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ASTM A204 steel
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ASTM A204 steel

ASTM A204 steel

ASTM A204 is a standard for pressure vessel with molybdenum alloy plates. The standard ASTM A204 includes three grades ASTM A204GrA, ASTM A204GrB, ASTM A204GrC. For ASTM A204 GrA steel plate, the max thickness is 150mm and for A204 GrB steel plate, the max thickness is 150mm, while for A204 GrC steel plate, the max thickness is 100mm.

A204GrA, A204GrB, A204GrC steel plate chemical composition:

Standard Grade Thickkness Chemical composition %
mm C Mn Si P S Mo
ASTM A204 A204 GrA ≤25 ≤0.18 ≤0.98 0.13-0.45 ≤0.035 ≤0.035 0.41-0.64
>25-50 ≤0.21
>50-100 ≤0.23
>100 ≤0.25
A204 GrB ≤25 ≤0.20 ≤0.98 0.13-0.45 ≤0.035 ≤0.035 0.41-0.64
>25-50 ≤0.23
>50-100 ≤0.25
>100 ≤0.27
A204 GrC ≤25 ≤0.23 ≤0.98 0.13-0.45 ≤0.035 ≤0.035 0.41-0.64
>25-50 ≤0.26
>50-100 ≤0.28
>100 ≤0.28

A204GrA, A204GrB, A204GrC steel plate mechanical properties:

Standard Grade Yield strength
min
Tensile strength Elongation %
min
Mpa Mpa T=200mm T=50mm
ASTM A204 A204 GrA 255 450-585 19 23
A204 GrB 275 485-620 17 21
A204 GrC 295 515-655 16 20

A204GrA, A204GrB, A204GrC steel plate supplementary requirements:

Other main additional technical requirements from customers :

S1. Vacuum Treatment

S2. Product Analysis

S3. Simulated Post-Weld Heat Treatment

S4. Additional Tension Test

S5.Charpy V-Notch Impact Test

S6.Drop Weight Test

S7.High-Temperature Tension Test

S8. Ultrasonic Examination in accordance with - A 435/A 435M

S9.Magnetic Particle Examination

S11.Ultrasonic Examination in accordance with A 577/A 577M

S12.Ultrasonic Examination in accordance with A 578/A 578M

S17.vacuum carbon deoxidized steel

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