NACE MR0103 CS Pipe Manufacturer

Tubos India is one of the large manufacturers for high quality NACE MR0103 Materials. NACE International has developed significant standard relative to the use of materials in hydrogen sulfide which is MR0103 material Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining Environments. In NACE MR0103 carbon steel pipes Hydrogen sulfide is not only a poisonous gas, but also can cause stress corrosion cracking in alloys and steels. In some case of stress corrosion cracking (i.e. SSC), hydrogen sulfide near the surface of the steel breaks down during the corrosion reaction into atomic hydrogen(H) and iron sulphides(i.e. FeS).

This little hydrogen atom is so small that it can easily direct into the iron crystals in the steel. When another hydrogen atom comes along with it, they prefer to hang out together and they form hydrogen gas(H2). With enough exposure to hydrogen sulfide and more hydrogen atoms enters in steel, the hydrogen gas pressure increases in the voids in the steel until the it cracks from the inside out (this is called HIC) or the stress on the steel combines with the stress from inside the steel to cause SSC.