Ni200 High Quality Nickel Sheet

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Product Description

Product Attributes

Brand: PSX

Place Of Origin: China

Species: Nickel Plate

Whether Powder: Not Powder

Execution Standard:: GB/T2054-2005, ASTM

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Nickel Plate in process

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Product Description

What is Ni200 High Quality Nickel Sheet？

Industrial pure Nickel Material is an important rare metal, which not only plays an indispensable role as an alloying element in most alloys, but also serves as an important engineering structural material with a wide range of applications in the fields of chemical industry, pharmaceuticals, nuclear energy and ships, etc. In particular, pure nickel (Ni≥99%) has been a key material in caustic soda projects due to its excellent alkali corrosion resistance. Especially pure nickel (Ni ≥ 99%) materials, because of its excellent resistance to alkali corrosion characteristics, in the caustic soda project has been an essential key material.

Ni200 pure nickel pipe chemical composition and physical properties of nickel is a slightly yellowish silver-white spreading metal, atomic number 28. Pure Nickel Plate is a single-phase austenitic organization, the crystal structure of the face-centered cubic lattice, the liquid solidification process does not occur in the phase transition. The chemical composition of Ni200 pure nickel is shown in Table I:

Grades	Ni	Cu	Fe	Mn	C	Si	S
N02200	>99.0%	<0.25%	≤0.40%	≤0.35%	≤0.15%	<0.35	≤0.01%

Ni200, Ni200 High Quality Nickel Sheet also known as UNS N02200, is a pure nickel alloy with excellent corrosion resistance and good mechanical properties. It is a low carbon, low phosphorus and low sulfur alloy with excellent machinability and weldability. Ni200 is widely used in the manufacture of equipment and components in the chemical, petroleum, food and pharmaceutical industries, etc. The density of pure nickel Ni200 is about 8.9g/cm 3 , Mohs hardness 5.0-6.0, yield strength 105MPa. The main physical properties of pure nickel and mild steel, austenitic stainless steel comparison is shown in Table II:

Materials	Intensity（g/cm³）	Yielding strength（Mpa）	Melting Points（℃）	Coefficient of thermal expansion（10^-6/℃ )	Thermal conductivity (W/m.k)	Resistivity（m.Ω·cm）
Ni200	8.9	105	1455	4.1	91.96	6.8
A106	7.85	240	1500	11.4	46.89	15
S304	7.93	170	1400	17.3	16.29	72

As can be seen from the above table, the density of pure nickel is greater than mild steel and stainless steel, but the yield strength is lower, the thermal conductivity is much greater than mild steel and stainless steel. Therefore, pure nickel and mild steel and stainless steel compared to the material is relatively soft, liquid viscosity is relatively large, poor fluidity, fast solidification. It is worth noting that the surface of nickel at room temperature will generate a dense layer of oxide film, its main component is nickel oxide (NiO), its melting point is up to 1984 ℃, more than the melting point of pure nickel nearly 500 ℃, and insoluble in alkali, nickel-based pipe alkali corrosion resistance that is derived from the protection of this layer of oxide film. Ni200 pure nickel material weldability analysis of nickel by the above chemical composition and physical properties of nickel analysis shows that pure nickel, the melting point of nickel is higher than stainless steel, but lower than that of pure nickel. From the above analysis of the chemical composition and physical properties of nickel, it can be seen that the melting point of pure nickel is higher than stainless steel, but lower than mild steel, nickel can therefore be welded by fusion welding welding technology. Nickel and hydrogen, oxygen, nitrogen and other gaseous elements at room temperature, the nature of pure nickel is relatively stable, but with the increase in temperature, its ability to absorb hydrogen, oxygen, nitrogen rose significantly. Pure nickel begins to oxidize slightly in air at a high temperature of 500℃, and oxidizes violently when the temperature reaches 750℃. Oxygen, hydrogen and other gaseous elements in the liquid nickel solubility, especially in the arc welding atmosphere, the molten metal superheat, in the molten pool surface through the localized active parts and droplet absorption of gases, the arc atmosphere there are excited molecules, atoms and ions, which increases the activity of the gas, so that its solubility in the metal increases, so the arc welding of the molten metal absorbed by the amount of gas often exceeds the equilibrium content of it! (solubility). But the solubility of the gas with the decrease in temperature and significantly reduce, for example, oxygen at 1720 ℃ when the solubility of 1.18%, but in the 1470 ℃ when the solubility of the drastic reduction to 0.06%. Hydrogen in the liquid-solid phase transition when the solubility can quickly drop by two-thirds. As a result of pure nickel welding, the pool metal viscosity is relatively large, poor mobility, coupled with nickel's thermal conductivity, liquid-solid phase transition temperature range is small, the melt pool crystallization and solidification speed, high temperature dissolved in liquid nickel in the hydrogen can not escape in time, easy to remain in the molten pool in the formation of hydrogen gas holes.

In addition, melting and molten pool of oxygen in the precipitation process will also react with nickel to produce nickel oxide NiO, it and the oxide film in the nickel oxide together and can be reduced by hydrogen to generate water vapor H 2 0, in the solidification process to escape in time to cause water vapor pores. Nitrogen itself is neither dissolved in nickel, nor react with nickel, therefore, theoretically can be used as a protection of nitrogen to weld nickel. However, nitrogen forms NO and other nitrides in the oxidizing arc atmosphere, which is the main factor causing the weld hardness to rise and plasticity to fall. Sulfur, phosphorus and other impurity elements on pure nickel weld Sulfur, phosphorus and other impurity elements at high temperatures is very easy to generate low-melting co-crystals with nickel, such as nickel sulfide melting point of 645 ° C, nickel phosphide melting point of 880 ° C, and pure nickel melting point of 1455 ° C. Therefore, when pure nickel molten pool solidified, these low-melting co-crystals are still in the also in the liquid state, in the form of liquid film residue in the grain boundaries of the area, the weld in the process of cooling the contraction stress, easy to open up the weld. Under the action of shrinkage stress, easy to crack and form hot cracks. Therefore, it is necessary to control the base material and filler metal in the impurity elements such as sulfur, phosphorus content, the general standard sulfur content shall not exceed 0.01%. Bevel preparation and process parameters of pure nickel welding pure nickel material due to high thermal conductivity, welding state of the molten pool of liquid metal viscosity, mobility and wettability is poor, so it has the characteristics of low permeability, it is not appropriate to increase the line energy to increase the permeability. Generally used to increase the bevel angle, reduce the thickness of obtuse edge, and through the appropriate swing and other wire transportation techniques to improve the liquid metal fluidity, to increase the effect of penetration. General thin-walled pipe V-shaped bevel, bevel angle to reach 75-80. blunt edge height 0-1mm, bevel clearance 2-3mm. welding process.

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