Sunrise petro
Mud Pump
Flowline Products
About Us
OCTG Products
Contact Us

API Q125 Steel Grade Specifications

2024-04-25 10:54 282 views

API Q125 Steel Grade Specifications for Deep Well Applications

API Q125 is a high-strength steel grade designated by the American Petroleum Institute (API) for use in deep well service. It is specifically designed to provide the necessary mechanical properties to withstand the extreme pressures and loads encountered in deep drilling operations. However, it is not generally intended for use in sour condensate wells.

Mechanical Properties

The mechanical properties of API Q125 steel grade are as follows:

  • Minimum Yield Strength: 125,000 psi
  • Maximum Yield Strength: 150,000 psi
  • Minimum Tensile Strength: 135,000 psi
  • Maximum Hardness: No limit specified – hardness variation requirement

These properties ensure that API Q125 steel can accommodate the high stresses typical of deep well environments, without compromising on safety or structural integrity.

Testing and Inspection

API Q125 steel is subject to rigorous testing and inspection protocols to ensure its suitability for deep well service:

  • Hardness Testing: Quadrant hardness testing is required, ensuring uniformity across the steel's surface without any specified limits other than the variation between readings.
  • Impact Testing: Impact testing is mandatory for each heat and/or lot, verifying the steel's toughness and resistance to fracture under low-temperature conditions.
  • Non-Destructive Testing (NDT): NDT inspection is required, with two methods of inspection typically employed. Electromagnetic (EMI) and Ultrasonic Testing (UT) are commonly performed on API Q125 products to detect any internal or surface defects.

Applications and Limitations

While API Q125 steel is ideal for deep well service, it is not generally recommended for sour condensate wells. This is due to its material properties that may not provide the necessary resistance to sulfide stress cracking (SSC) and other forms of corrosion associated with sour environments.


  • American Petroleum Institute. (n.d.). API Specification 5L - Specification for Line Pipe. Retrieved from https://www.api.org/standards/pipeline
  • National Association of Corrosion Engineers. (n.d.). NACE MR0175/ISO 15156 - Material Requirements for Sulfide Stress Cracking Resistant Metallic Materials for Oil and Gas Industries. Retrieved from https://www.nace.org/standards

You may like : Sucker Rod Accessories Sucker Rod Pump 

petroleum equipment supplier

Sunrise Petroleum mainly produce Pumping unit, OCTG pipe, Sucker rod pump, Wellhead and christmas tree, EOR equipment and other products, it is a reliable manufacturer and supplier in China. email : sales@sunrise-petroleum.com

Have inquiries about OCTG Oil and Gas? Look no further! For all your questions and concerns, simply send an email to sales@sunrise-petroleum.com. Our team is committed to providing a swift and informative response, guaranteed within 12 hours. We are here to assist you with your every need, ensuring a prompt and efficient service experience. Reach out today for your OCTG Oil and Gas queries!

  • API T95 Steel Grade Specifications
    API T95 is a controlled yield strength steel grade specified by the American Petroleum Institute (API) for use in sour service applications, which are characterized by the presence of hydrogen sulfide (H2S). This grade is designed to offer superior resist
  • USS C90 Steel Grade Specifications
    USS C90 is a proprietary restricted yield strength steel grade developed by U.S. Steel for specialized use in sour condensate wells. This high-strength steel is designed to provide exceptional resistance to sulfide stress cracking (SSCC), making it an ide
  • Q125 HC Steel Grade
    Q125 HC is a high-strength steel grade designed for applications within the oil and gas industry where enhanced collapse resistance is required. Manufactured to meet the stringent API 5CT specifications, Q125 HC offers superior performance characteristics
  • Q125 HP Steel Grade
    Q125 HP is a high-performance steel grade manufactured to meet the rigorous demands of the oil and gas industry, particularly for applications requiring exceptional collapse resistance. This product is designed to exceed the minimum internal yield pressur
  • USS HCK55 Casing Steel Grade
    USS HCK55 is an Electric Resistance Welded (ERW) hot-finished proprietary steel casing grade developed by U.S. Steel for "High Collapse" K55 applications. This advanced steel grade is engineered to provide exceptional strength and resistance to collapse,