The 5 sections including:

1)?Refining Segment: American Standard> Medium Pressure> Medium and Small Caliber> Carbon Steel;

2)?Refining Segment: American Standard> Medium Pressure> Large Caliber> Carbon Steel;

3)?Refining Segment: American Standard> Medium Pressure> Stainless Steel, Alloy steel;

4)?Refining Segment: Chinese Standard> Medium Pressure;

5)?Oil Field Segment: Medium and Small Caliber> Carbon Steel,Stainless Steel, Alloy Steel.