What is ASTM G28?

What is ASTM G28?

The ASTM G28 test methods A and B are utilized in many industries as quality control tests in order to assess the resistance to intergranular corrosion of various stainless steels and nickel-based alloys, such as Alloy 825 and Alloy 625.

Is Alloy 20 Compatibility with sulfuric acid?

Alloy 20 has very good resistance to sulfuric acid. This alloy also shows suitable resistance in phosphoric acid, nitric acid and aqueous salt solutions. Alloy 20 is an excellent option when chloride stress corrosion cracking is an issue, as it resists pitting and crevice corrosion.

What is meant by IGC test?

Intergranular Corrosion (IGC) or Intergranular Attack (IGA), is an efficient test for screening a material’s corrosion resistance under certain conditions.

What alloy has good resistance to corrosion from sulfur compounds?

Resistance to Corrosion Increased chromium in the alloy offers high temperature resistance to sulfur compounds as well as resistance to oxidizing compounds at elevated temperatures or in corrosive media.

What causes intergranular corrosion?

Intergranular corrosion (IGC) is a selective attack in the vicinity of the grain boundaries of a stainless steel. It is as a result of chromium depletion, mainly due to the precipitation of chromium carbides in the grain boundaries.

What is IGC practice E?

Practice E : It is Cu –CuSO4 -16% H2SO4 that detects the susceptibility to precipitation of chromium rich precipitates mainly Cr23C6 carbides. It can detect the effectiveness of solution heat treatment or the supplied condition of the material.

What is another name for Alloy 20?

Alloy 20, also known as Carpenter 20, is a nickel-iron-chromium austenitic alloy that was developed for maximum resistance to acid attack, specifically sulfuric acid.

What P number is Alloy 20?

The P Number of Alloy 20 is 45 according to ASME BPVC Section IX.

What is Igscc?

Intergranular stress corrosion cracking (IGSCC) highly relates to the nucleation of cracks in the heat affected zone(HAZ) or cold-worked zone of austenitic stainless steels, especially in the cases of aged nuclear pressure reactor components[1].

What is ASTM 262 a test?

The ASTM A262 tests can determine if the proper heat treatment was performed or if the alloys are in danger of intergranular corrosion occurring in use. These tests are often run as a qualification test to ensure each batch of stainless steel is properly prepared.

What is the difference between Inconel 600 and 625?

Alloy 625 has a higher chromium content than Alloy 600. The chromium content is the main element of the alloy’s oxidation resistance. Therefore, Inconel 625 has better antioxidant capacity than Inconel 600.

What is Inconel 625 made of?

INCONEL® 625 alloy consists of a solid solution alloy of nickel, chromium and molybdenum alloy with niobium added. When this combines with molybdenum it distorts the alloy’s atomic matrix, thus providing particularly high strength in the annealed condition without a deliberate strengthening heat treatment.