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  In order to apply to the thermal power plant & incineration facilities throughout the local and overseas, The POSCO newly developed the sulfate & corrosion-resistant steel(So-called ANCOR).
The ANCOR shows an excellent characteristic in terms of corrosion-resistant in sulfate solution when compared with an existing STS type material. Moreover it solves the corrosion problem which may arise from desulfurization facilities in the thermal power plant.

  The localization of welding consumables was demanded according to the development of ANCOR steel.

  Advanced environmentally-friendly steel with sulphuric acid Corrosion Resistance steel

   The new material from POSCO, the specification of their own which has an excellence in high concentration of sulphuric acid dew-point corrosion

   Sulphuric acid & corrosion resistance : 10 times more compared to STS steels, 1.5 times compared to weather proof steels

   Currently applied to 3rd & 4th of Youngheung thermal power plant in domestic
Amount of corrosion according to
sulphuric acid concentration and temperature

   Corrosion characteristics of sulphuric acid resistant : General steel ＜ STS ＜ Weather proof steel ＜ Sulphuric acid & corrosion resistant steel  

   Sulphuric acid corrosion resistant : To strengthen its characteristics, Cu & Co are added.  

   The steel added with Cu : Cu shows 3 times higher of its sulphuric acid resistant characteristics when compared to the steel without Cu.  

   Cu-Co : Co is mixed together with Cu, which exceptionally improves the characteristics of sulphuric acid & corrosion resistance
The speed of corrosion according to
the temperature and sulphuric acid concentration


  ASTM G31-72 : Standard Practice for Laboratory Immersion Corrosion

  Testing of Metals  

  To maintain 50% of sulphuric acid solution at 70℃ for 3-6 hours 

  To measure the amount of corrosion after depositing the testing sample
Equipment for testing the corrosion


Category
Standard (The required mechanical properties)
A condition for evaluation
The assurance for high-temperature steel (Type A)
The assurance for sulphuric acid corrosion resistance (Type B)
Mechanical properties
(butt)
Sulphuric acid & corrosion resistance
After corrosion, WM thickness Thickness of base metal
70℃, 50% To deposit sulphuric acid solution for 6 hrs
T.S in high temp. (Mpa)
400 ( ruptured base metal )
-
T.S in normal temp (Mpa)
550 ( ruptured base metal )
420 ( ruptured base metal )
Temp : 25℃
Impact value (J,FCAW)
60
60
WM, FL, FL+1 (0℃)


    Actual welding: 2 sets (Total welding line 600mm)





FCAW
SC-71ACR


WM
FL
FL+1
FL+3
母材
SC-
71ACR


   Test standard: ASTM G31 (Laboratory Immersion Corrosion Testing of Metals)

  Test condition: Immersion in 50%, 70oC liquid acid during 6hours

  Shape of test material 		 
 
 

 
Decreasing amount of sulphuric acid corrosion (mg/cm2/hr)
SC-71ACR
37
 
 
weld zone corrosion test metal Surface/Lateral
SC-
71ACR

  




Test material
SC-71ACR
Base metal



   Test standard : JIS Z3121 (Methods of tensile test for butt welded joints)

   Test material (Average 2EA): 1A/1
T.S (Mpa) / El. %, Breakage position
SC-71ACR
440 / 30.4%, breakage of base metal

T.S (Mpa) / El. %, Breakage position
FCAW
A
407.9 / 32.8%, Breakage of base metal
B
416.6 / 37.8%, Breakage of base metal
C
412.2 / 33.6%, Breakage of base metal
Solid
D
423.9 / 34.7%, Breakage of base metal



 



   Test standard: JIS Z3128 (Methods of impact test for welded joint)

    Test material (Average 3ea) / Test temperature: sub-size Charpy test material (5mmt) / 0oC

Classification
Monoacid
SC-71ACR
A
B
WM
40.01
49.86
69.05
WM
27.36
50.69
60.4
WM
38.4
46.13
69.05
FL
81.9
60.4
90.95
FL
87.76
78.32
89.58
FL
56.15
71.68
89.12
FL+1
87.31
87.76
81.9
FL+1
91.41
87.76
83.69
FL+1
86.86
91.86
86.41