Tensile & Yield Strengths for ASTM A266 Forgings at Elevated Temperatures

The Part D of ASME Boiler and Pressure Vessel Code Section II has specified both tensile strengths and yield strengths for all 4 grades of ASTM A266/ ASME SA-266 forgings at elevated temperatures. The tabulated values in the following tables are provided for design calculation purpose.

Tensile strengths at elevated temperatures

Temp.	TS1	Temp.	TS1
-20~100	60.0	700	60.0
200	60.0	750	59.3
300	60.0	800	55.1
400	60.0	850	50.2
500	60.0	900	44.8
600	60.0	950	39.4
650	60.0	1000	34.6

*Table A-1: tensile strength value TS₁, ksi, for ASTM A266 Grade 1 forging at metal temperature, °F, not exceeding.

Temp.	TS2	Temp.	TS2
-20~100	70.0	700	70.0
200	70.0	750	69.1
300	70.0	800	64.3
400	70.0	850	58.6
500	70.0	900	52.3
600	70.0	950	45.9
650	70.0	1000	40.4

*Table A-2: tensile strength value TS₂, ksi, for ASTM A266 Grade 2 forging at metal temperature, °F, not exceeding.

Temp.	TS3	Temp.	TS3
-20~100	75.0	700	75.0
200	75.0	750	74.1
300	75.0	800	68.9
400	75.0	850	62.8
500	75.0	900	56.0
600	75.0	950	49.2
650	75.0	1000	43.2

*Table A-3: tensile strength value TS₃, ksi, for ASTM A266 Grade 3 forging at metal temperature, °F, not exceeding.

Temp.	TS4	Temp.	TS4
-20~100	70.0	700	70.0
200	70.0	750	69.1
300	70.0	800	64.3
400	70.0	850	58.6
500	70.0	900	52.3
600	70.0	950	45.9
650	70.0	1000	40.4

*Table A-4: tensile strength value TS₄, ksi, for ASTM A266 Grade 4 forging at metal temperature, °F, not exceeding.

Yield strengths at elevated temperatures

Temp.	YS1	Temp.	YS1
-20~100	30.0	600	23.0
150	28.2	650	22.2
200	27.5	700	21.5
250	27.0	750	20.8
300	26.5	800	20.1
350	-	850	19.5
400	25.6	900	19.0
450	-	950	18.4
500	24.4	1000	17.8
550	-	-	-

*Table B-1: yield strength value YS₁, ksi, for ASTM A266 Grade 1 forging at metal temperature, °F, not exceeding.

Temp.	YS2	Temp.	YS2
-20~100	36.0	600	27.6
150	33.8	650	26.7
200	33.0	700	25.8
250	32.4	750	24.9
300	31.8	800	24.1
350	-	850	23.4
400	30.8	900	22.8
450	-	950	22.1
500	29.3	1000	21.4
550	-	-	-

*Table B-2: yield strength value YS₂, ksi, for ASTM A266 Grade 2 forging at metal temperature, °F, not exceeding.

Temp.	YS3	Temp.	YS3
-20~100	37.5	600	28.7
150	35.2	650	27.8
200	34.4	700	26.9
250	33.7	750	26.0
300	33.2	800	25.1
350	-	850	24.4
400	32.0	900	23.7
450	-	950	23.0
500	30.6	1000	22.3
550	-	-	-

*Table B-3: yield strength value YS₃, ksi, for ASTM A266 Grade 3 forging at metal temperature, °F, not exceeding.

Temp.	YS4	Temp.	YS4
-20~100	36.0	600	27.6
150	33.8	650	26.7
200	33.0	700	25.8
250	32.4	750	24.9
300	31.8	800	24.1
350	-	850	23.4
400	30.8	900	22.8
450	-	950	22.1
500	29.3	1000	21.4
550	-	-	-

*Table B-4: yield strength value YS₄, ksi, for ASTM A266 Grade 4 forging at metal temperature, °F, not exceeding.