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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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ST52 seamless mechanical pipe is a kind of high-strength steel pipe, which has excellent mechanical properties and corrosion resistance, and is widely used in various mechanical equipment and structures. The pipe is made of high-quality fine steel and has a high degree of durability and wear resistance after multiple heat treatment processes.
ST52 seamless mechanical pipe Chemical composition:
ST52 Chemical Compositoin, min, % C Si Mn P S Ti V Nb 0.22 0.55 1.6 0.025 0.025 0.03 0.05 0.03 ST52 seamless mechanical pipe Physical property:
1. Yield strength:
- When the wall thickness d ≤ 16 mm, yield strength ≥355 MPa.
- When the wall thickness is 16 < d ≤ 40 mm, the yield strength is ≥345MPa
- When the wall thickness is 40 < d≤ 63 mm, the yield strength is ≥335MPa
- When the wall thickness is 63 < d≤ 80mm, the yield strength is ≥325MPa
- When the wall thickness is 80 < d≤ 100 mm, the yield strength is ≥315MPa
- When the wall thickness d > 100mm, the yield strength is determined by agreement
2. Tensile strength:- The tensile strength of St52 seamless steel pipe varies according to different heat treatment or state:
- Cold finishing (hard) BK status: Tensile strength ≥640 MPa
- Cold finishing (soft) BKW status: Tensile strength ≥580 MPa
- Cold finishing and stress relief BKS status: Tensile strength ≥580 MPa
- Annealed GBK state: Tensile strength ≥490 MPa
- Normalizing NSK state: Tensile strength 490~630 MPa
3. Elongation after breaking:
- Cold finishing (hard) BK state: elongation after breaking ≥4%
- Cold finishing (soft) BKW status: elongation after breaking ≥7%
- Cold finishing and stress relief BKS state: elongation after breaking ≥10%
- Annealing GBK state: elongation after breaking ≥22%
Application field:
- Hydraulic and pneumatic cylinders
- Civil construction
- Underground works
- Bridge structure
- Ocean structure
- Container manufacturing
- Automotive and machine building
Delivery status
- Cold Pull hard (BK)
- Cold Pull soft (BKW)
- Cold tension stress Relief (BKS)
- Annealed (GBK)
- Normalizing state (NBK)
Heat treatment
The heat treatment temperature range of the ST52 seamless mechanical tube is 1174°C to 1628°C.
What are the differences between different steel grades?
St52: This is a low-alloy, high-strength structural steel according to DIN 17100. It has a minimum yield strength of 355 MPa and is commonly used in construction and general engineering applications.
St52-3: This is an enhanced version of St52, which also conforms to DIN 17100. 3" indicates that the material has been normalized, that is, a controlled heating and cooling process to improve its mechanical properties. St52-3 has a minimum yield strength of 355 MPa and is known for its excellent weldability and toughness and is commonly used in welding structures and other applications requiring high strength and good impact toughness.
Heat treatment process:
St52: There are no specific heat treatment requirements.
St52-3: After normalizing, this is a controlled heating and cooling process designed to improve the mechanical properties of the material
Application field:
St52: Commonly used in architectural and general engineering applications.
St52-3: Because of its excellent weldability and toughness, it is commonly used in welding structures and other applications requiring high strength and good impact toughness
What are the advantages of ST52 seamless mechanical pipe compared with other materials?
1. High precision and excellent performance:
ST52 seamless precision steel pipe with high precision and excellent performance, suitable for hydraulic system steel pipe, automotive steel pipe and other industry applications, such as petrochemical, aerospace, power equipment and other fields.
2. Corrosion resistance:
ST52 pipe has good corrosion resistance, can resist acid, alkali, salt and atmospheric environment corrosion, high temperature resistance, good impact resistance and fatigue resistance.
3. High strength and high elasticity:
The tensile strength of ST52 pipe is more than 8-10 times that of ordinary steel, with excellent creep resistance, corrosion resistance and shock resistance.
4. Excellent mechanical properties:
ST52 tube has excellent mechanical properties, easy machining, high elasticity, repeated use in mechanical equipment, no memory, no deformation, and anti-static.
5. High pressure resistance:
Seamless steel pipe (such as ST52 pipe) excellent mechanical properties, ordinary seamless carbon steel pipe can withstand pressure from 1.6MPa to 6.4MPa, if the special alloy elements are added in the production, the pressure can reach ultra-high pressure.
6. Weldability advantages:
Seamless steel pipe has excellent weldability, easy to lengthen docking, plugging, etc., which makes it advantageous in connection and lengthening.
