USS RYS110: A Steel Grade for Sour Condensate Wells

2024-04-22 21:10　409 views

USS RYS110: A Steel Grade for Sour Condensate Wells with Enhanced SSCC Resistance

Reference: API 5CT, NACE TM0177, U.S. Steel Standard Mill Practice M-1041

Abstract

The USS RYS110 is a proprietary steel grade developed by U.S. Steel with a focus on applications within sour condensate wells. This article delves into the unique properties of USS RYS110, its resistance to sulfide stress cracking (SSC), and the standards it adheres to, including API 5CT and NACE TM0177.

Introduction

In the oil and gas industry, sour condensate wells present a unique set of challenges due to the presence of hydrogen sulfide (H2S). USS RYS110 steel is engineered to provide superior resistance to SSC, a common failure mode in such environments. This steel grade is designed to meet the stringent demands of these applications through precise control of its chemical composition, heat treatment, and hardness levels.

Material Properties

USS RYS110 is distinguished by its mechanical properties:

Yield Strength: It boasts a minimum yield strength of 110,000 psi and a maximum of 125,000 psi, offering a balance of strength and ductility.
Tensile Strength: The minimum tensile strength is 120,000 psi, ensuring the steel can withstand high tensile loads.
Hardness: With a mean maximum hardness of 29.0 HRC and an individual maximum of 30.0 HRC, USS RYS110 maintains a high level of durability.

Resistance to SSC

The resistance to SSC in USS RYS110 is achieved through meticulous control over its chemical composition and processing. This makes it suitable for use in environments where H2S is present, a common concern in sour condensate wells.

Standards Compliance

USS RYS110 adheres to the following standards:

API 5CT: The inspection requirements and dimensional tolerances for USS RYS110 comply with API 5CT for grade P110 PSL 1.
NACE TM0177: The steel grade is tested against sulfide stress cracking as per NACE TM0177, ensuring its reliability in H2S environments.

Performance Properties

The performance properties of USS RYS110 are equivalent to those of API grade C110, providing assurance of its capabilities in demanding applications.

Testing and Quality Assurance

To ensure quality and performance:

Hardness Testing: One quadrant through-wall hardness testing is conducted at a frequency of two samples per 100 pieces per heat lot.
SSCC Testing: While not mandatory for every order to reduce lead times, SSCC testing can be performed upon customer request. The testing follows U.S. Steel Standard Mill Practice M-1041, guaranteeing a minimum threshold stress of 80% of the specified minimum yield strength in 7% H2S NACE A solution (Method A) or 26 ksi√√-inch in full H2S NACE A solution (Method D).

Conclusion

USS RYS110 is a specialized steel grade designed to excel in the challenging conditions of sour condensate wells. Its adherence to API 5CT and NACE standards, coupled with its enhanced SSC resistance, positions it as a premier choice for applications where H2S is a factor.

References

API 5CT. "Specification for Casing and Tubing." American Petroleum Institute.
NACE TM0177. "Laboratory Testing of Metals for Resistance to Sulfide Stress Cracking in H2S Environments." National Association of Corrosion Engineers.
U.S. Steel. "Standard Mill Practice M-1041." U.S. Steel Corporation. (Year of Publication)

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