BA tube stands for Bright Annealed stainless steel tube. It is cold-drawn seamless/welded tubing processed under hydrogen vacuum protective atmosphere bright annealing, without pickling or oxidation scale, delivering mirror-smooth inner & outer surface and fully stress-relieved metal structure.
2. Common Material Grades & Chemical Composition (Main 304/316L)
304 (UNS S30400)
C ≤0.08%, Si ≤1.00%, Mn ≤2.00%, P ≤0.045%, S ≤0.030%, Cr 18.00–20.00%, Ni 8.00–10.50%, Fe balance
316L (UNS S31603, ultra-low carbon)
C ≤0.03%, Si ≤1.00%, Mn ≤2.00%, P ≤0.045%, S ≤0.030%, Cr 16.00–18.00%, Ni 10.00–14.00%, Mo 2.00–3.00%, Fe balance Other optional grades: 304L, 321, 310S
3. Mechanical & Physical Properties (Annealed Soft State)
Tensile Strength: ≥515 MPa
Yield Strength (0.2% offset): ≥205 MPa
Elongation: ≥35%
Hardness: HRB ≤90 (soft, easy bending/flaring)
Density: 7.93 g/cm³ (304 series); 7.98 g/cm³ (316 series)
Inner surface roughness: Ra ≤0.4 μm, low fluid residue, easy cleaning
4. BA Surface Feature (Core Advantage)
Mirror bright surface, no black oxide, no acid pickling traces
Ultra-low roughness, fewer bacteria & particle adhesion
Uniform passive film, stronger corrosion resistance than ordinary pickled AP tubes
Smooth inner wall reduces flow resistance, ideal for high-purity fluid/gas delivery
Balanced cost: cleaner than AP tube, more economical than EP electro-polished tube
5. Production Standards
ASTM A269, ASTM A270 (sanitary), ASTM A213, EN 10305, JIS G3459
6. Specifications Range
Outer Diameter: 5mm–146mm / 1/4″–4″
Wall Thickness: 0.5mm–6mm
Length: fixed 6m / 12m or customized cutting
Tolerance: OD ±0.05~0.1mm, wall thickness ±10%
7. Key Advantages
Stress-free after bright annealing, stable dimension, no deformation during bending & welding
Excellent rust & acid resistance, 316L resists chloride medium
High cleanliness, ultra-low particle residue
Great formability: flaring, bending, welding without cracking
Strict inspection: eddy current test, hydraulic pressure test, inner bore endoscopic inspection
8. Main Applications
Semiconductor & New Energy: UHP high-purity gas pipeline, hydrogen energy equipment
Pharmaceutical & Biotech: sterile process fluid piping, medical instrument tubing
Food & Beverage: sanitary conveying pipeline, dairy & beverage machinery
Precision Instrument: laboratory gas circuit, hydraulic control tubing
Chemical Industry: weak acid & salt medium heat exchanger tubes
Decoration & Automotive: automotive fluid lines, architectural bright decorative pipes
9. Packing
Tube ends sealed with plastic caps, single tube PVC film wrapped, bundled with steel strips, moisture-proof export packaging.
