J55 And K55 Casing and Tubing
Size Range
Size:4” To 20” Or Customized
Material:API 5CT J55,API 5CT K55.Hot Rolled,Normalized,Quenched and Tempered.
Standard:PSL1 Or PSL2.
Length:R1,R2,R3.
Ends:BTC,EUE,VOM TOP And Premium connection.
Please Feel Free To Contact Us For The Latest Quotation!
Inspection Requirement
When You Purchase A Batch Of J55 Or K55 Oil Casing, We Need To Pay Attention To The Following Inspections:
- General Inspection: Dimensional Inspection, Appearance Inspection, And Marking Inspection.
- Chemical Composition: Mainly Inspecting C, Mn, P, And S Elements.
- Mechanical Property: Tensile Strength, Yield Strength, Elongation, And Hardness Test.
- Other Test:Hydraulic Pressure Test, Ultrasonic Testing, Magnetic Particle Or Eddy Current Testing, And Radiographic Testing.
Stock Your J55&K55 Casing and Tubing
Balingsteel Has A Fixed J55 And K55 Material Oil Casing Plan Every Month. We Have A Large Number Of Common Size Stocks In Our Warehouse, Such As 9-5/8 Size, BTC, EUE, And Common Buckle Type. If You Need A Special Buckle Type, We Only Need To Get Your Confirmation And Immediately Arrange To Customize Your Oil Casing With The Buckle Type You Specified. Feel Free To Contact Us For A Quote.
J55 and K55 Casing Material Standards
Chemical Composition Requirements |
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| Element | J55 | K55 |
| Carbon (C) | No maximum specified (typically ≤0.30%) | No maximum specified (typically ≤0.30%) |
| Manganese (Mn) | No maximum specified (typically ≤1.50%) | No maximum specified (typically ≤1.50%) |
| Phosphorus (P) | ≤0.030% | ≤0.030% |
| Sulfur (S) | ≤0.030% | ≤0.030% |
| Other elements | Not specifically regulated, controlled by manufacturer | Not specifically regulated, controlled by manufacturer |
Mechanical Property Requirements |
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| Property | J55 | K55 |
| Minimum Yield Strength | 379 MPa (55,000 psi) | 379 MPa (55,000 psi) |
| Maximum Yield Strength | 552 MPa (80,000 psi) | 552 MPa (80,000 psi) |
| Minimum Tensile Strength | 517 MPa (75,000 psi) | 655 MPa (95,000 psi) |
| Minimum Elongation | A = 1,940,000 × (cross-sectional area^0.2) / (tensile strength) typically 12%-16% | |
Hardness Requirements |
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| Hardness Index | J55 | K55 |
| Maximum Hardness | Typically not exceeding HRC 23 or HRB 100 | |
Heat Treatment Condition |
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| Heat Treatment | J55 | K55 |
| Allowed Conditions | Normalized, normalized & tempered, or hot-rolled Typically normalized or normalized & tempered |
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Manufacturing Process |
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| Process Parameter | J55 | K55 |
| Manufacturing Process | Seamless or welded pipe process | |
| Welding Requirements | Welded area must be heat treated | |
| Forming Process | Hot-rolled or cold-drawn/cold-rolled process | |
Material Impact Toughness Requirements |
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| Impact Toughness | J55 | K55 |
| Standard Conditions | Not mandatory | Not mandatory |
| Special Environments | Impact toughness testing according to user requirements (low temperature, sulfur-containing environments, etc.) | |
Dimensional Tolerances |
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| Dimensional Tolerance | J55 | K55 |
| Outside Diameter Tolerance<br>(≤114.3mm) | ±0.79mm | |
| Outside Diameter Tolerance<br>(>114.3mm) | ±0.01D (D is nominal outside diameter) | |
| Wall Thickness Upper Deviation | 0.125 | |
| Wall Thickness Lower Deviation | -0.125 | |
Choose Your J55&K55 Casing
We Can Almost Treat J55 And K55 As The Same Material, But There Are Still Slight Differences Between The Two. The Minimum Tensile Strength Requirement Of K55 Is Higher Than That Of J55, Which Is 655 Mpa (95,000 Psi). Therefore, If You Have A Little Requirement For Performance, Please Choose K55 Oil Casing. Feel Free To Contact Us For FOB China Prices Of J55 And K55 Casing.