Material Data Sheet

• Proprietary SM13CRS series.TGP-2218 (latest revision)
• API 5CT / ISO11960
• API RP 5C1 / ISO 10405
• API 5CRA  / ISO 13680
• VAM Book
• Nippon Steel Storage and handling procedure for CRA materials

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

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

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

SM13CRS also features excellent localized corrosion resistance in high Chloride content environments while 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 Nippon Steel engineers.

(mass %)

UNS Number: S41426

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

Figure 1 below demonstrates the superior corrosion resistance of SM13CRS compared to conventional API 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)

Figure 1 shows SM13CRS corrosion resistance capability up to 180°C considering a max allowable corrosion 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, but significant 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 API L80-13CR (H₂S < 1.5 psia, pH > 3.5) may be too optimistic, especially in presence of large amount of Chloride ions.

On the other hand, NACE MR0175/ISO15156 does not differentiate SSC resistance of Conventional API L80-13CR versus Super 13CR, while the latter material has achieved considerable success in environments being marginally sour but with high Chloride levels.

One of the main limitations of conventional API L80-13CR is its capability to withstand High chloride environments 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 corrosive environments (CO₂) tend to develop a spontaneous Cr-O (Chromium Oxide) passive film capable to counter further corrosion. This Cr-O film is not sufficiently stable in presence of High Chlorides and will be breached/disrupted leading to pitting corrosion initiation.

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

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

For additional information about material performances please contact Nippon Steel engineers

A selection of critical applications of SM13CRS is shown below. These Field records include SM13CRS-95 and SM13CRS-110 material used as Tubing and/or Liner:

Health, Safety and Environment

While state-of-the-art HSE rules are applied throughout Nippon Steel manufacturing process, proprietary and specific HSE regulations shall be applied along the life cycle of the pipe until it reaches its final position in the well, according to each operator’s rules. This particularly applies to all phases of handling and transportation, assembly on the rig floor, and rig return if applicable. OCTG are heavy and by nature unstable. Special care shall be paid to potential risks of injury whenever handling OCTGs. Walking on pipes 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 during maintenance (cleaning, coating, doping) and disposed according to local regulations. This applies in particular 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 to these general rules, specific care is recommended pertaining to SM13CRS, because improper handling could 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 Nippon Steel Storage and handling procedure for CRA materials or contact Nippon Steel engineers