API 5L X Grades

Grade Chemical Composition Yield Strength
Tensile Strength
Yield to Tensile
Elongation C Si Mn P S V Nb Ti min. (KSI) min. (KSI) Ratio (max) % API 5L X52 0.16 0.45 1.65 0.020 0.010 0.07 0.05 0.04 52 66 0.93 21 API 5L X56 0.16 0.45 1.65 0.020 0.010 0.07 0.05 0.04 56 71 0.93 19 API 5L X60 0.16 0.45 1.65 0.020 0.010 0.08 0.05 0.04 60 75 0.93 19 API 5L X65 0.16 0.45 1.65 0.020 0.010 0.09 0.05 0.06 65 77 0.93 18 API 5L X70 0.17 0.45 1.75 0.020 0.010 0.10 0.05 0.06 70 82 0.93 17

API 5L General Information

The API SPEC 5L specification provides standards for pipe suitable for use in conveying gas, water, and oil in the natural gas and oil industries. The API SPEC 5L covers seamless and welded steel line pipe. It includes plain-end, threaded-end, and belled-end pipe, as well as through-the-flowline (TFL) pipe, and pipe with ends prepared for use with special couplings.

Pipe manufactured to ASTM106 Grade A or B are not interchangable with API 5L. Requirements to API 5L X grades are more stringent; rolled grades are not acceptable and rework is not allowed. Moreover, particular attention is given to toughness and toughness tests for sour services and higher pressure & temperature classes.

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Strength Levels & Desulphurization

Manganese sulphides are typical inclusions in all manganese alloyed steels. Because they tend to segregate resulting in reduced impact strength, sulphure content needs to be minimized. We specify maximum 0.007%.

API 5L Benefits & Applications

• Gas, water and oil transportation - preferred in long pipelines due to inexpensiveness
• Pipeline steel - resistance to crack propogation
• Line Pipe / Sour Service Line Pipes

API Standard Specification for Line Pipe

The American Petroleum Institute specification API 5L addresses seamless and welded steel line pipe for pipeline transportation systems in the petroleum and natural gas industries.  API 5L is suitable for conveying gas, water, and oil.  

Specifications for API 5L adhere to the International Organization for Standardization ISO , standardizing pipeline transportation systems within the materials, equipment and offshore structures for natural gas, petroleum, and petrochemical industries.  When authoring the standards, the technical committee recognized that there are two basic Product Specifications Levels (PSL) of technical requirements and therefore developed PSL 1 and PSL 2.  PSL 1 is a standard quality for line pipe where PSL 2 contains additional chemical, mechanical properties, and testing requirements. 

Grades covered by this specification are A25, A, B and "X" Grades X42, X46, X52, X56, X60, X65, X70, and X80.  The two digit number following the "X" indicates the Minimum Yield Strength (in 000's psi) of pipe produced to this grade.

ASTM A53 seamless pipe is an American standard seamless steel pipe formulated by the American Society for Testing and Materials (ASTM). It corresponds to domestic low-carbon steel materials (such as Q235 grade). It is made of high-quality carbon structural steel and is produced through hot rolling or cold drawing. It has no welds and uniform overall performance.

API 5L seamless pipe is a special seamless steel pipe for pipelines with standards set by the American Petroleum Institute (API). It is mainly used in long-distance transportation pipeline systems for energy such as oil and natural gas, and has extremely high requirements for safety and environmental resistance. Its materials cover multiple steel grades from low carbon steel to high-strength alloy structural steel, such as L245 (B grade), L360, L485, and even high-strength X80, X100, etc.

ASTMA53 Seamless Pipe VSAPI 5LSeamless Pipe

1.  Different standards

ASTM A53 is the American national standard for general seamless steel pipes. It provides specifications for seamless steel pipes for general purposes, covering requirements from materials, dimensions to test methods, etc., to ensure the quality of steel pipes in general use scenarios. API 5L is the American Petroleum Institute standard, which is specifically for pipeline pipes and makes detailed provisions for the key properties of steel pipes such as strength, toughness, and corrosion resistance required under oil and gas transportation conditions.

2.  Different application scenarios

ASTM A53 seamless pipes are widely used in general pressure piping, such as building water supply and drainage pipe systems, to stably transport water; in mechanical manufacturing, mechanical parts, such as some shaft parts, are made, using their comprehensive performance to meet structural support and transmission requirements. API 5L seamless pipe is mainly used for professional pipelines such as oil and natural gas transportation. For example, in deep-sea oil extraction, the oil pipeline from the seabed oil platform to the land has harsh working conditions that place extremely high demands on the performance of steel pipes.

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3.  Different performance emphasis

ASTM A53 seamless pipe focuses on comprehensive performance. On the basis of meeting certain strength and toughness, it also has good processing performance and welding performance, making it widely used in conventional scenarios. API 5L seamless pipe emphasizes high strength to withstand high-pressure transportation; high toughness to prevent rupture due to stress concentration under complex geological conditions; corrosion resistance, and can work stably for a long time in oil and gas environments containing corrosive media such as hydrogen sulfide and carbon dioxide.

ASTM A53: The strength grade is relatively basic, including only two steel grades, A and B.

Grade A: tensile strength ≥330MPa, yield strength ≥205MPa;

Grade B: tensile strength ≥415MPa, yield strength ≥240MPa;

The overall strength meets the low-pressure working condition, and there is no extension to higher strength grades.

API 5L: The strength coverage is extremely wide, ranging from basic steel grades to high-strength steel grades.

Basic steel grade (such as L245/B grade): tensile strength ≥415MPa, yield strength ≥245MPa (close to A53 B grade);

High-strength steel grade (such as X80): tensile strength reaches 555-705MPa, yield strength ≥555MPa, far exceeding the performance upper limit of A53, and can meet the needs of high-pressure transportation.

Summary

ASTM A53 seamless pipe and API 5L seamless pipe have obvious differences in standards, applicable scenarios and performance emphasis. When you are in general industrial scenarios such as construction and machinery manufacturing, the performance requirements for steel pipes are relatively conventional. ASTM A53 seamless pipe is a good choice. Its comprehensive performance and diverse materials can meet a variety of needs. If you are in the oil and gas transportation industry, facing high pressure, complex geology and corrosive media, API 5L seamless pipe has become the key to ensuring the long-term stable operation of the pipeline with its high strength, high toughness and corrosion resistance. When actually selecting, you must accurately select the appropriate seamless pipe based on the specific needs and working conditions of your own project, so that every piece of material can be used to its full potential and maximize its value.

For more api 5l seamless pipe(pt,sw,th)information, please contact us. We will provide professional answers.