Longitudinally Submerged Arc Welded (LSAW) steel pipes are commonly used in various industries for transporting fluids or gases. The raw materials used in the manufacturing of LSAW Steel Pipes can vary based on different standards and requirements.

Raw Material Requirements for LSAW Steel Pipes:

1. Steel Grade and Composition:

API 5L Standard:

Typically requires steel grades such as X42, X52, X60, X65, X70, etc.

Specific chemical composition requirements for carbon, manganese, sulfur, phosphorus, and other alloying elements.

EN Standard:

Common grades include S235, S275, S355 for structural applications.

Chemical composition adherence to EN standards for structural and pressure purposes.

2. Dimensional Requirements:

Diameter, wall thickness, and length requirements according to the specific standard (API, EN, ASTM, etc.).

Tolerances for outer diameter, wall thickness, ovality, and straightness.

3. Mechanical Properties:

Tensile strength, yield strength, and elongation requirements depending on the standard and intended application.

Impact toughness at specified temperatures for harsh environments.

4. Weldability:

Raw materials should have good weldability properties to ensure proper fusion during the welding process.

Low carbon content and appropriate alloying elements for good weldability.

5. Surface Quality:

Raw materials should be free from surface defects like cracks, laps, folds, and inclusions.

Clean and smooth surface finish to facilitate the welding and coating processes.

6. Corrosion Resistance:

For pipelines in corrosive environments, materials with enhanced corrosion resistance may be required.

Addition of alloying elements like chromium, nickel, or copper for improved corrosion resistance.

7. Impact Resistance:

Requirements for impact resistance to withstand external forces and loads during transportation and installation.

Charpy V-notch testing to evaluate impact resistance properties.

8. Non-Destructive Testing (NDT):

Raw materials may need to undergo NDT methods like ultrasonic testing, radiographic testing, or magnetic particle inspection to ensure quality and integrity.

9. Certification and Traceability:

Raw materials should come with mill test certificates (MTC) to verify compliance with the specified standards.

Traceability of raw materials back to their source for quality control and accountability.

10. Heat Treatment:

Heat treatment requirements for specific grades to achieve desired mechanical properties.

Normalizing, quenching and tempering processes as per the standard requirements.

Expanding further on the requirements for raw materials of LSAW steel pipes with different standards, here are additional considerations based on specific standards:

1. ASTM Standard:

Compliance with ASTM A252 for structural steel pipes or ASTM A53 for general use.

Material properties and chemical composition in accordance with ASTM specifications.

Impact testing and non-destructive examination requirements as per ASTM standards.

2. DIN Standard:

Conformance to DIN 2458 for welded steel pipes or DIN 17172 for pipelines for the transport of liquids and gases.

Material grades like St37.0, St44.0, St52.0 for general structural purposes.

Compliance with DIN standards for dimensional tolerances and mechanical properties.

3. JIS Standard:

Adherence to JIS G 3466 for structural steel pipes or JIS G 3454 for carbon steel pipes for pressure service.

Material grades like STK400, STK490 in accordance with JIS specifications.

Specific chemical composition and mechanical properties as per JIS standards.

4. GB/T Standard (Chinese Standard):

Conformance to GB/T 9711 for petroleum and natural gas industries or GB/T 3091 for low-pressure fluid transportation.

Material grades like Q235, Q345 for general structural purposes.

Dimensional requirements and mechanical properties specified by GB/T standards.

5. ISO Standard:

Compliance with ISO 3183 for pipelines transportation systems or ISO 4200 for general purposes.

Material grades and chemical composition in line with ISO standards.

Quality control measures as per ISO requirements for raw materials.

6. Quality Control:

Raw materials should undergo rigorous quality control measures including chemical analysis, mechanical testing, and visual inspection.

Compliance with specific quality standards set by the respective organizations (API, EN, ASTM, etc.).

Implementation of quality management systems to ensure consistency and traceability.

7. Environmental Impact:

Consideration of environmental impact during the production of raw materials, such as sourcing from sustainable suppliers.

Compliance with environmental regulations and standards in the manufacturing process.

8. Supplier Qualification:

Ensuring that raw material suppliers meet industry standards and have appropriate certifications.

Regular audits and assessments of suppliers to maintain quality and consistency.

By meeting these requirements for raw materials, manufacturers can produce high-quality LSAW steel pipes that meet the standards and performance expectations for various applications in industries such as oil and gas, construction, and infrastructure.