ASTM A179 seamless pipe chemical composition and mechanical properties
Hit：52026-02-07 16:40:01
ASTM A179 seamless pipe chemical composition and mechanical properties
ASTM A179 (or ASME SA179) is a cold drawn low-carbon seamless steel pipe standard designed specifically for heat transfer equipment such as heat exchangers and condensers, with strict regulations on its chemical composition and mechanical properties.
chemical composition
The chemical composition of ASTM A179 steel pipes is mainly low-carbon, and the content of impurity elements is strictly controlled to ensure the purity and processing performance of the material. The main chemical composition (mass percentage) requirements are as follows:
Carbon (C): 0.06%~0.18%
Manganese (Mn): 0.27%~0.63%
Phosphorus (P): ≤ 0.035%
Sulfur (S): ≤ 0.035%
Silicon (Si): not explicitly defined in the standard, but usually has a low content (upper limit not listed in the data, generally controlled within the range of 0.17%~0.37% in actual production, similar to domestic 10 # steel)
Other elements: The standard does not allow the special addition of alloying elements other than the above elements (such as chromium, nickel, molybdenum, copper, etc.), and the residual element content brought in by the raw materials is usually controlled at Cr ≤ 0.25%, Ni ≤ 0.30%, Cu ≤ 0.25%.
mechanical properties
ASTM A179 steel pipes have good comprehensive mechanical properties after cold drawing and heat treatment, and are suitable for high-pressure and high-temperature environments
Tensile strength: ≥ 325 MPa
Yield strength: ≥ 180 MPa
Elongation rate: ≥ 35%
Hardness: ≤ 72 HRB (Rockwell B scale)
Metallographic structure: ferrite+pearlite
Heat treatment requirements: After the last cold drawing, heat treatment should be carried out at a temperature above 650 ℃ to eliminate processing stress and optimize the microstructure.
This material can work stably within the temperature range of -50 ℃ to 450 ℃, and has excellent cold bending, expansion, and flattening properties. It also has no oxide layer on the inner and outer walls and high surface smoothness, making it suitable for the manufacturing of high-precision heat exchange equipment.
