SA553 Type I in the standard SA553/SA553M is a kind ofNi alloy steel plates materialused to fabric high temperature pressure vessels, the composition of Ni is 8% and 9%.

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SA553 Type I in the standard SA553/SA553M is a kind ofNi alloy steel plates materialused to fabric high temperature pressure vessels, the composition of Ni is 8% and 9%. SA553 have two types . They are : type I and type II . SA553 Type I need to be done the (Quenching + Tempering ) heat-treatment to meet the property requirement in the standard ASME SA553/SA553M.

ASME SA553 Type I steel chemical composition(%):S

Composition		Type I
C≤	Heat analyse	0.13
	Product analyse
Mn ≤	Heat analyse	0.90
	Product analyse	0.98
S ≤ P ≤	Heat analyse	0.035
	Product analyse
Si	Heat analyse	0.15~0.40
	Product analyse	0.13~0.45
Ni ≤	Heat analyse	8.50~9.50
	Product analyse	8.40~9.60

ASME SA553 Type I Mechanical Properties:

Grade

Tensile Strength
ksi (Mpa)

Yield Strength
ksi (Mpa)

Elongation in 2 in , 50 mm,min,(%)

SA553

100-120

(690-825)

(585)

ASME SA553 Type I Delivery Condition:
Normalizing/Tempering/Annealing/Quenching/QT and so on. (According to the customer's request of chemical composition and mechanical properties.)

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Boiler Pressure Vessel Steel