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SM13CRS-95

Coupling: Brown, Purple, Purple Pipe Body: Brown, Purple, Purple

General description

SM13CRS is a Martensitic OCTG material often referred to as “Super 13 Chrome”. Martensitic stainlesssteels are suitable for sweet (CO2) environments, under which standard Carbon and low alloy steelswould suffer localized corrosion also called mesa or ringworm corrosion. SM13CRS bridges the gap ofperformances between API L80-13CR and Duplex materials while providing a larger application domainwith regards to temperature, H2S content and Chloride concentration. SM13CRS was developed in 1992and benefits from SMI’s unrivaled know-how in manufacturing martensitic stainless steel since the 70’sand best-in-class quality control.

SM13CRS-95 is manufactured based on API 5CT / ISO 11960 and API 5CRA / ISO 13680

Diameters: 2-3/8” – 16"

Weights: as per API 5CT/ISO 11960

Special application: Please contact SMI engineer, should You require specific size, weight, drift, or anyother characterization.

Reference document

Proprietary SM13CRS series.TGP-2218 (latest revision)●

API 5CT / ISO11960●

API RP 5C1 / ISO 10405 ●

API 5CRA / ISO 13680 ●

VAM Book●

SMI Storage and handling procedure for CRA materials●

Applicable environment

CO2 Corrosive well service, with temperatures up to 180 °C , including trace amounts of H2S, andhigh Chloride content. Its primary function are Tubing and Liner applications, sections permanentlyexposed to production fluids.

SM13CRS is typically fit for deeper and HP-HT applications thanks to its higher temperature thresholdand increased Yield Strength compared to API L80-13CR.

SM13CRS is suitable for limited concentration of H2S, in combination with high content of Chloride withregards to SSC resistance

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SM13CRS also features excellent localized corrosion resistance in high Chloride content environmentswhile preserving excellent impact toughness values.

Final material application will depend upon CO2, H2S, Temperature, pH and expected Chlorides content.

In addition, compatibility with packer & completion fluids (brines and additives), matrix acidizing fluids,and scale dissolvers need to be ascertained.

For a more detailed assessment please contact SMI engineers.

Manufacturing

Process Description

Steel making Fine grained fully killed steel billets by the basic oxygen converterprocess or electric arc furnace process

Pipe making Seamless

Heat treatment Quenched and Tempered

Chemical Composition

(mass %)

C Si Mn Ni Cr Mo

≤ 0.03 ≤ 0.50 ≤ 0.50 5.0 ~ 6.5 11.5 ~ 13.5 1.5 ~ 3.0

UNS Number: S41426

Specified mechanical properties

Yield strengthksi

Tensilestrength

ksi

Elongation%

HardnessHRC

Technical Note

Min Max Min Min Max

95 110 105 API Formula 28.0 Please contact SMI engineer.

Physical and thermal properties

unit 25°C 50°C 100°C 150°C 200°C 250°C

Density Kg/m3 7730 7730 7710 7700 7690 7670

Young's modulus GPa 203 202 200 197 194 190

Poisson's Ratio - 0.30 0.30 0.30 0.30 0.30 0.29

Tensile strengthde-rating

%100.0 95.4 91.0 87.1 85.3 83.4

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unit 25°C 50°C 100°C 150°C 200°C 250°C

Yield strengthde-rating

%100.0 94.3 90.7 86.7 84.3 82.2

Thermal Diffusivity x10-6 m2/s 4.67 4.69 4.85 4.99 4.97 5.00

Heat Capacityx106 J/m3

deg.C3.39 3.58 3.67 3.80 3.98 4.12

Thermal Conductivity W/m deg.C 15.8 16.8 17.8 18.9 19.8 20.6

Specific Heat J/Kg deg.C 438 463 476 493 517 537

Thermal expansion x10-6 / deg.C - 10.5 10.9 10.8 11.0 11.1

Technical information

Wet CO2 corrosion mechanism (either as metal loss or localized corrosion) on CRA (Corrosion ResistantAlloys) materials is a temperature dependent phenomenon, increasing with higher temperatures.

