cartas de isocorrosión

C U R V A ACIDO SULFURICO PARA ACEROS A U S T E N I T I C O S

Comments on Specific Grades

18-10 (DIN 1.4301, ASTM 304) - limited use in dilute acids 5% maximum at room temperature. Increasing temperature quickly makes the steel useless. Acceptable above about 90% at room temperature.

17-12-2.5 (DIN 1.4401, ASTM 316) - This grade offers a significant advantage over 304 at low concentrations, up to 22% at room temperature only gradually falling with temperature up to 40 deg C and then more quickly to about 5% at 60 deg C.

Austenitic Steels - 254 SMO (DIN 1.4547)

Austenitic Steels - 654 SMO (DIN 1.4562)

Super Austenitic Steels - 904L (DIN 1.4539) - This steel was specifically developed for sulphuric acid use and van be used across the whole concentration range up to 35 deg C.

C U R V A ACIDO SULFURICO PARA ACEROS D U P L E X

Comments on Specific Grades

Super Austenitic Steels - 904L (DIN 1.4539) - This steel was specifically developed for sulphuric acid use and van be used across the whole concentration range up to 35 deg C.

Duplex Steels – SAF 2507 (ASTM A890/995, DIN 1.4469)

Duplex Steels – SAF 2205 (ASTM A789/790/A890, DIN 1.4462)

Duplex Steels – SAF 2304 (DIN 1.4362) is similar to 1.4401 (316) at room temperature but only gradually falls off with temperature, still allowing about 8% at 80 deg C. 1.4462 (2205) is acceptable to as high 40% at room temperature falling to about 12% at 80 deg C. Superduplex 2507 (1.4410) offers only limited improvement to 45% at room temperature.

CURVA ACIDO SULFURICO + 2000ppm DE CLORUROS

Isocorrosion Curves: 0-100% H2SO4, 2000 ppm Chloride IonsCorrosion Rate = 0.1 mm/y (4 mpy)

Comments on Specific Grades

17-12-2.5 (DIN 1.4401, ASTM 316) - This grade offers a significant advantage over 304 at low concentrations, up to 22% at room temperature only gradually falling with temperature up to 40 deg C and then more quickly to about 5% at 60 deg C.

Duplex Steels – SAF 2507 (ASTM A890/995, DIN 1.4469)

Austenitic Steels - 254 SMO (DIN 1.4547)

Austenitic Steels - 654 SMO (DIN 1.4562)

Super Austenitic Steels - 904L (DIN 1.4539) - This steel was specifically developed for sulphuric acid use and van be used across the whole concentration range up to 35 deg C.

CURVA ACIDO SULFURICO + 200ppm DE CLORUROS

Isocorrosion Curves: 0-100% H2SO4, 200 ppm Chloride IonsCorrosion Rate = 0.1 mm/y (4 mpy)

Comments on Specific Grades

17-12-2.5 (DIN 1.4401, ASTM 316) - This grade offers a significant advantage over 304 at low concentrations, up to 22% at room temperature only gradually falling with temperature up to 40 deg C and then more quickly to about 5% at 60 deg C.

Austenitic Steels - 254 SMO (DIN 1.4547)

Super Austenitic Steels - 904L (DIN 1.4539) - This steel was specifically developed for sulphuric acid use and van be used across the whole concentration range up to 35 deg C.