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About us
Tianjin lefin Industrial
TIANJIN LEFIN STEEL GROUP containing Tianjin lefin Industrial Co.,Ltd. 、Tianjin lefin steel import & export Co.,Ltd and Tianjin Shengqifeng International Trading Co., Ltd. -
Products
Steel Pipe Processing
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard -
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Service Capability
Guarantee Quality
Our steel pipes are suitable for oil, natural gas, shipbuilding, chemical industry, water conservancy, electrical, steel structure, construction and other related fields.
- Details
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ASTM A333 GR.6 seamless steel pipe is a special type of steel pipe specially designed for low-temperature environments. Its core advantages lie in excellent low-temperature toughness and reliable mechanical properties, and it is widely used in energy, chemical and other fields. The following is a detailed analysis:
I. Core features and advantages
1. Excellent low-temperature toughness
It still maintains a Charpy impact energy of ≥18J at -45°C (measured to be usually ≥27J), effectively avoiding the risk of brittle fracture at low temperatures.By means of low-carbon design (C≤0.30%) and low impurity control (P≤0.025%, S≤0.025%), the tendency of grain boundary embrittlement is reduced.
Add alloying elements such as manganese and nickel (Mn:0.29-1.06%, Ni≤0.40%) to enhance the low-temperature deformation resistance.
2. High strength and stability
The tensile strength is ≥415MPa, the yield strength is ≥240MPa, and the elongation is ≥30%, ensuring the structural integrity of the pipeline under high-pressure and low-temperature working conditions.Normalizing heat treatment process (holding at 900-930°C for 10-20 minutes followed by air cooling) refines grains, eliminates residual stress and enhances dimensional stability.
3. Excellent processing and corrosion resistance
The low-carbon content optimizes the welding performance, supports the matching of low-hydrogen welding materials (such as J507RH), and reduces the risk of cold cracking.The combination of alloying elements (such as Cr and Cu) enhances the resistance to acid, alkali and salt corrosion, making it suitable for chemical medium environments.
II. Key performance parameters
Project Required value Typical value Impact energy ≥18J (-45°C) ≥27J Tensile strength ≥415MPa 420-550MPa Yield strength ≥240MPa 250-300MPa Elongation ≥30% 30-50% III. Manufacturing process and specifications
1. Production process
Hot rolling/cold drawing/hot expansion forming, combined with piercing, rolling, sizing and other processes to ensure dimensional accuracy.• Strict heat treatment: In addition to normalizing, tempering or quenching + tempering (such as above 815°C) can be selected to adapt to different working conditions.
2. Specification range
• Outer diameter: 21.3mm to 762mm (expandable to 48.3 to 711mm for customization).• Wall thickness: 2.0mm to 140mm, tolerance control ≤12.5%.
IV. Application fields
1.Liquefied natural gas (LNG) system
- Liquefaction unit transmission pipelines, cryogenic storage tank pipelines (-45°C environment).
2. Petrochemical industry
- Ethylene cracking unit, cryogenic separation equipment, urea synthesis reactor pipelines.
3. Energy and Infrastructure
- Nuclear power cooling systems, ultra-low temperature cold storage pipelines, and gas transmission systems for polar research stations.
- Oil and gas gathering and transportation pipelines in high-altitude and cold regions (such as the Arctic Circle project).
4. Industrial equipment
- Pipelines for low-temperature heat exchangers, pressure vessels and separators.
V. precautions for use
- Transportation and storage: Avoid impact to prevent surface crack propagation.
- Welding process: Preheating (≥100°C) is required, and low-hydrogen electrodes should be used. After welding, slow cooling is necessary to reduce cold cracks.
- Regular inspection: Eddy current testing or hydrostatic testing is conducted during service to monitor potential defects.
Summary
ASTM A333 GR.6 seamless tubes, with their optimized composition (low carbon and low impurities + alloy strengthening), heat treatment process (normalizing/tempering), and strict testing standards, have become the ideal material for low-temperature engineering at -45°C. It is widely applied in scenarios such as LNG, petrochemicals, and nuclear power, and is particularly irreplaceable in high-pressure cryogenic systems. When selecting the type, the temperature, pressure and corrosiveness of the medium should be comprehensively considered, and the welding and maintenance specifications should be followed to ensure long-term safe operation.
