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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 is a standard for seamless steel pipes specifically designed for low-temperature environments and is widely used in fields such as petroleum, chemical engineering, and energy. The following is its detailed technical analysis:
I. Standard Definition and Core characteristics
1.Applicable temperature range
ASTM A333 covers multiple grades (Gr.1 - Gr.11), and different grades correspond to different low-temperature toughness:
• Gr.6: Most commonly used grade, minimum operating temperature -45°C (impact test temperature -45°C).• Gr.3 (containing 3.18% - 3.82% nickel) : Applicable at -100°C.
• Gr.8 (containing 8.4-9.6% nickel) : Applicable to -195°C (liquid nitrogen environment).
2. Material properties
• Low-temperature toughness: Through the aluminum deoxidation fine-grained process and normalizing/tempering heat treatment (such as normalizing at 900-930 °C + air cooling), the low-temperature resistance to brittle fracture is ensured.• Corrosion resistance: Low sulfur and phosphorus design (P≤0.025%, S≤0.025%) and alloying elements (such as Mn, Ni) enhance corrosion resistance.
• Welding performance: Low carbon content (Gr.6 carbon ≤0.30%) optimizes weldability.
II. Chemical Composition and mechanical properties
1.Typical chemical components (taking Gr.6 as an example) :
Element C Mn Si P S Others (Ni, Cr, etc.) Range ≤0.30% 0.29-1.06% ≥0.10% ≤0.025% ≤0.025% trace (such as Ni ≤0.040% )
2. Mechanical performance requirements:Grade tensile strength (MPa) Yield strength (MPa) Elongation (%) Impact energy (-45°C) Gr.6 ≥415 ≥240 ≥30% ≥18J (Measured often ≥27J) Gr.8 ≥690 ≥515 ≥22% -195°C side expansion ≥0.38mm Note: The measured impact energy value of Gr.6 is often higher than the standard (for example, the impact value at -46°C ≥27J).
III. Manufacturing process and specifications
1. Production process
- Hot rolling/cold drawing/hot expansion: Formed through processes such as piercing, rolling, and sizing to ensure dimensional accuracy.
- Heat treatment: Normalizing (above 815°C) or normalizing + tempering is required to eliminate residual stress and refine grains.
2. Specification range
- Outer diameter: 21.3mm - 762mm (expandable to 8-1240mm).
- Wall thickness: 2.0mm - 140mm, with a tolerance of wall thickness ≥87.5% of the nominal value.
IV. Application fields
1.Energy and Chemical Engineering
- LNG transportation: Liquid natural gas pipelines (mainly Gr.6 and Gr.8).
- Petrochemical equipment: Low-temperature reactors, heat exchangers (such as liquid nitrogen cooling systems).
2. Industry and Infrastructure
- Refrigeration system (ultra-low temperature cold storage), heat exchange pipelines of power station.
- Oil and gas transmission pipelines in high-altitude and cold regions (such as the Arctic Circle project).
V. Standards, specifications and quality control
1. Execution standards
• ASTM A333/ASME SA333: Core Manufacturing Standards.• GB/T 18984-2003: Chinese equivalent standard (such as 16MnDG corresponding to Gr.6).
2. Key inspection items
• Impact test: Charpy V-notch impact test.• Non-destructive testing: hydrostatic testing or eddy current testing to ensure no defects.
VI. Selection and usage suggestions
- Selection basis: Choose the grade based on the minimum design metal temperature (MDMT) (for example, Gr.6 at -45°C and Gr.3 at -100°C).
- Precautions for use:
- Avoid impact during transportation to prevent surface cracks.
- Welding should be matched with low-hydrogen welding materials (such as J507RH) to avoid cold cracks.
Summary
ASTM A333 seamless tubes, through composition optimization and heat treatment processes, possess both strength and toughness in low-temperature environments and are core materials for liquefied gas transportation and cryogenic equipment. Its multi-level design (mainly Gr.3/6/8) covers the requirements from -45°C to -195°C, and a strict standard system (ASTM/ASME/GB) ensures global engineering reliability. When selecting the type, it is necessary to comprehensively consider temperature, pressure and the corrosiveness of the medium, and pay attention to welding and maintenance standards.
