NXF UNS N10276 2.4819/NiMo16Cr15W/C276 OD DN15-1200 Class 3000-9000 Nickel Alloy Forging Fitting Butt Welding Olet

1. Material Cutting and Selection

Select round steel bars (carbon steel, stainless steel, alloy steel), reserve forging allowances according to the finished product dimensions, cut the billets to a fixed length using a sawing machine, clean the burrs on the end faces, inspect the appearance and material of the raw materials, and remove unqualified raw materials with inclusions, cracks, etc.

2. High - temperature Heating

Send the billets into an intermediate - frequency heating furnace for constant - temperature heating to the appropriate forging temperature, ensure uniform overall heating, control the temperature and time to prevent over - burning and severe oxidation, and endow the metal with good plasticity for easy forging and forming.

3. Die Forging and Forming

Place the hot billets into a special branch pipe tee mold and perform overall forging through a forging press. Forge the tee body base and the main body of the branch pipe in one press to form an integrated base with an arc that fits the curvature of the main pipe. After forming, cut off the peripheral flash waste and preliminarily correct the shape.

4. Cooling and Rough Finishing

Cool slowly or in the air according to the material requirements. For stainless steel, strictly control rapid cooling to prevent stress cracking. After cooling, perform rough grinding to trim the forging protrusions and irregular parts and ensure the smoothness of the base arc.

5. CNC Precision TurningFinely machine the arc surface and end face of the base on a lathe, machine the upper end socket or NPT/BSP external threads, and turn the welding bevel. Strictly control the aperture, thread accuracy, and arc size, and use go - no - go gauges to check the qualification of the threads.

6. Non - destructive Testing

Conduct magnetic particle and penetrant testing on high - pressure products to check for cracks and interlayer defects in the forging parts and the root of the threads. At the same time, verify all dimensions, specifications, and pressure ratings.

7. Surface Treatment and Warehousing

Galvanize or blacken carbon steel for rust prevention, perform pickling and passivation on stainless steel to remove the oxide scale. Engrave the specifications on qualified products with steel stamps, pack them by category, and store them in the warehouse.