ASTM A334 Gr.1 Low-Finned Tube for Low-Temperature Service in the Natural Gas Industry
Price:
Negotiable
MOQ:
2PCS
Delivery Time:
Negotiable
Brand:
YUHONG
Product Description
ASTM A334 Gr.1 low-finned tubes provide significant advantages in natural gas industry applications, combining material standards with optimal performance for low-temperature operations. Manufactured to ASTM A334 specifications, this material is designed for service down to -45°C, making it ideal for critical processes including natural gas liquefaction pre-cooling, BOG (Boil-Off Gas) treatment systems, and LNG storage tank insulation circulation.
The standard requires the material to achieve an average Charpy impact energy of at least 18J at -45°C, with no individual specimen falling below 13.5J. This toughness specification effectively prevents brittle fracture risks common in standard carbon steel pipes under low-temperature conditions, ensuring fundamental safety for natural gas facility operations.
Chemical Composition
| Element | Composition |
|---|---|
| Carbon (C) | ≤ 0.30% |
| Manganese (Mn) | 0.40-1.06% |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.025% |
Element Explanations:
- Low carbon content ensures excellent plasticity at low temperatures
- Precisely controlled manganese range prevents brittleness while maintaining strength
- Minimal phosphorus and sulfur content reduces grain boundary embrittlement risks in low-temperature environments
Physical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa |
| Yield Strength | ≥ 240 MPa |
| Elongation | ≥ 30% |
Performance Explanations:
- The tensile-to-yield strength ratio (approximately 1.73) ensures adequate strain hardening capability
- Minimum 30% elongation exceeds ordinary carbon steel pipes (typically 20-25%), providing superior plastic deformation capacity
- This strength-plasticity balance is crucial for preventing low-temperature brittle fractures while maintaining load-bearing capacity
Advantages of Low-Finned Structure in Natural Gas Applications
Enhanced Heat Transfer Efficiency
Technical Basis:
- Low-finned structure significantly increases heat transfer area on ASTM A334 Gr.1 base material
- High ductility (≥30% elongation) ensures superior fin forming quality
- Enables efficient heat exchange within space-constrained LNG receiving terminals
- Reduces heat exchanger volume, lowering overall facility footprint and costs
- Improves BOG handling efficiency and minimizes natural gas losses
Optimized Frost Resistance
Technical Basis:
- Combines ASTM A334 Gr.1 fine-grained structure with low-finned design
- Material's thermal expansion coefficient compatibility with fin geometry
- Reduces frost formation on heat exchange surfaces in LNG facilities, extending maintenance cycles
- Maintains stable heat transfer efficiency, preventing system performance degradation
- Lowers operational costs and improves equipment availability at LNG receiving terminals
Assurance of Welding Reliability
Technical Basis:
- ASTM A334 requires material to have "good weldability"
- Moderate carbon equivalent (controlled by standard chemical composition) ensures welding quality
- Ensures reliability at critical connection points within LNG facilities
- Reduces leakage risks from welding defects, enhancing natural gas infrastructure safety
- Accommodates complex on-site welding conditions, guaranteeing construction quality
Specific Application Scenarios in the Natural Gas Industry
BOG (Boil-Off Gas) Treatment System in LNG Receiving Terminals
Application Description:
- BOG systems handle naturally evaporated natural gas from LNG storage tanks, operating between -100°C and -40°C
- A334 GR.1 low-finned tubes used in BOG compressor coolers and reliquefaction unit heat exchangers
- Fine-grained structure from normalization heat treatment enhances material stability during temperature fluctuations
- High elongation (≥30%) enables material to withstand frequent temperature cycling in BOG systems
- Low phosphorus and sulfur content reduces embrittlement risk during long-term operation
Natural Gas Precooling Systems
Application Description:
- Natural gas undergoes multi-stage precooling before LNG liquefaction, with -45°C stage being critical
- A334 GR.1 low-finned tubes used in heat exchangers for this temperature stage
- -45°C impact energy requirement (§8.2.1) specifically designed for this operating condition
- Moderate manganese content range optimizes strength-toughness balance for pressure fluctuations
- Strict surface quality requirements ensure defect-free tubes, preventing micro-crack propagation
LNG Storage Tank Insulation (Cold Conservation) Systems
Application Description:
- LNG storage tanks require multi-layer insulation systems to maintain -162°C storage temperature
- A334 GR.1 low-finned tubes used in interlayer nitrogen circulation cooling systems
- 18J impact energy requirement provides sufficient safety margin for tank insulation system reliability
- Fine-grained structure lowers ductile-to-brittle transition temperature for safe operation around -45°C
- Strict chemical composition control minimizes performance degradation during long-term operation
Intermediate Cooling Stages in Natural Gas Liquefaction Plants
Application Description:
- Multi-stage cooling process in natural gas liquefaction includes stages operating near -45°C
- A334 GR.1 low-finned tubes used in heat exchangers for these temperature stages
- Compatibility with ASME B31.3 Process Piping code simplifies design approval process
- 30% elongation ensures material withstands temperature fluctuations common in liquefaction processes
- Clearly defined applicable temperature range (-45°C) provides reliable design boundary
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YUHONG HOLDING GROUP CO., LTD
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