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[China]
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Contact name:Jikin Cai
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ASME SA249 / ASTM A249 Stainless Steel Welded Tubes, bright annealed , Plain End , TP304, TP304L, TP304H
A 249 / SA 249
Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
1.1 This specification covers nominal-wall-thickness welded tubes
made from the austenitic steels listed in Table 1, with various
grades intended for such use as boiler, superheater, heat
exchanger, or condenser tubes.
1.2 Grades TP304H, TP309H, TP309HCb, TP310H, TO310HCb, TP316H,
TP321H, TP347H, and TP348H are modifications of Grades TP304,
TP309S, TP309Cb, TP310S, TP310Cb, TP316, TP321, TP347, and TP348,
and are intended for high-temperature service such as for
superheaters and reheaters.
1.3 The tubing sizes and thicknesses usually furnished to this
specification are 1/8 in. [3.2 mm] in inside diameter to 5 in. [127
mm] in outside diameter and 0.015 to 0.320 in. [0.4 to 8.1 mm],
inclusive, in wall thickness. Tubing having other dimensions may be
furnished, provided such tubes comply with all other requirements
of this specification.
1.4 Mechanical property requirements do not apply to tubing
smaller than 1/8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4
mm] in thickness.
1.5 Optional supplementary requirements are provided and, when
one or more of these are desired, each shall be so stated in the
order.
1.6 The values stated in either inch-pound units or SI units are
to be regarded separately as standard. (A combination of values
from the two systems may result in nonconformance with the
specification.) The inch-pound units shall apply unless the "M"
designation of this specification is specified in the order.
Chemical Composition:
Elements | 304L(wt%) | 316L (wt%) |
| ||
(C) Carbon, max | 0.035 | 0.035 |
(Mn) Manganese, max | 2.00 | 2.00 |
(P) Phosphorus, max | 0.040 | 0.040 |
(S) Sulfur, max | 0.030 | 0.030 |
(Si) Silicon, max | 0.75 | 0.75 |
(Ni) Nickel | 8.0 - 13.0 | 10.0 - 15.0 |
(Cr) Chromium | 18.0 - 20.0 | 16.0 - 18.0 |
(Mo) Molybdenum | N/A | 2.0 - 3.0 |
(Fe) Iron | Bal. | Bal. |
(Cu) Copper | N/A | N/A |
(N) Nitrogen | N/A | N/A |
Dimensional Tolerences
all dimensions in inches (mm)
Size OD | Nominal Wall | Outside Diameter | Length | Wall |
| ||||
1/2" (12.7) | 0.065" (1.65)/0.049" (1.25) | +/-0.005 (0.13) | +1/8" (3.18) - 0 | +/-10.0% |
3/4" (19.1) | 0.065" (1.65)/0.049" (1.25) | +/-0.005 (0.13) | +1/8" (3.18) - 0 | +/-10.0% |
1" (25.4) | 0.065" (1.65)/0.049" (1.25) | +/-0.005 (0.13) | +1/8" (3.18) - 0 | +/-10.0% |
1-1/2" (38.1) | 0.065" (1.65)/0.049" (1.25) | +/-0.008" (0.20) | +1/8" (3.18) - 0 | +/-10.0% |
2" (50.8) | 0.065" (1.65)/0.049" (1.25) | +/-0.008" (0.20) | +1/8" (3.18) - 0 | +/-10.0% |
2-1/2" (63.5) | 0.065" (1.65) | +/-0.010" (0.25) | +1/8" (3.18) - 0 | +/-10.0% |
3" (76.2) | 0.065" (1.65) | +/-0.010" (0.25) | +1/8" (3.18) - 0 | +/-10.0% |
4" (101.6) | 0.083" (2.11) | +/-0.015" (0.38) | +1/8" (3.18) - 0 | +/-10.0% |
6" (152.4) | 0.083" (2.11) | +/-0.030" (0.76) | +1" (25.4) - 0 | +/-10.0% |
6" (152.4) | 0.109" (2.77) | +/-0.030" (0.76) | +1" (25.4) - 0 | +/-10.0% |
8" (203.2) | 0.109" (2.77) | +0.061" (1.55)/-0.031" (0.79) | +1" (25.4) - 0 | +/-10.0% |
To ensure the highest surface quality in all of our sanitary tubing,Yuhong Special Steel goes beyond
the requirements of ASTM A269 and A270 by performing the full battery of ASTM bend and deformation
tests required by ASME SA249 as well as additional deformation tests developed by Yuhong Special
Steel The tests, combined with specific raw material requirements, Eddy Current testing at the tube mill,
and tighter OD and wall tolerances allow Yuhong Special Steel to provide a more consistent superior
quality product.Hydrogen bright annealed in line to 1900°F (1040°C) minimum and rapidly
quenched.Surface finish is 20 μ-in Ra (0.5 μm) ID maximum, 30 μ-in Ra (0.8 μm) OD maximum surface
roughness measured per ASME/ ANSI B46.1 with the profilometer reading at 90 degrees to major polishing
pattern.Yuhong Special Steel’s polishing techniques result in surface finishes that lead the industry. All
tubing is printed with size, gauge, alloy, ASTM and ASME specifications, heat number and date of
manufacturing for full traceability.As a final step in maintaining purity standards, Yuhong Special Steel’s
A270 S2 tubing is packaged using protective 2 mil poly sleeving along with air tight plastic end caps. The
tubing is then placed in triple wall boxes for maximum protection during shipment. Other packaging is
available on request.
