NXF UNS S20910 XM-19 OD DN15-1200 Thickness SCH10-XXS Special Stainless Steel Butt Welding Straight/Reducer Tee

Machinability
Stainless steel grade UNS S20910 XM-19 has machinability characteristics that are similar to other austenitic stainless steels;however it requires slower speeds, more power, and higher rigidity due to its high work hardening rate. It is recommended that coated carbide tooling be used.
Forming
Stainless steel grade UNS S20910 XM-19 can be formed using the same methods applied for other austenitic stainless steels. More power for forming and forging is needed for this alloy. Forging can be done at 1177-1204°C (2150-2200°F).
Welding
Welding of stainless steel grade UNS S20910 XM-19 can be performed using traditional joining processes. Recommended filler metal should be UNS S20910 XM-19 (AWS E/ER209).
Caution should be taken while using autogenous, high power density joining processes such as EB or laser welding, due to low FN potential and severe outgassing possibility.
Heat Treatment
Final annealing process performed for several of the applications, is done at 1065°C (1950°F), which is followed by water
quenching. In case this material is used in a strongly corrosive environment, annealing should be done at 1121°C (2050°F). This alloy cannot be hardened by heat treatment.

Cutting: The pipe is cut into specific lengths (pipe blanks) using mechanical or saw cutting to ensure clean, square ends.

2. Hydraulic Bulging Process
This is the core cold-forming stage for small to medium-sized tees:
Molding: The pipe blank is placed into a hydraulic mold with a T-shaped cavity.
Internal Pressure: Ultra-high pressure liquid is injected into the blank, forcing the pipe wall to expand outward.
Axial Compensation: Simultaneously, horizontal cylinders apply axial thrust to both ends, "feeding" metal into the center to ensure the branch pipe reaches the required height and wall thickness.

3. Branch Trimming & Sizing
Opening: The enclosed top of the formed branch is removed via plasma or mechanical cutting.
Sizing: The tee undergoes a sizing process in a precision die to ensure the dimensions and the 90-degree angle meet
international standards (e.g., ASME B16.9).

4. Heat Treatment
Purpose: To eliminate internal stresses and work hardening caused by the cold forming process.
Methods: Depending on the material, processes such as Normalizing, Tempering, or Solution Annealing (for stainless steel) are performed to restore the mechanical properties and corrosion resistance.

5. Beveling & Machining
Beveling: The three ends of the tee are machined to create welding bevels (typically at a 37.5° angle) to facilitate subsequent butt-welding at the job site.
Surface Finishing: The product is shot-blasted to remove scale and may be coated with anti-corrosion oil or paint.

NDT (Non-Destructive Testing): Methods like Ultrasonic Testing (UT) or Magnetic Particle Inspection (MT) are used to check for cracks or defects.
Dimensional Check: Verification of outer diameter (OD), wall thickness (WT), and center-to-end dimensions.

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