SA-106Gr.C seamless steel pipe is a type of high-temperature carbon steel seamless pipe. The following is a detailed introduction.

First, the chemical composition of SA-106Gr.C seamless steel pipe.
Carbon: Content not exceeding 0.35%, providing basic strength so that the steel pipe can withstand high pressure after heat treatment.
Manganese: Content between 0.29% and 1.06%, providing solid solution strengthening, significantly improving the strength and toughness of the steel pipe, and reducing the risk of fracture.
Silicon: Content between 0.10% and 0.30%, contributing to deoxidation and enhancing the overall performance of the steel pipe.
Phosphorus and Sulfur: Content not exceeding 0.035%, strictly controlling impurity content to avoid harmful inclusions, reducing the toughness and corrosion resistance of the steel pipe.
Other elements: Also includes certain amounts of copper, nickel, chromium, molybdenum, and vanadium, but their contents are relatively low.

Second, the mechanical properties of SA-106Gr.C seamless steel pipes.
Tensile strength: At least 485MPa, ensuring the pipe will not break under high-pressure steam conditions.
Yield strength: At least 275MPa, preventing irreversible deformation under pressure and maintaining system safety.
Elongation: At least 22%, reflecting the pipe's toughness and enabling it to adapt to thermal stress changes, preventing cracking.

Third, the manufacturing process of SA-106Gr.C seamless steel pipes.
Raw material preparation: High-quality carbon steel raw materials are selected.
Pre-processing: The raw materials undergo pre-treatment such as cutting and straightening.
Heating: The pre-processed raw materials are heated to an appropriate temperature.
Piercing/Forging: The heated raw materials are pierced or forged into pipe blanks.
Cooling: The pipe blanks are cooled.
Defect removal: The cooled pipe blanks are inspected to remove surface and internal defects.
Heat treatment: Normalizing (870~940℃) is usually used to refine the grains and improve the strength and toughness of the steel pipe.