ALLLAND Steel Pipe Supply
Welcome to ALLLAND Steel Pipe Manufacturing.As a professional steel pipe manufacturer, ALLLAND Steel Pipe is committed to providing high-quality API 5CT T95 casing and tubing products to the global oil and gas industry. Leveraging mature heat treatment processes, a rigorous quality control system, and extensive experience in OCTG production, ALLLAND Steel Pipe offers T95 steel pipe solutions in a variety of sizes, wall thicknesses, and threading configurations to meet the high-pressure load-bearing, corrosion resistance, and long-term operational requirements of various oilfield projects.
Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience.
The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines.
With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!
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API 5CT T95 is a high-strength, hydrogen sulfide-resistant (sour service) steel grade used in oil casing and tubing, primarily for high-pressure, deep-well environments containing H₂S (hydrogen sulfide). It belongs to the high-strength sour service steel grade system within the API 5CT standard and is positioned between C90 and P110.
O.D.:
2-3/8″ – 20″
Length:
R1 / R2 / R3
Heat Treatment:
Quenched & Tempered
Standard:
API 5CT
Product Type:
Seamless Casing / Tubing
STC/LTC/BTC/Premium Connection
Surface Treatment:
Varnish Coating / Black Painted / Anti-rust Oil
| Grade | Yield Strength Level | H₂S Resistance | Typical Applications |
|---|---|---|---|
| J55/K55 | 55 ksi | ❌ | Shallow wells, conventional wells |
| N80 | 80 ksi | Partial | Medium-depth wells |
| L80 | 80 ksi | ✅ | Sour service wells |
| C90 | 90 ksi | ✅ | Deep sour service wells |
| T95 | 95 ksi | ✅ | High-pressure sour service wells |
| P110 | 110 ksi | ❌ (standard condition) | Ultra-deep high-pressure non-sour wells |
| Q125 | 125 ksi | ❌ | Ultra-deep ultra-high-pressure wells |
Because:
T95 must meet the following requirements:
Why is T95 suitable for sour service?
This is the key difference between T95 and standard P110.
What is sour service?
It refers to a corrosive environment containing:
H₂S
CO₂
chloride ions
and high-salinity water.
In this environment, the following is likely to occur:
| Failure Mode | English Abbreviation / Term |
|---|---|
| Sulfide Stress Cracking | SSC |
| Hydrogen-Induced Cracking | HIC |
| Stress Corrosion Cracking | SCC |
| Hydrogen Embrittlement | Hydrogen Embrittlement |
| Process | Function |
|---|---|
| Quenching | Increase strength |
| Tempering | Reduce brittleness |
This is the only way to achieve high strength, high toughness, and resistance to SSC all at once.
API 5CT does not specify a fixed chemical composition for T95; instead, it specifies performance requirements.
Common design approaches in the industry:
| Element | Typical Range |
|---|---|
| C | 0.25–0.40% |
| Mn | 0.50–1.50% |
| Cr | Properly added |
| Mo | Improves tempering stability |
| Ni | Improves low-temperature toughness |
| S/P | Ultra-low controlled |
The key point is not “high-alloy steel.”
Rather, it is “achieving sour service performance through heat treatment and clean steel processes.”
Deep sour wells are one of the most typical and critical application scenarios for API 5CT T95.
As oil and gas resources are increasingly developed in deep and ultra-deep formations, downhole environments place higher demands on the strength, corrosion resistance, and long-term service stability of casing and tubing.
Particularly in sour environments containing H₂S, conventional high-strength steel grades are prone to sulfide stress cracking (SSC), making T95 a critical choice for many deep well projects.
| Typical operating conditions usually include: | |
| Parameter | Range |
| Depth | 3000–7000 m |
| Pressure | 70–120 MPa |
| H₂S | Medium to high content |
| Temperature | 120–180°C |
In such environments, API 5CT T95 not only offers high resistance to crushing and internal pressure but also effectively reduces the risk of stress-corrosion cracking (SSC) caused by acidic media. As a result, it is widely used in production casing for deep oil and gas wells and in high-pressure tubing systems.
As a professional OCTG steel pipe manufacturer, ALLLAND Steel Pipe strictly controls the heat treatment process, hardness range, and steel cleanliness during the production of API 5CT T95 products to ensure long-term stable operation in deep-well acidic environments.
Leveraging a mature seamless steel pipe production system and comprehensive quality inspection processes, ALLLAND Steel Pipe is able to provide highly reliable API 5CT T95 casing and tubing solutions for global oil and gas projects.
With the rapid growth of unconventional natural gas development, HPHT (High-Pressure, High-Temperature) gas wells have become a key application area for API 5CT T95.
T95 is commonly used in:
In offshore oil and gas development, steel pipes must not only withstand high-pressure conditions downhole but also endure complex marine corrosion environments.
The marine atmosphere and seawater contain high levels of salt spray, chloride ions, and corrosive agents, which impose stricter requirements on casing materials for offshore sour wells.
Particularly in high-sulfur offshore oil fields such as those in the Middle East, T95 has become a common high-end casing steel grade for sour wells due to its excellent resistance to SSC and high pressure-bearing capacity.
Wells subject to mixed corrosion from both CO₂ and H₂S are considered one of the most severe and hazardous operating environments in the oil and gas industry.
API 5CT T95 is commonly used for:
Particularly in high-pressure, highly corrosive natural gas wells, T95 has become a critical material choice for enhancing long-term wellbore safety and stability.
| Item | L80 | C90 | T95 | P110 |
|---|---|---|---|---|
| Yield Strength | 80 ksi | 90 ksi | 95 ksi | 110 ksi |
| Sour Resistance | ✅ | ✅ | ✅ | ❌ |
| Sour Service Capability | Medium | High | Very High | Generally not suitable |
| SSC Risk | Low | Low | Relatively low | High |
| Deep Well Capability | Medium | High | Very high | Extremely high |
| Typical Applications | General sour wells | Deep sour wells | High-pressure sour wells | Ultra-deep non-sour wells |
Why do many high-pressure wells use T95 instead of P110?
This is a classic question in OCTG design.
Because:
Although the strength of P110 is higher:
YSP110 > YST95
However:
In H₂S environments, High strength ≠ greater safety. For this reason, many sour wells prefer to increase wall thickness and use T95 rather than P110.
API 5CT T95 is a high-performance OCTG steel grade designed for high-pressure, high-temperature, and H₂S-containing acidic environments, combining high mechanical strength with excellent resistance to sulfide stress cracking (SSC).
As global oil and gas development continues to expand into deeper, higher-pressure, and more corrosive environments, T95 has become a key material choice for high-end sour-service casing and tubing.
As a specialized OCTG manufacturer, ALLLAND Steel Pipe provides global customers with API 5CT-compliant T95 seamless casing and tubing solutions that meet the demands of complex oil and gas projects for strength, corrosion resistance, and long-term service stability.
