A270

ASTM A270 – Standard Specification for Seamless and Welded Austenitic and Ferritic/Austenitic Stainless Steel Sanitary Tubing

ASTM A270 covers grades of seamless, welded,and heavily cold worked welded austenitic and ferritic/austenitic stainless steel sanitary tubing intended for use in the dairy and food industry and having special surface finishes.

manufacture:seamless,welded,heavily cold worked.

Mechanical Tests Required – Reverse Flattening Test, For welded tubes, one reverse flattening test shall be made on a specimen from each 1500 ft (457 m) of finished tubing.

Hydrostatic or Nondestructive Electric Test.

Stainless steel grades and chemical composition conform to table 1.

tolerance of A270

OD Tolerance WT Tolerance Length Tolerance
≤ 25.4mm
± 0.13mm
± 12.5%
≤ 101.6mm
+3.2mm-0mm
> 25.4mm, ≤ 50.8mm
± 0.20mm
> 101.6mm
+4.8mm-0mm
> 50.8mm, ≤ 76.2mm
± 0.25mm
> 76.2mm, ≤ 101.6mm
± 0.38mm
> 101.6mm, < 139.7mm
± 0.38mm
> 139.7mm, ≤ 203.2mm
± 0.76mm
> 203.2mm, < 304.8mm
± 1.27mm

surface finish:

  • Mill Finish — Afinish without additional polishing or operations intended to smooth the surface.
  • Finish No. 80 — A ground finish produced by polishing a tube with an abrasive media impregnated with No. 80 grit.
  • Finish No. 120 — A ground finish produced by polishing a tube with an abrasive media impregnated with No.120 grit.
  • Finish No. 180
  • Finish No. 240
  • Electropolished Finish—A bright reflective finish produced by electropolishing. The manufacturer may use other polishing operations prior to electropolishing.
  • Maximum Roughness Average (Ra) Surface Finish—The customer may specify a maximum Ra on the insidesurface, outside surface, or both. The measurement of surface roughness shall be in accordance with ASME B46.1.

supplementary requirement.

  • S1. Intergranular Corrosion Test
  • S2. Pharmaceutical Quality Tubing
  • S3. Chemical Cleaning (Passivation)
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