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Carbon Steel Pressure Vessel Plates for Moderate and Lower Temperature Service
 

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.

 

 Download TUF-37 PDF (32 KB)

Chemical Requirements

ElementsComposition %
Grade 55
(Grade 380)
Composition %
Grade 60
(Grade 415)
Composition %
Grade 65
(Grade 450)
Composition %
Grade 70
(Grade 485)
Carbon, maxA        
    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 analysisB 0.60-0.90 0.60-0.90 0.85-1.20 0.85-1.20
    Product analysisB 0.55-0.98 0.55-0.98 0.79-1.30 0.79-1.20
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 A 0.035 0.035 0.035 0.035
Sulfur, max A 0.04 0.04 0.04 0.04
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

AApplies to both heat and product analysis
BGrade 60 plates 1/2 in. (12.5 mm) and under in thickness may have 0.85-1.20% manganese on heat analysis and 0.79-1.30% manganese on product analysis.

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.B ksi (MPa) 30(205) 32(220) 35(240) 38(260)
Elongation in 8 in. (200 mm), min, % 23A 21A 19A 17A
Elongation in 2 in. (50 mm), min, % 27A 25A 23A 21A

ASee Specification A 20/A 20M.
BDetermined by either the 0.2% offset method or the 0.5% extension-under-load method.