The design of our High Collapse and Sour Service grades is based on the development of carbon low alloy steels. The manufacturing process is strictly controlled from steelmaking through rolling and heat treatment.
grades to withstand high pressures in corrosive environments
Tenaris has developed the High Collapse and Sour Service steel grades to meet the needs of oil and gas operations in environments characterized by a combination of high external pressure and the probability of corrosion cracking due to the presence of H2S.
We offer our High Collapse and Sour Service grades in a range of yield strengths from 80Ksi to 110Ksi.
Mechanical Properties
| Grade | Minimum Yield Strength (KSI)
| Minimum Tensile Strength (KSI) | Maximum Hardness (HRC) | NACE Method A Threshold % SMYS |
|---|
| TN 80HS |
80 |
95 |
22 |
90 |
| TN 95HS |
95 |
105
|
25
|
90 |
| TN 100HS |
100 |
105
|
27
|
85 |
| TN 110HS |
110 |
125
|
29
|
85 |
Maximum Through-Wall Highness Variation [HRc]
| WT < 0.5" | 0.5" < WT < 0.75" | 0.75" < WT < 1.0" | WT > 1.0" |
|---|
| 3 |
4 |
5 |
6 |
In addition to uniform external pressures, high pressures can be exerted by reservoir, ground movements or saline stratus, subjecting pipes to extreme localized external pressure. Hydrogen sulfide dissolved in water may lead to Sulfide Stress Cracking. The factors that activate the cracking phenomena include: high stress state, high acidity levels, H2S partial pressure and a susceptible microstructure.
The design of the High Collapse and Sour Service grades is based on the development of carbon low alloy steels. The manufacturing process is strictly controlled from steelmaking through rolling and heat treatment.
Our state-of-the-art manufacturing facilities guarantee strict cleanliness, physical and metallurgical control as well as tight dimensional controls to ensure outstanding resistance to hydrogen sulfide cracking under high external pressures.