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High Collapse
& Sour Service - HS Series
Proprietary Grade designed for oil and gas wells where high external
pressures are anticipated in Sour Environment. High resistance to Sulphide
Stress Corrosion Cracking with a Collapse pressures higher than API
values are guaranteed.
Mechanical Properties
|
Steel Grade
|
Yield Strength
|
Minimun Tensile
Strength
|
Elongation
(% in 2") |
Maximun Hardness
|
NACE Method"A"
Threshold
|
|
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Ksi (Mpa)
|
Ksi (Mpa)
|
|
HRc
|
% SMYS
|
|
TN 80 HS
|
80-95 (551-655)
|
95 (655)
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According
to
API Formula |
22
|
90
|
|
TN 95 HS
|
95-110 (655-758)
|
105 (723)
|
25
|
90
|
|
TN 110 HS
|
110-125 (758-862)
|
115 (792)
|
29
|
85
|
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Maximum
Through-Wall Hardness Variation [HRc]
|
|
Wt ≤0.5"
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0.5" < wt <0.75"
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0.75" ≤ wt <1.0"
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Wt ≥ 1"
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|
3
|
4
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5
|
6
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Due to more difficult and complex conditions of the oil and gas production,
Tenaris has developed these special tubulars for wells where high external
pressures are anticipated in Sour Environments. Available in strengths
that go from 80,000 to 110,000 psi, these products have a high resistance
to collapse as well as an excellent performance in severe sour conditions.
The design and fabrication of the High Collapse & Sour Service
is based on the development of a carbon low alloy steels, as well as
a tight control process from steelmaking to the rolling and heat treatment.
State-of-the-art manufacturing processes provide a strict cleanness,
physical and metallurgical control as well as a tight dimensional control
that ensures an outstanding resistance to the hydrogen sulfide cracking
under high external pressures.
The main characteristics of the Tenaris High Collapse and Sour Service
products are listed below:
- Clean steel.
- Deep desulfurization.
- Low residual-elements contents.
- Tight chemical composition range.
- Low residual stresses.
- No cold-worked spots.
- Excellent Hardenabilty.
- High Tempering temperature.
- Fully Tempered Martensitic structure.
- Through-wall microstructural homogeneity
- Fine grain structure.
- High-impact toughness.
- Low wall thickness variation (eccentricity).
- Low ovality.
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