Technical data on wear-resistant cladding elbow technology
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Technical requirements for high-alloy surfacing wear-resistant elbow fittings. High-alloy wear-resistant elbow fittings, wear-resistant linings. 1. Standard applicable to high-alloy wear-resistant elbow fittings: GB/T8163-1999 \"Seamless steel tubes for transporting fluids\"； GB/T 17395-1998 \"Dimensions, Shape, Weight and Allowable Deviations of Seamless Steel Tubes\" ； For the base pipes of high-alloy wear-resistant pipe fittings, seamless steel pipes that meet the standards of GB/T8163-1999 \"Seamless steel pipes for transporting fluids\" are generally used, and they are primarily employed in fluid transport pipelines in engineering projects and large-scale equipment. High-chromium alloy welding wire is selected for the welding wire. Production processes and technical requirements: 1. Materials: For pipe fittings, the steel tube material is 20# hot-rolled seamless tube, while the lining material is CrNiMo. 2. Production process: A high-chromium wear-resistant alloy layer is evenly deposited using an automatic arc welding machine; this results in a temperature range of 6000°C to 8000°C between the wear-resistant alloy layer and the surface of the seamless steel tube. The deposition technique shall comply with the “Technical Standards for Welding of Steel Structural Members” GB50661-2011. (i) For pipe fittings: The metallurgical bond depth reaches 2 MM, the joint surface is firm and tight; the thickness of the base seamless tube is 10 mm, the thickness of the wear-resistant layer on straight tubes is 4 mm, and the thickness of the wear-resistant layer on pipe fittings is 6 mm. 3. Mechanical properties: C, Cr, Mn, Si, Ni, Mo – 3.0～5.0, 25～30, 1.0～2.0, 0.5～1.5, 16, 1.5. Composition of welding materials: Wear-resistant layer: hardness (HRC) 70～75, impact toughness (J/cm) >14.2.https://pics6.baidu.com/feed/902397dda144ad34d9ff67ce71d37bfd30ad85b6.jpeg?token=da055f0af85d23a5421955f215c45123
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4. High-chromium alloy wear-resistant products: Wear-resistant pipe fittings such as wear-resistant elbows, tees, crosses, unions, bell mouths, reducers, and S-curves. 5. Corrosion protection: After manual rust removal, the surface must be cleaned thoroughly. Apply a coat of anti-rust red paint, as well as a topcoat on both sides; the painting should be even, and the color of the topcoat shall comply with the requirements of the client. 6. Quality inspection: \"Ultrasonic testing techniques for non-destructive testing of welds, testing levels and evaluation\", GB/T11345-2013; List of high-chromium alloy wear-resistant pipes, fittings, and wear-resistant linings. (I) Fittings: Name, Specification, Material, Unit, Quantity, Remarks. High-chromium nickel molybdenum wear-resistant fittings, DN(80–600), CrNiMo, T 150; High-chromium nickel molybdenum wear-resistant pipes, DN(80–600), CrNiMo, T 200
The bimetallic wear-resistant process involves solidifying the molten steel under gravity conditions that are dozens of times higher than those used in conventional casting, which effectively solves the problem of looseness inside the cast tube billets. The metal has a high density, resulting in excellent slag and gas removal performance. In terms of the production process, centrifugal forging is used for manufacturing straight double-metal wear-resistant pipes. This technique involves melting two types of metals together while they are in liquid state, thereby achieving a true metallurgical bond; the shear strength of this bond layer is higher than that of the base metal, allowing for perfect mechanical complementarity between the base layer and the wear-resistant layer ； Fittings such as elbows, tees, and reducers are manufactured using the lost foam vacuum suction casting composite process. This advanced technique effectively overcomes the challenge of being unable to combine curved pipes; it enables the seamless integration of curved pipes along with various other shaped pipes, without altering the path of material flow within these pipes, thereby **reducing the resistance to material transportation. Supply of lost foam vacuum suction casting composite process bimetallic wear-resistant elbows