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SA 516 (Vacuum Degassed / TUF 37)

Overview

TUF 37 is produced to very stringent specification to achieve a reasonable assurance of maximum resistance to notch toughness sensitivity, sulfide stress corrosion cracking, and hydrogen induced cracking. All heats are produced by the electric furnace process; vacuum degassed, and calcium / argon treated during meting for sulfide shape control; and poured by the continuous cast process to yield an extra clean steel. TUF 37 is produced to a fine grain practice in accordance to ASME Specifications SA 516. Normal range for the CEQ is .37 – .40.

Chemical Requirements

*Elements represented in percentage

Elements Composition %
Grade 55
(Grade 380)
Composition %
Grade 60
(Grade 415)
Composition %
Grade 65
(Grade 450)
Composition %
Grade 70
(Grade 485)
Carbon, max
1/2 in. (12.5 mm) and under 0.18 0.21 0.24 0.27
Over 1/2 to 2 in. (12.5 to 50 mm), incl 0.20 0.23 0.26 0.28
Over 2 to 4 in. (50 to 100 mm), incl 0.22 0.25 0.28 0.30
Over 4 to 8 in. (100 to 200 mm), incl 0.24 0.27 0.29 0.31
Over 8 in. (200 mm) 0.26 0.27 0.29 0.31
Manganese, max
1/2 (12.5) and under:
Heat analysis 0.60-0.90 0.60-0.90 0.85-1.20 0.85-1.20
Product analysis 0.55-0.98 0.55-0.98 0.79-1.30 0.79-1.30
Over 1/2 (12.5) and under:
Heat analysis 0.60-1.20 0.85-1.20 0.85-1.20 0.85-1.20
Product analysis 0.55-1.30 0.79-1.30 0.79-1.30 0.79-1.30
Phosphorus, max  0.010 0.010 0.010 0.010
Sulfur, max  0.002 0.002 0.002 0.002
Silicon
Heat analysis 0.15-0.40 0.15-0.40 0.15-0.40 0.15-0.40
 Product analysis 0.13-0.45 0.13-0.45 0.13-0.45 0.13-0.45

Tensile Requirements

Grade 55
(Grade 380)
Grade 60
(Grade 415)
Grade 65
(Grade 450)
Grade 70
(Grade 485)
Tensile strength, ksi (MPa) 55-75(380-515) 60-80(415-550) 65-85(450-585) 70-90(485-620)
Yield strength, min. ksi (MPa) 30(205) 32(220) 35(240) 38(260)
Elongation in 8 in. (200 mm), min, % 23 21 19 17
Elongation in 2 in. (50 mm), min, % 27 25 23 21
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