3 10moln is a special austenitic urea grade stainless steel. The urea grade stainless steels specially used for urea production mainly include 3 16ug, 00Cr25Ni22Mo2n (2E69), S3 1050, 3 10Moln, 725LN, X 1CrNiMon25. Urea production is synthesized from carbon dioxide and ammonia at high pressure (140~250 atmospheres) and temperature of 180~2 10 degrees. Ammonium carbamate, an intermediate product, has strong corrosiveness to stainless steel, which can't reach the corrosion resistance of ordinary stainless steel such as 3 16L. The special steel clock developed from this is called urea grade stainless steel.

Chemical composition:

C≤ 0.03

Cr 24.0 26.0

Nickel 20.5 23.5

Mo 1.6 2.0

Iron residue

N 0.09 0. 16 ..

Mn≤ 2.0

Si≤ 0.4

P≤ 0.020

S≤ 0.0 15

Physical properties:

Density: 7.9 g/cm3

Elastic modulus: 158- 195 GPa

Thermal conductivity: 13 W/(m? ℃)

Hardness: HRB ≤95

Thermal expansion coefficient (20-100℃):15.5×10-6/℃

Approximate operating temperature: -200 to +300℃

Main features: strong corrosiveness and good weldability of high temperature and high pressure urea ammonium carbamate solution.

Uses: Mainly used in chemical, petroleum and urea equipment.