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How to reduce the risk of intergranular corrosion and test it

times   2016-11-03

The intergranular corrosion(intergranular attack) usually progresses along a narrow path along the grain boundary and,in a severe case of grain-boundary corrosion,entire grains may be dislodged due to complete deterioration of their boundaries.In any case the mechanical properties of the structure will be seriously affected.(What is intergranular corrosion in metal material?)

Stainless Steel Pipeline Cracked By Intergranular Corrosion
Stainless Steel Pipeline Cracked By Intergranular Corrosion

Materials with less than 0.05% carbon normally have sufficient resistance against intergranular corrosion after welding.ELC (extra low carbon content) steels,for example,steels with maximum 0.030% carbon,have very good resistance to intergranular corrosion.The same applies to steels stabilized with titanium (Ti) or niobium (Nb),since these types of steel form niobium or titanium carbides instead of chromium carbides,thus avoiding the critical decrease in the chromium content.

Chemical Composition Inspection For Stainless Steel Fittings
Chemical Composition Inspection For Stainless Steel Fittings

Intergranular corrosion testing is the only corrosion test performed as a standardized pre-delivery test.It is carried out as a rule on samples from finished tubes in the as-delivered condition or on material that has been sensitized,for example,heated in the critical temperature range in a furnace or by welding.

In haihao flanges and pipe fittings(butt weld pipe fittings and forged pipe fittings) factory,when we manufacture the stainless steel products,we will arrange the intergranular corrosion testing accordingly to avoid quality problem.We can produce the flanges and pipe fittings in international standards such as API,ANSI,ASME,BS,DIN,EN,JIS,GOST,MSS,UNI etc,and also stocks a wide range of flanges and pipe fittings in various materials,sizes and specifications.(pipe fittings materials data)

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