ASTM A204 Plates Applied to ASME BPVC

August 27, 2020

Applicability & Temperature Limits

The molybdenum alloy steel (C-0.5Mo) pressure vessel plates made in accordance with ASTM A204/ ASME SA-204 can be furnished in three grades: Grade A (UNS K11820), Grade B (UNS K12020), Grade C (K12320), with same P number of 3. All three grades of ASTM A204 can be applied to ASME Boiler & Pressure Vessel Code Section I, III, VIII-1, and XII, with maximum temperature limits of 538°C, 371°C, 538°C, 343°C, respectively.

Maximum Allowable Stress – Temperature of ASTM A204 Gr. A

Temp.	S
40	128
65	128
100	128
125	128
150	128
200	128
250	128
300	128
325	128
350	128
375	128
400	128
425	127
450	124
475	105
500	68.9
525	42.8
550	23.2

*S: maximum allowable stress, MPa, for Metal Temperature Temp., °C, not exceeding.

Maximum Allowable Stress – Temperature of ASTM A204 Gr. B

Temp.	S
40	138
65	138
100	138
125	138
150	138
200	138
250	138
300	138
325	138
350	138
375	138
400	138
425	137
450	134
475	107
500	68.1
525	43.1
550	23.1

*S: maximum allowable stress, MPa, for Metal Temperature Temp., °C, not exceeding.

Maximum Allowable Stress – Temperature of ASTM A204 Gr. C

Temp.	S
40	148
65	148
100	148
125	148
150	148
200	148
250	148
300	148
325	148
350	148
375	148
400	148
425	148
450	144
475	109
500	67.2
525	43.3
550	23.0

*S: maximum allowable stress, MPa, for Metal Temperature Temp., °C, not exceeding.

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