ASTM A333 SMLS PIPE
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Keyword
- Details
-
ASTM A333 is a standard for seamless steel pipes specifically designed for low-temperature environments and is widely used in fields such as petroleum, chemical engineering, and energy. The following is its detailed technical analysis:
I. Standard Definition and Core characteristics
1.Applicable temperature range
ASTM A333 covers multiple grades (Gr.1 - Gr.11), and different grades correspond to different low-temperature toughness:
• Gr.6: Most commonly used grade, minimum operating temperature -45°C (impact test temperature -45°C).• Gr.3 (containing 3.18% - 3.82% nickel) : Applicable at -100°C.
• Gr.8 (containing 8.4-9.6% nickel) : Applicable to -195°C (liquid nitrogen environment).
2. Material properties
• Low-temperature toughness: Through the aluminum deoxidation fine-grained process and normalizing/tempering heat treatment (such as normalizing at 900-930 °C + air cooling), the low-temperature resistance to brittle fracture is ensured.• Corrosion resistance: Low sulfur and phosphorus design (P≤0.025%, S≤0.025%) and alloying elements (such as Mn, Ni) enhance corrosion resistance.
• Welding performance: Low carbon content (Gr.6 carbon ≤0.30%) optimizes weldability.
II. Chemical Composition and mechanical properties
1.Typical chemical components (taking Gr.6 as an example) :
Element C Mn Si P S Others (Ni, Cr, etc.) Range ≤0.30% 0.29-1.06% ≥0.10% ≤0.025% ≤0.025% trace (such as Ni ≤0.040% )
2. Mechanical performance requirements:Grade tensile strength (MPa) Yield strength (MPa) Elongation (%) Impact energy (-45°C) Gr.6 ≥415 ≥240 ≥30% ≥18J (Measured often ≥27J) Gr.8 ≥690 ≥515 ≥22% -195°C side expansion ≥0.38mm Note: The measured impact energy value of Gr.6 is often higher than the standard (for example, the impact value at -46°C ≥27J).
III. Manufacturing process and specifications
1. Production process
- Hot rolling/cold drawing/hot expansion: Formed through processes such as piercing, rolling, and sizing to ensure dimensional accuracy.
- Heat treatment: Normalizing (above 815°C) or normalizing + tempering is required to eliminate residual stress and refine grains.
2. Specification range
- Outer diameter: 21.3mm - 762mm (expandable to 8-1240mm).
- Wall thickness: 2.0mm - 140mm, with a tolerance of wall thickness ≥87.5% of the nominal value.
IV. Application fields
1.Energy and Chemical Engineering
- LNG transportation: Liquid natural gas pipelines (mainly Gr.6 and Gr.8).
- Petrochemical equipment: Low-temperature reactors, heat exchangers (such as liquid nitrogen cooling systems).
2. Industry and Infrastructure
- Refrigeration system (ultra-low temperature cold storage), heat exchange pipelines of power station.
- Oil and gas transmission pipelines in high-altitude and cold regions (such as the Arctic Circle project).
V. Standards, specifications and quality control
1. Execution standards
• ASTM A333/ASME SA333: Core Manufacturing Standards.• GB/T 18984-2003: Chinese equivalent standard (such as 16MnDG corresponding to Gr.6).
2. Key inspection items
• Impact test: Charpy V-notch impact test.• Non-destructive testing: hydrostatic testing or eddy current testing to ensure no defects.
VI. Selection and usage suggestions
- Selection basis: Choose the grade based on the minimum design metal temperature (MDMT) (for example, Gr.6 at -45°C and Gr.3 at -100°C).
- Precautions for use:
- Avoid impact during transportation to prevent surface cracks.
- Welding should be matched with low-hydrogen welding materials (such as J507RH) to avoid cold cracks.
Summary
ASTM A333 seamless tubes, through composition optimization and heat treatment processes, possess both strength and toughness in low-temperature environments and are core materials for liquefied gas transportation and cryogenic equipment. Its multi-level design (mainly Gr.3/6/8) covers the requirements from -45°C to -195°C, and a strict standard system (ASTM/ASME/GB) ensures global engineering reliability. When selecting the type, it is necessary to comprehensively consider temperature, pressure and the corrosiveness of the medium, and pay attention to welding and maintenance standards.
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Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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