October 21, 2022
Chinese name 321 stainless steel foreign name stainless steel Japanese brand SUS321 British brand 304S12, 321920 German brand X10CrNiTi189 called austenitic stainless steel characteristics of abrasion resistance, high temperature resistance, creep resistance application Industrial applications for high grain boundary corrosion resistance requirements
321 stainless steel is Ni-Cr-Ti austenitic stainless steel, used in the manufacture of wear-resisting acid containers and equipment lining, conveying pipes.
Austenitic stainless steel equivalent to domestic 0Cr18Ni10Ti
American brand number: 321, S32100, TP321
Japanese brand number: SUS321
British brand number: 304S12, 321920
German brand number: X10CrNiTi189
features
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 metal, so that it has better grain boundary corrosion resistance and high temperature strength. Due to the addition of titanium metal, it effectively controls the formation of chromium carbide.
321 stainless steel faces a better Stress Rupture and Creep Resistance than 304 stainless steel.
application
It is applied to outdoor machines in chemical, coal and petroleum industries with high requirements of grain boundary corrosion resistance, heat-resistant parts of building materials and parts with difficulties in heat treatment, such as:
1. Oil exhaust gas combustion pipeline
2. Engine exhaust pipe
3. Boiler housing, heat exchanger, heating furnace parts
4. Muffler parts for diesel engines
5. Boiler and pressure vessel
6. Chemical transporters
7. Expansion joint
8. Spiral welded pipe for furnace pipe and dryer
Chemical composition
Carbon C: 0.08 or less
Si Si: 1.00 or less
Manganese Mn: 2.00 or less
S: sulfur 0.030 or less
P P: 0.035 or less
Chromium Cr: 17.00 ~ 19.00
Ni: 9.00 ~ 12.00
Ti Ti: p 5 x % C
Mechanical properties of
Tensile strength σb (MPa) : ≥520
Conditional yield strength σ0.2 (MPa) : ≥205
Elongation δ5 (%) : ≥40
Section shrinkage ψ (%) : ≥50
Hardness: 187 hb or less; 90 HRB or less; 200 hv or less
Heat treatment specification and metallographic organization
Heat treatment specifications: 1) solution 920 ~ 1150℃ quick cooling; 2) It can be stabilized according to the requirements of the demander, and the heat treatment temperature is 850 ~ 930℃, but it is indicated in the contract. 3) The solution temperature should not exceed 1066℃, if so, the stabilization treatment should be carried out to prevent the precipitation of chromium.
Metallographic structure: The structure is characterized by Austenitic shape.
● Delivery status: generally in the state of heat treatment delivery, the type of heat treatment in the contract; If not specified, the goods shall be delivered without heat treatment.
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, so that it has better grain boundary corrosion resistance and high temperature strength. Due to the addition of titanium metal, it effectively controls the formation of chromium carbide.
321 stainless steel faces a higher Stress Rupture and higher temperature Creep Resistance than 304 stainless steel.
321 austenitic stainless steel has good corrosion resistance in the atmosphere, which is widely used in petrochemical, electric power, bridge and automobile industries. But the "rust" of stainless steel is not, because of the special service environment, stainless steel will also corrosion. The medium concentration, pH value, temperature and other factors will have a great impact on the corrosion resistance of stainless steel. For example, in the sensitization temperature range of 450~850℃ for a long time, stainless steel will occur intergranular corrosion. The mechanism is that C combines with Cr at the grain boundary to form Cr23C6 and precipitates, which reduces the content of Cr at the grain boundary. This is the so-called "poor chromium". Cr is one of the main elements to inhibit intergranular corrosion. When the content of Cr at grain boundaries is lower than 12%, the probability of intergranular corrosion will increase.
Industry Application:
It IS USED IN THE FIELD MACHINES OF CHEMICAL, COAL AND PETROLEUM INDUSTRIES WITH HIGH GRAIN BOUNDARY CORROSION RESISTANCE, HEAT-resistant PARTS OF BUILDING materials and parts with difficulty in heat treatment
1. Oil exhaust gas combustion pipeline
2. Engine exhaust pipe
3. Boiler housing, heat exchanger, heating furnace parts
4. Muffler parts for diesel engines
5. Boiler and pressure vessel
6. Chemical transporters
7. Expansion joint
8. Spiral welded pipe for furnace pipe and dryer
