SS 904L Seamless Tube, UNS N08904 Pipe Manufacturers in Mumbai
The 904L steel material has a chemical composition with chromium, nickel, manganese, silicon, phosphorus, sulfur and copper. The quantities of these elements differ. We are a Stainless Steel 904L Pipe Manufacturer and we produce all kinds of pipes in this material. The material is non stabilized austenitic steel. Therefore the SS 904L Seamless Tubes are hard but are non magnetic and they could be machined.
904L Stainless Steel Pipe
SS 904L Seamless Tube
UNS N08904 ERW Pipe
904L Stainless Steel Tubing
UNS N08904 Round Tube
SS 904L Heat Exchanger Tube
Buy Stainless Steel UNS N08904 Welded Tube, DIN 1.4539 SS Pipes & SS 904L Pipe at best price
They are tough but have excellent formability which is useful in applications where custom forming operations are needed. Some of the high alloy applications started using the low alloy duplex grade steels but the demand for 904L material persists. The UNS N08904 Seamless Pipe is corrosion resistance mostly due to the high amount of nickel in the composition. They are resistance to reducing acids such as the sulfuric acid. This property comes from the addition of copper in the content. We produce different types of pipes in the material. The Great Steel & Metals produces ASTM B673 Stainless Steel 904L Welded Pipe products which are highly weldable and stronger. The WERKSTOFF NR. 1.4539 Erw Pipe that are electric resistance welded are used in high temperature applications. The SS 904L Tube produced by us is of superior quality. We also manufacture other types of tubes such as the ASME SB673 TP904L Stainless Steel ErwTube components. It is mildly resistant to heat but is good against oxidation. Heat treatment is possible on this grade of steel by solution heat treatment. We can offer you with any information regarding these products upon contact
Table of contents
- Specification Schedule Of Stainless Steel 904L Pipe
- Various Types Of 904L SS Pipe
- Dimensions Schedule Of UNS N08904 Seamless Tubing
- Complete Range Of Stainless Steel 904L Tube Material
- ASTM A249 Tp 904L Tube Of Weight Chart
- 904L Stainless Steel ERW Tube Sizes In Nb
- 904L Stainless Steel Pipe Size Chart In Mm
- 904L Stainless Steel Round Tube Price List
- Schedule 40 ASTM A312 UNS N08904 Tubing For Sale
- Schedule 40 ASTM A312 UNS N08904 Tubing Pressure Rating Table
- Chemical Structure Of Stainless Steel 904L Tubes
- Mechanical Properties Table Of Ss 904L Stainless Coiled Tube
- Physical Properties Of SS 904L Heat Exchanger Tube
- Stainless Steel UNS N08904 Welded Pipe Equivalent Chart
- SS 904L Seamless Tube Stock Of Following Manufacturers
Specification Schedule of Stainless Steel 904L Pipe
Stainless Steel Grade 904L Tube Swg & Bwg | 10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg. |
---|---|
Schedule of AISI 904L Stainless Steel Pipe | SCH5, SCH10, SCH10S, SCH20, SCH30, SCH40, SCH40S, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
SAE 904L Stainless Steel Seamless Tube Size | 3.35 mm OD To 101.6 mm OD |
American Standard | AISI, DIN, EN, GB, IS, JIS, ASTM, ASME Pipe |
Sizeof ASTM B673 F904L Stainless Steel Seamless Pipe | 4 to 219mm W. T.: 0.5 to 20mm |
Stainless Steel 904L Grade Welded Pipe Size Chart | 5.0 mm – 1219.2 mm |
Stainless Steel Grade 904L Welded Tube Size | 6.35 mm OD To 152 mm OD |
1.4539 AISI 904L SS Swg & Bwg | 10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg. |
Food Grade 904L Stainless Steel End |
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904L Stainless Steel Pipe Manufacturers |
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904L Stainless Steel Application | Oil Pipe & Tube, Gas Pipe & Tube, Fluid Pipe & Tube, Boiler Pipe & Tube, Heat exchanger Tube |
SS 904L Grade Value Added Service | Draw & Expansion as per required Size & Length, Polish (Electro & Commercial) Annealed & Pickled Bending, Machining Etc. |
SS 904L Specialize in |
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SUS 904L Stainless Steel Tube wall thickness | 0.020″ –0.220″, (special wall thicknesses available) |
904L SS Length | Single Random, Double Random, Standard & Cut length Pipe & Tube |
Stainless Steel UNS N08904 Finish | Polished, AP (Annealed & Pickled), BA (Bright & Annealed), MF |
We can also cut, thread, and groove 904L SS Pipe to meet your specifications. Pipe Dimension ANSI/ ASME B36.19, B36.10, B2.1 |
Various Types Of 904L SS Pipe
Ready stock of 904L Stainless Steel Pipe, 904L stainless steel Round Tube & Schedule 40 ASTM A312 UNS N08904 Tubing

Stainless Steel 904L Grade Seamless Pipe

SS 904L Grade Pipe

AISI 904L Stainless Steel ERW Pipe

SAE 904L Stainless Steel Square Pipe

Stainless Steel 904l SCH 40 Seamless Pipe

JIS SUS904l UNS n08904 ERW Pipe

ASME SA312 Tp904l Box Pipe

904l SS Cold Drawn Seamless tube

Welded Stainless Steel Grade 904L Tubes

Seamless SUS 904L Stainless Steel Tube

1.4539 AISI 904L SS Welded Pipe

ASTM B673 F904L Stainless Steel Round Pipe

ASME SA312 Tp904L Welded Tube

904l Stainless Steel Boiler tube

Stainless Steel 904l Heat Exchanger Tube

Stainless Steel 904l capillary tubing

ASTM A312 Tp904l Hot Finished Tube

Stainless Steel 904l Fabricated Pipe

JIS SUS904l Coiled Tubing

SA312 904l SS Mechanical tube

Stainless Steel 904l Rectangular Pipe

SA 312 Gr 904l Stainless Steel Polished Pipe

UNS n08904 Stainless Steel Exhaust Pipe

Stainless Steel DIN 1.4539 Cold Drawn Seamless Pipe

SS 904l Welded Pipe

Uns n08904 Seamless Pipe

SS WERKSTOFF NR. 1.4539 Pipe

904l Stainless Steel Round Pipe

SS 904l Square Pipe

Din 1.4539 Welded Pipe

En 1.4539 hot finish pipe

SS 904l Cold Rolled pipe
Dimensions Schedule of UNS N08904 Seamless Tubing
Pipe Size (in) |
Diameter (in) mm |
Nominal Thickness (in) mm |
Transverse Areas (in2) mm2 |
Length of Pipe (ft per sq. foot of surface) |
Volume (ft3/ft) |
Weight | Number of Threads per inch of Screw | |||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
External | Internal | External | Internal | Steel | External Surface (ft) |
Internal Surface (ft) |
(lb/ft) | (kg/m) | ||||
1/8 | 0.405 | 0.27 | 0.07 | 0.13 | 0.06 | 0.07 | 9.43 | 14.20 | 0.0004 | 0.24 | 0.36 | 27 |
¼ | 0.540 | 0.36 | 0.09 | 0.23 | 0.10 | 0.13 | 7.07 | 10.49 | 0.0007 | 0.42 | 0.63 | 18 |
3/8 | 0.675 | 0.49 | 0.09 | 0.36 | 0.19 | 0.17 | 5.66 | 7.75 | 0.0013 | 0.57 | 0.84 | 18 |
½ | 0.840 | 0.62 | 0.11 | 0.55 | 0.30 | 0.25 | 4.55 | 6.14 | 0.0021 | 0.85 | 1.26 | 14 |
¾ | 1.050 | 0.82 | 0.11 | 0.87 | 0.53 | 0.33 | 3.64 | 4.64 | 0.0037 | 1.13 | 1.68 | 14 |
1 | 1.315 | 1.05 | 0.13 | 1.36 | 0.86 | 0.49 | 2.90 | 3.64 | 0.0060 | 1.68 | 2.50 | 11 ½ |
1 ¼ | 1.660 | 1.38 | 0.14 | 2.16 | 1.50 | 0.67 | 2.30 | 2.77 | 0.0104 | 2.27 | 3.38 | 11 ½ |
1 ½ | 1.900 | 1.61 | 0.15 | 2.84 | 2.04 | 0.80 | 2.01 | 2.37 | 0.0141 | 2.72 | 4.04 | 11 ½ |
2 | 2.375 | 2.07 | 0.15 | 4.43 | 3.36 | 1.08 | 1.61 | 1.85 | 0.0233 | 3.65 | 5.43 | 11 ½ |
2 ½ | 2.875 | 2.47 | 0.20 | 6.49 | 4.79 | 1.70 | 1.33 | 1.55 | 0.0333 | 5.79 | 8.62 | 8 |
