Feature 321 stainless steel in which Ti as a stabilizing element exists, but it is also heat resistant steel at high temperatures is much better than the .321 316L stainless steel in different concentration and temperature of the organic and inorganic acids, especially in the oxidation MEDIUM has good abrasion performance, for the manufacture of wear-resistant acid containers and the lining wear equipment, pipelines. 321 stainless steel is Ni-Cr-Ti-type austenitic stainless steel, its performance is very similar to the 304, but due to the addition of titanium, it has a better intergranular corrosion resistance and high temperature strength. The addition of titanium, making it effective control of the formation of chromium carbides. Excellent high-temperature stress 321 stainless steel with a breaking (Stress Rupture) properties and high temperature creep resistance (Creep Resistance) stress mechanical properties are superior to 304 stainless steel. Applications Used open field machinery, grain boundary corrosion resistance for high chemical, coal, oil industry, building materials, heat-resistant parts and heat treatment difficult parts, such as: 1. petroleum gas combustion engine exhaust pipes 2 3 boiler ..... case, the heat exchanger, furnace parts 4 diesel engine muffler boiler and pressure vessel components 5 6 7 Chemicals truck pipeline expansion joints 8 burners and dryers spiral welded pipe chemical composition of carbon C: ≤0.08 silicon Si: ≤1.00 Mn Mn: ≤2.00 sulfur S: ≤0.030 phosphorus P: ≤0.035 chromium Cr: 17.00 ~ 19.00 Ni-Ni: 9.00 ~ 12.00 Titanium Ti: ≥5 × C% Mechanical properties Tensile strength σb (MPa): ≥ 520 Conditions yield strength σ0.2 (MPa): ≥205 Elongation δ5 (%): ≥40 section shrinkage ψ (%): ≥50 Hardness: ≤187HB; ≤90HRB; ≤200HV Heat treatment and microstructure Heat Treatment Specifications: 1) 920 ~ 1150 ℃ solution fast cold; 2) According to the demand side, demand may be stabilizing treatment, heat treatment temperature is 850 ~ 930 ℃, but it must be specified in the contract. 3) The solution temperature should not exceed 1066 ℃, more than words, the processing must be stabilized to prevent precipitation of chromium. Microstructure: Organizing for the austenitic type. ● Delivery status: generally heat treatment delivery, the treatment types specified in the contract; not indicated, by not heat treatment delivery.