a333 pipe GR.6

A333 GR.3,GR.6,GR.8 Pipe


ASTM A333 Seamless Pipe for Low-Temperature Service

1).Standard Executived: ASTM A333,ASTM A334

2).Materials: ASTM A333 Gr.1,Gr.3,Gr.6,Gr.7,Gr.8,Gr.9, Gr.10

3).Outside diameter:from 1/4" to 28"(13.7 mm to 711.2 mm)

4).Wall Thickness:2mm-100mm

Schedule: SCH40, STD, SCH80, XS, SCH160, XXS etc.

5).Length:4m-12.8m, customers' requirements

6).Ends:Plain ends or bevel ends

7).Coating for protection:can be required according to customers'requirements

8).Other Materials: ASTM A334 Gr.1,Gr.3,Gr.6,Gr.7,Gr.8,Gr.9,Gr.11


   ASTM A333 Standard covers seamless and welded steel pipe for low temperature service. The Grade 6 steel involved is similar to AISI 4032 low alloy steel. ASTM A333 Grade 6 pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.

A333 Steel Pipe Material & Manufacture:

ASTM A333 Pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.

Chemical Requirements

 Data   Composition, %  
Element Grade 1 Grade 3 Grade 6
Carbon, max 0.30 0.19 0.30
Manganese 0.40 – 1.06 0.31 – 0.64 0.29 – 1.06
Phosphorous, max 0.025 0.025 0.025
Sulfur, max 0.025 0.025 0.025
Silicon 0.18 -0.37 0.10 min
Nickel 3.18 – 3.82  

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.
When Grade 6 is ordered under this specification, supplying an alloy grade that specifically requires the addition of any element other than those listed for the ordered grade is not permitted. However, the addition of elements required for the deoxidation of the steel is permitted.


The material shall conform to the requirements as proscribed:

    A333 Gr.1 pipe A333 Grade.3 pipe A333 Gr.6 pipe
    psi MPa psi MPa psi MPa
Tensile Strength, min 55,000 380 65,000 450 60,000 415
Yield Strength, min 30,000 205 35,000 240 35,000 240
    Longitudinal Transverse Longitudinal Transverse Longitudinal Transverse
Elongation in 2 in. or 50 mm, (or 4D), min, %:      
Basic minimum elongation for walls 5/16 in.[8 mm] and over in thickness, strip tests,and for all small sizes tested in full section 35 35 30 20 30 16.5
When the standard round 2-in. or 50-mm gagelength or proportionally smaller size test specimen
with the gage length equal to 4D
(4 times the diameter) is used
28 20 22 14 22 12
For strip tests, a deduction for each 1/32in. [0.8 mm]decrease in wall thickness below 5/16 in. [8 mm]
from the basic minimum elongation of the following percentage
1.75 1.25 1.50 1.00 1.50 1.00
  Elongation in 2 in. or 50 mm, min, %: