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ASTM A268 TP446 tube

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What is ASTM A268 TP446 tube?

TP446 has higher modulus and thus lighter walls can be used without vibration issues. The ASTM A268 TP446 Tube is ferritic stainless steel alloy which is non-heat treatable. They are known for offering good resistance to oxidation, corrosion, and high temperature. The 446 Stainless Steel Tube is easily weldable using traditional methods except the oxyacetylene welding.

The tube comes with increased cr content and hence are tough to bend, draw and weld. They are suitably used within the temperature range of 1500-2100°F but their high temperature strength is quite low. They show high steam and water droplet resistance which offers a great cushioning for extensive conditions.

AISI 446 cold drawn seamless tube and 446 stainless steel seamless tubing manufacturer in India

ASTM A268 TP446 tube manufacturer in India

How do you know if a 446 stainless steel tube is seamless or welded?

The ASTM A268 TP446 Seamless Tubes comes without any welded seam. They are stronger and offer good leakage proofing. They are also more expensive than the welded tubes. The SA268 TP446 Welded Tubes comes with welded seams. The seams might be present longitudinally and the tubes are welded using a wide range of techniques.

Supplier of SS 446 tubing in Gujarat, we export UNS S44600 ERW tube with test certificates such as mill test, raw material test

ASTM A268 TP446 Tube

ASTM A268 TP446 Tube

446 Stainless Steel Tube

446 Stainless Steel Tube

SS 446 Tubing

SS 446 Tubing

Which method is used to produce stainless steel 446 seamless thick walled tubes?

The thick wall SS 446 Tubing is manufactured by hot working process called roll piercing. Herein, a round stock gets center drilled at the ends and two rolls apply compressive forces.

Our 446 stainless steel tube and ASTM A268 TP446 seamless tube stock can be custom cut to required lengths for you at no additional charge

Table of Contents


ASTM A268 TP446 tube manufacturer

Specifications of ASTM A268 TP446 tube

Size Thickness End
10.29 OD (mm) – 762 OD (mm) 0.35 OD (mm) to 6.35 OD (mm) Plain , Beveled , Treaded
Type Dimension Standard External Coating
Seamless / ERW / Welded  ANSI B36.19, ANSI B36.10 3LPE / 3LPP/ FBE/ DFBE/ PP
For quality assurance buy 446 SS coil tubing and SA268 TP446 welded tube stock with NDT inspection reports

Types of 446 stainless steel tube

ASTM A268 TP446 Seamless Tube

ASTM A268 TP446 Seamless Tube

SA268 TP446 Welded Tube

SA268 TP446 Welded Tube

446 SS Coil Tubing

446 SS Coil Tubing

Stainless Steel 446 Condenser Tube

Stainless Steel 446 Condenser Tube

Type 446 Heater Tubes

Type 446 Heater Tubes

WNR 1.4762 Heat Exchanger Tubes

WNR 1.4762 Heat Exchanger Tubes

UNS S44600 ERW Tubes

UNS S44600 ERW Tubes

AISI 446 Cold Drawn Seamless Tubes

AISI 446 Cold Drawn Seamless Tubes

SS 446 Tube

SS 446 Tube

Stainless steel 446 condenser tube and Type 446 heater tubes are usually preferred for low-pressure and low-temperature services

Chemical composition of ASTM A268 TP446 seamless tubes

Grade C Si Mn P Cr S Mo N Ni
446 min. – – – – 23.0 – – 0.10 –
max. 0.2 0.75 1.5 0.040 30.0 0.030 – 0.25 0.50

SA268 TP446 welded tubes mechanical properties

Grade Yield Strength 0.2% Proof min (MPa)/td> Tensile Strength min Elongation (% in 50 milimeter) min Hardness
Rockwell B (HR B) max Brinell (HB) max
446 275 485 20 92 201

446 SS coil tubing equivalent

Grade UNS Number Euronorm Old British Swedish SS Japanese JIS
No Name BS En
446 S44600 1.4762 / 1.4763 – – – – –

