12DQ4 is a special grade of steel tubing manufactured by Nippon Steel & Sumitomo Metal Corporation. It is a low-alloyed steel made specifically for high-pressure piping systems. It is often used to provide reliable, durable, and efficient piping solutions in industrial applications as well as industrial structures and equipment. This steel has excellent mechanical properties, making it highly resistant to corrosion, temperature, pressure, and other environmental factors. 12DQ4 is also resistant to pitting and crevicing and its resistance to stress corrosion cracking provides an additional advantage when used in extremely aggressive environments. These qualities make it an ideal choice for transporting hazardous materials, oil, natural gas, and chemicals.