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1. Overview & Characteristics

To send oil (gas) from the oil well to reserve tanks, steel pipes are used because of their cost effectiveness and safety.  These pipes are called line pipes.  Until now, only the oil wells with high economic value and easy exploration environment were drilled.  However, with an explosive increase of energy use and depletion of oil resources, oil fields with inferior quality oil are also being explored.  Such circumstances also led to oil field exploration in remote areas of the Arctic, deep seas, and Siberia.  Improved corrosion resistance and strength are imperative in steel materials as line pipes transport oil with high levels of sulfur and hydrogen .

2. Product Standards & Features

Product
Standard
Usage
Features
Hot Rolled Coil
API-X70, X80, X100
For cold regions
o X70 : TS 64 kg/mm² Impact toughness(-60°C) 20kg.m
o X80 : TS 70kg/mm², Impact toughness(-60°C) 17kg.m
o X100 : TS 81kg/mm², Impact toughness(-60°C) 17kg.m
   
API-X60,X65
(will be developed in 2001)
Anti-HIC
Anti-SSCC
o Requirements
- HIC : CLR≤15%, ETC≤0.1mm
- SSCC : SMYS 80%,90%-no  crack
o Production features: High clean steel, low center segregation, uniformity
API-X42,X46, X52,X56
* HIC : (Hydrogen Induced Crack)
* SSC : (Sulfide Stress Corrosion Crack)

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