ASTM A106 Seamless carbon steel tube for high temperature applications, hot rolled/cold drawn process. Steel Grades: Grade A, Grade B, Grade C (Grade B is the absolute mainstream)

Application Scenarios: High-temperature, high-pressure fluid transportation (boiler steam, superheater, hot oil, high-temperature water, oil and gas), power, petrochemical, boiler, power plant, heating network

Material Introduction (Grade A/B/C)

Grade A (Grade A, low-carbon high-temperature type): C≤0.25%, Mn 0.27~0.93%, low-carbon mild steel, with optimal plasticity, low-temperature toughness, and weldability. Lower high-temperature strength, suitable for low-temperature + medium-temperature, low-pressure, and non-critical high-temperature pipelines.

Grade B (Grade B, preferred for global exports): C≤0.30%, Mn 0.29~1.06%, Si≥0.10%, golden balance of strength, high-temperature performance, and weldability. Silicon-reinforced, high-temperature creep resistance, oxidation resistance, long-term stability at 450℃, short-term resistance to 650℃. Applications: Boiler steam, power plant superheaters, petrochemical hot oil, high-pressure and high-temperature pipelines (90% export projects)

Grade C (C grade, high strength and high temperature): C≤0.35%, Mn 0.29~1.06%, highest carbon content, strongest strength at room temperature/high temperature. Suitable for ultra-high pressure and ultra-high temperature critical pipelines (such as subcritical boilers). Strict preheating is required for welding. Limited export availability, custom-made.

Product Advantages

Authoritative American Standards, High-Temperature Dedicated:ASTM/ASME dual certification (equivalent to SA106), the only universal carbon steel pipe in the global boiler, power plant, and petrochemical high-temperature fields. Specifically designed for high temperatures (450℃+) and high pressures (10~25MPa), unlike ordinary A53 (low pressure, normal temperature).

High-Temperature Performance Surpasses Ordinary Carbon Steel Pipes:Si Strengthening: High-temperature formation of a SiO₂ protective film, with creep resistance, oxidation resistance, and heat brittleness resistance 3 times higher than Q235. Grade B, allowable stress at 450℃: 180MPa, long-term stable without deformation or cracking.

Balanced Strength and Toughness, Safe and Reliable:Low sulfur and phosphorus (≤0.035%) + controlled rolling process: -29℃ impact ≥20J, suitable for both extreme cold and high temperatures. Seamless construction with no weld seams or leaks; 100% flaw detection + water pressure testing; zero leakage; long service life (30-50 years).

Welding/machining compatible with global standards: Grade B. Excellent weldability; standard welding rods/wires are sufficient; low preheating requirements; joint strength equal to the base material. Easy to cut, thread, bevele, and bend.

Full range of specifications; high cost-performance ratio.

Chemical composition (mass fraction %)

Mechanical properties

Statistics on the popular models and common specifications of carbon steel pipes

Select materials based on application

For general fluid transportation (water, gas, oil): 20#, Q235B, A53 Gr.B, STPG370

The best cost-performance ratio, globally applicable

For high-temperature / steam / boiler pipes: A106 Gr.B, 20G, 15CrMoG, P235TR1/P235GH

Better resistance to high temperature and pressure

For oil and gas pipelines: API 5L Gr.B, X42, X52, X60

High strength and good toughness, suitable for long-distance pipelines

For low-temperature environments (cold storage, LNG support): A333 Gr.1/Gr.3, 16MnDG

Resistant to low temperature without cracking

For structural pipes (supports, machinery, steel structures): Q355B (old 16Mn), St44.2, A36

High strength and good load-bearing capacity