Material selection of petroleum cracking pipe
The material of the petroleum cracking pipe must meet the demanding requirements of the above high temperature, high pressure and corrosive environment. Common petroleum cracking pipe materials include high alloy steel and stainless steel, the specific choice depends on the operating conditions of the cracking unit.
1. Cr-Mo alloy steel
Cr-Mo alloy steel (Chrome-molybdenum alloy steel) is a commonly used material in petroleum cracking pipes, containing chromium and molybdenum elements, which can enhance the corrosion resistance and high temperature strength of steel. Cr-Mo alloy steel has high heat and creep resistance and is suitable for long-term use at high temperatures from 450°C to 600°C.
1Cr5Mo, 1Cr9Mo: These alloy steels contain a high proportion of chromium and molybdenum and are suitable for high temperature cracking reactors, heating furnaces and other equipment that needs to withstand high temperatures and corrosion.
2. Stainless Steel
Stainless steel materials show strong corrosion resistance in high temperature and strong corrosive environment, especially suitable for the condition containing sulfur, chlorine and other corrosive media. Stainless steel cracking pipe is widely used in oil cracking unit and chemical equipment.
304, 316 stainless steel: These common austenitic stainless steel materials have excellent corrosion resistance, especially 316 stainless steel contains molybdenum, which can effectively resist chloride ion corrosion.
3. Superalloy material
When working at extreme temperatures (such as above 750°C), superalloy materials such as nickel-based alloys and cobalt-based alloys are usually selected. These materials have excellent high temperature creep resistance and corrosion resistance for the most demanding cracking units.
Inconel alloy: The nickel-based alloy Inconel is often used in extremely high temperature and corrosive gas environments and has excellent oxidation and corrosion resistance.
