What is ASTM A790?
ASTM A790 is a standard specification for seamless and weldable ferritic/austenitic stainless steel pipe. ASTM A790 pipes are manufactured using seamless or automated welding processes without the addition of filler metal during welding. Thermal analysis is performed to determine the percentages of specified elements. To meet the specified requirements, tensile tests, hardening tests, flattening tests, hydrostatic tests, and non-destructive electrical tests are required.
What is the grade of material for ASTM A789 Duplex Steel?
| Standard Item |
ASTM A789 | ASTM A790 | EN 10216-5 | |||
| Grade | S31803 S32205 S32750 | S31803 S32205 S32750 | 1.4301 1.4307 1.4948 1.4315 1.4401 1.4404 1.4571 1.4541 1.4941 1.4845 1.4449 1.4438 1.4550 1.4912 1.4462 1.4410 |
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| UNS | |||||||||||
| Designation | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu | Others |
| S31803 | 0.030 | 2.00 | 0.030 | 0.020 | 1.00 | 4.5–6.5 | 21.0–23.0 | 2.5–3.5 | 0.08–0.20 | . . . | . . . |
| S32205 | 0.030 | 2.00 | 0.030 | 0.020 | 1.00 | 4.5–6.5 | 22.0–23.0 | 3.0–3.5 | 0.14–0.20 | . . . | . . . |
| S32550 | 0.04 | 1.50 | 0.040 | 0.030 | 1.00 | 4.5–6.5 | 24.0–27.0 | 2.9–3.9 | 0.10–0.25 | 1.50 –2.50 |
. . . |
| S32707 | 0.030 | 1.50 | 0.035 | 0.010 | 0.50 | 5.5–9.5 | 26.0–29.0 | 4.0–5.0 | 0.30–0.50 | 1.0 max | Co 0.5 –2.0 |
| S32750 | 0.030 | 1.20 | 0.035 | 0.020 | 0.80 | 6.0–8.0 | 24.0–26.0 | 3.0–5.0 | 0.24–0.32 | 0.50 | . . . |
| S32760 | 0.030 | 1.00 | 0.030 | 0.010 | 1.00 | 6.0–8.0 | 24.0–26.0 | 3.0–4.0 | 0.20–0.30 | 0.50 –1.00 |
W 0.50 –1.00 |
A Maximum, unless a range or minimum is indicated. Where ellipses (…) appear in this table, there is no minimum and analysis for the element need not be determined or reported.
B Designation established in accordance with Practice E527 and SAE J1086.
C % Cr + 3.3 × % Mo + 16 × % N $ 41.
D % Cr + 3.3 × % Mo + 16 × % N $ 40.
| 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 |
| 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 A789 Duplex Steel O.D. Tolerance
| O.D. Tolerance (mm) |
O.D. | O.D.Tolerance | O.D. | O.D.Tolerance | O.D. Tolerance Class | |
| D<12.7 | +/-0.13 | 10.3≤D≤48.3 | +0.40/-0.80 | D3 | +/-0.75% or +/-0.3mm |
|
| 12.7≤D<38.1 | +/-0.13 | 48.3<D≤114.3 | +0.80/-0.80 | |||
| whichever is the greater | ||||||
| 38.1≤D<88.9 | +/-0.25 | 114.3<D≤219.1 | +1.60/-0.80 | D4 | +/-0.5% or +/-0.1mm |
|
| 88.9≤D<139.7 | +/-0.38 | 219.1<D≤457.0 | +2.40/-0.80 | |||
| whichever is the greater | ||||||
ASTM A789 Duplex Steel W.T. Tolerance
| W.T. Tolerance (mm) |
O.D. | W.T.Tolerance | O.D. | W.T.Tolerance | W.T. Tolerance Class | |
| D<12.7 | +/-15% | 10.3≤D≤73.0 | +20.0%/-12.5% | T3 | +/-10% or +/-0.2mm |
|
| 12.7≤D<38.1 | +/-10% | |||||
| 88.9≤D≤457.0 t/D ≤5% |
+22.5%/-12.5% | whichever is the greater | ||||
| 38.1≤D<88.9 | +/-10% | T4 | +/-7.5% or +/-0.15mm |
|||
| 88.9≤D≤457.0 t/D >5% |
+15.0%/-12.5% | |||||
| 88.9≤D<139.7 | +/-10% | |||||
| whichever is the greater | ||||||
| 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 |
| 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 |
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