321STANLESS STEEL COIL

Introduction：

Stainless steel 321 is a Ni Cr Mo heat-resistant, titanium stable austenitic alloy, which is usually used in the temperature range of 1000 ° to 1600 ° F. 321 stainless steel is mainly used for continuous and intermittent service temperature applications with carbide precipitation range from 800 ° f to 1500 ° F. Type 321 is similar to type 304 stainless steel, but the addition of titanium is at least five times that of carbon. This addition of titanium reduces or prevents carbide precipitation during welding and service conditions from 800 ° to 1500 ° F. In order to provide the best resistance to intergranular corrosion and stress corrosion cracking of polysulfate at service temperatures from 1500 ° to 1650 ° F, air cooling can be used.

Chemical composition:

carbon: 0.08 silicon: 1.00 manganese: 2.00 phosphorus: 0.045 sulfur: 0.030 nickel: 9.00-12.00 chromium: 17.00-19.00 titanium: 5c-0.70

Germany: X10CrNiTi189

Austenitic stainless steel is equivalent to domestic brand 0Cr18Ni10Ti 321 stainless steel is ni-cr-mo austenitic stainless steel, its performance is very similar to 304, but due to the addition of titanium metal, it has better grain boundary corrosion resistance and high temperature strength. Due to the addition of titanium, the formation of chromium carbide is effectively controlled.

321 austenitic stainless steel has good corrosion resistance in the atmosphere and is widely used in petrochemical industry, power industry, bridge and automobile industry [1]. But the stainless steel “rust” is not absolute, because of the special service environment, stainless steel will corrosion. Medium concentration, pH value, temperature and other factors will have a greater impact on the corrosion resistance of stainless steel. For example, in the range of 450~850℃ sensitization temperature long-term use, stainless steel will occur intercrystalline corrosion. The mechanism is that C combines with Cr at the grain boundary to form Cr23C6 and precipitate out, reducing the Cr content at the grain boundary. This is the so-called “poor chromium”. Cr element is one of the main elements inhibiting intercrystalline corrosion. When the Cr content at the grain boundary is less than 12%, the probability of intercrystalline corrosion will increase.

Industry application:

It is used in outdoor machines with high chemical, coal and petroleum industries to resist grain boundary corrosion

1. Petroleum exhaust combustion pipeline

2. Engine exhaust pipe

3.Boiler shell, heat exchanger, heater parts

4. Silencing components for diesel engines

5.Boiler pressure vessel

6. Chemical tanker

7.Expansion joint

8. Spiral welded pipes for furnace pipes and dryers

Our company and China tisco, China Foshan steel, signed a perennial agent relationship. Large inventory, fast delivery, exquisite packaging, perfect products, high quality 321 stainless steel coil, the price has a huge advantage. Looking forward to cooperating with you.