ASTM A789 Duplex Stainless steel Tubes
ASTM A789/A789M-05
Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
ASTM A789 Alloy 2205 UNS S32205/S31803 Seamless Tubes, is a 22% chromium, 3% molybdenum, 5-6% nickel, nitrogen alloyed Duplex Stainless Steel Pipe with high general, localized, and stress corrosion resistance properties in addition to high strength and excellent impact toughness.
ASTM A789 ASME SA 789 Seamless Tubes Features
- Superior resistance to general and local corrosion, especially to stress corrosion, pitting corrosion, crevice corrosion, corrosion fatigue and abrasion & corrosion.
- Good weldability
- Good mechanical properties
- Excellent intergranular corrosion resistance
- High cost-effectiveness, long life time
ASTM A789 Duplex Stainless steel Tubes Chemical Composition:
| UNS Designation |
Composition, % | ||||||||||
| C Max |
Mn max |
P max |
S max |
Si max |
Ni | Cr | Mo | N | Cu | Others | |
| S31803 | 0.03 | 2 | 0.03 | 0.02 | 1 | 4.5-6.5 | 21.0-23.0 | 2.5-3.5 | 0.08-0.20 | . . . | . . . |
| S32205 | 0.03 | 2 | 0.03 | 0.02 | 1 | 4.5-6.5 | 22-23 | 3.0-3.5 | 0.14-0.20 | . . . | . . . |
| S31500 | 0.03 | 1.20-2.00 | 0.03 | 0.03 | 1.40-2.0 | 4.3-5.2 | 18-19 | 2.5-3.0 | 0.05-0.10 | . . . | . . . |
| S32550 | 0.04 | 1.5 | 0.04 | 0.03 | 1 | 4.5-6.5 | 24-27 | 2.9-3.9 | 0.10-0.25 | 1.50-2.50 | . . . |
| S31200 | 0.03 | 2 | 0.045 | 0.03 | 1 | 5.5-6.5 | 24-26 | 1.-2.0 | 0.14-0.20 | . . . | . . . |
| S31260 | 0.03 | 1 | 0.03 | 0.03 | 0.75 | 5.5-7.5 | 24-26 | 2.5-3.5 | 0.10-0.30 | 0.20-0.80 | W 0.10-0.50 |
| S32001 | 0.03 | 4.0-6.0 | 0.04 | 0.03 | 1 | 1.0-3.0 | 19.5-21.5 | 0.6 | 0.05-0.17 | 1.00 max | . . . |
| S32304 | 0.03 | 2.5 | 0.04 | 0.04 | 1 | 3.0-5.5 | 21.5-24.5 | 0.05-0.60 | 0.05-0.20 | 0.05-0.60 | . . . |
| S32750 | 0.03 | 1.2 | 0.035 | 0.02 | 0.8 | 6.0-8.0 | 24-26 | 3.0-5.0 | 0.24-0.32 | 0.50max | . . . |
| S32760 | 0.05 | 1 | 0.03 | 0.01 | 1 | 6.0-8.0 | 24-26 | 3.0-4.0 | 0.20-0.30 | 0.50-1.00 | W 0.50-1.00 |
| S32950 | 0.03 | 2 | 0.035 | 0.01 | 0.6 | 3.5-5.2 | 26-29 | 1.0-2.5 | 0.15-0.35 | . . . | . . . |
| S32520 | 0.03 | 1.5 | 0.035 | 0.02 | 0.8 | 5.5-8.0 | 23-25 | 3.0-5.0 | 0.20-0.35 | 0.8 | . . . |
Heat Treatment Requirements
| UNS Designation | Temperature | Quench |
| S31803 | 1870-2010 °F [1020-1100°C] | Rapid cooling in air or water |
| S32205 | 1870-2010 °F [1020-1100°C] | Rapid cooling in air or water |
| S31500 | 1800-1900 °F [980-1040°C] | Rapid cooling in air or water |
| S32550 | 1900 °F [1040°C] min | Rapid cooling in air or water |
| S31200 | 1920-2010 °F [1050-1100°C] | Rapid cooling in water |
| S31260 | 1870-2010 °F [1020-1100°C] | Rapid cooling in water |
| S32001 | 1800-1950 °F [982-1066°C] | Rapid cooling in air or water |
| S32304 | 1700-1920 °F [925-1050°C] | Rapid cooling in air or water |
| S32750 | 1880-2060 °F [1025-1125°C] | Rapid cooling in air or water |
| S32760 | 2010-2085 °F [1100-1140°C] | Rapid cooling in air or water |
| S32950 | 1820-1880 °F [990-1025°C] | Rapid cooling in water |
| S32520 | 1975-2050 °F [1080-1120°C] | Rapid cooling in air or water |
Mechanical behavior Tensile Requirements
| Grade | Tensile strength, min, ksi [MPa] | Yield strength, min ksi [MPa] | Elongation in 2 in., or 50mm, min,% | Hardness, Max Brinell |
| S31803 | 90 [620] | 65 [450] | 25 | 290 |
| S32205 | 95 [655] | 70 [485] | 25 | 290 |
| S31500 | 92 [630] | 64 [440] | 30 | 290 |
| S32550 | 110 [760] | 80 [550] | 15 | 297 |
| S31200 | 100 [690] | 65 [450] | 25 | 280 |
| S31260 | 100 [690] | 65 [450] | 25 | 290 |
| S32001 | 90 [620] | 65 [450] | 25 | 290 |
| S32304 | 100 [690] | 65 [450] | 25 | 290 |
| S32750 | 116 [800] | 80 [550] | 15 | 310 |
| S32760 | 109 [750] | 80 [550] | 25 | 300 |
| S32950 | 100 [690] | 70 [480] | 20 | 290 |
| S32520 | 112 [770] | 80 [550] | 25 | 310 |
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)
ASTM A789 UNS S31803 Test
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.
ASME SA 789 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).
Note:
Mill test certificates will be issued according to EN10204.3
All tubes shall be supplied as per applicable ASTM A789 /A789M Specification.
