ASTM B668 Alloy 28 Tubing

ASTM B668 - 14

ASTM B668 is a Standard Specification for UNS N08028 and N08029 Seamless Pipe and Tube

ASTM B668 specification covers the standard requirements for UNS N08028 seamless cold-finished or hot-finished pipe and tube intended for general corrosive services. The pipe and tube shall be furnished in the solution-annealed condition and heat treated at a certain range of temperature by subsequent quenching in water or rapidly cooling by other means. Chemical and product analysis shall be conducted on each lot of material as described in a referenced ASTM document and shall conform to the required chemical composition for carbon, silicon, manganese, phosphorus, sulfur, chromium, nickel, molybdenum, copper, and iron. ASTM B668 material shall also be subjected to tension test, flaring test, and hydrostatic or nondestructive test to determine its mechanical properties which shall be in conformity with the tensile strength, yield strength, and elongation requirements.
Table of contents

ASTM B668 Alloy 28 Tube Specification

Tube and pipe ASTM B 668, SEW 400 (Feb 1991), EN 10216-5, SS 14 25 84, NFA 49-217
UNS N08028 ALLOY 28 Tubes Size 15 NB to 150 NB IN
ASTM B668 UNS N08028 Tubing Wall Thickness .035" -.095', (special wall thicknesses available)
Specialized in Large Diameter Size
ALLOY UNS N08028 Tubing Type Seamless / ERW / Welded / Fabricated / Hollow
INCOLOY ALLOY 28 Tubes Schedule SCH5, SCH10, SCH40, STD, SCH80, SCH160
SB 668 UNS N08028 Tubes Condition Hot-Finished, Annealed, Cold-Drawn, Polished, AP (Annealed & Pickled), BA (Bright & Annealed), MF
NICKEL ALLOY 28 Tubes Form Straight, Rectangular, Capillary, Hydraulic, Round, Heat-Exchanger, Square, U-Tube, Boiler, Condenser, Coiled
SANICRO 28 UNS N08028 Tubes Length Single Random, Double Random & Cut Length.
End Plain End, Beveled End, Treaded.
Marking All Alloy DIN 1.4563 Pipes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or according to the customer’s request.)
Material Test Certificates (MTC) Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2
Export Network
  • Malaysia
  • Houston, Texas
  • Dubai, UAE
  • Edmonton, Canada
  • Sheffield, England
  • Singapore
ASTM B668 UNS N08028 Alloy 28 Tubing manufacturers
  • Sumitomo Metals, Japan
  • Nippon Steel Corporation, Japan
  • Kobe Special Tube, Japan
  • Sanyo Special Steel, Japan
  • Tubacex Tubos Inoxidables S.A., Spain
  • Schoeller Bleckmann, Austria
  • Seah Steel Corporation, Korea
We can also cut, thread, and groove ASTM B668 UNS N08028 Tubes to meet your specifications.

UNS N08028 ALLOY 28 Seamless Tube

Outside diameter Wall thickness Length
5.0 ~ 203.2mm As per requirement Upto 6 Meters

ASTM B668 UNS N08028 Welded Tube

Outside diameter Wall thickness Length
5.0 ~ 1219.2mm 1.0 ~ 15.0 mm Upto 6 Meters

Value Added services:

ASTM B668 UNS N08028 Alloy 28 Tubing services

ALLOY UNS N08028 Tube Types

ASTM B668 Alloy 28 Gas Tube Ar 15 supplier
ASTM B668 Alloy 28 Gas Tube Ar 15
UNS N08028 ALLOY 28 Bourdon Tube Stockist
UNS N08028 ALLOY 28 Bourdon Tube
ASTM B668 UNS N08028 Capillary Tube
ASTM B668 UNS N08028 Capillary Tube
ALLOY UNS N08028 Furnace Tube
ALLOY UNS N08028 Furnace Tube
INCOLOY ALLOY 28 Gas Tube
INCOLOY ALLOY 28 Gas Tube
SB 668 UNS N08028 Heat Exchanger Tubes
SB 668 UNS N08028 Heat Exchanger Tubes
NICKEL ALLOY 28 Mortar Tube
NICKEL ALLOY 28 Mortar Tube
SANICRO 28 UNS N08028 Radiant Tube
SANICRO 28 UNS N08028 Radiant Tube
Alloy DIN 1.4563 Square Tube
Alloy DIN 1.4563 Square Tube

