All Hastelloy® C-22® tubing and fittings supplied by Central States Industrial (CSI) will meet the following criteria:

Surface Finish Designations

Finish CodeProduct Contact Surface

(Max Ra)*

Product Contact Surface Finish Treatment

(ID)

Non-Product Contact Surface

(Max Ra)

Non-Product Contact Surface Finish Treatment

(OD)

-PL20 µ-inch
(0.5 µm)
Mechanical Polish / As drawn32 µ-inch
(0.8 µm)
Mechanical Polish / As drawn
-732 µ-inch
(0.8 µm)
Mechanical Polish / As drawn32 µ-inch
(0.8 µm)
Mechanical Polish / As drawn
-P2525 µ-inch
(0.6 µm)
Electropolished**32 µ-inch
(0.8 µm)
Mechanical Polish / As drawn
-SFN/ASanitary Finish*** / Mill FinishN/AUnpolished (Mill)
-PUN/AUnpolished (Mill)N/AUnpolished (Mill)

*20/32 µ-inch Max Ra is an approximate value and is not guaranteed. Surface finish roughness shall be physically examined for “P25” using a profilometer calibrated to standards traceable to NIST. Surface finish roughness shall not be subject to physical examination for “P7” or “7”

**The interior surfaces shall be mechanically polished or as drawn to a 25 Ra µ-inch (0.8 µm) maximum finish for sizes ½” to 4” diameter. The electropolishing process may increase the Ra values post electropolishing and have areas of preferential etching (e.g. frosting, shadowing, ect). Final Ra values for electropolished tubing and fitting shall not be used as criteria of acceptance for this product.

***Sanitary finish is better than traditional commercial grade tube finish. Suitable for applications in sanitary/high purity hygienic industries.

CSI Part Number Designator

Tolerances

Standard Tolerances in Tubing Dimensions
Welded or SeamlessODOD ToleranceApplicable SpecificationWall ThicknessWall Thickness ToleranceCSI Surface Finish Designation
Seamless0.500 in
(12.7 mm)
+/- 0.005 in
(+/- 0.13 mm)
ASTM B6220.065 in
(1.65 mm)
+/- 15% of wall-PL
Seamless0.750 in
(19.1 mm)
+/- 0.005 in
(+/- 0.13 mm)
ASTM B6220.065 in
(1.65 mm)
+/- 10% of wall-PL
Seamless1.000 in
(25.4 mm)
+/- 0.005 in
(+/- 0.13 mm)
ASTM B6220.065 in
(1.65 mm)
+/- 10% of wall-PL
Welded1.000 in
(25.4 mm)
+/- 0.010 in
(+/- 0.25 mm)
ASTM B6260.065 in
(1.65 mm)
+/- 12.5% of wall-SF
Welded1.500 in
(38.1 mm)
+/- 0.010 in
(+/- 0.25 mm)
ASTM B6260.065 in
(1.65 mm)
+/- 12.5% of wall-SF
Welded2.000 in
(50.8 mm)
+/- 0.010 i
(+/- 0.25 mm)
ASTM B6260.065 in
(1.65 mm)
+/- 12.5% of wall-SF
Standard Tolerances in Fitting Dimensions
ODOD ToleranceWall ThicknessWall Thickness ToleranceCSI Surface Finish Designation 
0.500 in
(12.7 mm)
+/- 0.010 in
(+/- 0.25 mm)
0.065 in
(1.65 mm)
+/- 15% of wall-PL
0.750 in
(19.1 mm)
+/- 0.010 in
(+/- 0.25 mm)
0.065 in
(1.65 mm)
+/- 10% of wall-PL
1.000 in
(25.4 mm)
+/- 0.010 in
(+/- 0.25 mm)
0.065 in
(1.65 mm)
+/- 10% of wall-PL
1.500 in
(38.1 mm)
+/- 0.016 in
(+/- 0.40 mm)
0.065 in
(1.65 mm)
+/- 12.5% of wall-PL
2.000 in
(50.8 mm)
+/- 0.016 in
(+/- 0.40 mm)
0.065 in
(1.65 mm)
+/- 12.5% of wall-PL

The American Society of Mechanical Engineers (ASME) has prepared a standard intended for design, materials, construction, inspection, and testing of vessels, piping, and related accessories such as pumps, valves, and fittings for use in the biopharmaceutical industry, referred to as ASME-BPE. This catalog does not intend to address criteria in the ASME-BPE specification. The items offered within this catalog are in accordance with ASME-BPE dimensions.

PRODUCT MARKING

  • All Hastelloy C-22 tubing will meet dimensional criteria and mechanical properties as set forth per the current ASTM B622 (seamless) or ASTM B626 (welded) specifications. Due to marking/finish/acceptance criteria obtainable in C-22, tubing will not be marked ASME-BPE.
  • All C-22 fittings ending in -PL will be marked with BPE SF1 surface finish reference, UNS number N06022, CSI logo, and alloy lot number.
  • All C-22 fittings ending in -P25 will be marked with BPE SF6 surface finish reference.