TORICH 133 * 4 * 4113 mm 304L precision stainless steel tubing is manufactured for applications requiring controlled diameter, roundness, straightness, surface condition, and dimensional repeatability. The tube has a nominal outside diameter of 133 mm, a nominal wall thickness of 4 mm, and a finished length of 4113 mm.

The low-carbon TP304L material provides good weldability and resistance to intergranular corrosion after welding. The tubing can be supplied seamless or welded and cold-finished according to the approved drawing, purchase specification, and inspection plan.

• Controlled dimensional accuracy: The tube can be cold-drawn and finish-sized to control the outside diameter, inside diameter, wall thickness, roundness, and straightness. For this specific component, the required inside diameter is 124.5-125.2 mm, roundness deviation is limited to 0.10 mm, and total straightness deviation is limited to 0.50 mm over the 4113 mm length.
• Low-carbon weldable stainless steel: TP304L has a maximum carbon content of approximately 0.035% under commonly applied ASTM tubular specifications. The reduced carbon level limits chromium-carbide precipitation in the heat-affected zone and improves resistance to intergranular corrosion in welded components.
• Clean and inspectable surfaces: The inner and outer surfaces can be supplied free from visible cracks, folds, heavy scale, harmful dents, deep pits, embedded contamination, and severe handling damage. Surface roughness can be controlled to Ra ≤ 3.2 μm.
• Traceable heat treatment: ASTM A269 requires applicable tubing to be supplied in a heat-treated condition. For TP304L, solution annealing restores corrosion resistance and ductility after cold working.

• Dimensional control based on the finished component: TORICH can control the tubing against a finished inspection plan covering outside diameter, inside diameter, wall-thickness variation, roundness deviation, full-length straightness, and finished length.
• Surface-defect and cleanliness management: Inspection criteria specifically prohibit visible cracks, inner-wall pits deeper than 0.10 mm, scratches deeper than acceptance limits, oil contamination, rust, and end deformation.
• Standard and drawing reconciliation before production: Before production, TORICH reconciles material grade, manufacturing method, dimensional standards, technical delivery standards, customer drawing tolerances, and all requirements to reduce disputes.

This 133 * 4 * 4113 mm TP304L precision tube can be used as a cylindrical sputtering target backing tube for a rotary magnetron coating assembly.

In this component, the stainless steel tube provides:

• A dimensionally stable cylindrical support
• Controlled concentricity for target bonding
• A smooth internal passage for cooling-water circulation
• Weldable ends for connection components
• Corrosion resistance during handling and cooling service
• Straightness suitable for continuous target rotation

Dimensional inspection:

• Outside diameter checked with calibrated measuring equipment
• Inside diameter checked with bore gauges or approved equivalent equipment
• Wall thickness checked by ultrasonic or mechanical measurement
• Roundness deviation not exceeding 0.10 mm
• Overall straightness deviation not exceeding 0.50 mm
• Finished length controlled to 4113 mm with a tolerance of 0/+10 mm

Appearance inspection:

• Internal and external surfaces free from harmful cracks, laps, scabs, folds, severe dents, and deformation
• Surface roughness: Ra ≤ 3.2 μm
• Inner-wall pits deeper than 0.10 mm are not permitted
• Harmful scratches are not permitted
• Ends free from severe deformation and elliptical cutting
• Bore free from oil, loose scale, rust, and foreign matter
• Embedded carbon-steel contamination shall be avoided

Testing options:

• Chemical analysis verification
• Tensile testing
• Hardness testing
• Flattening or flaring test
• Eddy-current testing
• Ultrasonic testing
• Hydrostatic testing
• Pneumatic leak testing
• Intergranular-corrosion testing
• Surface-roughness measurement
• Positive material identification
• Dimensional inspection report

TP304L tubing is normally supplied solution annealed. The exact annealing temperature and cooling method depend on the governing material standard, product dimensions, and manufacturing route.

For bright-annealed tubing, heat treatment is performed in a controlled atmosphere to limit oxidation and produce a clean, bright surface. For pickled tubing, oxide scale formed during heat treatment is removed by an appropriate descaling and passivation process.