INCOLOY ALLOY 28 Tube Nominal Tube Wall Thickness & Dimensions

UNS N08028 ALLOY 28 Tubes
(O.D.)		 ASTM B668 UNS N08028 Tube Gauge
BWG 00 BWG 0 BWG 1 BWG 2 BWG 3 BWG 4 BWG 5 BWG 6 BWG 7 BWG 8 BWG 9 BWG 10 BWG 11 BWG 12 BWG 13 BWG 14 BWG 15 BWG 16 BWG 17 BWG 18 BWG 19 BWG 20 BWG 21 BWG 22 BWG 23 BWG 24
ASTM B668 Alloy 28 Tubing Wall Thickness (Inches)
0.380 0.340 0.300 0.284 0.259 0.238 0.220 0.203 0.180 0.165 0.148 0.134 0.120 0.109 0.095 0.083 0.072 0.065 0.058 0.049 0.042 0.035 0.032 0.028 0.025 0.022
ALLOY UNS N08028 Tubes Inside Dia
1/4"  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A 0.010 0.032 0.060 0.084 0.106 0.120 0.134 0.152 0.166 0.180 0.186 0.194 0.200 0.206
3/8"  N/A  N/A  N/A  N/A  N/A  N/A  N/A  N/A 0.015 0.045 0.079 0.107 0.135 0.157 0.185 0.209 0.231 0.245 0.259 0.277 0.291 0.305 0.311 0.319 0.325 0.331
1/2"  N/A  N/A  N/A  N/A  N/A 0.024 0.060 0.094 0.140 0.170 0.204 0.232 0.260 0.282 0.310 0.334 0.356 0.370 0.384 0.402 0.416 0.430 0.436 0.444 0.450 0.456
5/8"  N/A  N/A 0.025 0.057 0.107 0.149 0.185 0.219 0.265 0.295 0.329 0.357 0.385 0.407 0.435 0.459 0.481 0.495 0.509 0.527 0.541 0.555 0.561 0.569 0.575 0.581
3/4"  N/A 0.070 0.150 0.182 0.232 0.274 0.310 0.344 0.390 0.420 0.454 0.482 0.510 0.532 0.560 0.584 0.606 0.620 0.634 0.652 0.666 0.680 0.686 0.694 0.700 0.706
7/8" 0.115 0.195 0.275 0.307 0.357 0.399 0.435 0.469 0.515 0.545 0.579 0.607 0.635 0.657 0.685 0.709 0.731 0.745 0.759 0.777 0.791 0.805 0.811 0.819 0.825 0.831
1" 0.240 0.320 0.400 0.432 0.482 0.524 0.560 0.594 0.640 0.670 0.704 0.732 0.760 0.782 0.810 0.834 0.856 0.870 0.884 0.902 0.916 0.930 0.936 0.944 0.950 0.956
1 1/8" 0.365 0.445 0.525 0.557 0.607 0.649 0.685 0.719 0.765 0.795 0.829 0.857 0.885 0.907 0.935 0.959 0.981 0.995 1.009 1.027 1.041 1.055 1.061 1.069 1.075 1.081
1 1/4" 0.490 0.570 0.650 0.682 0.732 0.774 0.810 0.844 0.890 0.920 0.954 0.982 1.010 1.032 1.060 1.084 1.106 1.120 1.134 1.152 1.166 1.180 1.186 1.194 1.200 1.206
1 1/2" 0.740 0.820 0.900 0.932 0.982 1.024 1.060 1.094 1.140 1.170 1.204 1.232 1.260 1.282 1.310 1.334 1.356 1.370 1.384 1.402 1.416 1.430 1.436 1.444 1.450 1.456
1 3/4" 0.990 1.070 1.150 1.182 1.232 1.274 1.310 1.344 1.390 1.420 1.454 1.482 1.510 1.532 1.560 1.584 1.606 1.620 1.634 1.652 1.666 1.680 1.686 1.694 1.700 1.706
