ASTM A423/ A423M standard contains three grades which are Grade 1, Grade 2, Grade 3, determines minimum-wall-thickness, seamless and electric- resistance [TJC STEEL]welded, low-alloy steel tubes for pressure containing parts such as economizers or other applications where corrosion resistance is important.

 

Seamless or Welded Pipes/ Tubes’ sizes and thicknesses under standard of ASTM A423/ A423M are 12.7 to 127mm( outside diameter) and 0.9 to 12.7mm( thickness). When seamless type, the producing process would be hot finished or cold finished. [TJC STEEL]Heat treatment would be Normalized or other relevant heat treatments necessary to conform purchasing requirements.

 

Chemical Composition of A423 Grade 1, A423 Grade 2, A423 Grade 3(%):

A423Gr1:

C: 0.15

Mn: 0.55 max

P: 0.06-0.16

S: 0.060

Si: 0.10 min

Cu: 0.20-0.60

Cr: 0.24-1.31

Ni: 0.20-0.70[TJC STEEL]

Mo: -

Sb: -

 

A423Gr2:

C: 0.15

Mn: 0.50-1.00

P: 0.04 max

S: 0.05

Si: -

Cu: 0.30-1.00

Cr: -

Ni: 0.40-1.10

Mo: - 0.10 min

Sb: -

 

A423Gr3:

C: 0.06

Mn: 0.70-1.40

P: 0.020 max

S: 0.020

Si: 0.55 max

Cu: 0.25-0.45[TJC STEEL]

Cr: -

Ni: 0.50 max

Mo: 0.20 max

Sb: 0.05-0.15

 

Mechanical Properties:

 

A423Gr1, A423Gr2:

Tensile Strength(MPa): 415 min

Yield Strength(MPa): 255 min

Elongation(%): 25 min

 

A423Gr3:

Tensile Strength(MPa): 380

Yield Strength(MPa): 230

Elongation(%) : 35

 

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