3 | 3.500 | 3.07 | 0.22 | 9.62 | 7.39 | 2.23 | 1.09 | 1.25 | 0.0513 | 7.58 | 11.27 | 8 |
3 ½ | 4.000 | 3.55 | 0.23 | 12.56 | 9.89 | 2.68 | 0.95 | 1.08 | 0.0687 | 9.11 | 13.56 | 8 |
4 | 4.500 | 4.03 | 0.24 | 15.90 | 12.73 | 3.17 | 0.85 | 0.95 | 0.0884 | 10.79 | 16.06 | 8 |
5 | 5.563 | 5.05 | 0.26 | 24.30 | 20.00 | 4.30 | 0.69 | 0.76 | 0.1389 | 14.61 | 21.74 | 8 |
6 | 6.625 | 6.07 | 0.28 | 34.47 | 28.89 | 5.58 | 0.58 | 0.63 | 0.2006 | 18.97 | 28.23 | 8 |
8 | 8.625 | 7.98 | 0.32 | 58.42 | 50.02 | 8.40 | 0.44 | 0.48 | 0.3552 | 28.55 | 42.49 | 8 |
10 | 10.750 | 10.02 | 0.37 | 90.76 | 78.85 | 11.90 | 0.36 | 0.38 | 0.5476 | 40.48 | 60.24 | 8 |
12 | 12.750 | 11.94 | 0.41 | 127.64 | 111.90 | 15.74 | 0.30 | 0.32 | 0.7763 | 53.60 | 79.77 | 8 |
14 | 14.000 | 13.13 | 0.44 | 153.94 | 135.30 | 18.64 | 0.27 | 0.28 | 0.9354 | 63.00 | 93.75 | 8 |
16 | 16.000 | 15.00 | 0.50 | 201.05 | 176.70 | 24.35 | 0.24 | 0.25 | 1.2230 | 78.00 | 116.08 | 8 |
18 | 18.000 | 16.88 | 0.56 | 254.85 | 224.00 | 30.85 | 0.21 | 0.23 | 1.5550 | 105.00 | 156.26 | 8 |
20 | 20.000 | 18.81 | 0.59 | 314.15 | 278.00 | 36.15 | 0.19 | 0.20 | 1.9260 | 123.00 | 183.05 | 8 |
24 | 24.000 | 22.63 | 0.69 | 452.40 | 402.10 | 50.30 | 0.16 | 0.17 | 2.7930 | 171.00 | 254.48 | 8 |
Complete range of Stainless Steel 904L Tube material
SS grade 904L Instrumentation Tubing | SS 904L Seamless Tube |
SS 904L Thin Wall Tube | ASME SA 213 tp 904L Tube |
UNS N08904 Round Tube | ss 904L superheater tube |
Stainless Steel 904L Tube | SS 904L mechanical tube |
Alloy 904L Condenser tube | astm a269 grade tp 904L welded tube |
Schedule 40 ASTM A312 UNS N08904 Tubing | ASME A312 tp 904L pipe |
large diameter 904L stainless steel pipe | Schedule 10 Type 904L stainless steel Tube |
ASTM A249 tp 904L Tube of Weight Chart
Many sizes and wall thickness of ASME A312 tp 904L pipe & SS 904L mechanical tube
Nominal size [inches] | Outside diameter [inches] | Outside diameter [mm] | Wall thickness [inches] | Wall thickness [mm] | Weight [lb/ft] | Weight [kg/m] |
8 | 8,625 | 219,1 | 0,406 | 10,31 | 35,64 | 53,08 |
10 | 10,750 | 273,0 | 0,500 | 12,7 | 54,74 | 81,55 |
12 | 12,750 | 323,8 | 0,562 | 14,27 | 73,15 | 108,96 |
14 | 14,000 | 355,6 | 0,594 | 15,09 | 85,05 | 126,71 |
16 | 16,000 | 406,4 | 0,656 | 16,66 | 107,50 | 160,12 |
18 | 18,000 | 457,0 | 0,750 | 19,05 | 138,17 | 205,74 |
20 | 20,000 | 508,0 | 0,812 | 20,62 | 166,40 | 247,83 |
22 | 22,000 | 559,0 | 0,875 | 22,23 | 197,41 | 294,25 |
