility.

Nickel 200

Nickel 200 is commercially pure (99.6%) wrought nickel. It has good mechanical properties and excellent resistance to many corrosive environments. Other useful features of the alloy are its magnetic and magnetostrictive properties, high thermal and electrical conductivities, low gas content and low vapor pressure.

Nickel 200 is characterized by:

◘ Excellent resistance in alkaline media,

◘ High ductility in a wide temperature range,

◘ Ferromagnetism,

◘ High electrical and thermal conductivity

5 CHEMICAL COMPOSITION (wt%):

6 METALLOGRAPHY

Nickel 200 is a solid-solution alloy with a face-centered cubic structure. The microstructure typically exhibits a minor amount of nonmetallic inclusions, principally oxides, which are unchanged by annealing.

Prolonged exposure in the temperature range of 800 - 1200°F (425°-650°C) will precipitate graphite. (See Figure 1.) For this reason, the alloy is not recommended for service in the 600°-1200°F (315°-650°C) range. Nickel 201 is used instead.

Figure 1 Solubility of carbon in nickel. Data for the solid portion of the curve were obtained by heating DH 499 (99.9%) nickel in wet hydrogen for 2 hr at 1832°F (1000°C) and then in a mixture of 75% hydrogen, 25% methane for 1 hr at experimental temperature. The triangle and circle symbols represent tests on commercial melts; samples were annealed at 2400°F (1315°C) before testing.

7 PHYSICAL PROPERTIES

Density: 8.9 g/cm³ (0.321 lb/in³)

Melting range: 1435-1446°C (2615-2635°F)

Specific heat: 456 J/kg•°C (0.109 Btu/lb•°F)

Curie temperature: 360°C (680°F)

8 MECHANICAL PROPERTIES

Nominal mechanical properties of Nickel 200 are shown in Table below.

9 CORROSION RESISTANCE

Nickel 200 is highly resistant to many corrosive media. Although most useful in reducing environments, it can be used also under oxidizing conditions that cause the development of a passive oxide film. The outstanding resistance of Nickel 200 to caustics is based on this type of protection.

In all environments, when temperatures above 600°F (315°C) are involved, the preferred material is Nickel 201.

10 WORKING INSTRUCTION

Hot forming

Nickel 200 can be readily hot-formed to practically any shape. Proper temperature during deformation is the most important factor in achieving hot malleability. The recommended temperature range for hot forming is 1200° to 2250°F (650° to 1230°C). All heavy forging should be done above 1600°F (870°C); the metal stiffens rapidly below this temperature. Light forging below 1200°F (650°C), however, will produce higher mechanical properties. Laboratory experiments on forged discs for ring applications have indicated that tensile properties at 1200°F (650°C) can be increased by upsetting the material 50% at 1200°F (650°C). The best temperature range for hot bending is 1600° to 2250°F (870° to 1230°C). In any operation, care should be exercised to avoid heating Nickel 200 above the upper temperature limit of 2250°F (1230°C).

Cold forming

Nickel 200 can be worked by all conventional cold-forming methods. Generally, the alloy will behave similarly to mild steel, except that, because of the higher elastic limit of Nickel 200, greater power will be required to perform the operations. Thus, manual operations such as spinning and hand hammering are limited to simple shapes. Severe work can be done manually only with the assistance of frequent anneals to restore softness.

Cupping and deep-drawing dies are made of gray iron, chilled iron, and alloy castings. Chromium-plated hardened steel, tungsten-carbide or diamond dies are used for wire and rod drawing. All die surfaces should be highly polished.

Tallow, soap, sulfur-based oil, lard oil and similar heavy lubricants are used in connection with cold-working operations.

Cold-rolled sheet and strip may be bent to a greater degree in the direction where the bend axis is perpendicular to the direction of rolling.

In either the annealed or stress-relieved temper, Nickel 200 condenser tubes can be readily expanded into tube sheets for heat exchangers.

The use of soft-temper material generally will yield the most satisfactory results in drawing and severe forming operations. Cold-rolled (not stretcher-leveled) and annealed sheet is in the best condition for spinning and other manual work.

Machining

Nickel 200 can be machined satisfactorily at commercial rates. This material tends to flow under pressure of the tool cutting edge and form long stringy chips. To avoid a built-up edge, tools should be ground with very high positive rake angles; 40°to 45°rake angles have been used in some instances. High-speed-steel or cast-alloy tools should be used. Chip action is substantially better with material in the harder tempers, so that cold-drawn rod in the as-drawn or stress-relieved temper will offer an improvement over annealed material.

11 STANDARD SPECIFICATION

Nickel 200 and 201 are approved for construction of pressure vessels and components under ASME Boiler and Pressure Vessel Code Section VIII, Division 1. Nickel 200 is approved for service up to 600°F (315°C) while Nickel 201 is approved for service up to 1250°F (677°C).

Rod and bar

ASTM B 160 / ASME SB 160

ASTM B 564 / ASME SB 564

DIN 17752

ISO 9723

VdTÜV 345

Wire

DIN 17753

ISO 9724

Pipe and Tube

ASTM B 161 / ASME SB161

ASTM B 163 / ASME SB 163

ASTM B 725/ ASME SB 725

ASTM B 730 / ASME SB 730

ASTM B 751 / ASME SB 751

ASTM B775 / ASME SB 775

ASTM B 829 / ASME SB 829

DIN 17751

ISO 6207

Plate, Sheet & Strip

ASTM B 162 / ASME SB 162

ASTM B 730 Strip

ASME SA 578

DIN 17750

ISO 6208 Strip

VdTÜV 345

EN 10029

SAE AMS 5553

SAE AMS 5555 Strip

Fitting

ASTM B 366 / ASME SB 366

Forging

ASTM B 564 / ASME SB 564

ISO 9725

DIN 17754

Chemical Composition

DIN 17740

12 COMPETITIVE ADVANTAGE:

(1) More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
(2) 6 state key laboratories and calibration center.
(3) Patented technologies.

(4) Ultra-purity smelting process: VIM + IG-ESR + VAR

(5) Excellent high performance.

13 BUSINESS TERM