TP304 TP316L Stainless Steel Pipe Seamless Pipe Precison Cold Drawn SS Pipes ASTM A269

TP304 TP316L Stainless Steel Pipe Seamless Pipe Precison Cold Drawn SS Pipes ASTM A269

Products Specification

Bright Annealed Stainless Steel Tube (BA tube) is a kind of high-precision stainless steel tube with special heat treatment and surface treatment, which has a smooth, bright appearance and excellent corrosion resistance. The following is a detailed introduction to bright annealed stainless steel pipes:

1. Main Grade of Bright Annealed Stainless Steel Pipe Tube
Bright annealed stainless steel pipe commonly used stainless steel grades include:

Austenitic stainless steel:

304/304L (06Cr19Ni10/022Cr19Ni10)

316/316 (06 cr17ni12mo2 l / 022 cr17ni12mo2)

321 (06Cr18Ni11Ti)

Martensitic or ferrite stainless steel:

430 (10Cr17)

420 (20Cr13)

2. Enforce standards
The production and inspection of bright annealed stainless steel pipes usually follow the following international or national standards:

International standard:

ASTM A269/A270 (Universal Seamless and Welded Austenitic Stainless Steel Pipe)

ASTM A312 (Austenitic Stainless Steel Seamless Welded Pipe)

EN 10305 (Precision Seamless Steel Pipe)

Domestic standard:

GB/T 12771 (Welded stainless steel pipe for fluid transport)

GB/T 14976 (seamless stainless steel pipe for fluid transport)

YB/T 5363 (Bright annealed stainless steel welded steel pipe)

Step 3: Characteristics
High surface finish: through bright annealing treatment (heating and cooling in an oxygen-free or protective atmosphere), the surface is free of oxidation, a mirror or matte effect, roughness (Ra) is usually ≤0.4μm.

Strong corrosion resistance: the annealing process eliminates the processing stress, improves the uniformity of the material and the resistance to intergranular corrosion.

High dimensional accuracy: suitable for occasions with strict tolerances, such as instruments, medical equipment, etc.

Clean and pollution-free: no oil, no residue on the surface, suitable for high clean environment (such as food, semiconductor industry).

4. Application field

• Medical instruments: surgical instruments, medical catheters, implants, etc. (commonly used 316L BA tube).
• Food and beverage industry: pipeline, dairy equipment, brewing equipment, etc.
• Semiconductors and electronics: high purity gas/liquid delivery systems, vacuum chambers.
• Automotive industry: fuel systems, sensor components.
• Home and decoration: high-end furniture, lamps, bathroom accessories (such as 304 BA pipe).

5. Production process

• Cold rolling or cold drawing: Obtain high dimensional accuracy.
• Bright annealing: heating to 1050~1150°C under the protection of hydrogen or nitrogen to avoid surface oxidation.
• Pickling or electrolytic polishing (optional) : Further improve the surface finish.
• Non-destructive testing: ensure that there are no cracks, pores and other defects.

6. The difference with other stainless steel pipes

• Characteristics Bright Annealing Tube (BA) Ordinary Annealing Tube (AP) Pickling Tube (AP)
• Surface specular/matte, no oxide dull, oxide matte, slightly rough
• Excellent corrosion resistance (no decarburization layer) average (need subsequent pickling) good (after pickling)
• Cost higher lower medium

Bright annealed stainless steel pipe with its high cleanliness, corrosion resistance and aesthetics, widely used in the field of hygiene and precision requirements. The selection should match the brand and standard according to the specific working conditions (such as medium, temperature, pressure).