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USS HCK55 Casing Steel Grade

2024-04-25 10:34 711 views

USS HCK55 Casing Steel Grade for High Collapse Applications

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, making it ideal for use in demanding downhole environments.

Mechanical Properties

  • Minimum Yield Strength: 55,000 psi
  • Maximum Yield Strength: 95,000 psi
  • Minimum Tensile Strength: 95,000 psi
  • Maximum Hardness: 21.0 HRC

The mechanical properties of USS HCK55 steel grade are carefully controlled to ensure the steel's ability to withstand high stresses and prevent collapse in high-pressure and high-collapse applications.

Inspection and Testing

Inspections for USS HCK55 follow the same rigorous standards as API K55. Each yield-tensile test is accompanied by through-wall hardness testing to verify the uniformity and consistency of the steel's hardness across the entire cross-section.

Collapse testing is an essential part of the quality assurance process for USS HCK55 steel grade. It is required for each run on the first, middle, and last heat of production to ensure the steel's collapse resistance meets the stringent requirements for high-collapse applications.


  • American Petroleum Institute. (n.d.). API Specification 5L - Specification for Line Pipe. Retrieved from https://www.api.org/standards/pipeline
  • U.S. Steel. (n.d.). USS HCK55 Casing Steel Data Sheet. (Note: This is a placeholder and should be replaced with the actual data sheet or technical documentation for USS HCK55 when available.)

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