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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.
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ST37 is a classic carbon structural steel grade in the German Industrial Standard (DIN), which is widely used in the industrial field due to its excellent comprehensive performance.
🔍 ST37 standards and specific requirements
ST37 is a grade of "non-alloy structural steel". Originally derived from the German standard DIN 17100, this standard has now been replaced by the European standard EN 10025. In the EN 10025 standard, the new grade most corresponding to ST37 is S235JR.
"ST" is the abbreviation of the German word "Stahl" (steel), and "37" indicates that the minimum tensile strength of the material is 370 MPa. It should be noted that although the name is based on tensile strength, in structural design, the main reference is its yield strength of 235 MPa.
The following are the core technical requirements of ST37:
Project Specific requirements Grade meaning Stahl (steel), minimum tensile strength 370 MPa Corresponding to the Chinese grade Q235B (most directly equivalent) Corresponding to the American grade ASTM A36 The chemical composition Carbon (C) ≤ 0.17%, phosphorus (P) ≤ 0.045%, sulfur (S) ≤ 0.045%.
The contents of manganese (Mn) and silicon (Si) are not subject to mandatory regulations
Mechanical properties Yield strength ≥ 235 MPa, tensile strength 360-510 MPa,
elongation after fracture ≥ 25% (adjusted according to product thickness)
ST37 is usually delivered in hot-rolled condition and may also be supplied in annealed condition upon request to achieve the best forming performance.
⚙️ ST37 seamless mechanical tube
ST37 seamless mechanical pipe refers to ST37 steel pipe manufactured by seamless process (i.e., without weld seams). This kind of pipe is usually produced in accordance with standards such as DIN 1629.
Advantages and Characteristics
• High pressure resistance:
Seamless pipes have no weld weaknesses, thus featuring uniform circumferential strength and excellent pressure resistance, making them suitable for high-pressure environments.
• High dimensional accuracy and surface quality:
Especially cold-rolled or cold-drawn (precision) seamless tubes, with precise dimensions and smooth surfaces, are suitable for mechanical parts with high precision requirements such as hydraulic cylinders and pneumatic cylinders.
• Good processability:
Just like ST37 base material, seamless tubes are also easy to weld, bend, stamping, etc.
Usage scenarios
ST37 seamless pipes are widely used in:
• Hydraulic and pneumatic systems:such as cylinder barrels for machine tools and construction machinery.
• Structural components:
Used for mechanical equipment frames, automotive parts, etc.
• Fluid transportation:
Pipelines used for transporting fluids such as water, gas and oil.
Precautions：
• Limited corrosion resistance:
As carbon steel, it is prone to rust in damp or corrosive environments, and surface protection (such as oiling, painting or galvanizing) should be noted.
• Processing technology selection:
Choose hot-rolled tubes (typically used for structural purposes) or cold-drawn precision tubes (for high-precision mechanical processing) based on the usage requirements.
⚖️ The difference between ST37 and ST52
ST52 is another common German structural steel, and its strength is higher than that of ST37. The following is a comparison of their core differences:
Compare items ST37 ST52 Strength grades Ordinary strength steel
High-strength structural steel Yield strength ≥ 235 MPa ≥ 355 MPa Tensile strength 360-510 MPa 510-680 MPa Carbon content Low carbon content(C≤0.17%) High carbon content (C≤0.22%) Core features It has excellent formability and weldability and is low in cost High strength, which can reduce the weight of the structure Typical applications Secondary structures of buildings, shell covers, and general sheet metal parts Mainstream building steel structures, heavy machinery, and load-bearing components Cost Slightly lower Slightly higher In simple terms, the ST37 is an "economical and practical" choice, emphasizing ease of processing and manufacturing. The ST52 is a "powerful and lightweight" choice, with a focus on load-bearing capacity.
💎 Summary and how to choose?
In simple terms, ST37 is a type of basic structural steel with balanced comprehensive performance, easy processing and low cost.
When making a choice, you can refer to the following ideas：
• Choose ST37:When your application scenarios (such as rack shells, platform stairs, general hardware) do not require extremely high strength, but you highly value the convenience of material forming, bending and welding, and hope to control costs.
• Choose ST52:
When used in scenarios such as main load-bearing structures, heavy mechanical parts or vehicle frames, where the material needs to have higher strength to ensure safety or reduce the weight of the structure.
• Select ST37 seamless pipe:
When it is necessary to convey fluids or use it as a mechanical structural component, and the working environment has certain pressure, and the pipe material is required to have no weld weaknesses.
