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ASTM A193 B16 Screw
QS Fastener: ASTM A193 B16 Screw
Name: ASTM A193 B16 Screw
Standard: ASTM
Material: A193 B16
Size: 1/2 to 4 inch
Total Length: 30 to 1000mm
Thread: UNC
Grade: 8.8
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Standard: ASTM
Material: A193 B16
Size: 1/2 to 4 inch
Total Length: 30 to 1000mm
Thread: UNC
Grade: 8.8
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Quantity
The ASTM A193 B16 Screw is a high-strength fastener compliant with ASTM standards, made from A193 B16 material, with specifications ranging from 1/2 to 4 inches and lengths from 30 to 1000 mm, featuring UNC thread design. This screw is suitable for high-load and demanding working conditions, widely used in oil pipelines, mechanical equipment, the chemical industry, and construction, providing reliable, durable, and high-performance connections.
High-Strength Characteristics and Manufacturing Process of ASTM A193 B16 Screw
1. Material Properties and Standards
The ASTM A193 B16 Screw is made from A193 B16 material, a chromium-molybdenum alloy steel known for its excellent strength, toughness, and corrosion resistance. Its chemical composition and mechanical properties are strictly controlled in accordance with ASTM A193 standards, ensuring stability under high-temperature, high-pressure, and demanding conditions.
1. Material Properties and Standards
The ASTM A193 B16 Screw is made from A193 B16 material, a chromium-molybdenum alloy steel known for its excellent strength, toughness, and corrosion resistance. Its chemical composition and mechanical properties are strictly controlled in accordance with ASTM A193 standards, ensuring stability under high-temperature, high-pressure, and demanding conditions.
2. Heat Treatment Process
Heat treatment is the core process for enhancing the strength of the ASTM A193 B16 Screw, primarily consisting of two key steps: quenching and tempering.
Heat treatment is the core process for enhancing the strength of the ASTM A193 B16 Screw, primarily consisting of two key steps: quenching and tempering.
Quenching:
The screws are heated to a high temperature of 850°C to 900°C to fully austenitize their structure, followed by rapid cooling (typically using oil or water quenching). This process forms a high-hardness martensitic structure, laying the foundation for subsequent tempering.
The screws are heated to a high temperature of 850°C to 900°C to fully austenitize their structure, followed by rapid cooling (typically using oil or water quenching). This process forms a high-hardness martensitic structure, laying the foundation for subsequent tempering.
Tempering:
After quenching, the screws are tempered at temperatures between 550°C and 650°C. The primary purpose of tempering is to reduce material brittleness while adjusting hardness and toughness to achieve a uniform microstructure. This step significantly improves the screw’s overall mechanical properties, ensuring high strength along with excellent toughness and fatigue resistance.
After quenching, the screws are tempered at temperatures between 550°C and 650°C. The primary purpose of tempering is to reduce material brittleness while adjusting hardness and toughness to achieve a uniform microstructure. This step significantly improves the screw’s overall mechanical properties, ensuring high strength along with excellent toughness and fatigue resistance.
3. Mechanical Properties
Through heat treatment and tempering processes, the ASTM A193 B16 Screw achieves the following mechanical properties:
Through heat treatment and tempering processes, the ASTM A193 B16 Screw achieves the following mechanical properties:
Tensile Strength: ≥ 830 MPa
Tensile strength is a critical indicator of a material’s resistance to fracture. High tensile strength ensures the screw’s reliability under high loads.
Tensile strength is a critical indicator of a material’s resistance to fracture. High tensile strength ensures the screw’s reliability under high loads.
Yield Strength: ≥ 690 MPa
Yield strength indicates the maximum stress a material can withstand before permanent deformation. High yield strength ensures the screw maintains shape stability under high stress.
Yield strength indicates the maximum stress a material can withstand before permanent deformation. High yield strength ensures the screw maintains shape stability under high stress.
Hardness: 22 to 30 HRC (Rockwell Hardness)
The moderate hardness range ensures the screw combines high strength with excellent toughness and impact resistance.
The moderate hardness range ensures the screw combines high strength with excellent toughness and impact resistance.
4. Advantages of the Tempering Process
The tempering process (quenching + tempering) not only enhances the strength and hardness of the ASTM A193 B16 Screw but also significantly improves its toughness and fatigue resistance:
The tempering process (quenching + tempering) not only enhances the strength and hardness of the ASTM A193 B16 Screw but also significantly improves its toughness and fatigue resistance:
Toughness:
Through tempering, the screw’s toughness is optimized, enabling it to withstand dynamic and impact stresses while avoiding brittle fracture.
Through tempering, the screw’s toughness is optimized, enabling it to withstand dynamic and impact stresses while avoiding brittle fracture.
Fatigue Resistance:
The tempering process refines the material’s microstructure, reducing internal defects and thereby extending the screw’s service life under cyclic loads.
The tempering process refines the material’s microstructure, reducing internal defects and thereby extending the screw’s service life under cyclic loads.
5. Applications
The high-strength characteristics of the ASTM A193 B16 Screw make it an ideal choice for the following applications:
The high-strength characteristics of the ASTM A193 B16 Screw make it an ideal choice for the following applications:
Oil Pipelines:
In high-temperature, high-pressure oil and gas transportation environments, the screw provides reliable sealing and connections.
In high-temperature, high-pressure oil and gas transportation environments, the screw provides reliable sealing and connections.
Mechanical Equipment:
Suitable for high-load, high-speed mechanical connections, ensuring operational stability and safety.
Suitable for high-load, high-speed mechanical connections, ensuring operational stability and safety.
Chemical Industry:
In corrosive environments, the screw’s high corrosion resistance extends its service life.
In corrosive environments, the screw’s high corrosion resistance extends its service life.
Construction Industry:
Used in steel structure connections, meeting high-strength and seismic requirements.
Used in steel structure connections, meeting high-strength and seismic requirements.
The ASTM A193 B16 Screw, through rigorous heat treatment and tempering processes, achieves high strength, toughness, and excellent fatigue resistance. Its tensile strength, yield strength, and hardness meet or exceed ASTM standard requirements, making it the fastener of choice for high-load and high-stress environments. Whether in oil, chemical, mechanical, or construction industries, the ASTM A193 B16 Screw demonstrates exceptional performance and reliability, providing robust support for various demanding working conditions.
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