we have obtained ISO 9001, ISO 14001, ISO 45001, CE, AAA-level credit rating certification, etc.
ASTM A423/A423M Standard Specification for Seamless and Electric-Welded Low-Alloy Steel Tubes.This specification covers minimum-wall-thickness, seamless and electric-resistance welded, low-alloy steel tubes for pressure containing parts such as economizers or other applications where corrosion resistance is important.
The tubing sizes and thicknesses usually furnished to this specification are 1/2 to 5 in.(12.7 to 127mm) in outside diameter and 0.035 to 0.500 in.(0.9 to 12.7mm)inclusive,in minimum wall thickness.
Chemical Composition
|
|
Compositon,% |
||
|
|
Grade 1 |
Graded 2 |
Grade 3 |
|
C(max) |
0.15 |
0.15 |
0.06 |
|
Mn(max) |
0.55 |
0.50-1.00 |
0.70-1.40 |
|
P(max) |
0.06-0.16 |
0.04 |
0.020 max |
|
S(max) |
0.06 |
0.05 |
0.02 |
|
Si |
0.10 min |
|
0.55 max |
|
Cu |
0.20-0.60 |
0.30-1.00 |
0.25-0.45 |
|
Cr |
0.24-1.31 |
|
|
|
Ni |
0.20-0.70 |
0.40-1.10 |
0.50 max |
Mechanical Properties
|
|
|
Grade 1 and 2 |
Grade 3 |
|
Tensile strength |
min,MPa |
415 |
380 |
|
Yield stremgth |
min,Mpa |
255 |
230 |
|
Elongation in 2in or 50mm |
min,% |
25 |
35 |
