What is API 5L grade X70?
API 5L X70 refers to a grade of pipeline steel pipe in the American Petroleum Institute (API) standard. The 'X70' indicates that the pipe has a minimum yield strength of 70,000 psi (pounds per square inch). This pipe is commonly used in the oil and gas industry, particularly for transmission pipelines, because it has high strength and good toughness to withstand high-pressure underground environments.API 5L X70 pipe is governed by API Spec 5L, which details the requirements and test methods for pipeline steel pipe.
X70 Chemical Composition
|
Grade |
C |
Si |
Mn |
P |
S |
V+Nb+Ti |
|
X70 |
≤0.12 |
≤0.45 |
≤1.70 |
≤0.025 |
≤0.015 |
≤0.15 |
X70 Mechanical Properties
|
Grade |
Yielding strength MPa |
Tensile strength MPa |
yield-to-tensile ratio |
|
X70 |
485-635 |
570-760 |
≥0.93 |