Figure 1 below demonstrates the superior corrosion resistance of SM13CRS compared to conventionalAPI L80-13CR under elevated temperatures:

Fig. 1: Effect of temperature on corrosion resistance of SM13CRS(5%NaCl + 3.0MPa (450psi) CO2 + 0.001MPa (0.15psi) H2S)

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Figure 1 shows SM13CRS corrosion resistance capability up to 180°C considering a max allowablecorrosion rate of 0.1 mm/yr.

Figure 1 also demonstrates the lower SSC susceptibility of SM13CRS versus conventional API L80-13Cr,made here visible at low temperature, with limited amount of H2S corresponding to 0.15 psi, butsignificant Chloride content.

SM13CRS is listed in ISO-13680 as part of Group 1, Catergory 13-5-2.

A number of industry experts believe that NACE MR0175 / ISO 15156 applicable SSC domain for APIL80-13CR (H2S < 1.5 psia, pH > 3.5) may be too optimistic, especially in presence of large amount ofChloride ions.

On the other hand, NACE MR0175/ISO15156 does not differentiate SSC resistance of Conventional APIL80-13CR versus Super 13CR, while the latter material has achieved considerable success inenvironments being marginally sour but with high Chloride levels.

One of the main limitations of conventional API L80-13CR is its capability to withstand High chlorideenvironments leading to pitting corrosion initiation (see Fig. 2).

Fig. 2: Corrosion rate of 13CR in different NaCl concentrations with CO2

This is basically associated with the fact that conventional L80-13CR when exposed to corrosiveenvironments (CO2) tend to develop a spontaneous Cr-O (Chromium Oxide) passive film capable tocounter further corrosion. This Cr-O film is not sufficiently stable in presence of High Chlorides and willbe breached/disrupted leading to pitting corrosion initiation.

On the other hand, SM13CRS material due to an improved chemistry where Molybdenum and Nickelare added, provides enhanced pitting resistance as shown in Fig. 3.

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Fig. 3: Pitting & General corrosion resistant of 13CR and Super 13CR in sweet environment

For additional information about material performances please contact SMI engineers

Case history from the field

A selection of critical applications of Sumitomo Super 13CR Martensitic stainless steel is shown below.These Field records include SM13CRS-95 and SM13CRS-110 material used as Tubing and/or Liner:

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Storage and handling procedure

Health, Safety and Environment

While state-of-the-art HSE rules are applied throughout SMI manufacturing process, proprietary andspecific HSE regulations shall be applied along the life cycle of the pipe until it reaches its final positionin the well, according to each operator’s rules. This particularly applies to all phases of handling andtransportation, assembly on the rig floor, and rig return if applicable. OCTG are heavy and by natureunstable. Special care shall be paid to potential risks of injury whenever handling OCTGs. Walking onpipes shall be avoided at all times. Usage of Personal Protection Equipments (PPE) is mandatory.Equipment and procedures will be established to capture the possible wastes generated duringmaintenance (cleaning, coating, doping) and disposed according to local regulations. This applies inparticular to storage dope, running dope, or cleaning water wastes.

Best practices for transportation, handling and storage of OCTG in general are covered by ISO 10405 /API RP5C1. VAM Book is also a good source of handling practices for VAM connections. In addition tothese general rules, specific care is recommended pertaining to SM13CRS, because improper handlingcould affect the material performances and by extension the corrosion resistance:

Prevention of Spot Hardening●

Prevention of Iron contamination●

Adapted storage equipments and inspection practices, particularly in a wet and saline atmosphere●

Adapted running equipments and practices●

Prevention of corrosion on rig returns, particularly in presence of completion fluids●

For more specific information please refer to SMI Storage and handling procedure for CRAmaterials, or contact SMI engineers.