2" 1.240 1.320 1.400 1.432 1.482 1.524 1.560 1.594 1.640 1.670 1.704 1.732 1.760 1.782 1.810 1.834 1.856 1.870 1.884 1.902 1.916 1.930 1.936 1.944 1.950 1.956
2 1/4" 1.490 1.570 1.650 1.682 1.732 1.774 1.810 1.844 1.890 1.920 1.954 1.982 2.010 2.032 2.060 2.084 2.106 2.120 2.134 2.152 2.166 2.180 2.186 2.194 2.200 2.206
2 1/2" 1.740 1.820 1.900 1.932 1.982 2.024 2.060 2.094 2.140 2.170 2.204 2.232 2.260 2.282 2.310 2.334 2.356 2.370 2.384 2.402 2.416 2.430 2.436 2.444 2.450 2.456
2 3/4" 1.990 2.070 2.150 2.182 2.232 2.274 2.310 2.344 2.390 2.420 2.454 2.482 2.510 2.532 2.560 2.584 2.606 2.620 2.634 2.652 2.666 2.680 2.686 2.694 2.700 2.706
3" 2.240 2.320 2.400 2.432 2.482 2.524 2.560 2.594 2.640 2.670 2.704 2.732 2.760 2.782 2.810 2.834 2.856 2.870 2.884 2.902 2.916 2.930 2.936 2.944 2.950 2.956
3 1/4" 2.490 2.570 2.650 2.682 2.732 2.774 2.810 2.844 2.890 2.920 2.954 2.982 3.010 3.032 3.060 3.084 3.106 3.120 3.134 3.152 3.166 3.180 3.186 3.194 3.200 3.206
3 1/2" 2.740 2.820 2.900 2.932 2.982 3.024 3.060 3.094 3.140 3.170 3.204 3.232 3.260 3.282 3.310 3.334 3.356 3.370 3.384 3.402 3.416 3.430 3.436 3.444 3.450 3.456
3 3/4" 2.990 3.070 3.150 3.182 3.232 3.274 3.310 3.344 3.390 3.420 3.454 3.482 3.510 3.532 3.560 3.584 3.606 3.620 3.634 3.652 3.666 3.680 3.686 3.694 3.700 3.706
4" 3.240 3.320 3.400 3.432 3.482 3.524 3.560 3.594 3.640 3.670 3.704 3.732 3.760 3.782 3.810 3.834 3.856 3.870 3.884 3.902 3.916 3.930 3.936 3.944 3.950 3.956
4 1/4" 3.490 3.570 3.650 3.682 3.732 3.774 3.810 3.844 3.890 3.920 3.954 3.982 4.010 4.032 4.060 4.084 4.106 4.120 4.134 4.152 4.166 4.180 4.186 4.194 4.200 4.206
4 1/2" 3.740 3.820 3.900 3.932 3.982 4.024 4.060 4.094 4.140 4.170 4.204 4.232 4.260 4.282 4.310 4.334 4.356 4.370 4.384 4.402 4.416 4.430 4.436 4.444 4.450 4.456
4 3/4" 3.990 4.070 4.150 4.182 4.232 4.274 4.310 4.344 4.390 4.420 4.454 4.482 4.510 4.532 4.560 4.584 4.606 4.620 4.634 4.652 4.666 4.680 4.686 4.694 4.700 4.706
5" 4.240 4.320 4.400 4.432 4.482 4.524 4.560 4.594 4.640 4.670 4.704 4.732 4.760 4.782 4.810 4.834 4.856 4.870 4.884 4.902 4.916 4.930 4.936 4.944 4.950 4.956
5 1/4" 4.490 4.570 4.650 4.682 4.732 4.774 4.810 4.844 4.890 4.920 4.954 4.982 5.010 5.032 5.060 5.084 5.106 5.120 5.134 5.152 5.166 5.180 5.186 5.194 5.200 5.206

