Carbon Steel A333 Gra 6 Pipe description
SA333GR.6 American Standard Low-Temperature Seamless Pipe, as its name suggests, is a seamless steel pipe material specifically designed for low-temperature environments. It conforms to the standards set by the American Society for Testing and Materials (ASTM) and possesses excellent low-temperature toughness, high strength, and good impact resistance. This material is primarily made of low-carbon alloy steel, and through precise control of chemical composition and heat treatment processes, it ensures that the material maintains stable mechanical properties and good weldability even at extremely low temperatures. In particular, SA333GR.6 steel pipe can operate stably for extended periods in low-temperature ranges, meeting the application requirements of extreme environments such as polar regions and deep seas.
SA333 grade 6 chemical composition
| Carbon | Manganese | Phosphorus | Sulfur | Silicone | Nickel |
|---|---|---|---|---|---|
| 0.3 | 0.29-1.06 | 0.025 | 0.025 | ≥0.10 | – |
ASTM A333 grade.6 mechanical properties
| Grade | Yield strength, min, psi (MPa) | Elongation (%) | Tensile strength, min, psi (MPa) |
|---|---|---|---|
| A333 Grade.6 | 35 000 (240) | 30 min | 60 000 (415) |
SA 333 grade 6 equivalent
| BS | DIN | EN | NFA | ASME | ASTM |
|---|---|---|---|---|---|
| NFA A 36-2051) Grade A 42 AP | DIN 17178 Grade FGP 28 | EN P215NL Grade 10216-4 | ASTM A333 Grade6 | UNI C20 | ASME SA 333 Grade 6 |
ASTM A333 grade 6 pipe dimensions
| Outside diameter /mm | Wall thickness /mm | Legnth /m |
| 10-127 | 1-20 | 6-12.0 |
| 42-114.3 | 3.5-6 | 6-12.2 |
| 42-114.3 | 6-12 | 6-12.2 |
| 114.3-180 | 3.8-8 | 6-12.2 |
| 114.3-180 | 8-22 | 6-12.2 |
| 68-180 | 10-14 | 6-12.2 |
| 69-254 | 14-55 | 6-12.2 |
| 140-340 | 6-8 | 6-12.2 |
| 140-368 | 8-42 | 6-12.2 |
| 318-720 | 14-50 | 4-12.5 |
Applications
1. The "Main Force" in the Liquefied Natural Gas (LNG) Industry Chain
LNG Receiving Terminals and Storage & Transportation
Pre-cooling and Transition Pipelines: During the liquefaction process of LNG from ambient temperature to -162°C, GR.6 steel pipes are commonly used in pre-cooling sections (such as sections cooled to -45°C to -110°C) because their toughness at -45°C covers this temperature range, and their cost is lower than that of materials used at even lower temperatures.
Storage Tank Connections and Loading/Unloading Arms: Connecting LNG storage tanks to loading and unloading equipment, these arms withstand the dual effects of low-temperature media and the external environment, ensuring safe transportation.
LNG Ships and Land-Based Facilities
The cargo hold connection pipes of LNG carriers and the piping systems of land-based LNG refueling stations both require materials that maintain toughness at low temperatures; GR.6 is an economical and practical choice.
2. A Reliable Partner for Energy Development in Polar and Cold Regions
Polar Oil and Gas Field Gathering and Transportation: In the Arctic, Siberia, and other extremely cold regions, oil and gas extraction and gathering pipelines face external environmental temperatures as low as -50°C. Coupled with the cryogenic conditions of the media (such as dehydrated natural gas), GR.6 provides reliable cryogenic toughness.
Subsea Cryogenic Pipelines: In deep-sea oil and gas transportation, some pipeline sections are in extremely cold conditions due to the cryogenic media or the subsea environment. GR.6 is used to withstand the coupling effect of high pressure and low temperature, and its cost is superior to more advanced materials.
3. A Powerful Assistant for Industrial Refrigeration and Cryogenic Experiments
Large-Scale Refrigeration Systems
Chemical and Food Industries: Used for transporting refrigerants such as ammonia and Freon, with operating temperatures as low as -50°C (e.g., quick-freezing tunnels, cryogenic storage). GR.6 steel pipes stably support the refrigeration process.
Cryogenic Laboratories: Cooling pipes for particle accelerators and cryogenic physics experimental devices (such as liquid nitrogen and liquid argon cooling systems). GR.6 is commonly used for pre-cooling or auxiliary pipe sections (because the extreme temperature is close to its standard value, the core cryogenic section may be made of stainless steel).
4. "Cryogenic Guardians" for Shipbuilding and Marine Engineering
Polar Ship Piping: Fuel, lubricating oil, and cooling water systems for icebreakers and research vessels, especially when navigating in ice-covered areas where the external ambient temperature is extremely low. GR.6 ensures the reliability of pipelines at cryogenic temperatures.
Cryogenic Processes on Offshore Platforms: Connecting pipes for cryogenic separation equipment on offshore oil and gas platforms, such as cryogenic treatment sections in natural gas dehydration and dehydrocarbonization processes. GR.6 adapts to the dual challenges of corrosion and low temperatures in the marine environment.
Test and inspection
Packaging and shipping