Stainless steel 446 condenser tube physical properties

Grade 446
Mean Coefficient of Thermal Expansion (m/m/0C) 0-1000C 9.9
0-3150C 11.4
0-5380C 11.6
Specific Heat 0-1000C (J/kg.K) 460
Density (kg/m3) 7500
Elastic Modulus (GPa) 200
Thermal Conductivity (W/m.K) at 1000C 24.9
at 5000C 28.7
Electrical Resistivity (n.m) 570

Type 446 heater tubes creep properties

1% Elongation1) for Rupture2) for
Temperature °C 1,000 h N/mm2 10,000 h N/mm2 1,000 h N/mm2 10,000 h N/mm2 100,000 h N/mm2
500 80 50 160 100 55
600 27.5 17.5 55 35 20
700 8.5 4.7 17 9.5 5
800 3.7 2.1 7.5 4.3 2.3
900 1.8 1.0 3.6 1.9 1.0

Wnr 1.4762 heat exchanger tubes tolerance

OD Tolerance
4mm to 35mm +/- 0.08mm
35mm to 38mm +/- 0.15mm
38mm to 60mm +/- 0.20mm
60mm and above +/- 0.25mm

Dimension of SS 446 tubing

Size (in) Transverse Areas (in2) mm2 Length of tubes (ft per sq. foot of surface) Diameter (in) mm Nominal Thickness (in) mm Number of Threads per inch of Screw Volume (ft3/ft) Weight
External Internal Steel External Surface (ft) Internal Surface (ft) External Internal (lb/ft) (kg/m)
1/8 0.13 0.06 0.07 9.43 14.20 0.405 0.27 0.07 27 0.0004 0.24 0.36
¼ 0.23 0.10 0.13 7.07 10.49 0.540 0.36 0.09 18 0.0007 0.42 0.63
3/8 0.36 0.19 0.17 5.66 7.75 0.675 0.49 0.09 18 0.0013 0.57 0.84
½ 0.55 0.30 0.25 4.55 6.14 0.840 0.62 0.11 14 0.0021 0.85 1.26
¾ 0.87 0.53 0.33 3.64 4.64 1.050 0.82 0.11 14 0.0037 1.13 1.68
1 1.36 0.86 0.49 2.90 3.64 1.315 1.05 0.13 11 ½ 0.0060 1.68 2.50
1 ¼ 2.16 1.50 0.67 2.30 2.77 1.660 1.38 0.14 11 ½ 0.0104 2.27 3.38
1 ½ 2.84 2.04 0.80 2.01 2.37 1.900 1.61 0.15 11 ½ 0.0141 2.72 4.04
2 4.43 3.36 1.08 1.61 1.85 2.375 2.07 0.15 11 ½ 0.0233 3.65 5.43
2 ½ 6.49 4.79 1.70 1.33 1.55 2.875 2.47 0.20 8 0.0333 5.79 8.62
3 9.62 7.39 2.23 1.09 1.25 3.500 3.07 0.22 8 0.0513 7.58 11.27
3 ½ 12.56 9.89 2.68 0.95 1.08 4.000 3.55 0.23 8 0.0687 9.11 13.56
4 15.90 12.73 3.17 0.85 0.95 4.500 4.03 0.24 8 0.0884 10.79 16.06
5 24.30 20.00 4.30 0.69 0.76 5.563 5.05 0.26 8 0.1389 14.61 21.74
6 34.47 28.89 5.58 0.58 0.63 6.625 6.07 0.28 8 0.2006 18.97 28.23
8 58.42 50.02 8.40 0.44 0.48 8.625 7.98 0.32 8 0.3552 28.55 42.49
10 90.76 78.85 11.90 0.36 0.38 10.750 10.02 0.37 8 0.5476 40.48 60.24
12 127.64 111.90 15.74 0.30 0.32 12.750 11.94 0.41 8 0.7763 53.60 79.77
14 153.94 135.30 18.64 0.27 0.28 14.000 13.13 0.44 8 0.9354 63.00 93.75
16 201.05 176.70 24.35 0.24 0.25 16.000 15.00 0.50 8 1.2230 78.00 116.08
18 254.85 224.00 30.85 0.21 0.23 18.000 16.88 0.56 8 1.5550 105.00 156.26
20 314.15 278.00 36.15 0.19 0.20 20.000 18.81 0.59 8 1.9260 123.00 183.05
24 452.40 402.10 50.30 0.16 0.17 24.000 22.63 0.69 8 2.7930 171.00 254.48

