Elbow in the pipeline system, elbow is to change the direction of the pipe fittings. According to the angle, there are 45 ° and 90 ° 180 ° three most commonly used, in addition, according to engineering needs also include 60 ° and other non-normal angle elbow. Elbow materials are cast iron, stainless steel, alloy steel, malleable iron, carbon steel, non-ferrous metals and plastics. Connected to the pipe in the following ways: direct welding (the most common way) flange connection, hot fusion connection, electrofusion connection, threaded connection and socket connection. According to the production process can be divided into: welding elbow, stamping elbow, pushing elbow, casting elbow, etc.. 1. Divided by material. Carbon steel: ASTM/ASME A234 WPB, WPC Alloy: 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 steels: ASTM/ASME A402 WPL3-WPL 6 High performance steels: ASTM/ASME A860 WPHY 42–46–52–60–65–70 Cast steel, alloy steel, stainless steel, copper, aluminium alloy, plastic, argon chrome leach, PVC, PPR, RFPP (reinforced polypropylene), etc. 2. Divided by production method can be divided into pushing, pressing, forging, casting, etc. 3. Divided by its radius of curvature: can be divided into long-radius elbow and short-radius elbow. Long radius elbow refers to its radius of curvature is equal to 1.5 times the outer diameter of the tube, that is, R = 1.5D; short radius elbow refers to its radius of curvature is equal to the outer diameter of the tube, that is, R = 1.0D. (D for the elbow diameter, R for the radius of curvature). 4. If divided by pressure level: there are about seventeen kinds, and the United States pipe standard is the same, there are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160 The two most common types are STD and XS. 5. According to the different shapes of use can be divided into: grooved elbow, ferrule elbow, double-bearing elbow, flange elbow, reducer elbow, stay seat elbow, inside and outside the tooth elbow, stamping elbow, pushing elbow, socket elbow, butt welding elbow, internal wire elbow, etc. Founded in 1982, Jianzhi is a leading manufacturer and supplier of cast iron pipe fittings. Till now, Jianzhi has about 4,500 employees and more than 350 technical engineers with distributors covering over 100 countries around the world. Jianzhi is committed to building a safer world by bringing premium cast iron pipe fittings to every household and building. BUSINESS MODEL OFBUSINESS MODEL Cooperating with distributors all over the world and working to make the list grow is the business model of Jianzhi. Helping all partners to unleash their untapped potential and make profits is the service philosophy of Jianzhi. On the manufacturing side, Jianzhi strictly controls the cost to ensure a stable supply of high-quality products and fast delivery. On the marketing side, JIANZHI helps the customers to formulate their marketing strategies. The over 90% reorder rate shows the recognition from every customer.