The difference between stainless steel 321 and 304
321 stainless steel of Ti as a stabilizing element exists, but it is also a hot steel, in terms of high temperature is better than 316 l. 321 stainless steel in different concentration and temperature of organic acid and inorganic acid, especially in oxidizing medium has good abrasion resistance, used in the manufacture of the lining of wear resistant acid containers and equipment and pipelines.
321 stainless steel is ni-cr-ti austenitic stainless steel, its performance is very similar to 304, but due to the addition of titanium, it has better grain boundary corrosion resistance and high temperature strength. The formation of chromium carbide is effectively controlled by adding titanium.
The Stress Rupture and Creep Resistance of 321 stainless steel are both excellent than that of 304 stainless steel. Suitable for high temperature welding components.
Equivalent to domestic 0Cr18Ni10Ti
American brands: 321, S32100, TP321
Application
321 stainless steel is ni-cr-ti austenitic stainless steel, with abrasion resistance, high temperature resistance, creep resistance, etc., for the manufacture of wear-resisting acid container and wear-resisting equipment lining, conveying pipeline.
Used in chemical, coal and petroleum industries with high requirement of grain boundary corrosion resistance, outdoor machines, heat-resistant parts of building materials and parts with difficulty in heat treatment, such as:
1. Oil exhaust combustion pipeline
2. Engine exhaust pipe
3. Boiler shell, heat exchanger, heating furnace parts
4. Muffler for diesel engine
5. Boiler and pressure vessel
6. Chemical truck
7. Expansion joint
8. Spiral welded pipe for furnace pipe and dryer
9. Aircraft
304 stainless steel is a common stainless steel material, density of 7.93 g/cm3, also known as 18/8 stainless steel industry. Resistance to high temperature of 800 ℃, has the processing performance is good, the characteristics of high toughness, widely used in medical industry and furniture decoration industry and food industry.
The common labeling methods in the market include 06Cr19Ni10 and SUS304, among which 06Cr19Ni10 generally refers to national standard production, 304 generally refers to ASTM standard production, and SUS304 refers to daily standard production.
304 is a universal stainless steel widely used in the manufacture of equipment and parts requiring good overall performance (corrosion resistance and formability). To maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and more than 8% nickel. 304 stainless steel is a brand of stainless steel manufactured according to ASTM standard.
Range of application
304 stainless steel is the most widely used chrome-nickel stainless steel [1], as a steel with a wide range of USES, has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; Punching, bending, such as hot workability is good, no heat treatment hardening phenomenon (using the temperature to 196 ℃ ~ 800 ℃). Corrosion resistance in the atmosphere. If it is industrial atmosphere or heavily polluted area, it should be cleaned in time to avoid corrosion. Suitable for food processing, storage and transportation. Good machinability and weldability. Plate heat exchanger, corrugated pipe, household articles (1, 2 class tableware, cabinet, indoor pipeline, water heater, boiler, bathtub), auto parts (windshield wiper, muffler, mold products), medical appliances, building materials, chemistry, food industry, agriculture, ship parts, etc. 304 stainless steel is nationally approved food grade stainless steel.
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