Material Data Sheet
Martensitic Stainless Steel - SM13CRM-110
SM13CRM is a Martensitic OCTG material often referred to as “Modified 13 Chrome”. Martensitic stainless steels are suitable for sweet (CO2) environments, under which standard Carbon and low alloy steels would suffer general and/or localized corrosion. SM13CRM has been developed with the main objective of being able to offer a high strength material while offering improved corrosion properties and larger application domain with regards to temperature and Chloride concentration over standard API L80-13CR.
SM13CRM was developed in 1997 and benefits from Nippon Steel’s unrivaled know-how in manufacturing martensitic stainless steel since the 70’s and best-in-class quality control.
SM13CRM-110 is manufactured based on API 5CT / ISO 11960.
Diameters: 2-3/8” – 16"
Weights: as per API 5CT/ISO 11960
Special application: Please contact Nippon Steel engineer, should You require specific size, weight, drift, or any other characterization.
- Proprietary SM13CRM series.TGP-2220 (latest revision)
- API 5CT / ISO11960
- API RP 5C1 / ISO 10405
- VAM Book
- Nippon Steel Storage and handling procedure for CRA materials
CO2 Corrosive well service, with temperatures up to 180 °C and high Chloride content.
Its primary functions are Tubing and Liner applications, sections permanently exposed to production fluids. SM13CRM is typically fit for deeper and HP-HT sweet applications thanks to its higher temperature threshold (up to 180°C) and increased Yield Strength compared to API L80-13CR.
SM13CRM also features excellent localized corrosion resistance in sweet environment, low pH, and High Chloride content. SM13CRM is particularly indicated after formation water breakthrough.
SM13CRM has limited SSC (Sulfide Stress Cracking) resistance and its usage shall be limited to sweet environment. In case SSC resistance is required, SM13CRS or higher grade material shall be considered.
Final material application will depend upon CO2, 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.
| PROCESS | DESCRIPTION |
|---|---|
| Steel making | Fine grained fully killed steel billets by the basic oxygen converter process or electric arc furnace process |
| Pipe making | Seamless |
| Heat treatment | Quenched and Tempered |
(mass %)
| C | Si | Mn | Ni | Cr | Mo |
|---|---|---|---|---|---|
| ≤ 0.03 | ≤ 0.50 | ≤ 1.00 | 4.0 ~ 6.0 | 11.0 ~ 14.0 | 0.2 ~ 1.2 |
| YIELD STRENGTH KSI |
TENSILE STRENGTH KSI |
ELONGATION % |
HARDNESS HRC |
TECHNICAL NOTE | |
|---|---|---|---|---|---|
| Min | Max | Min | Min | Max | |
| 110 | 125 | 110 | API Formula | 32.0 | - |
| UNIT | 25°C | 50°C | 100°C | 150°C | 200°C | 250°C | |
|---|---|---|---|---|---|---|---|
| Density | Kg/m3 | 7680 | 7670 | 7660 | 7650 | 7640 | 7620 |
| Young's modulus | GPa | 204 | 204 | 202 | 199 | 196 | 192 |
| Poisson's Ratio | - | 0.29 | 0.30 | 0.30 | 0.30 | 0.30 | 0.29 |
| Tensile strength de-rating | % | 100.0 | 95.7 | 91.8 | 87.7 | 85.6 | 83.5 |
| Yield strength de-rating | % | 100.0 | 94.7 | 91.1 | 86.7 | 84.5 | 82.6 |
| Thermal Diffusivity | x10-6 m2/s | 4.78 | 4.83 | 4.99 | 5.05 | 5.06 | 5.07 |
| Heat Capacity | x106 J/m3 deg.C | 3.38 | 3.53 | 3.62 | 3.80 | 3.96 | 4.13 |
| Thermal Conductivity | W/m deg.C | 16.2 | 17.0 | 18.0 | 19.2 | 20.0 | 20.9 |
| Specific Heat | J/Kg deg.C | 440 | 460 | 472 | 497 | 518 | 542 |
| Thermal expansion | x10-6 / deg.C | - | 11.0 | 10.7 | 10.8 | 10.8 | 11.0 |
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. 1).
Fig. 1: Corrosion rate of 13CR in different NaCl concentrations with CO2
This is basically associated with the fact that conventional API L80-13CR material 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.
The figure 2 below indicates that in high chloride high temperature environment API L80-13CR cannot withstand the corrosive environment. In the same conditions SM13CRM corrosion resistance performances surpass API L80-13CR and are as good as SM13CRS.
Figure 2: Corrosion resistance comparison of martensitic stainless steel
in high Chloride high temperature sweet environment
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.
Fig. 3: Pitting & General corrosion resistant of 13CR and Super 13CR in sweet environment
Figure 3 demonstrates the superior corrosion resistance of SM13CRM compared to conventional API L80-13CR under elevated temperatures while offering an alternative solution to SM13CRS material for usage in sweet environment.
The same figure 3 indicates that SM13CRM material due to an improved chemistry where Molybdenum and Nickel are added, provides enhanced pitting corrosion resistance.
For additional information about material performances please contact Nippon Steel engineers.
A selection of critical applications of SM13CRM is shown below. These Field records include SM13CRM 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 SM13CRM, 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.