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13CR-HP2: Martensitic Stainless Steel

Common Names:

HP2, Hyper II

Alloy Group

Martensitic Stainless Steel

Corrosion Resistance

Mild

Yield Strength

80

—

140

Wall Tolerance

0.875

Density

0.276

PREN

19.59

—

23.9

Additional Documentation

Alloy Details

The Super 13 Chrome alloys, including UNS S41426 and 13CR-HP2, are quenched and tempered martensitic stainless steels designed for corrosion resistance in sweet (CO2) and mildly sour (H2S) environments with moderate chloride content, effective up to 350°F.

Compared to standard 13 Chrome, Super 13 Chrome alloys offer enhanced mechanical properties and improved resistance to CO2, H2S, chlorides, pH variations, and high temperatures. Their higher strength and better temperature performance make them suitable for deeper wells with high-pressure, high-temperature (HPHT) conditions, where they are used in downhole tubular components, packers, and other subsurface equipment. Additionally, Super 13 Chrome alloys exhibit superior resistance to H2S and chlorides compared to Modified 13 Chrome, making them ideal for mild sour environments.

UNS S41426 is listed in NACE MR0175/ISO 15156 Table A.19, with a recommended limit of 1.5 psi partial pressure of H2S. It is classified by API 5CRA/ISO13680 as Group 1, Category 13-5-2 alloy, approved for sour service in the 95 ksi yield strength condition.

Martensitic Stainless Steel

Martensitic stainless steels, such as 13 Chrome and its enhanced variants, are widely used as downhole tubular components in mildly corrosive environments, such as sweet (CO2) wells, where carbon and low alloy steels experience general corrosion. These alloys are typically quenched and tempered to achieve yield strengths in the range of 80 to 140 ksi.

Chemical Composition

C
6
Carbon
0.04%
Si
14
Silicon
1%
P
15
Phosphorus
0.02%
S
16
Sulfur
0.005%
Cr
24
Chromium
12%‒14%
Mn
25
Manganese
0.25%‒1%
Fe
26
Iron
75.935%‒81.45%
Ni
28
Nickel
4.5%‒5.5%
Mo
42
Molybdenum
1.8%‒2.5%

Specified Mechanical Properties

API 5CRA / ISO 13680 Group 1 Category 13-5-2
GradeYield
Strength
ksi		Tensile
Strength
ksi		Elongation
%		Hardness
HRC		NACE MR0175/ISO 15156
H2S Sour Service Limits
minmaxminminmax
80809590Function of specimen size27Table A.19H2S ≤ 1.5 psi,
pH ≥ 3.5
959511010527
11011014011532110 Grade not recommended for sour service

* Non-standard mechanical properties and grades are made available upon agreement.

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