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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. -
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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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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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AISI 1117 is a low-carbon sulfur-based free-cutting structural steel in the American Iron and Steel Institute (AISI) standard. It is widely used in the field of mechanical manufacturing due to its excellent cutting performance, moderate strength and good machinability. The following is a comprehensive introduction to this standard:
I. Standard Background and Classification
System to which: AISI 1117 belongs to the standard system of the American Iron and Steel Institute (AISI), corresponding to SAE 1117 in the SAE standard (execution standard: SAE J403-2001/2014).Material type: Low-carbon sulfur-based free-cutting Steel (Free-Machining Steel), which significantly enhances cutting efficiency by adding sulfur (S) and a small amount of lead (Pb).
II. Chemical Composition
The core chemical composition design of AISI 1117 aims to optimize the balance between cutting performance and mechanical strength:
Element Content Range (%) Function Carbon (C) 0.14-0.20 Base Strength And Hardness Source Manganese (Mn) 1.00-1.30 Enhances Hardenability And Refines Grains Sulfur (S) 0.08-0.13 Forms Manganese Sulfide Inclusions, Improving Machinability Phosphorus (P) ≤0.040 Control The Impurity Content Lead (Pb) Trace amounts(optional) Further Reduce Tool Wear And Enhance Surface Finish Note: High sulfur content is the key to its machinability, but it may affect weldability (heat input needs to be strictly controlled).
III. Physical and Mechanical Properties
Basic performance- Tensile strength: 490-800 MPa (can reach the upper limit after heat treatment)
- Yield strength: 390-415 MPa
- Elongation: ≥15% (annealed state)
- Hardness: 120 HB (annealed state), and can reach 167-217 HB in cold-drawn state.
Core advantage- Cutting performance: Manganese sulfide inclusions reduce tool friction, support high-speed cutting, and extend tool life.
- Processing adaptability: Suitable for precision processing such as turning, milling and drilling, with high surface finish.
- Heat treatment responsiveness: The performance can be adjusted through processes such as annealing and quenching and tempering (for example, the tensile strength can be increased to 800MPa after quenching and tempering).
IV. Heat Treatment Process
Heat treatment is a key link in optimizing performance:
- Annealing: Hold at 780-820℃ and cool slowly to reduce hardness to 120 HB, enhance plasticity and optimize machinability.
- Quenching and tempering (quenching + tempering) :
- Quenching: Water or oil cooling at 850-880℃ to obtain martensitic structure;
- Tempering: Hold at 500-600℃ to balance strength and toughness.
- Normalizing: Improves the uniformity of the structure and is suitable for subsequent cold working.
V. Application Fields
AISI 1117 is widely used in components that require high-precision cutting and medium loads:
- Mechanical manufacturing: shafts, gears, pins, bolts and other parts that require precision processing.
- Automotive industry: transmission components, braking system parts, steering components.
- Instruments and meters: Wear-resistant parts, carburized parts (surface hardening + core toughness).
- General structural components: non-load-bearing brackets, shelves, agricultural machinery parts.
VI. Precautions for Use
Welding performanceHigh sulfur content is prone to cause hot cracks, and low heat input welding processes (such as gas shielded welding) should be adopted and preheating should be carried out.
Environmental adaptabilityIt has relatively weak corrosion resistance and requires galvanization or painting for protection in exposed environments .
Avoid use in low-temperature (<-40℃) or high-impact scenarios (with limited toughness).
Safety protectionLead-containing versions need to be protected from dust inhalation (protective equipment should be worn during processing).
Summary
The core value of AISI 1117 lies in balancing cutting efficiency and mechanical properties, and it is particularly suitable for precision parts in mass production. Its limitations (such as weldability and corrosion resistance) need to be compensated for through process optimization and surface treatment. When selecting the type, it is necessary to take into account the load, environment and processing requirements, and match heat treatment and protective measures to maximize the potential of the material.
