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» Base Material » ASTM A203 Nickel-Alloy Steel Plates
ASTM A203 Nickel-Alloy Steel Plates
December 18, 2019
ASTM A203/ A203, is the standard specification covers nickel-alloy steel paltes intended primarily for welded pressure vessels. These nickel alloy steels are mainly used for moderate- or low-temperature services. The nickel content added imparts significant improvements in fracture toughness and fatigue resistance of the steel.
ASTM A203 Grade A plates.
Plates under this specification are available with four strength levels and two nickel compositions: Grade A, Grade B, Grade D, Grade E and Grade F. The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements. In engineering practice, Grade A and B are usually referred to as “2% nickel steel“; Grade D, E & F are usually referred to as “3% nickel steel“.
| ASTM A203 Nickel-Alloy Steel Plates | |||||
|---|---|---|---|---|---|
| Element | Gr. A | Gr. B | Gr. D | Gr. E & F | |
| C max | t≤2" | 0.17 | 0.21 | 0.17 | 0.20 |
| 2"< t ≤4" | 0.20 | 0.24 | 0.20 | 0.23 | |
| t>4" | 0.23 | 0.25 | … | … | |
| Mn max | *H.A. t≤2" | 0.70 | 0.70 | 0.70 | 0.70 |
| *H.A. t>2" | 0.80 | 0.80 | 0.80 | 0.80 | |
| *P.A. t≤2" | 0.78 | 0.78 | 0.78 | 0.78 | |
| *P.A. t>2" | 0.88 | 0.88 | 0.88 | 0.88 | |
| P | max | 0.025 | 0.025 | 0.025 | 0.025 |
| S | max | 0.025 | 0.025 | 0.025 | 0.025 |
| Si | *H.A. | 0.15–0.40 | 0.15–0.40 | 0.15–0.40 | 0.15–0.40 |
| *P.A. | 0.13–0.45 | 0.13–0.45 | 0.13–0.45 | 0.13–0.45 | |
| Ni | *H.A. | 2.10-2.50 | 2.10-2.50 | 3.25-3.75 | 3.25-3.75 |
| *P.A. | 2.03-2.57 | 2.03-2.57 | 3.18-3.82 | 3.18-3.82 | |
Mechanical Properties
| ASTM A203 | Grade A & D | Grade B & E | Grade F | |
|---|---|---|---|---|
| *T.S. ksi [MPa] | t≤2" | 65-85 [450-585] | 70-90 [485-620] | 80-100 [550-690] |
| t＞2" | 65-85 [450-585] | 70-90 [485-620] | 75-95 [515-655] |
|
| *Y.S. ksi [MPa] | t≤2" | ≥37 [≥255] | ≥40 [≥275] | ≥55 [≥380] |
| t＞2" | ≥37 [≥255] | ≥40 [≥275] | ≥50 [≥345] |
|
| *EL. 8" min. % | [200mm] | 19 | 17 | … |
| *EL. 2" min. % | [50mm] | 23 | 21 | 20 |
Manufacture, Heat Treatment & Testing
The ASTM A203 steel shall be killed and shall conform to the fine grain size requirement of specification ASTM A20/ A20M. All plates of Grade A, B, D, and E shall be normalized except that approved by the purchaser for Grade A, B, D and E, cooling rates faster than air cooling are permissible for improvement of the toughness, provided the plates sre subsequently tempered at not less than 1100°F [595°C] for not less than 0.5 hours. All plates of Grade F shall be heat treated by heating into the austenitic range, quenching in water, and tempering at not less than 1100°F [595°C] for not less than 0.5 hours.
The inspection and testing required for ASTM A203 nickel-alloy steel plates include: chemical analysis, tension test, Charpy V-Notch impact test, drop weight test, high-temperature tension test, ultrasonic examination, as well as magnetic particle examination.
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