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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 nickel-alloy steel plates

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
ElementGr. AGr. BGr. DGr. E & F
C
max
t≤2"0.170.210.170.20
2"< t ≤4"0.200.240.200.23
t>4"0.230.25
Mn
max
*H.A.
t≤2"
0.700.700.700.70
*H.A.
t>2"
0.800.800.800.80
*P.A.
t≤2"
0.780.780.780.78
*P.A.
t>2"
0.880.880.880.88
Pmax0.0250.0250.0250.025
Smax0.0250.0250.0250.025
Si*H.A.0.15–0.400.15–0.400.15–0.400.15–0.40
*P.A.0.13–0.450.13–0.450.13–0.450.13–0.45
Ni*H.A.2.10-2.502.10-2.503.25-3.753.25-3.75
*P.A.2.03-2.572.03-2.573.18-3.823.18-3.82
*t: plate thickness; *H.A.: heat analysis; *P.A.: product analysis; unit: %.

Mechanical Properties

ASTM A203Grade A & DGrade B & EGrade 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]1917
*EL. 2"
min. %
[50mm]232120
*T.S.: tensile strength; *Y.S.: yield strength; *EL. 8″: elongation in 8″; *EL. 2″: elongation in 2″.

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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