ST52 SEAMLESS MECHANICAL PIPE
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Keyword
- Details
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ST52 seamless mechanical pipe is a kind of high-strength steel pipe, which has excellent mechanical properties and corrosion resistance, and is widely used in various mechanical equipment and structures. The pipe is made of high-quality fine steel and has a high degree of durability and wear resistance after multiple heat treatment processes.
ST52 seamless mechanical pipe Chemical composition:
ST52 Chemical Compositoin, min, % C Si Mn P S Ti V Nb 0.22 0.55 1.6 0.025 0.025 0.03 0.05 0.03 ST52 seamless mechanical pipe Physical property:
1. Yield strength:
- When the wall thickness d ≤ 16 mm, yield strength ≥355 MPa.
- When the wall thickness is 16 < d ≤ 40 mm, the yield strength is ≥345MPa
- When the wall thickness is 40 < d≤ 63 mm, the yield strength is ≥335MPa
- When the wall thickness is 63 < d≤ 80mm, the yield strength is ≥325MPa
- When the wall thickness is 80 < d≤ 100 mm, the yield strength is ≥315MPa
- When the wall thickness d > 100mm, the yield strength is determined by agreement
2. Tensile strength:- The tensile strength of St52 seamless steel pipe varies according to different heat treatment or state:
- Cold finishing (hard) BK status: Tensile strength ≥640 MPa
- Cold finishing (soft) BKW status: Tensile strength ≥580 MPa
- Cold finishing and stress relief BKS status: Tensile strength ≥580 MPa
- Annealed GBK state: Tensile strength ≥490 MPa
- Normalizing NSK state: Tensile strength 490~630 MPa
3. Elongation after breaking:
- Cold finishing (hard) BK state: elongation after breaking ≥4%
- Cold finishing (soft) BKW status: elongation after breaking ≥7%
- Cold finishing and stress relief BKS state: elongation after breaking ≥10%
- Annealing GBK state: elongation after breaking ≥22%
Application field:
- Hydraulic and pneumatic cylinders
- Civil construction
- Underground works
- Bridge structure
- Ocean structure
- Container manufacturing
- Automotive and machine building
Delivery status
- Cold Pull hard (BK)
- Cold Pull soft (BKW)
- Cold tension stress Relief (BKS)
- Annealed (GBK)
- Normalizing state (NBK)
Heat treatment
The heat treatment temperature range of the ST52 seamless mechanical tube is 1174°C to 1628°C.
What are the differences between different steel grades?
St52: This is a low-alloy, high-strength structural steel according to DIN 17100. It has a minimum yield strength of 355 MPa and is commonly used in construction and general engineering applications.
St52-3: This is an enhanced version of St52, which also conforms to DIN 17100. 3" indicates that the material has been normalized, that is, a controlled heating and cooling process to improve its mechanical properties. St52-3 has a minimum yield strength of 355 MPa and is known for its excellent weldability and toughness and is commonly used in welding structures and other applications requiring high strength and good impact toughness.
Heat treatment process:
St52: There are no specific heat treatment requirements.
St52-3: After normalizing, this is a controlled heating and cooling process designed to improve the mechanical properties of the material
Application field:
St52: Commonly used in architectural and general engineering applications.
St52-3: Because of its excellent weldability and toughness, it is commonly used in welding structures and other applications requiring high strength and good impact toughness
What are the advantages of ST52 seamless mechanical pipe compared with other materials?
1. High precision and excellent performance:
ST52 seamless precision steel pipe with high precision and excellent performance, suitable for hydraulic system steel pipe, automotive steel pipe and other industry applications, such as petrochemical, aerospace, power equipment and other fields.
2. Corrosion resistance:
ST52 pipe has good corrosion resistance, can resist acid, alkali, salt and atmospheric environment corrosion, high temperature resistance, good impact resistance and fatigue resistance.
3. High strength and high elasticity:
The tensile strength of ST52 pipe is more than 8-10 times that of ordinary steel, with excellent creep resistance, corrosion resistance and shock resistance.
4. Excellent mechanical properties:
ST52 tube has excellent mechanical properties, easy machining, high elasticity, repeated use in mechanical equipment, no memory, no deformation, and anti-static.
5. High pressure resistance:
Seamless steel pipe (such as ST52 pipe) excellent mechanical properties, ordinary seamless carbon steel pipe can withstand pressure from 1.6MPa to 6.4MPa, if the special alloy elements are added in the production, the pressure can reach ultra-high pressure.
6. Weldability advantages:
Seamless steel pipe has excellent weldability, easy to lengthen docking, plugging, etc., which makes it advantageous in connection and lengthening.
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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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