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Standard: ASME SA 333  American society of mechanical engineers; ASTM A333M American society for Testing and Materials.
Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service

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Description

Grade 1 Grade 3 Grade 4 Grade 6 Grade 7 Grade 8 Grade 9 Grade 10 Grade 11
Carbon, max 0.3 0.19 0.12 0.3 0.19 0.13 0.2 0.2 0.1
Manganese 0.40–1.06 0.31–0.64 0.50–1.05 0.29–1.06 0.90 max 0.90 max 0.40–1.06 1.15–1.50 0.60 max
Phosphorus, max 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.035 0.025
Sulfur, max 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.015 0.025
Silicon 0.18–0.37 0.08–0.37 0.10 min 0.13–0.32 0.13–0.32 0.10–0.35 0.35 max
Nickel 3.18–3.82 0.47–0.98 2.03–2.57 8.40–9.60 1.60–2.24 0.25 max 35.0–37.0
Chromium 0.44–1.01 0.15 max 0.50 max
Copper 0.40–0.75 0.15 max 0.50 max
Aluminum 0.04–0.30 0.06 max
Vanadium, max 0.12
Columbium, max 0.05
Molybdenum, max 0.05 0.50 max
Cobalt 0.50 max

Mechanical Properties:

Grade 1 Grade 3 Grade 4 Grade 6 Grade 7 Grade 8 Grade 9 Grade 10 Grade 11
psi MPa psi MPa psi MPa psi MPa psi MPa psi MPa psi MPa psi MPa psi MPa
Tensile strength min 55 000 380 65 000 450 60 000 415 60 000 415 65 000 450 100 000 690 63 000 435 80 000 550 65 000 450
Yield strength min 30 000 205 35 000 240 35 000 240 35 000 240 35 000 240 75 000 515 46 000 315 65 000 450 35 000 240