ASTM A333, Seamless and Welded Steel Pipe for Low-Temperature Service

ASTM A333 is the Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service.

ASTM A333 Pipe

shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. ASTM A333 Frequently used name: killed carbon steel

ASTM A333 standard covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. ASTM A333 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. All seamless and welded pipes shall be treated to control their microstructure. Tensile tests, impact tests, hydrostatic tests, and nondestructive electric tests shall be made in accordance to specified requirements.

Scope of ASTM A333

  • This specification covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. Several grades of ferritic steel are included as listed in Table 1. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
  • Supplementary Requirement S1 of an optional nature is provided. This shall apply only when specified by the purchaser.
  • The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.
  • Note 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter”, “size”, and “nominal size”.

Mainly Grade of ASTM A333:

Strike temperature condition:

Crade The lowest temperature for strike test
Grade 1 -50 -45
Grade 3 -150 -100
Grade 4 -150 -100
Grade 6 -50 -45
Grade 7 -100 -75
Grade 8 -320 -195
Grade 9 -100 -75
Grade 10 -75 -60

 Mechanical requiremnts of ASTM A333 alloy pipe

Standard Grade Tensile Strength (MPa) Yield Point (MPa) Elongation (%)
Y X
ASTM A333 Grade 1 ≥380 ≥205 ≥35 ≥25
Grade 3 ≥450 ≥240 ≥30 ≥20
Grade 4 ≥415 ≥240 ≥30 ≥16.5
Grade 6 ≥415 ≥240 ≥30 ≥16.5
Grade 7 ≥450 ≥240 ≥30 ≥22
Grade 8 ≥690 ≥515 ≥22
Grade 9 ≥435 ≥315 ≥28
Grade 10 ≥550 ≥450 ≥22
Grade 11 ≥450 ≥240 ≥18

 Chemical Composition (%) of ASTM A333 steel pipe

Standard Grade Chemical Composition (%)
C Si Mn P S Cr Ni Cu Mo V Al
ASTM A333 Grade 1 ≤0.30 0.40~1.06 ≤0.025 ≤0.025
Grade 3 ≤0.19 0.18~0.37 0.31~0.64 ≤0.025 ≤0.025 3.18~3.82
Grade 4 ≤0.12 0.18~0.37 0.50~1.05 ≤0.025 ≤0.025 0.44~1.01 0.47~0.98 0.40~0.75 0.04~0.30
Grade 6 ≤0.30 ≥0.10 0.29~1.06 ≤0.025 ≤0.025
Grade 7 ≤0.19 0.13~0.32 ≤0.90 ≤0.025 ≤0.025 2.03~2.57
Grade 8 ≤0.13 0.13~0.32 ≤0.90 ≤0.025 ≤0.025 8.40~9.60
Grade 9 ≤0.20 0.40~1.06 ≤0.025 ≤0.025 1.60~2.24 0.75~1.25
Grade 10 ≤0.20 0.10~0.35 1.15~1.50 ≤0.03 ≤0.015 ≤0.15 ≤0.25 ≤0.015 ≤0.50 ≤0.12 ≤0.06
Grade 11 ≤0.10 ≤0.35 ≤0.6 ≤0.025 ≤0.025 ≤0.50 35.0~37.0 ≤0.50

Referenced Documents

  • A370 Test Methods and Definitions for Mechanical Testing of Steel Products
  • A671 Specification for Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures
  • A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
  • E23 Test Methods for Notched Bar Impact Testing of Metallic Materials

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