Material Data Sheet

Please select a material application among SM series and proprietary grades.

Heritage Sour Service - SM-95TS

Coupling: Brown, Red, Blue
Pipe body: Brown, Red, Blue
General description

SM-95TXS is a low alloy Carbon steel OCTG material suitable for severe Sour Service applications while providing enhanced and guaranteed Collapse resistance compared to API ratings. SM-95TXS is a Sulfide Stress Cracking (SSC) resistant material, which production order is delivered with both SSC and Collapse proof tests.

SM-95TXS derived from the combination of Nippon Steel's unrivaled know-how in mastering both High Collapse and Sour Service technologies, interlocked with best-in-class quality control. SM-95TXS offers a tighter quality control compared to API T95 and is manufactured based on API 5CT/ISO 11960 PSL2 requirements.

Diameters: 4 1/2” to 13 3/8”. Larger diameters available upon request.

Weights: as per API 5CT/ISO 11960

Special application: Please contact Nippon Steel engineer, should You require specific size, weight, drift, or any other information.

Reference document
  • Proprietary SM-TS  series.TGP-2947 (latest revision)
  • API 5CT / ISO 11960
  • NACE MR0175 / ISO 15156-2
  • API 5C3 / ISO 10400
  • API 5C1 / ISO 10405
  • VAM Book
Manufacturing
PROCESS DESCRIPTION
Steel making Ladle refined, fully killed and vacuum degassed; continuously cast to a fine grained practice
Pipe making Seamless
Heat treatment Quenched and Tempered
Specified mechanical properties
YIELD STRENGTH
KSI		 TENSILE STRENGTH
KSI		 ELONGATION
%		 HARDNESS
HRC		 TECHNICAL NOTE
Min Max Min  Min Max  
95 110 105 API Formula  25.4 90% SMYS
1bar H2S, NACE A, Solution-A
Collapse: Refer to MDS / Tech Info
Physical and thermal properties
  UNIT 25°C 50°C 100°C 150°C 200°C 250°C
Density Kg/m3 7800 7790 7780 7760 7750 7730
Young's modulus GPa 213 211 209 206 203 200
Poisson's Ratio - 0.30 0.29 0.29 0.29 0.29 0.28
Tensile strength de-rating % 100 98.3 95.5 94.4 94.7 94.7
Yield strength de-rating % 100 99.3 96.4 91.7 90.3 88.2
Thermal Diffusivity x10-6 m2/s 12.3 12.3 11.9 11.3 10.6 9.96
Heat Capacity x106 J/m3 deg.C 3.61 3.79 3.83 3.97 4.15 4.34
Thermal Conductivity W/m deg.C 44.4 46.7 45.6 44.8 44.0 43.3
Specific Heat J/Kg deg.C 463 487 492 511 535 562
Thermal expansion x10-6 / deg.C - 12.5 12.4 12.6 12.8 13.0
Yield strength / Temperature

 

Technical information

While the increase of temperature minimizes SSC susceptibility as outlined in Figure 2, SM-95TS remains SSC resistant at all temperatures.

Dependency of SSC susceptibility on test temperature

Fig. 2 : Dependency of SSC susceptibility on test temperature.
Nippon Steel modified 4130 material,σappl=100%AYS, pH2S=100kPa at 25 deg.C, NACE Method A, solution A.
[Ref : R.D.Kane et,.al.J.Petroleum Technology, 1483(1977)]

In addition, Figures 2 features the major sensitivity of SSC resistance to the material strength : SSC susceptibility increases along with material Yield strength. On that regards, SM-95TS preserves its SSC resistance across the full range of its specified Yield strength range, as shown in Figure 3.

H2S partial pressure versus materials SSC behavior.

Fig. 3 : H2S partial pressure versus materials SSC behavior.
Nippon Steel modified 4130 material, σappl=100%AYS, 4PB, solution A, 25 deg.C.

While NACE TM0177 has standardized its testing environments to 100kPa H2S, Nippon Steel has explored SSC susceptibility at higher H2S partial pressure, as illustrated in Figure 3, in order to assess the robustness of its material designs and processes. SM-95TS was successfully tested up to 1000 kPa or 10 bar H2S, and is to be considered full fledge Sour Service.

Pipe dimensions such as Diameter (D) or wall thickness (t) and mechanical characteristics such as the material Yield Strength are the first parameters dictating tubular Collapse resistance. Figure 4 specifically illustrates the commensurate influence of the D/t ratio (Diameter over wall thickness).

Nippon Steel, on SM-TS High Collapse & Sour Service series, applies tighter tolerances to influential parameters, such as ovality, eccentricity, OD and wall thickness. In addition, a specific chemistry and strict heat treatment control are used to ensure steel structural homogeneity and low residual stresses.

Figure 4 demonstrates SM-95TS enhanced performances compared to API T95 collapse resistance (derived from API 5C3 / ISO 10400 formula), through its physical test results, guaranteeing the published minimum Collapse ratings.

Collapse pressure on SM-95TS versus API T95

Fig. 4 : Collapse pressure on SM-95TS versus API T95

Table 5 features SM-95TS High Collapse values for a large selection of pipe sizes. They exceed API T95 collapse ratings by a factor ranging from +10% to +40%.

Table 5 : SM-95TS High Collapse values

SM95TS table

Table 5 covers most common sizes and wall thicknesses; upon request Nippon Steel can provide larger sizes up to 16", specific or tailor-made sizes, weights or special drifts.

For additional information about material performances please contact Nippon Steel engineers.

Storage and handling procedure

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 SMC110T, because improper handling could affect the material performances and by extension the corrosion resistance :

  • Prevention of Spot Hardening

For more specific information please contact Nippon Steel engineers.