Tenaris has developed OCTG Grades with high resistance to Sulfide Stress Corrosion Cracking – SSCC-. Being available in yield strength ranging from 80.000 to 110.000 psi, these products are designed to provide outstanding performance in severe sour conditions.

Although hydrogen sulfide is non-corrosive in the absence of water, if moisture is present, the gas and the oil will become corrosive.

The occurrence of cracking takes place when the combination of tensile stress, material susceptibility and hydrogen content become excessive.

Sulfide stress cracking is basically a hydrogen embrittlement phenomenon. The hydrogen ions - formed in a cathodic reaction - are small enough to enter the metal, which causes the steel embrittlement. Under stresses this embrittled metal readily cracks.

Tenaris has developed carbon low alloy steels that are obtained through state-of-the-art manufacturing processes that provide the steels with physical, chemical and metallurgical characteristics that ensure their outstanding resistance to the hydrogen sulfide cracking.

The main characteristics of the Tenaris Sour Service products are listed below:

Hardness distribution for 7"x12, 65mm - TN 110SS Grade	-	Clean steel.
	-	Deep desulfurization.
	-	Low residual-elements content.
	-	Tight chemical composition range.
	-	Low residual stress.
	-	No cold-worked spots.
	-	Excellent Hardenability.
	-	High Tempering temperature.
	-	Fully Tempered Martensitic structure.
	-	Through-wall micro structural homogeneity.
	-	Fine grain structure.
	-	High-impact toughness.

Corrosion laboratories has the facilites to perform:

	- NACE Methods A (Tensile test, both proof ring and dead weight).
	- NACE Methods B (Shell test or three Point Bend Test).
	- NACE Methods D (DCB Double Cantilever Bean Test).
	- SSRT (Slow Strain Rate Test).
	Proof Ring Test Apparatus for NACE Method "A".