About ASTM A423 grade 3 low alloy steel pipe product introduction
ASTM A423 Grade 3 steel pipe covers minimum wall thickness, seamless and resistance welded, low alloy steel pipe used in pressure-bearing components such as economizers or other applications where corrosion resistance is important.
1: Standard Specification for Seamless and Electrically Welded Low Alloy Steel Pipes
ASTM A423 Grade 3 steel pipe covers minimum wall thickness, seamless and resistance welded, low alloy steel pipe used in pressure-bearing components such as economizers or other applications where corrosion resistance is important.
ASTM A423 Grade 3 low-alloy steel pipe generally supplied in accordance with this specification has a minimum size and thickness of 1/2 to 5 in. (12.7 to 127 mm) outside diameter and 0.035 to 0.500 in. (0.9 to 12.7 mm), inclusive chamber wall thickness .
2: Production process: ASTM A423 grade 3 low alloy steel pipes manufactured using a seamless process can be hot or cold processed.
3: Heat Treatment: ASTM A423 Grade 3 low alloy steel pipe shall be normalized or subjected to such healing treatment
| Carbon, max |
0.06 |
| Manganese |
0.70-1.40 |
| Phosphorus |
0.020 max |
| Sullur. max |
0.020 |
| Silicon |
0.55 max |
| Copper |
0.25-0.45 |
| Chromium |
…. |
| Nickel |
0.50 max |
| Molybdenum |
0.20 max |
| Antimony |
0.05-0.15 |
Mechanical Properties
| |
Grade 3 |
| Tensile strength, min. ksi |
55[380] |
| Yield strength, min, ksi [MPa] |
33[230] |
| Elongation in 2 in. or 50 mm. min, % |
35 |
| For longitudinal strip tests a deduction for each 1/32 in.[0.6 mm] decrease in wall thickness below 5/16in. [8 mm] from the basic minimum elongation of the following percentage points shall be made |
1.25 A |
| Hardness |
170 HB |
Calculated elongation requirements shall be rounded to the nearest whole number.
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