24 | 24,000 | 610,0 | 0,969 | 24,61 | 238,35 | 355,26 |
904L Stainless Steel ERW Tube Sizes In Nb
Wall | Sizes ( O.D.) |
---|---|
.010 | 1/16″ , 1/8″ , 3/16″ |
.020 | 1/16″ , 1/8″ , 3/16″ , 1/4″ , 5/16″ , 3/8″ |
.012 | 1/8″ |
.016 | 1/8″ , 3/16″ |
.028 | 1/8″ , 3/16″ , 1/4″ , 5/16″ , 3/8″ , 1/2″ , 3/4″ , 1″ , 1 1/2″ , 2″ |
.035 | 1/8″ , 3/16″ , 1/4″ , 5/16″ , 3/8″ , 7/16″ , 1/2″ , 16″ , 5/8″ , 3/4″ , 7/8″ , 1″ , 1 1/4″ , 1 1/2″ , 1 5/8″ , 2″ , 2 1/4″ |
.049 | 3/16″ , 1/4″ , 5/16″ , 3/8″ , 1/2″ , 16″ , 5/8″ , 3/4″ , 7/8″ , 1″ , 1 1/8″ , 1 1/4″ , 1 1/2″ , 1 5/8″ , 2″ , 2 1/4″ |
.065 | 1/4″ , 5/16″ , 3/8″ , 1/2″ , 16″ , 5/8″ , 3/4″ , 7/8″ , 1″ , 1 1/4″ , 1 1/2″ , 1 5/8″ , 1 3/4″ , 2″ , 2 1/2″ , 3″ |
.083 | 1/4″ , 3/8″ , 1/2″ , 5/8″ , 3/4″ , 7/8″ , 1″ , 1 1/4″ , 1 1/2″ , 1 5/8″ , 1 7/8″ , 2″ , 2 1/2″ ,3″ |
.095 | 1/2″ , 5/8″ , 1″ , 1 1/4″ , 1 1/2″ , 2″ |
.109 | 1/2″ , 3/4″ , 1″ , 1 1/4″ , 1 1/2″ , 2″ |
.120 | 1/2″ , 5/8″ , 3/4″ , 7/8″ , 1″ , 1 1/4″ , 1 1/2″ , 2″ , 2 1/4″ , 2 1/2″ , 3″ |
.125 | 3/4″ , 1″ , 1 1/4″ , 1 1/2″ , 2″ , 3″ , 3 1/4″ |
.134 | 1″ |
.250 | 3″ |
.375 | 3 1/2″ |
904L Stainless Steel Pipe Size Chart In Mm
1/8″ IPS(.405″ O.D.) | 3 1/2″ IPS( 4.000″ O.D.) |
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SCH 40, 80 | SCH 10, 40, 80, 160, XXH |
1/4″ IPS(.540″ O.D.) | 4″ IPS(4.500″ O.D.) |
SCH 10, 40, 80 | SCH 10, 40, 80, 160, XXH |
3/8″ IPS(.675″ O.D.) | 5″ IPS( 5.563″ O.D.) |
SCH 10, 40, 80 | SCH 10, 40, 80, 160, XXH |
1/2″ IPS(.840″ O.D.) | 6″ IPS(6.625″ O.D.) |
SCH 5, 10, 40, 80, 160, XXH | SCH 5, 10, 40, 80, 120, 160, XXH |
3/4″ IPS(1.050″ O.D.) | 8 ” IPS(8.625″ O.D.) |
SCH 10, 40, 80, 160, XXH | SCH 5, 10, 40, 80, 120, 160, XXH |
1″ IPS:(1.315′ O.D.) | 10″ IPS(10.750″ O.D.) |
SCH 5, 10, 40, 80, 160, XXH | SCH 10, 20, 40, 80 (.500), TRUE 80(.500) |
1-1/4″ IPS(1.660″ O.D.) | 12″ IPS(12.750″ O.D.) |
SCH 10, 40, 80, 160, XXH | SCH 10, 20, 40(.375), TRUE40(.406), SCH80(.500) |
1-1/2″ IPS(1.900″ O.D.) | 14″ IPS(14.000″ O.D.) |
SCH 10, 40, 80, 160, XXH | SCH10 (.188), SCH40 (.375) |
2″ IPS(2.375″ O.D.) | 16″ IPS(16.000″ O.D.) |
SCH 10, 40, 80, 160, XXH | SCH10(.188), SCH40(.375) |
2 1/2″ IPS(2.875″ O.D.) | 18″ IPS (18.000″ O.D.) |
SCH 10, 40, 80, 160, XXH | SCH-40 (.375) |
3″ IPS( 3.500″ O.D.) | |
SCH 5, 10, 40, 80, 160, XXH |
904L stainless steel Round Tube Price List
Check ASTM A312 Tp 904L Welded Pipe, 904L SS EFW Pipe & SS grade 904L Instrumentation Tubing Updated price List

