A269 Welded Ferritic Tubing
Ferritic steel refers to low-carbon chromium stainless steel with a chromium content greater than 14%, and any carbon-containing chromium stainless steel with a chromium content greater than 27%. Belonging to this category are Crl7, Cr17Mo2Ti, Cr25, Cr25Mo3Ti, Cr28, etc.
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Product Introduction
The structure of ferritic steel in the quenched (solid solution) state is ferrite, while a small amount of carbides and intermetallic compounds can be seen in the structure of the annealed and aged state.
A269 Stainless Steel Welded Pipe Specification
| Standard | ASTM A268, ASME SA268 |
|---|---|
| Tube Type | Both Welded And Seamless |
| Grades | ASTM A268 TP 410, ASTM A268 TP 430, ASTM A268 TP 439 |
| Outside Diameter | 1/4″ (6.25mm) To 8″ (203mm) |
| Wall Thickness | 0.02″ (0.5mm) To 0.5″(12mm) |
| Application | Heat Exchanger, Heater, Condenser |
ASTM A269 Stainless Steel Tubing Sizes Tolerance
| Outside Diameter, In.[Mm] | OD Tolerance, In.[Mm] | Wall Thickness, % | Thin Wall Tubes |
|---|---|---|---|
| Up To1⁄2, [12.7], Excl | ±0.005 [0.13] | ±15 | |
| 1⁄2 To 11⁄2 [12.7 To 38.1], Excl/Td> | ±0.005 [0.13] | ±10< | Less Than 0.065 In. [1.6 Mm] Nominal |
| 11⁄2 To 31⁄2 [38.1 To 88.9], Excl | ±0.010 [0.25] | ±10 | Less Than 0.095 In. [2.4 Mm] Nominal |
| 31⁄2 To 51⁄2 [88.9 To 139.7], Excl | ±0.015 [0.38] | ±10 | Less Than 0.150 In. [3.8 Mm] Nominal |
| 51⁄2 To 8 [139.7 To 203.2], Incl | ±0.030 [0.76] | ±10 | Less Than 0.150 In. [3.8 Mm] Nominal |
ASTM A268 Welded Tube Tensile Requirements
| Grade And UNS Designation | Tensile Strength, Min, | Yield Strength, Min, | ElongationA B , In 2 In. Or 50 Mm, |
|---|---|---|---|
| Ksi [MPa] | Ksi [MPa] | Min, % | |
| TP405 S40500 | 60 [415] | 30 [205] | 20 |
| … S40800 | 55 [380] | 30 [205] | 20 |
| TP410 S41000 | 60 [415] | 30 [205] | 20 |
| TP429, TP430, And TP430 Ti S429000, S 43000, And S 43036 | 60 [415] | 35 [240] | 20 |
| TP443 S44300 | 70 [485] | 40 [275] | 20 |
| TP446-1 S44600 | 70 [485] | 40 [275] | 18 |
| TP446-2 S44600 | 65 [450] | 40 [275] | 20 |
| TP409 S40900 | 55 [380] | 25 [170] | 20 |
| TP439 S43035 | 60 [415] | 30 [205] | 20 |
| S43932 | 60 [415] | 30 [205] | 20 |
| … S41500 | 115 [795] | 90 [620] | 15 |
Square Welded Pipe
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