SB 668 UNS N08028 Hydraulic Tube Burst Pressure

(Barlow’s Formula)

P = (2ST÷D) (45,000 PSI Min Tensile Stress)
P = Burst Pressure
S = 45,000 lbs. PSI Tensile Strength
T = Nominal Wall Thickness
D = OD/ Outside Diameter

1/4" x 0.035 - 12,600 5/8" x 0.083 - 11,950 1-1/8" x 0.065 - 5,200
1/4 x 0.049 - 17,640 3/4 x 0.035 - 4,200 1-1/8" x 0.083 - 6,640
5/16" x 0.035 - 10,080 3/4" x 0.049 - 5,880 1-1/8 x 0.95 - 7,600
5/16 x 0.049 - 14,110 3/4 x 0.065 - 7,800 1-1/8 x 0.109 - 8,720
3/8" x 0.035 - 8,400 3/4" x 0.083 - 9,960 1-1/4" x 0.065 - 4,680
3/8 x 0.049 - 11,760 3/4 x 0.095 - 11,400 1-1/4 x 0.083 - 5,975
3/8" x 0.065 - 15,600 3/4" x 0.109 - 13,080 1-1/4 x 0.095 - 6,840
7/16 x 0.035 - 7,200 7/8 x 0.049 - 5,040 1-1/4" x 0.109 - 7,848
7/16" x 0.049 - 10,080 7/8" x 0.065 - 6,685 1-1/4 x 0.120 - 8,640
7/16 x 0.065 - 13,370 7/8 x 0.083 - 8,535 1-1/2" x 0.083 - 4,980
1/2" x 0.035 -  6,300 7/8" x 0.095 - 9,770 1-1/2 x 0.095 - 5,700
1/2 x 0.049 -  8,820 1" x 0.049 - 4,410 1-1/2" x 0.109 - 6,540
1/2" x 0.065 - 11,700 1" x 0.065 - 5,850 1-1/2 x 0.120 - 7,200
5/8 x 0.035 -  5,040 1" x 0.083 - 7,470 2" x 0.134 - 6,030
5/8" x 0.049 -  7,055 1" x 0.095 - 8,550 2" x 0.188 - 8,460
5/8 x 0.065 -  9,360

Note: To compute safe working pressures, above Burst Pressures should be divided by your desired safety factor.

NICKEL ALLOY 28 Tubing Chemical Composition


C		 Si Mn P S Cr Ni Mo Cu Fe
Min • • • • • 26.00 30.00 3.00 0.06 0.00
Max 0.03 1.00 2.50 0.030 0.030 28.00 34.00 4.00 1.40 0.00

SANICRO 28 UNS N08028 Tubes Mechanical Properties

Material Tensile Strength MPa Yield Strength (0.2% Offset) MPa Elongation (%)
Alloy 28 Tube 650 250 40

Condition: UNS N08028 Annealed

U.T.S 73 KSI Min
0.2% Proof Stress 31 KSI Min
Elongation 40 %

Condition: UNS N08028 Cold Worked

U.T.S 120 KSI Min
0.2% Proof Stress 90 KSI Min
Elongation 5 %

Alloy DIN 1.4563 Tube Equivalent Grades

Material No. 1.4563
UNS N 08028
N symbol (short) X1NiCrMoCu31-27-4
AFNOR X1NiCrMoCu31-27-4 / (EN 10088-1(062005) (F)
BS X1NiCrMoCu31-27-4 / (EN 10088-1(062005) (GB)
Other Trade Name Nicrofer® 3127 LC
Sanicro 28 (Spec)

ASTM B668 DIN 1.4563 Seamless Tube Price in India

  • ASTM B668 Alloy 28 Seamless Tube
    $20.00-$30.00/ Kilogram
  • UNS N08028 ALLOY 28 Seamless Tube
    $28,000.00-$43,000.00/ Ton
  • ASTM B668 UNS N08028 nickel alloy seamless pipe tube price
    $30.00-$35.00/ Kilogram
  • SB 668 UNS N08028 INCOLOY ALLOY 28 seamless pipe / tube
    $24.00-$28.00/ Kilogram