Project Description

UNS S31803 (ASTM A789 /ASME SA789) Duplex Stainless-steel Tubes

ASTM A789 / A 789M, ASME SA789 S31803 Duplex Stainless Tubing is for Boilers, Superheaters and Heat Exchangers.

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ASTM A789 /A789M Covers Grades of nominal wall thickness, stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

ASTM A789 /A789M Stainless Steel tubes Grades S31803, S32205, S31500, S32550, S31200, S31260, S32001, S32304, S39274, S32750, S32760, S32900, S32950, S39277, S32520, S32906.

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ASTM A789 /A789M Stainless tubes shall be made by the seamless or welded process with no filler metal added.

Standard: ASTM A789/A789M, ASME SA789

Description Name:

ASTM A789 Duplex steel S31803 tube, ASTM A789 Duplex steel S32205 tube, ASTM A789 Duplex steel S31500 tube, ASTM A789 Duplex steel S32550 tube, ASTM A789 Duplex steel S32750 tube, ASTM A789 Duplex steel S32520 tube, Duplex stainless-steel tube S31803, Duplex stainless-steel tube S32205, Duplex stainless-steel tube S31500, Duplex stainless-steel tube S32550, Duplex stainless-steel tube S32750, Duplex stainless-steel tube S32520

Seamless pipe & Tube Size: 1/2” to 8”

Welded pipe & Tube Size: 6” to 24”

Outer Diameter: 6.0-630mm

Schedules: 10s, 20, 40s, 40, 60, 80s, 80, 100, 120, 140, 160, XXH

Wall Thickness: 1mm to 50mm

UNS DesignationSpecification
S31803ASTM A789/SA789
S32205ASTM A789/SA789
S31500ASTM A789/SA789
S32550ASTM A789/SA789
S32750ASTM A789/SA789
S32950ASTM A789/SA789
S32520ASTM A789/SA789

Shape: Round

Length: Single random length/ Double random length or as customer’s actual request

Max length 25000mm

Referenced Documents:

ASTM Referenced Standards

A 450/A 450M Specification for General requirements for carbon, Ferritic Alloy, and Austenitic alloy steel tubes

A 480/A 480M Specification for general requirements for flat-rolled stainless and heat-resisting steel plate, sheet, and strip

A 941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys

E 527 Practice for numbering metals and alloys (UNS)

Chemical Composition:

UNS
Designation
Composition, %
C
Max
Mn
max
P
max
S
max
Si
max
NiCrMoNCuOthers
S318030.0320.030.0214.5-6.521.0-23.02.5-3.50.08-0.20. . .. . .
S322050.0320.030.0214.5-6.522-233.0-3.50.14-0.20. . .. . .
S315000.031.20-2.000.030.031.40-2.04.3-5.218-192.5-3.00.05-0.10. . .. . .
S325500.041.50.040.0314.5-6.524-272.9-3.90.10-0.251.50-2.50. . .
S312000.0320.0450.0315.5-6.524-261.-2.00.14-0.20. . .. . .
S312600.0310.030.030.755.5-7.524-262.5-3.50.10-0.300.20-0.80W 0.10-0.50
S320010.034.0-6.00.040.0311.0-3.019.5-21.50.60.05-0.171.00 max. . .
S323040.032.50.040.0413.0-5.521.5-24.50.05-0.600.05-0.200.05-0.60. . .
S327500.031.20.0350.020.86.0-8.024-263.0-5.00.24-0.320.50max. . .
S327600.0510.030.0116.0-8.024-263.0-4.00.20-0.300.50-1.00W 0.50-1.00
S329500.0320.0350.010.63.5-5.226-291.0-2.50.15-0.35. . .. . .
S325200.031.50.0350.020.85.5-8.023-253.0-5.00.20-0.350.8. . .

 

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Heat Treatment Requirements

UNS
Designation
TemperatureQuench
S318031870-2010 °F [1020-1100°C]Rapid cooling in air or water
S322051870-2010 °F [1020-1100°C]Rapid cooling in air or water
S315001800-1900 °F [980-1040°C]Rapid cooling in air or water
S325501900 °F [1040°C] minRapid cooling in air or water
S312001920-2010 °F [1050-1100°C]Rapid cooling in water
S312601870-2010 °F [1020-1100°C]Rapid cooling in water
S320011800-1950 °F [982-1066°C]Rapid cooling in air or water
S323041700-1920 °F [925-1050°C]Rapid cooling in air or water
S327501880-2060 °F [1025-1125°C]Rapid cooling in air or water
S327602010-2085 °F [1100-1140°C]Rapid cooling in air or water
S329501820-1880 °F [990-1025°C]Rapid cooling in water
S325201975-2050 °F [1080-1120°C]Rapid cooling in air or water

Tensile Requirements

GradeTensile strength, min, ksi [MPa]Yield strength, min ksi [MPa]Elongation in 2 in., or 50mm, min,%Hardness, Max
Brinell
S3180390 [620]65 [450]25290
S3220595 [655]70 [485]25290
S3150092 [630]64 [440]30290
S32550110 [760]80 [550]15297
S31200100 [690]65 [450]25280
S31260100 [690]65 [450]25290
S3200190 [620]65 [450]25290
S32304100 [690]65 [450]25290
S32750116 [800]80 [550]15310
S32760109 [750]80 [550]25300
S32950100 [690]70 [480]20290
S32520112 [770]80 [550]25310

 

Flange Test (for welded tubes)

—One test shall be made on specimens from one end of one tube from each lot of finished tubes.

Flaring Test

—One test shall be made on specimens from one end of one tube from each lot of finished tubes. The minimum expansion of the inside diameter shall be 10%

Reverse Flattening Test

—For welded tubes, one reverse flattening test shall be made on a specimen from each 1500Ft or 450m of finished tubing.

Hydrostatic or Nondestructive Testing

—Each pipe shall be subjected to the nondestructive electric test or the hydrostatic test, the type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.

—The hydrostatic test shall be in accordance with specification A 450/A 450M, except that in the calculation of the hydrostatic test pressure 64000(441.2) shall be substituted for 32000(220.6).

Markings

Marking prescribed in specification A450/A 450M, The marking shall indicate whether the tubing is seamless or welded.

Note:

  • Mill test certificates will be issued according to EN10204.3
  • All tubes shall be supplied as per applicable ASTM A789 /A789M Specification.

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ASTM A789 S31803 PHOTOS

ASTM A789M UNS 31803 duplex stainless tubes

ASTM A789M UNS 31803 duplex stainless tubes

 

Packing and Marking

  • Packed in bundles or ply wooden box wrapped in plastic, and suitably protected for sea-worthily delivery or as requested.

Packing photos:

ASTM A789M UNS 31803 duplex stainless tubes packages

ASTM A789M UNS 31803 duplex stainless tubes packages

ASTM A789M UNS 31803 duplex stainless tubes wooden cases

ASTM A789M UNS 31803 duplex stainless tubes wooden cases

Standard and Product List

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