Corrosion Resistance of Nickel-based Alloys

The purchasing pace at the demand end of the international thermal coal market continues to slow down and the international thermal coal price continues to decline. Prices for thermal coal at major international ports continued to fall last week as buyers in Europe slowed in recent days for April, coupled with weaker-than-expected import demand from End users in China. According to China Coal Market net monitoring: as of March 25, Australia Newcastle port thermal coal price index was 253 USD/ton, compared with 309.02 USD/ton as of March 18, down 56.02 USD/ton, down 18.13%. South Africa's Port Richards thermal coal price Index was $264.5 / mt, down the US $62.72 / mt or 19.17% from US $327.22 / mt as of March 18. The European ARA Tri-port thermal coal price Index was $281.8 / ton. Does the price of thermal coal in major international ports continue to decline to affect the price of the Inconel718 powder?

The main alloying elements are copper, chromium, and molybdenum. It has good comprehensive performance and can resist various acid corrosion and stress corrosion. The earliest application (produced in the United States in 1905) is nickel-copper (Ni-Cu) alloy, also known as Monel (Monel alloy Ni 70 Cu30); in addition, there is nickel-chromium (Ni-Cr) alloy (nickel-based heat-resistant alloy) , The heat-resistant corrosion-resistant alloy in the corrosion-resistant alloy), nickel-molybdenum (Ni-Mo) alloy (mainly refers to Hastelloy B series, nickel-chromium-molybdenum (Ni-Cr-Mo) alloy (mainly refers to Hastelloy C series) At the same time, pure nickel is also a typical representative of nickel-based corrosion-resistant alloys. These nickel-based corrosion-resistant alloys are mainly used in the manufacture of various corrosion-resistant environmental components such as petroleum, chemical, and electric power.

Category Nickel-based corrosion resistant alloys mostly have austenitic structure. In the state of solid solution and aging treatment, there are also intermetallic phases and metal carbonitrides on the austenite matrix and grain boundaries of the alloy. Various corrosion-resistant alloys are classified according to their composition and their characteristics are as follows:

The corrosion resistance of Ni-Cu alloy is better than that of nickel in reducing media, and the corrosion resistance of oxidizing media is better than that of copper. It is resistant to high temperature fluorine gas, hydrogen fluoride and hydrogen fluoride in the absence of oxygen and oxidants. The best material for acid (see metal corrosion).

Ni-Cr alloy is also a nickel-based heat-resistant alloy; it is mainly used under oxidizing medium conditions. It is resistant to high temperature oxidation and corrosion by gases containing sulfur and vanadium, and its corrosion resistance increases with the increase of chromium content. This type of alloy also has better resistance to hydroxide (such as NaOH, KOH) corrosion and stress corrosion resistance.

Ni-Mo alloy is mainly used under the conditions of reducing media corrosion. It is the best alloy resistant to hydrochloric acid corrosion, but in the presence of oxygen and oxidants, the corrosion resistance will be significantly reduced.

Ni-Cr-Mo(W) alloy combines the properties of the above-mentioned Ni-Cr alloy and Ni-Mo alloy. It is mainly used under the conditions of oxidation-reduction mixed media. This type of alloy has good corrosion resistance in high-temperature hydrogen fluoride, in hydrochloric acid and hydrofluoric acid solutions containing oxygen and oxidants, and in wet chlorine at room temperature.

Ni-Cr-Mo-Cu alloy has the ability to resist both nitric acid and sulfuric acid corrosion. It also has good corrosion resistance in some oxidation-reduction mixed acids.

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China's non-manufacturing purchasing managers index for March was released by the China Federation of Logistics and Purchasing and the Service Industry Survey Center of the National Bureau of Statistics today. An index of business activity for the non-manufacturing sector as a whole fell below 50 percent in March.

In March, China's non-manufacturing business activity index was 48.4%, down 3.2 percentage points from the previous month. The new orders index was 45.7 percent, down 1.9 percentage points from the previous month, indicating a significant slowdown in the growth of supply and demand in the non-manufacturing sector from the previous month.  In terms of sectors, the business activity index and new order index of transportation, accommodation and catering, culture, sports and entertainment, and tourism-related industries all declined significantly from the previous month.

Then the Inconel718 powder of the market may be affected by significant changes, the price will also be volatile, if you want to know the latest news of the Inconel718 powder, welcome to contact us.

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