Sulfide Stress Cracking Testing

       The testing of metals subjected to applied stresses for resistance to cracking failure in low-pH aqueous environments containing H2S in compliance with sour service materials qualification NACE MR0175/ISO 15156.

Standard of Test

NACE TM0177

• Method A –Tensile Test
• Method B – Bent-Beam Test (3 point)
• Method C – C-Ring Test

NACE TM0316

• Four Point Bend Test

EFC 16

• Carbon and low alloy steel test methods

EFC 17

• CRA test methods 

Hydrogen Induced Cracking (HIC)

      Standard set of test conditions for consistent evaluation of pipeline and pressure vessel steels and compares test results from different laboratories pertaining to the results of the absorption of hydrogen generated by corrosion of steel in wet H2S.

     HIC testing in accordance with NACE TM0284 by exposing unstressed test specimens to the specified environment saturated with hydrogen sulfide gas at 1 bar pressure for a duration of 96 hours for test solution A, B and 90 days maximum for test solution C, dependent on the partial pressure H2S in the test gas.

     Method Evaluation of Hydrogen Induced Cracking

1. The specimens are metallographically prepared, and any cracks are measured and the following ratios reported: 

• CSR (Crack Sensitivity Ratio)
• CLR (Crack Length Ratio)
• CTR (Crack Thickness Ratio) 

    The crack area ratio (CAR) shall be determined for each specimen and calculated as follows:

Stress corrosion cracking (SCC)

         Stress corrosion cracking (SCC) is mainly damage caused that detected many in industry. The stress corrosion test will be performed in according to the standard for study or applied in quality test to evaluate the material (material selection) that can have resistance to SCC.

Standard of Test

• ASTM G1 Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
• ASTM G30 Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens
• ASTM G31Standard Guide for Laboratory Immersion Corrosion Testing of Metals
• ASTM G31 Standard Practice for Laboratory Immersion Corrosion Testing of Metals
• ASTM G36 Standard Practice for Evaluating Stress-Corrosion-Cracking Resistance of Metals and Alloys in a Boiling Magnesium Chloride Solution
• ASTM G38 Standard Practice for Making and Using C-Ring Stress-Corrosion Test Specimens
• ASTM G39 Standard Practice for Preparation and Use of Bent-Beam Stress-Corrosion Test Specimens

Intergranular corrosion test

        Intergranular (Strauss) tests is simulation of corrosive attacks on high alloy steel to determine the fitness to purpose

Standard of Test

• ASTM A262 Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
• Practice A: Oxalic acid etch test (rapid screening test) use for Classification of etch structures of austenitic stainless steels.
• Practice B: Ferric sulfate – Sulfuric acid test use for detecting susceptibility to intergranular attack in austenitic stainless steels
• Practice C: Nitric acid test use for detecting susceptibility to intergranular attack in austenitic stainless steels
• Practice E: Copper – Copper Sulfate – 16% Sulfuric acid test use for detecting susceptibility to intergranular attack in austenitic stainless steels
• Practice F: Copper – Copper Sulfate – 50% Sulfuric acid test use for determining susceptibility to intergranular attack in austenitic stainless steels
  

Test Range: Pressure: Atmospheric pressure (1bar),Temperature: 90 ⁰C Max. 

   Pitting Corrosion Test

           To evaluate the likelihood of a metal developing localized corrosion in the form of holes on its surface. (Macrostructure Photos and Show the detail)

Standard of Test

     ASTM G48 Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution Method A

Salt Spray Test

         Corrosion test under salt spray fog. This method is using to test the corrosion resistance on coating surface or surface treatment in metal.

Machine capacity

Size of Chamber:   W 1500 mm x H 1000 mm x D 70 mm

Standard of Test

     ASTM B117 Standard Practice for Operating Salt Spray (Fog) Apparatus.