UNS S44600 ERW tubes surface finish

Surface Finish Exterbal Surface(OD) Internal Surface(ID)
Roughness Average(RA) Roughness Average(RA)
μ inch μm μ inch μm
AP Annealed & Pickled 40 or Not defined 1.0 or Not defined Not defined Not defined
BA Beight Annealed 32 0.8 40,32,25,20 1.0,0.8,0.6,0.5
MP Mechanical Polish 32 0.8 40,32,25,20 1.0,0.8,0.6,0.5
EP Electro Polish 32 0.8 15,10,7,5 0.38,0.25,0.20;0.13

SS 446 tube sizes

WT mm OD mm in. Sch Kg/meter
1.65 13.72 1/4 10S 0.50
2.24 13.72 1/4 40S 0.64
3.02 13.72 1/4 80S 0.81
1.65 17.15 3/8 10S 0.64
2.31 17.15 3/8 40S 0.86
3.20 17.15 3/8 80S 1.12
2.11 21.34 1/2 10S 1.02
2.77 21.34 1/2 40S 1.29
3.73 21.34 1/2 80S 1.65
2.11 26.67 3/4 10S 1.30
2.87 26.67 3/4 40S 1.71
3.91 26.67 3/4 80S 2.23
2.77 33.40 1 10S 2.13
3.38 33.40 1 40S 2.54
4.55 33.40 1 80S 3.29
6.352) 33.40 1 160 4.30
2.77 42.16 1¼ 10S 2.73
3.56 42.16 1¼ 40S 3.44
4.85 42.16 1¼ 80S 4.53
6.352) 42.16 1¼ 160 5.69
2.77 48.26 1½ 10S 3.16
3.68 48.26 1½ 40S 4.11
5.08 48.26 1½ 80S 5.49
2.77 60.33 2 10S 3.99
3.91 60.33 2 40S 5.52
5.54 60.33 2 80S 7.60
8.742) 60.33 2 160 11.29
3.05 73.03 2½ 10S 5.35
5.16 73.03 2½ 40S 8.77
7.01 73.03 2½ 80S 11.59
3.05 88.90 3 10S 6.56
5.49 88.90 3 40S 11.47
7.62 88.90 3 80S 15.51
11.132) 88.90 3 160 21.67
3.05 101.60 3½ 10S 7.53
5.74 101.60 3½ 40S 13.78
8.08 101.60 3½ 80S 18.92
3.05 114.30 4 10S 8.50
6.02 114.30 4 40S 16.32
8.56 114.30 4 80S 22.67
13.492) 114.30 4 160 34.05
6.55 141.30 5 40S 22.10
9.53 141.30 5 80S 31.44
15.882) 141.30 5 160 49.87
3.4 168.28 6 10S 14.04
7.11 168.28 6 40S 28.69
10.97 168.28 6 80S 43.21
14.27 168.28 6 120 54.75
18.262) 168.28 6 160 68.59
8.18 219.08 8 40S 43.20
12.7 219.08 8 80S 65.63
18.23 219.08 8 120 91.30
23.012) 219.08 8 160 112.97

What is SA268 TP446 hydraulic tubes?

The hydraulic UNS S44600 ERW Tubes are manufactured for the aerospace industries. They can be found in the airframes and engines of both military as well as commercial aircraft. The thin-walled ones are used for actuating flight controlling surfaces like flaps and slats.

These hydraulic tubes are also found in the brakes and landing gears of the airplane. The AISI 446 Cold Drawn Seamless Tubes for hydraulic applications are capable of bearing heavy aerodynamics . They are a critical component for the overall safety of the aircraft as they possess high strength to weight ratio.