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Stainless steel equipment production process will be the performance of damage, defects and affect the surface of some substances, such as: dust, iron or embedded floating iron, hot temper color and other oxide, rust, burr grinding, welding arc mark, weld spatter, flux, solder defects, oil and grease, residual adhesive and paint, chalk and Marker printing and so on.
 The vast majority are ignored because of their harmful effects without attention or doing a good job. However, they have a protective film on the oxidation potential hazards. Once the protective film is damaged, or otherwise thinned to make changes, the following will begin to corrode stainless steel. Corrosion is generally not over the entire surface, but at or around the defect. This is usually localized corrosion pitting or crevice corrosion, erosion will both depth and breadth of development, but most of the surface from erosion.
304 stainless steel:
0Cr18Ni9, as the most widely used heat-resistant stainless steel, food equipment, general chemical equipment stainless steel mesh, the atomic energy industry, stainless steel mesh is mainly used in filtration areas, chemical, mining sieve.
In the air or chemical corrosion medium can resist a high-alloy steel, stainless steel is a beautiful surface and good corrosion resistance, without going through the plated surface treatment, play inherent in the surface properties of stainless steel, for use in multi-an aspect of the steel, commonly referred to as stainless steel. Representative of the performance of 13 chrome steel, chrome-nickel steel alloy 18-8.
 From the metallographic point of view, because the stainless steel contains chromium chromium film formed on the surface leaving a thin, the membrane separating oxygen from invading the inner steel corrosion effect. In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 12% chromium.
304 is a versatile stainless steel, it is widely used to produce good overall performance requirements (corrosion resistance and formability) of equipment and parts.
304 stainless steel is produced in accordance with the ASTM standard for a grade of stainless steel; 304 equivalent to China's 0Cr19Ni9 (0Cr18Ni9) stainless steel. 304 19% chromium, nickel 9%.
304 is the most widely used stainless steel, heat-resistant steel. For food production equipment, past through chemical equipment, nuclear energy.
| Chemical composition/% |
| Brand |
C |
Si |
Mn |
P |
S |
Ni(nickel) |
Mo |
| 304 |
≤0.08 |
≤1.0 |
≤2.0 |
≤0.05 |
≤0.03 |
18.0~20.0 |
8.25~10.5 |
321 stainless steel:
Alloy 321 (UNS S32100) stainless steel is stable. Its main advantage is having a strong resistance to intergranular corrosion between performance at a temperature of 800-15000F (427-8160C) of carbide precipitates. 321 stainless steel alloy of titanium element to make it resistant to chromium carbide structure more stable.
321 alloy stainless steel due to its excellent mechanical properties at high temperature environment very edge. Compared with the 304 alloy, stainless steel alloy 321 has better ductility and resistance to stress cracking capacity. In addition, 304L can also be used between the role of allergy and corrosion.
Higher carbon content may be 321H, this grade UNS S32109
Standard titanium content of not less than five times the carbon content, and not more than 0.70%.
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