183,448 INR
Stainless Steel Pipes : Size - Od : 21.3m, 1/2, Pipe Sch 40s, A312 Gr.tp904l

507,168 INR
Stainless Steel Hot Finished Seamless Pipes Grade 904l Od Not Less Than 42 Mm

220,415 INR
Stainless Steel Seamless Pipes Astm A312 Grade Tp904l Size (33.4mm Od X 2.77mm Thk X 5.2-5.8m Length)

33,950 INR
Stainless Steel Seamless Pipes Astm A312 Grade Tp904l Size (141.3mm Od X 3.4mm Thk X 5.2-5.8m Length)

159,730 INR
Stainless Steel Seamless Pipes / Astm A 312 Grade Tp904l Size(33.40mm Od X 5.95mm Thk X 6000m Length

10,027 INR
U Circular Tube 50.8 S.s904l /satin Finish L=3400 (3 Pcs) Made Of Stainless Steel
Schedule 40 ASTM A312 UNS N08904 Tubing for sale
ASME SA213 Type 904L Seamless Boiler tube | 904L stainless steel Round Tube |
SS 904L Heat Exchanger Tube | 904L stainless steel Exhaust Tube |
ASTM a312 tp 904L Square tube | ASTM A249 tp 904L Tube |
UNS N08904 Seamless Tubing | 1.4539 CDS Tube (Cold Drawn Seamless) |
AISI 904L Tubing | Thin wall stainless 904L tubing |
UNS N08904 Boiler Tube | ss 904L stainless Coiled Tube |
SUS 904L Capillary Tube |
Schedule 40 ASTM A312 UNS N08904 Tubing Pressure Rating Table
SS Pipe Size(inches) | SS Pipe Schedule | Temperature(F) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
100 | 200 | 300 | 400 | 500 | 600 | 650 | 700 | 750 | ||
1″ | 40 | 3048 | 2629 | 2362 | 2171 | 2019 | 1924 | 1867 | 1824 | 1810 |
80 | 4213 | 3634 | 3265 | 3002 | 2791 | 2659 | 2580 | 2528 | 2501 | |
160 | 6140 | 5296 | 4759 | 4375 | 4068 | 3876 | 3761 | 3684 | 3646 | |
1 1/2″ | 40 | 2257 | 1947 | 1750 | 1608 | 1496 | 1425 | 1383 | 1354 | 1340 |
80 | 3182 | 2744 | 2466 | 2267 | 2108 | 2009 | 1949 | 1909 | 1889 | |
160 | 4619 | 3984 | 3580 | 3291 | 3060 | 2916 | 2829 | 2772 | 2743 | |
2″ | 40 | 1902 | 1640 | 1474 | 1355 | 1260 | 1201 | 1165 | 1141 | 1129 |
80 | 2747 | 2369 | 2129 | 1957 | 1820 | 1734 | 1682 | 1648 | 1631 | |
160 | 4499 | 3880 | 3486 | 3205 | 2980 | 2840 | 2755 | 2699 | 2671 | |
3″ | 40 | 1806 | 1558 | 1400 | 1287 | 1196 | 1140 | 1106 | 1084 | 1072 |
80 | 2553 | 2202 | 1979 | 1819 | 1691 | 1612 | 1564 | 1532 | 1516 | |
160 | 3840 | 3312 | 2976 | 2736 | 2544 | 2424 | 2352 | 2304 | 2280 | |
4″ | 40 | 1531 | 1321 | 1187 | 1091 | 1014 | 967 | 938 | 919 | 909 |
