Casing K 55

Updated September 20, 2026

Overview

Product sourcing insights & recommendations

18 来源

The term 'casing K55' primarily refers to API 5CT Grade K55 oil casing pipe, a medium-strength carbon steel tubular used extensively in the oil and gas industry for surface and intermediate wellbore sections Eastern-Steels Octalsteel. It is a critical component for isolating geological formations and supporting the well wall during drilling and completion Slb Eastern-Steels.

1. Product Specifications & Performance

K55 is often compared to J55, but it offers superior mechanical integrity, particularly in tensile strength Zc-Pipe.

* Mechanical Strength: Minimum yield strength of 379 MPa (55,000 psi) and a high minimum tensile strength of 655 MPa (95,000 psi), providing better axial load capacity than Grade J55 Baling-Steel Zc-Pipe.

* Heat Treatment: Unlike J55, Grade K55 requires mandatory Normalizing (N), which ensures a more uniform grain structure and eliminates hardness peaks in Electric Resistance Welded (ERW) seams Zc-Pipe Api-Pipe.

* Visual ID: Distinguished by two green bands painted on the pipe body for easy site identification Zc-Pipe.

2. Market Trends & Insights (2025–2035)

The market for K55 casing is heavily influenced by the global expansion of unconventional drilling (shale gas/tight oil) and tightening manufacturing regulations.

* Robust Growth: The global OCTG market, including K55, is valued at $57.71 billion in 2026 and projected to reach $107.26 billion by 2035, growing at a 7.13% CAGR Baling-Steel Alibaba.

* Regulatory Tightening: The full implementation of the API 5CT 11th Edition (2023–2025) has raised the bar for mill certifications, potentially restricting supply to higher-tier manufacturers Baling-Steel.

* Pricing Dynamics: As rig counts recover, K55 prices typically experience 8–12% hikes due to its sensitivity to Hot Rolled Coil (HRC) futures. Early booking is recommended to mitigate volatility Baling-Steel.

3. Sourcing Opportunities

Current B2B listings show a wide range of K55 casing products available for oilfield applications, with primary manufacturing hubs in China (Dongying, Tianjin, and Hebei) .

* Standard Sizes: Heavy availability in 13-3/8", 9-5/8", and 7" diameters, often quoted between $450 to $700 per ton depending on the order volume and technical PSL (Product Specification Level) requirements .

* Top Suppliers: Key manufacturers like Rigrs Oil Machinery Co., Ltd. and Cangzhou Ruitai Petroleum Machinery Co., Ltd. hold API certifications and offer custom fabrication for specific well depths .

Based on these market trends, you might want to:

Sources & References

18 sources cited · Verified industry data & reports

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