API T95 Casing vs API P110 Casing
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
API T95 Casing
Pipe & Tube Steel
T95 is the stronger sibling of C90 in the API 5CT sour-service family: 95 ksi yield with the same 25.4 HRC hardness ceiling and sulfide-stress-cracking test regime. It serves deep sour wells where C90’s strength runs out but P110-class hardness would be an SSC hazard.
Standards: AISI API 5CT T95 · GB T95 (GB/T 19830)
API P110 Casing
Pipe & Tube Steel
P110 is the high-strength API 5CT casing grade for deep, high-pressure wells where collapse and burst loads exceed L80 capability. It is a Q&T product with a wide 110–140 ksi yield band and is not rated for sour service.
Standards: AISI API 5CT P110 · GB P110 (GB/T 19830)
Chemical composition compared (%)
| Element | API T95 Casing | API P110 Casing |
|---|---|---|
| P | ≤0.030 | ≤0.030 |
| S | ≤0.030 | ≤0.030 |
| Note | API 5CT controls T95 by strength, hardness and SSC testing — no C/Mn composition limits | Chemistry is mill practice (typically Cr-Mo Q&T) |
Properties compared
| Property | API T95 Casing | API P110 Casing |
|---|---|---|
| Yield strength | 655–758 MPa (95–110 ksi) | 758–965 MPa (110–140 ksi) |
| Tensile strength | ≥724 MPa (105 ksi) | ≥862 MPa (125 ksi) |
| Hardness | ≤25.4 HRC (sour-service cap) | — |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: API T95 Casing · API P110 Casing. Substitution decisions for certified parts stay with the design authority.