Project Description
Introductions:
Casing and tubing for Sour Oil and Gas Service must have a good anti-SSCC (sulfide stress corrosion and cracking) performance in the environment where hydrogen sulfide corrosion exists. After an indepth study, we has successfully developed tubular goods of the Cr-Mo series for this purpose with good hardenability and tempering stability that when tempering takes places at certain temperatures uniform and fine sorbite structures can be obtained. Their mechanical properties can meet fully the requirements of corresponding grades and their anti-SSC performance is excellent by regulating the chemical composition and adopting different heat treatment procedures.
Standard:
API 5CT Specification for Casing and Tubing
Grade and Mechanical Properties:
| Grade | Yield Strength (Ksi) | Tensile Strength (Ksi) | Hardness (HRC) | Threshold Stress (SMYS) |
|---|---|---|---|---|
| 80ksiS | 80-95 | 95 min | 22 max | 85% min |
| 80ksiSS | 80-95 | 95 min | 22 max | 90% min |
| 90ksiS | 90-105 | 100 min | 24 max | 85% min |
| 90ksiSS | 90-105 | 100 min | 24 max | 90% min |
| 95ksiS | 95-110 | 105 min | 25 max | 85% min |
| 95ksiSS | 95-110 | 105 min | 25 max | 90% min |
| 100ksiSS | 100-115 | 110 min | 28 max | 85% min |
| 110ksiSS | 110-125 | 120 min | 30 max | 85% min |
| 125ksiSS | 125-140 | 130 min | 35 max | 85% min |
Size Range:
- Outer Diameter: 4-1/2 inch – 13-3/8 inch
- Thickness: 5.21 mm – 15.88 mm
Characteristics:
- Materials: The chemical compositions have been carefully determined to provide resistance to sulfide stress corrosion as well as to insure complete through wall hardening.
- Heat Treatment: Quenching and Tempering are conducted under rigid temperature control to assure homogeneous physical properties and microstructures.
- Micro Structure: These grades exhibit fully tempered martensite which is considered to be the most desirable for resistance to sulfide stress corrosion cracking.
- Tensile Properties and Hardness: Yield Strength is limited within a narrow range and hardness is controlled to within the predetermined maximum limit.
- Sulfide Stress Cracking (SSC) Performance: Whole grades are designed for 85% or 90% SMYS in NACE condition. Excellent SSC resistance has been achieved through rigorous, chemical composition, heat treatment, microstructure, tensile properties, hardness and so on.
Pipe inspection:
A full length non destructive inspection is performed in accordance with API 5CT for external and internal, longitudinal and transverse defects with a standard notch depth equal to 5% of the specified wall thickness.
We are committed to integrate steel resources in china and serve the global steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in China.
What’s more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want. We provide preffesional one-stop service to the Contractors of follows project:
- Oil and Gas Pipeline Construction
- Onshore and Offshore
- Boiler Manufacturers
- Oil Refining Equipment
- Petroleum and Chemical Plant Construction
- Fire Protection
- Heating & Air Conditioning
Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets we serve. Just give us a call +86-731-89903933.