ST37 SEAMLESS MECHANICAL PIPE
Subcategory
Keyword
- Details
-
ST37 is a classic carbon structural steel grade in the German Industrial Standard (DIN), which is widely used in the industrial field due to its excellent comprehensive performance.
🔍 ST37 standards and specific requirements
ST37 is a grade of "non-alloy structural steel". Originally derived from the German standard DIN 17100, this standard has now been replaced by the European standard EN 10025. In the EN 10025 standard, the new grade most corresponding to ST37 is S235JR.
"ST" is the abbreviation of the German word "Stahl" (steel), and "37" indicates that the minimum tensile strength of the material is 370 MPa. It should be noted that although the name is based on tensile strength, in structural design, the main reference is its yield strength of 235 MPa.
The following are the core technical requirements of ST37:
Project Specific requirements Grade meaning Stahl (steel), minimum tensile strength 370 MPa Corresponding to the Chinese grade Q235B (most directly equivalent) Corresponding to the American grade ASTM A36 The chemical composition Carbon (C) ≤ 0.17%, phosphorus (P) ≤ 0.045%, sulfur (S) ≤ 0.045%.
The contents of manganese (Mn) and silicon (Si) are not subject to mandatory regulations
Mechanical properties Yield strength ≥ 235 MPa, tensile strength 360-510 MPa,
elongation after fracture ≥ 25% (adjusted according to product thickness)
ST37 is usually delivered in hot-rolled condition and may also be supplied in annealed condition upon request to achieve the best forming performance.
⚙️ ST37 seamless mechanical tube
ST37 seamless mechanical pipe refers to ST37 steel pipe manufactured by seamless process (i.e., without weld seams). This kind of pipe is usually produced in accordance with standards such as DIN 1629.
Advantages and Characteristics
• High pressure resistance:
Seamless pipes have no weld weaknesses, thus featuring uniform circumferential strength and excellent pressure resistance, making them suitable for high-pressure environments.
• High dimensional accuracy and surface quality:
Especially cold-rolled or cold-drawn (precision) seamless tubes, with precise dimensions and smooth surfaces, are suitable for mechanical parts with high precision requirements such as hydraulic cylinders and pneumatic cylinders.
• Good processability:
Just like ST37 base material, seamless tubes are also easy to weld, bend, stamping, etc.
Usage scenarios
ST37 seamless pipes are widely used in:
• Hydraulic and pneumatic systems:such as cylinder barrels for machine tools and construction machinery.
• Structural components:
Used for mechanical equipment frames, automotive parts, etc.
• Fluid transportation:
Pipelines used for transporting fluids such as water, gas and oil.
Precautions：
• Limited corrosion resistance:
As carbon steel, it is prone to rust in damp or corrosive environments, and surface protection (such as oiling, painting or galvanizing) should be noted.
• Processing technology selection:
Choose hot-rolled tubes (typically used for structural purposes) or cold-drawn precision tubes (for high-precision mechanical processing) based on the usage requirements.
⚖️ The difference between ST37 and ST52
ST52 is another common German structural steel, and its strength is higher than that of ST37. The following is a comparison of their core differences:
Compare items ST37 ST52 Strength grades Ordinary strength steel
High-strength structural steel Yield strength ≥ 235 MPa ≥ 355 MPa Tensile strength 360-510 MPa 510-680 MPa Carbon content Low carbon content(C≤0.17%) High carbon content (C≤0.22%) Core features It has excellent formability and weldability and is low in cost High strength, which can reduce the weight of the structure Typical applications Secondary structures of buildings, shell covers, and general sheet metal parts Mainstream building steel structures, heavy machinery, and load-bearing components Cost Slightly lower Slightly higher In simple terms, the ST37 is an "economical and practical" choice, emphasizing ease of processing and manufacturing. The ST52 is a "powerful and lightweight" choice, with a focus on load-bearing capacity.
💎 Summary and how to choose?
In simple terms, ST37 is a type of basic structural steel with balanced comprehensive performance, easy processing and low cost.
When making a choice, you can refer to the following ideas：
• Choose ST37:When your application scenarios (such as rack shells, platform stairs, general hardware) do not require extremely high strength, but you highly value the convenience of material forming, bending and welding, and hope to control costs.
• Choose ST52:
When used in scenarios such as main load-bearing structures, heavy mechanical parts or vehicle frames, where the material needs to have higher strength to ensure safety or reduce the weight of the structure.
• Select ST37 seamless pipe:
When it is necessary to convey fluids or use it as a mechanical structural component, and the working environment has certain pressure, and the pipe material is required to have no weld weaknesses.
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Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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