Main Specifications & Range

StandardsAPI 5CT, API 5B, GOST 632-80
OD4 1/2", 5", 5 1/5", 6 5/8", 7", 7 5/8", 8 5/8", 9 5/8", 10 3/4", 11 3/4", 13 3/8", 16", 18 5/8", 20"
GradesH40, J55, K55, M65, N80, L80, C90, C95, R95, T95, P110, Q125
LengthR1, R2, R3
ThreadsAPI & GOST threads, VAM premium thread replacement

More Than Just Casing

We are experts of oilfield tubulars with years of experience in manufacturing.
Thanks to our extensive selection of casing pipes, you will most certainly find what you are looking for.

Production is based on lean production principles and just-in-time delivery, enabling us to significantly reduce delivery times. The improved manufacturing process is also a major reason for the constant high quality of Sovonex API casing.

Casing Steel Grades

Most casing steel grades are largely of the same chemical composition. What gives each grade its distinct properties is the kind of heat treatment applied. Casing grades mainly differ in their yield strength, tensile strengths, and hardness.

Additional tests required by API 5CT for certain groups of casing make sure that each casing grade is suitable for its intended application.

Common Application Casing (H40, J55, K55, M65, N80, R95)

Due to their lower price compared to other steel grades, casing pipes of grades J55, K55, and N80 are a popular choice for wells without stringent anti-corrosion or strength requirements.

M65, and R95 are newer grades, each with their own field of application.
These casing grades mainly differ in their yield strength and tensile strength.

H40
  • Yield strength: 276-552 MPa (40-80 ksi),
  • Minimum tensile strength: 414 MPa (60 ksi)
  • API color code: Either none or 1 black band
J55
  • Yield strength: 379-552 MPa (55-80 ksi),
  • Minimum tensile strength: 517 MPa (75 ksi)
  • API color code: 1 bright green band
K55

API grade K55 has the same yield as grade J55, but its minimum tensile strength is about 26% higher compared to J55.

  • Yield strength: 379-552 MPa (55-80 ksi),
  • Minimum tensile strength: 665 MPa (95 ksi)
  • API color code: 2 bright green bands
M65

Not used that often, M65 is the only steel grade among the general purpose casing grades with the requirement of a restricted maximum hardness.

  • Yield strength: 448-586 MPa (65-85 ksi),
  • Minimum tensile strength: 586 MPa (85 ksi)
  • API color code: 1 bright green band, 1 blue band
N80 (N80-1, N80-Q)

Both N80-1 and N80-Q have the same yield strength and tensile strength, but N80-Q, which is quenched and tempered, shows a higher resistance to internal pressure and collapsing.

On the other hand, casing N80-1 is cheaper to produce and the first choice were a higher collapse resistance in not needed.

  • Yield strength: 552-758 MPa (55-80 ksi),
  • Minimum tensile strength: 689 MPa (100 ksi)
  • API color code: 1 red (N80-1), 1 red band, 1 bright green band (N80-Q)
R95

Same yield strength range and tensile strength as grade T95, but without the requirement for SSC or hardness tests. Steel grade R95 therefore is a better-priced alternative to T95 in wells without the risk of sulfide stress cracking.

  • Yield strength: 655-758 MPa (95-110 ksi),
  • Minimum tensile strength: 727 MPa (105 ksi)
  • API color code: 1 brown band

Corrosion-Resistant Casing (L80,C90,T95, C110)

Sour Service

API 5CT steel grades L80-1, C90, T95, and C110 show a higher resistance to sulfide stress cracking in H2S environments due to lower limits of sulfur and phosphorous as well as the addition of the following mandatory tests:

  • Hardness: Limited maximum hardness (L80,C90,T95, C110)
  • Grain size: Grain size finer than ASTM 5 (C90, T95, C110)
  • Sulfide stress cracking (SSC): Passing NACE 0177 (C90, T95, C110)

Sweet Service

Casing grades L80-9Cr and L80-13Cr are suitable for application in CO2 environments, mainly because of their higher chromium content.

L80 (L80-1, L80-9Cr, L80-13Cr)
  • Yield strength: 552-665 MPa (80-95 ksi),
  • Minimum tensile strength: 655 MPa (95 ksi)
  • API color code (bands): 1 red, 1 brown (L80), 1 red, 1 brown, 2 yellow (L80 9Cr), 1 red, 1 brown, 1 yellow (L80 13Cr)
C90 (C90-1)
  • Yield strength: 621-724 MPa (90-105) ksi,
  • Minimum tensile strength: 689 MPa (100 ksi)
  • API color code: 1 purple band
T95 (T95-1)
  • Yield strength: 655-785 MPa (95-110 ksi),
  • Minimum tensile strength: 724 (105 ksi)
  • API color code: 1 silver band
C110
  • Yield strength: 758-828 MPa (110-120 ksi)
  • Minimum tensile strength: 793 MPa (115 ksi)
  • API color code: 1 white band, 2 brown bands

Note that despite that additional test requirements, it is the responsibility of the buyer to determine if a given sour service casing grade is suitable for the intended application.

Deep Well Casing (P110, Q125)

With the highest yield strengths among all API 5CT casing grades, P110 and Q125 are ideally suited for high pressure formations in deep wells.

However, as steel becomes more susceptible to sulfide stress cracking the higher the yield strength, both grades should not be used in H2S environments.

P110
  • Yield strength: 758-965 MPa (110-140 ksi)
  • Minimum tensile strength: 862 MPa (125 ksi)
  • API color code: 1 white band
Q125 (Q125-1)
  • Yield strength: 862-1,034 MPa (125-150 ksi)
  • Minimum tensile strength: 931 MPa (135 ksi)
  • API color code: 1 orange band

API Connections

Sovonex casing can be furnished with all standard API 5CT casing couplings, namely:

  • Buttress thread coupling (BTC)
  • Short round thread coupling (STC)
  • Long round thread coupling (LTC)

We also provide premium casing connections as a lower cost alternative to VAM Top and former VAM New proprietary connections.

Heat-Resistant Casing (HR Casing)

We have developed a special casing that is resistant to high temperatures, combined with excellent pressure performance. Resistant to steam injection temperatures of 375 ℃ and pressures of 21MPa, Sovonex heat-resistant casing is ideally suited for use in thermal recovery wells.

HR casing greatly reduces the risk of corrosion and casing failure prevalent in thermal recovery operations.

Available in diameters from 4 1/2” to 7”.

GOST Casing

The Russian GOST 632-80 standard extends API 5CT and includes special connections such as OTTG, OTTM, and TBO.

Certified by the Russian national standards body, Sovonex GOST casing has a strong competitive advantage in the Russian market as well as other countries of the Commonwealth of Independent States.