80 | 2213 | 1909 | 1715 | 1577 | 1466 | 1397 | 1355 | 1328 | 1314 | |
160 | 3601 | 3106 | 2791 | 2566 | 2386 | 2273 | 2206 | 2161 | 2138 | |
5″ | 40 | 1342 | 1158 | 1040 | 956 | 889 | 847 | 822 | 805 | 797 |
80 | 1981 | 1709 | 1535 | 1411 | 1312 | 1250 | 1213 | 1189 | 1176 | |
160 | 3414 | 2945 | 2646 | 2433 | 2262 | 2155 | 2091 | 2049 | 2027 | |
6 | 40 | 1219 | 1052 | 945 | 869 | 808 | 770 | 747 | 732 | 724 |
80 | 1913 | 1650 | 1483 | 1363 | 1267 | 1208 | 1172 | 1148 | 1136 | |
160 | 3289 | 2836 | 2549 | 2343 | 2179 | 2076 | 2014 | 1973 | 1953 | |
8″ | 40 | 1073 | 926 | 832 | 765 | 711 | 678 | 657 | 644 | 637 |
80 | 1692 | 1459 | 1311 | 1205 | 1121 | 1068 | 1036 | 1015 | 1005 | |
160 | 3175 | 2738 | 2460 | 2262 | 2103 | 2004 | 1944 | 1905 | 1885 | |
10″ | 40 | 974 | 840 | 755 | 694 | 645 | 615 | 596 | 584 | 578 |
80 | 1609 | 1388 | 1247 | 1147 | 1066 | 1016 | 986 | 966 | 56 | |
160 | 3147 | 2714 | 2439 | 2242 | 2085 | 1986 | 1927 | 1880 | 1868 |
Chemical Structure of Stainless Steel 904L Tubes
Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
904L | min. | – | – | – | – | – | 19.0 | 4.00 | 23.00 | 0.10 |
max. | 0.20 | 2.00 | 1.00 | 0.045 | 0.035 | 23.0 | 5.00 | 28.00 | 0.25 |
Mechanical Properties Table of ss 904L stainless Coiled Tube
Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
Rockwell B (HR B) max | Brinell (HB) max | ||||
904L | 490 | 220 | 35 | 70-90 typical | – |
Physical Properties of SS 904L Heat Exchanger Tube
Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) | |||
0-1000C | 0-3150C | 0-5380C | at 1000C | at 5000C | |||||
904L | 8000 | 200 | 15.0 | – | – | 13.0 | – | 500 | 850 |
Stainless Steel UNS N08904 Welded Pipe Equivalent Chart
Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
BS | En | No | Name | ||||
904L | N08904 | 904S13 | X1NiCrMoCu25-20-5 | 1.4539 | – | – | SUS 890L |
SS 904L Seamless Tube Stock of following manufacturers

Kobe make Stainless Steel 904L Tube

Jindal Stainless make ASME SA 213 tp 904L Tube

Sanyo Special Steel make ASME A312 tp 904L pipe

Schoeller Bleckmann make SS 904L Heat Exchanger Tube

Nippon Steel & Sumitomo Metal Make SS 904L Thin Wall Tube

Salzgitter Mannesmann make ss 904L stainless Coiled Tube