ASTM A333 GR.60 SMLS PIPE
Subcategory
Keyword
- Details
-
ASTM A333 GR.6 seamless steel pipe is a special type of steel pipe specially designed for low-temperature environments. Its core advantages lie in excellent low-temperature toughness and reliable mechanical properties, and it is widely used in energy, chemical and other fields. The following is a detailed analysis:
I. Core features and advantages
1. Excellent low-temperature toughness
It still maintains a Charpy impact energy of ≥18J at -45°C (measured to be usually ≥27J), effectively avoiding the risk of brittle fracture at low temperatures.By means of low-carbon design (C≤0.30%) and low impurity control (P≤0.025%, S≤0.025%), the tendency of grain boundary embrittlement is reduced.
Add alloying elements such as manganese and nickel (Mn:0.29-1.06%, Ni≤0.40%) to enhance the low-temperature deformation resistance.
2. High strength and stability
The tensile strength is ≥415MPa, the yield strength is ≥240MPa, and the elongation is ≥30%, ensuring the structural integrity of the pipeline under high-pressure and low-temperature working conditions.Normalizing heat treatment process (holding at 900-930°C for 10-20 minutes followed by air cooling) refines grains, eliminates residual stress and enhances dimensional stability.
3. Excellent processing and corrosion resistance
The low-carbon content optimizes the welding performance, supports the matching of low-hydrogen welding materials (such as J507RH), and reduces the risk of cold cracking.The combination of alloying elements (such as Cr and Cu) enhances the resistance to acid, alkali and salt corrosion, making it suitable for chemical medium environments.
II. Key performance parameters
Project Required value Typical value Impact energy ≥18J (-45°C) ≥27J Tensile strength ≥415MPa 420-550MPa Yield strength ≥240MPa 250-300MPa Elongation ≥30% 30-50% III. Manufacturing process and specifications
1. Production process
Hot rolling/cold drawing/hot expansion forming, combined with piercing, rolling, sizing and other processes to ensure dimensional accuracy.• Strict heat treatment: In addition to normalizing, tempering or quenching + tempering (such as above 815°C) can be selected to adapt to different working conditions.
2. Specification range
• Outer diameter: 21.3mm to 762mm (expandable to 48.3 to 711mm for customization).• Wall thickness: 2.0mm to 140mm, tolerance control ≤12.5%.
IV. Application fields
1.Liquefied natural gas (LNG) system
- Liquefaction unit transmission pipelines, cryogenic storage tank pipelines (-45°C environment).
2. Petrochemical industry
- Ethylene cracking unit, cryogenic separation equipment, urea synthesis reactor pipelines.
3. Energy and Infrastructure
- Nuclear power cooling systems, ultra-low temperature cold storage pipelines, and gas transmission systems for polar research stations.
- Oil and gas gathering and transportation pipelines in high-altitude and cold regions (such as the Arctic Circle project).
4. Industrial equipment
- Pipelines for low-temperature heat exchangers, pressure vessels and separators.
V. precautions for use
- Transportation and storage: Avoid impact to prevent surface crack propagation.
- Welding process: Preheating (≥100°C) is required, and low-hydrogen electrodes should be used. After welding, slow cooling is necessary to reduce cold cracks.
- Regular inspection: Eddy current testing or hydrostatic testing is conducted during service to monitor potential defects.
Summary
ASTM A333 GR.6 seamless tubes, with their optimized composition (low carbon and low impurities + alloy strengthening), heat treatment process (normalizing/tempering), and strict testing standards, have become the ideal material for low-temperature engineering at -45°C. It is widely applied in scenarios such as LNG, petrochemicals, and nuclear power, and is particularly irreplaceable in high-pressure cryogenic systems. When selecting the type, the temperature, pressure and corrosiveness of the medium should be comprehensively considered, and the welding and maintenance specifications should be followed to ensure long-term safe operation.
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Address: Hengtai Road,Daqiuzhuang Town,Jinghai County,Tianjin,China
Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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