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SUS321 alloy stainless steel Pitting corrosion

Posted:2016/9/27 4:57:22

SUS321 alloy stainless steel Pitting corrosion

 

SUS321 alloy stainless steel because of its excellent mechanical properties, work in high temperature environment is very advantageous. Compared with the 304 alloy, SUS321 alloy stainless steel has better ductility and resistance to stress fracture. In addition, 304L can also be used for anti-sensitization and intergranular corrosion.

 

SUS321 Physical Properties:

Grade

Density (kg/m3)

Elastic Modulus (GPa)

Mean Coefficient of Thermal Expansion (mm/m/°C)

Thermal Conductivity (W/m.K)

Specific Heat 0-100°C (J/kg.K)

Electrical Resistivity (nW.m)

0-100°C

0-315°C

0-538°C

at 100°C

at 500°C

321

8027

193

16.6

17.2

18.6

16.1

22.2

500

720

 

SUS321 Chemical composition;

C

Si

Mn

P

S

Ni

Cr

others

≤0.08

≤1.00

≤2.00

≤0.045

≤0.030

9.00-12.00

17.00-19.00

Ti 5C-0.70

 

SUS321 Pitting corrosion:
The stable pits 321 and 347 are comparable in corrosion resistance to pitting and galvanic corrosion in alloys containing chloride ions, as well as alloy 304 or 304L stainless steels because of their similar chromium contents. In general, for unstable and stable alloys, the chloride content in the water environment is limited to 100 parts per million, especially in the presence of interstitial corrosion. Higher chloride ion content leads to gap corrosion and pitting corrosion. Molybdenum-containing alloys, such as Alloy 316, are to be considered for use in harsh conditions where the chloride content is higher, the pH is lower and / or the temperature is higher. Stable Alloys 321 and 347 passed the 5-hour salt spray test (ASTM B117) for 100 hours, and the samples tested did not produce rust and did not fade. However, if these alloys are exposed to salt fog from the sea, there may be pitting, gap corrosion and severe discoloration. Alloys 321 and 347 are not recommended to be exposed to the marine environment.

 

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