The ASTM A333 specification covers seamless and welded carbon steel pipes for low temperature service (down to -150 degrees F). Even if A333 pipes follow the dimensional range od ASME B36 10, specific nominal pipe size / schedule are not manufactured under the A333 specification as heavier wall thicknesses have a negative effect on the impact properties of the pipe at very low temperatures. 

ASTM A333 (source: ASTM):

This specification covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. The 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. This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This specification2 covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures and in other applications requiring notch toughness. 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 effect on impact properties. (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. (B) Where an ellipsis (...) appears in this table, there is no requirement and analysis for the element need not to be determined or reported. (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.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 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.”


ASTM A333 pipes are available in nine different carbon steel grades designated by numbers 1, 3, 4, 6, 7, 8, 9, 10, & 11 (the most common grade is astm a333 grade 6)

C Si Mn P S Cr Ni Cu Mo V Al
A333 Gr. 1 <=0.30   0.40-1.06 <=0.025 <=0.025            
A333 Gr. 3 <=0.19 0.18-0.37 0.31-0.64 <=0.025 <=0.025   3.18-3.82        
A333 Gr. 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
A333 Gr. 6 <=0.30 ≥0.10 0.29-1.06 <=0.025 <=0.025            
A333 Gr. 7 <=0.19 0.13-0.32 <=0.90 <=0.025 <=0.025   2.03-2.57        
A333 Gr. 8 <=0.13 0.13-0.32 <=0.90 <=0.025 <=0.025   8.40-9.60        
A333 Gr. 9 <=0.20   0.40-1.06 <=0.025 <=0.025   1.60-2.24 0.75-1.25      
A333 Gr. 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

A333 Gr. 11

<=0.10 <=0.35 <=0.6 <=0.025 <=0.025 <=0.50 35.0-37.0   <=0.50


  ASTM A333 Gr. 1 ASTM A333 Gr. 3 ASTM A333 Gr. 6
Tensile Strength 55,000 65,000      60,000
(min PSI)
Yield Strength 30,000 35,000 35,000
(min PSI)



A333 pipes are supplied in normalized conditions and the Charpy impact test is always executed to specific temperatures to ensure the compliance of the products to the temperature range set by the standard. The minimum impact test temperatures by grade are shown in the table below:

A333 Material Grade F C
Gr. 1 -50° -45°
Gr. 3 -150° -100°
Gr. 6 -50° -45°


The mechanical testing on A333 pipes shall be executed as follows:

  • transverse / longitudinal tension / flattening / hardness / bend: tests to be made on 5% of the pipe from each treated lot. For smaller lots, at least one pipe has to be tested. For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipe.
  • Hydrostatic / impact / one notched bar impact: shall be made from each heat represented in a heat-treatment load on specimens taken from the finished pipe.


Pipe Mill Country
Siderca Argentina
Jiangu Chengde Steel Tube China
Heng Yeng China
Lubao Steel China
Suzhou Seamless China
YYC China
Chomutov Czech Republic
Mittal Steel Czech Republic / Romania
Vallourec Europe
Tenaris Italy
NKK / Tenaris Japan
Tamsa Mexico
Huta Batory Poland
Nikopol Romania
Volzhsky Russia
Productos Tubulares Spain
Tubos Reunidos Spain
Productos Tubulares Spain
Vallourec Star USA



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