TP304H Stainless steel seamless pipe, also known as 1.4948 stainless steel seamless pipe, is an austenitic stainless steel pipe. It has excellent heat resistance in raised temperatures.
ASTM A312 TP304H pipe are widely used in pipeline construction, oil and chemical industry, nuclear technology, and boiler making industry. The increased carbon content delivers a greater tensile and yield strength.
The austenitic structure of TP304H stainless steel also gives it excellent toughness, even down to cryogenic temperatures. We supply and manufacture this pipe with a wide range of sizes, from 10.0mm to 1219mm.
The wall thickness of TP304H stainless steel seamless pipe ranges from 1mm to 50 mm. The common length of each pipe is 5.8m, 6.0m, 11.8m. The maximum length we produce is up to 11.8m.
TP304H Stainless Steel Seamless Pipe is the most common product, which can be cut to size and pipe with polished finish is also available. A lot of processing services, including punching, painting, beveling, chamfering are all available for us.
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Specification of 304H Stainless Steel Seamless Pipe |
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Size |
OD: 6 ~ 406.4mm; WT: 1 ~ 50mm; O.D.:1/8”-16” ;W.T.:SCH 10(S)- XXS Length: as client requirement, Max.11.8m |
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Process |
Seamless, Cold Drawn, Cold Rolled, |
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Different Name |
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End |
PE(Plain End), BE(Beveled End), |
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Surface |
Aid Pickling, Polishing, |
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Standard |
ASTM A312, ASTM A213, EN10216-5, DIN 17456, DIN 17458, JIS G3459, JIS G3463,ASTM 269 |
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Theoretical Weight(kg/m) |
Weight/meter = (OD-WT)*WT*0.02491 Both OD and WT in mm. |
Note:
OD is the specified outside diameter.
WT is the specified wall thickness
Stainless steel pipes shall be pickled free of scale. When bright annealing is used, pickling is not necessary.
Plain ends cut and deburred will be furnished. If threaded ends or ends beveled for welding are desired, give details.
Chemical Composition
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Element |
UNS S30409(304H) |
Tolerances, % |
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C, max |
0.04 to 0.10 |
±0.01 |
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Mn, max |
2.00 |
±0.04 |
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P, max |
0.045 |
±0.005 |
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S, max |
0.030 |
±0.003 |
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Si, max |
1.00 |
±0.05 |
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Ni |
8.0 to 11.0 |
±0.15 |
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Cr |
18.0 to 20.0 |
±0.20 |
Mechanical Properties
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Alloy |
Temper |
Tensile Strength |
Yield Strength, 0.2% |
Elongation in2 in. or |
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UNS S30409 |
Solution Annealed |
515 |
205 |
35 |
Tolerances in Wall Thickness
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NPS Designator |
Tolerance, % from Nominal |
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Over |
Under |
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1/8 to 2-1/2 incl., all t/D ratios |
20 |
12.5 |
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3 to 18 inch., t/D up to 5% incl. |
22.5 |
12.5 |
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3 to 18 inch., t/D＞5% |
15 |
12.5 |
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20 and larger, welded, all t/D ratios |
17.5 |
12.5 |
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20 and larger, seamless, t/D up to 5% incl. |
22.5 |
12.5 |
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20 and larger, seamless, t/D＞5% |
15 |
12.5 |
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Note: t = Nominal Wall Thickness; D = Ordered Outside Diameter
Tolerances in Outside Diameter
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NPS Designator |
Tolerances in Outside Diameter |
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Over |
Under |
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in. |
mm |
in. |
mm |
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1/8 to 1-1/2, incl |
1/64 (0.015) |
0.4 |
1/32 (0.031) |
0.8 |
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Over 1-1/2 to 4, incl |
1/32 (0.031) |
0.8 |
1/32 (0.031) |
0.8 |
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Over 4 to 8, incl |
1/16 (0.062) |
1.6 |
1/32 (0.031) |
0.8 |
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Over 8 to 18, incl |
3/32 (0.093) |
2.4 |
1/32 (0.031) |
0.8 |
Straightness Tolerances
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Specified OD, in. |
Specified Wall Thickness, in. |
Maximum Curvature in any 3ft, in. |
Maximum Curvature i Total Length, in. |
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Up to 5.0 incl. |
Over 3% OD to 0.5, incl. |
0.03 |
0.010 x length, ft |
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Over 5.0 to 8.0, incl. |
Over 4% OD to 0.75, incl. |
0.045 |
0.015 x length, ft |
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Over 8.0 to 12.75, incl. |
Over 4% OD to 1.0, incl. |
0.06 |
0.020 x length, ft |
Tests of 304H Stainless Steel Seamless Pipe
1.Chemical Analysis (ASTM E345)
2.Mechanical Properties (Tension: ASTM E8)
3.Nondestructive Test
3.1:100% ET
3.2:According to ASTM A450/A450M
4,PMI
Packing Information
wooden case
Bundle package