Petroleum Cracking Seamless Tubes

Purchasing Guide for Petroleum Cracking Seamless Tubes

 

Ensuring Safety and Efficiency in Oil & Gas Operations

In the oil and gas sector, petroleum cracking tubes are core components of critical equipment; their quality directly dictates the safety and efficiency of extraction operations. Because the petroleum cracking process involves high temperatures, high pressures, and corrosive media, these components must be manufactured using high-quality seamless steel pipes to ensure reliable equipment operation and a long service life.

 

I. Key Performance Requirements

 

1. High-Temperature and High-Pressure (HTHP) Resistance

The petroleum cracking process typically operates at elevated temperatures ranging from 400°C to 800°C and high pressures between 10 MPa and 30 MPa. This requires seamless steel pipes to possess:

·       Excellent High-Temperature Strength: Maintaining structural integrity under thermal stress.

·       Creep Resistance: The ability to resist slow, permanent deformation over long periods of exposure.

 

2. Superior Corrosion Resistance

The cracking process involves corrosive media such as Hydrogen Sulfide (H₂S), Carbon Dioxide (CO₂), and Chlorides. Particularly under HTHP conditions, corrosion rates accelerate significantly. Selecting specialty alloy steel is essential to prevent premature wall thinning or localized pitting.

 

3. Resistance to Hydrogen Damage

During hydrocracking, hydrogen atoms can permeate the steel lattice, causing hydrogen embrittlement and a subsequent loss of material toughness. Pipes must be designed to resist High-Temperature Hydrogen Attack (HTHA) to prevent catastrophic brittle failure.

 

II. Five Key Factors for Material Selection

 

1. Material Grade

Cr-Mo series alloy steels (such as 15CrMo, 12Cr1MoV, and 1Cr5Mo) should be prioritized. These specialized materials offer the specific metallurgical properties required to meet the stringent operational demands of refinery environments.

 

2. Manufacturing Process

Only hot-rolling or cold-drawing seamless production processes should be utilized to ensure the pipe body is weld-free and possesses a uniform, dense microstructure. Advanced Thermo-Mechanical Control Processes (TMCP)—including controlled rolling and cooling—can further refine grain size and enhance mechanical properties.

 

3. Dimensional Accuracy

Precise dimensional control is critical for equipment fitment and leak prevention. Standards should include:

·       Outside Diameter (OD) Tolerance: Within ±0.75%.

·       Wall Thickness (WT) Tolerance: Within  ±10%.

These tolerances ensure assembly precision and reliable sealing performance in high-pressure circuits.

 

4. Heat Treatment Process

Appropriate heat treatment—specifically Normalizing + Tempering—optimizes the steel's microstructure. The stability of the heat treatment regime directly dictates the quality consistency and the material's ability to resist high-temperature oxidation and corrosion.

 

5. Quality Certification

Purchased tubes must be accompanied by comprehensive quality documentation, including:

·       Mill Test Reports for chemical and mechanical verification.

·       Heat Treatment Records and Non-Destructive Testing (NDT) reports (Ultrasonic/Eddy Current).

·       Compliance with international standards: API , ASTM, etc.

 

Contact Us

For high-quality seamless steel pipes that meet international safety standards, contact Shanghai ShengQiu Materials Co., Ltd.

·       WhatsApp: 008613761124029

·       Email: sales@sqsteelpipe.com

·       Website: www.sqsteelpipe.com