1. Divided by material:

Carbon Steel: ASTM/ASME A234 WPB, WPC

Alloys: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV

Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N

ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti

ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H

Low Temperature Steel: ASTM/ASME A402 WPL3-WPL 6

Performance Steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70

Cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leach, PVC, PPR, RFPP (reinforced polypropylene), etc.

2. According to the production method, it can be divided into pushing, pressing, forging, casting, etc.

3. According to the manufacturing standard, it can be divided into national standard, electric standard, ship standard, chemical standard, water standard, American standard, German standard, Japanese standard, Russian standard, etc.

4. According to its radius of curvature: it can be divided into long radius elbow and short radius elbow. A long-radius elbow refers to the outer diameter of the tube whose radius of curvature is equal to 1.5 times, i.e., R=1.5D; A short radius elbow means that its radius of curvature is equal to the outer diameter of the tube, i.e., R=1.0D. (D is the diameter of the elbow, R is the radius of curvature).

5. According to the pressure level: there are about seventeen kinds, which are the same as the pipe standards in United States, including: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80、SCH100、Sch120、Sch140、Sch160、XXS; Among them, STD and XS are commonly used.