AISI 1117 STEEL PIPE
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- Details
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AISI 1117 is a low-carbon sulfur-based free-cutting structural steel in the American Iron and Steel Institute (AISI) standard. It is widely used in the field of mechanical manufacturing due to its excellent cutting performance, moderate strength and good machinability. The following is a comprehensive introduction to this standard:
I. Standard Background and Classification
System to which: AISI 1117 belongs to the standard system of the American Iron and Steel Institute (AISI), corresponding to SAE 1117 in the SAE standard (execution standard: SAE J403-2001/2014).Material type: Low-carbon sulfur-based free-cutting Steel (Free-Machining Steel), which significantly enhances cutting efficiency by adding sulfur (S) and a small amount of lead (Pb).
II. Chemical Composition
The core chemical composition design of AISI 1117 aims to optimize the balance between cutting performance and mechanical strength:
Element Content Range (%) Function Carbon (C) 0.14-0.20 Base Strength And Hardness Source Manganese (Mn) 1.00-1.30 Enhances Hardenability And Refines Grains Sulfur (S) 0.08-0.13 Forms Manganese Sulfide Inclusions, Improving Machinability Phosphorus (P) ≤0.040 Control The Impurity Content Lead (Pb) Trace amounts(optional) Further Reduce Tool Wear And Enhance Surface Finish Note: High sulfur content is the key to its machinability, but it may affect weldability (heat input needs to be strictly controlled).
III. Physical and Mechanical Properties
Basic performance- Tensile strength: 490-800 MPa (can reach the upper limit after heat treatment)
- Yield strength: 390-415 MPa
- Elongation: ≥15% (annealed state)
- Hardness: 120 HB (annealed state), and can reach 167-217 HB in cold-drawn state.
Core advantage- Cutting performance: Manganese sulfide inclusions reduce tool friction, support high-speed cutting, and extend tool life.
- Processing adaptability: Suitable for precision processing such as turning, milling and drilling, with high surface finish.
- Heat treatment responsiveness: The performance can be adjusted through processes such as annealing and quenching and tempering (for example, the tensile strength can be increased to 800MPa after quenching and tempering).
IV. Heat Treatment Process
Heat treatment is a key link in optimizing performance:
- Annealing: Hold at 780-820℃ and cool slowly to reduce hardness to 120 HB, enhance plasticity and optimize machinability.
- Quenching and tempering (quenching + tempering) :
- Quenching: Water or oil cooling at 850-880℃ to obtain martensitic structure;
- Tempering: Hold at 500-600℃ to balance strength and toughness.
- Normalizing: Improves the uniformity of the structure and is suitable for subsequent cold working.
V. Application Fields
AISI 1117 is widely used in components that require high-precision cutting and medium loads:
- Mechanical manufacturing: shafts, gears, pins, bolts and other parts that require precision processing.
- Automotive industry: transmission components, braking system parts, steering components.
- Instruments and meters: Wear-resistant parts, carburized parts (surface hardening + core toughness).
- General structural components: non-load-bearing brackets, shelves, agricultural machinery parts.
VI. Precautions for Use
Welding performanceHigh sulfur content is prone to cause hot cracks, and low heat input welding processes (such as gas shielded welding) should be adopted and preheating should be carried out.
Environmental adaptabilityIt has relatively weak corrosion resistance and requires galvanization or painting for protection in exposed environments .
Avoid use in low-temperature (<-40℃) or high-impact scenarios (with limited toughness).
Safety protectionLead-containing versions need to be protected from dust inhalation (protective equipment should be worn during processing).
Summary
The core value of AISI 1117 lies in balancing cutting efficiency and mechanical properties, and it is particularly suitable for precision parts in mass production. Its limitations (such as weldability and corrosion resistance) need to be compensated for through process optimization and surface treatment. When selecting the type, it is necessary to take into account the load, environment and processing requirements, and match heat treatment and protective measures to maximize the potential of the material.
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