Petroleum Cracking Alloy Pipe

• ​Introduction

Petroleum Cracking Alloy Pipe is a type of seamless steel pipe primarily utilized in the petroleum cracking process. It is designed to endure the harsh conditions of high temperature and pressure in petroleum cracking units, serving as a key conduit for transporting various fluids and gases.

• ​Main Functions

Transport High-Temperature and High-Pressure Media：Safely convey oil/gas mixtures under high-temperature and high-pressure conditions to ensure the smooth progress of the cracking process.​

Resist Thermal Fatigue and Creep Deformation：Maintain structural integrity during prolonged thermal cycling, preventing damage caused by repeated temperature changes.​

Withstand Sulfidation and Hydrogen Attack：Effectively resist corrosion from sulfur-containing compounds and hydrogen, extending the service life of the pipes.​

Sustain Mechanical Strength：Retain excellent mechanical properties, such as tensile strength and yield strength, even in extreme operating conditions.

• ​Tubing Standards

ASTM A335； EN 10216-2； GB/T 9948.

• ​Material & Performance

P2，P5，P11，P12，P22； X11CrMo5+I，X11CrMo5+NT，10CrMo5-5，13CrMo4-5，10CrMo9-10； 12CrMo，12Cr5Mo-I，12Cr5Mo-NT，12Cr1Mo，15CrMo，12Cr2Mo.

High Strength： Has a high tensile strength  and a high yield strength , ensuring reliable load-bearing capacity.​ Outstanding Thermal Stability：Maintain dimensional stability and mechanical properties at high temperatures, preventing deformation and failure.​ Superior Corrosion Resistance：Effectively resist sulfur, hydrogen, and acidic corrosion, significantly extending service life.

• ​Manufacturing Process

Raw Material Preparation：High-purity alloy steel billets are selected and inspected for chemical composition and impurities.

Hot Rolling：The billet is heated and rolled into a hollow tube via a piercing mill, or extruded to form the initial pipe shape.

Heat Treatment： Normalizing：Improves microstructure and mechanical properties. Tempering：Reduces internal stress and enhances toughness.

Cold Drawing/Expanding (Optional)：Fine-tunes dimensions and surface finish for precise applications.

Non-Destructive Testing (NDT)：Ultrasonic testing (UT), eddy current testing (ET), and hydrostatic pressure testing are conducted to ensure freedom from defects.

Surface Treatment：Deburring, coating, and marking for identification and protection.

• Specifications