ASTM A333 / A333M

ASTM A333 is a standard specification for seamless and welded carbon and alloy steel pipe intended for use at low temperature and in applications requiring notch toughness. This specification covers requirements such as chemical composition, mechanical properties, heat treatment, and notch impact test for these low temperature ferritic steel pipes. Ferrobend stocks and supply grade 1, grade 3, grade 4, grade 6, grade 7, grade 9, grade 10 and grade 11 to ASTM A333 specification.

ASTM A333 Pipe Grades

Descriptions Types
Carbon & Alloy Steel Grade 1
Grade 3
Grade 4
Grade 6
Grade 7
Grade 8
Grade 9
Grade 10
Grade 11

Chemical Properties

Element Grade 1 Grade 3 Grade 4 Grade 6 Grade 7 Grade 8 Grade 9 Grade 10 Grade 11
Carbon, max 0.30 0.19 0.12 0.30 0.19 0.13 0.20 0.20 0.10
Manganese 0.40–1.06A 0.31–0.64 0.50–1.05 0.29–1.06A 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 0.40 max 2.03–2.57 8.40–9.60 1.60–2.24 0.25 max 35.0–37.0
Chromium - - 0.44–1.01 0.30 max - - - 0.15 max 0.50 max
Copper - - 0.40–0.75 0.40 max - - 0.75–1.25 0.15 max -
Aluminum - - 0.04–0.30   - - - 0.06 max -
Vanadium, max - - - 0.08 - - - 0.12 -
Columbium, max - - - 0.02C - - - 0.05 -
Molybdenum, max - - - 0.12 - - - 0.05 0.05 max
Cobalt - - - - - - - - 0.05 max
Note: A For each reduction of 0.01 % carbon below 0.30 %, an increase of 0.05 % manganese above 1.06 % would be permitted to a maximum of 1.35 % manganese.
C By agreement between the manufacturer and the purchaser, the limit for columbium may be increased up to 0.05 % on heat analysis and 0.06 % on product analysis.

Mechanical Properties

Grades Tensile strength, min, psi [MPa] Yield strength, min, psi [MPa] Elongation in 2 in. or 50 mm
Basic minimum elongation proportionally
smaller size test 		For longitudinal strips tests
Longitudinal Transverse Longitudinal Transverse Longitudinal Transverse
psi MPa psi MPa psi MPa
Grade 1 psi 55 000 30 [205] 35 25 28 20 1.75B 1.25B
MPa 30 000 205
Grade 3 psi 65 000 35 000 30 20 22 14 1.50B 1.00B
MPa 450 240
Grade 4 psi 60 000 35 000 30 16.5 22 12 1.50B 1.00B
MPa 415 240
Grade 6 psi 60 000 35 000 30 16.5 22 12 1.50B 1.00B
MPa 415 240
Grade 7 psi 65 000 35 000 30 22 22 14 1.50B 1.00B
MPa 450 240
Grade 8 psi 100 000 75 000 22 - 16 - 1.25B -
MPa 690 515
Grade 9 psi 63 000 46 000 28 - - - 1.50B -
MPa 435 315
Grade 10 psi 80 000 65 000 22 - 16 - 1.25B -
MPa 550 450
Grade 11 psi 65 000 35 000 18A - - - - -
MPa 450 240
Note: A Elongation of Grade 11 is for all walls and small sizes tested in full section. BB The calculated minimum values.

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