Is it better to forge or cast the crane hook?
2025-07-24 08:35:57
Forging process code for crane hooks
crane hooks must be manufactured using forging technology to ensure material performance and safety specifications. Forging technology can improve the density and mechanical properties of metals, fundamentally ensuring load-bearing safety. This article analyzes the technical advantages, core processes and industry specifications of the forging process, and reveals the scientific logic of banning cast hooks.
1. The essential difference between casting and forging Casting
is formed by liquid metal, which is prone to defects such as pores and shrinkage; forging reshapes the grain structure through solid plastic deformation to form a dense streamlined organization. The metal fibers of the forged hook are distributed along the force direction, and the tensile strength is increased by more than 30%, while the cast hook has an increased stress risk due to the mixed grains.
2. Process map of forged hooks
1. Material selection
uses alloy steels such as DG20Mn and DG34CrMo, with a carbon content of 0.17%-0.24% and a manganese content of 0.7%-1.8%. After normalizing, the tensile strength is ≥785MPa, which has both high strength and impact resistance.
2.Core process
flow Blanking and forming: medium frequency induction heating to 1100-1200℃, forging plastic deformation
Quenching and tempering treatment: quenching + high temperature tempering (550-650℃), hardness HB240-300
Precision control: hook mouth tolerance ≤±0.5mm, hook handle straightness deviation <1mm/m
Non-destructive testing: ultrasonic flaw detection reaches GB/T374015 Level Ⅱ, magnetic particle detection crack sensitivity ≤0.1mm, focus on checking transition zone defects.
3. The underlying logic behind the prohibition of casting
The core reasons why safety regulations prohibit the use of casting hooks:
Uncontrollable structural defects: Casting shrinkage rate 3%-5%
Fatigue life decay: Crack initiation in castings is 4-6 times faster
Emergency repair restrictions: Repair welding of casting defects is strictly prohibited
4. Scrap criteria and safety red lines
Mandatory scrapping standards include:
Dangerous section wear > 10% (micrometer measurement)
Hook mouth torsional deformation > 10° (3D coordinate measuring machine detection)
Plastic deformation > 5% (compared with initial files)
Surface crack > 0.2mm triggers scrapping
5. Technological evolution and industry trends
Intelligent development direction:
Finite element simulation optimization Forging streamline Laser
cladding repair Local wear
Titanium alloy forgings Breakthrough strength/weight ratio
As the foundation of hook manufacturing, the forging process always carries the awe of the material nature and life safety.
crane hooks must be manufactured using forging technology to ensure material performance and safety specifications. Forging technology can improve the density and mechanical properties of metals, fundamentally ensuring load-bearing safety. This article analyzes the technical advantages, core processes and industry specifications of the forging process, and reveals the scientific logic of banning cast hooks.
1. The essential difference between casting and forging Casting
is formed by liquid metal, which is prone to defects such as pores and shrinkage; forging reshapes the grain structure through solid plastic deformation to form a dense streamlined organization. The metal fibers of the forged hook are distributed along the force direction, and the tensile strength is increased by more than 30%, while the cast hook has an increased stress risk due to the mixed grains.
2. Process map of forged hooks
1. Material selection
uses alloy steels such as DG20Mn and DG34CrMo, with a carbon content of 0.17%-0.24% and a manganese content of 0.7%-1.8%. After normalizing, the tensile strength is ≥785MPa, which has both high strength and impact resistance.
2.Core process
flow Blanking and forming: medium frequency induction heating to 1100-1200℃, forging plastic deformation
Quenching and tempering treatment: quenching + high temperature tempering (550-650℃), hardness HB240-300
Precision control: hook mouth tolerance ≤±0.5mm, hook handle straightness deviation <1mm/m
Non-destructive testing: ultrasonic flaw detection reaches GB/T374015 Level Ⅱ, magnetic particle detection crack sensitivity ≤0.1mm, focus on checking transition zone defects.
3. The underlying logic behind the prohibition of casting
The core reasons why safety regulations prohibit the use of casting hooks:
Uncontrollable structural defects: Casting shrinkage rate 3%-5%
Fatigue life decay: Crack initiation in castings is 4-6 times faster
Emergency repair restrictions: Repair welding of casting defects is strictly prohibited
4. Scrap criteria and safety red lines
Mandatory scrapping standards include:
Dangerous section wear > 10% (micrometer measurement)
Hook mouth torsional deformation > 10° (3D coordinate measuring machine detection)
Plastic deformation > 5% (compared with initial files)
Surface crack > 0.2mm triggers scrapping
5. Technological evolution and industry trends
Intelligent development direction:
Finite element simulation optimization Forging streamline Laser
cladding repair Local wear
Titanium alloy forgings Breakthrough strength/weight ratio
As the foundation of hook manufacturing, the forging process always carries the awe of the material nature and life safety.
Forging process code for crane hooks
Crane hooks must be manufactured using forging technology to ensure material performance and safety specifications. Forging technology can improve the density and mechanical properties of metals, fundamentally ensuring load-bearing safety. This article analyzes the technical advantages, core processes and industry specifications of the forging process, and reveals the scientific logic of banning cast hooks.
1. The essential difference between casting and forging Casting
is formed by liquid metal, which is prone to defects such as pores and shrinkage; forging reshapes the grain structure through solid plastic deformation to form a dense streamlined organization. The metal fibers of the forged hook are distributed along the force direction, and the tensile strength is increased by more than 30%, while the cast hook has an increased stress risk due to the mixed grains.
2. Process map of forged hooks
1. Material selection
uses alloy steels such as DG20Mn and DG34CrMo, with a carbon content of 0.17%-0.24% and a manganese content of 0.7%-1.8%. After normalizing, the tensile strength is ≥785MPa, which has both high strength and impact resistance.
2.Core process
flow Blanking and forming: medium frequency induction heating to 1100-1200℃, forging plastic deformation
Quenching and tempering treatment: quenching + high temperature tempering (550-650℃), hardness HB240-300
Precision control: hook mouth tolerance ≤±0.5mm, hook handle straightness deviation <1mm/m
Non-destructive testing: ultrasonic flaw detection reaches GB/T374015 Level Ⅱ, magnetic particle detection crack sensitivity ≤0.1mm, focus on checking transition zone defects.
3. The underlying logic behind the prohibition of casting
The core reasons why safety regulations prohibit the use of casting hooks:
Uncontrollable structural defects: Casting shrinkage rate 3%-5%
Fatigue life decay: Crack initiation in castings is 4-6 times faster
Emergency repair restrictions: Repair welding of casting defects is strictly prohibited
4. Scrap criteria and safety red lines
Mandatory scrapping standards include:
Dangerous section wear > 10% (micrometer measurement)
Hook mouth torsional deformation > 10° (3D coordinate measuring machine detection)
Plastic deformation > 5% (compared with initial files)
Surface crack > 0.2mm triggers scrapping
5. Technological evolution and industry trends
Intelligent development direction:
Finite element simulation optimization Forging streamline Laser
cladding repair Local wear
Titanium alloy forgings Breakthrough strength/weight ratio
As the foundation of hook manufacturing, the forging process always carries the awe of the material nature and life safety.
Crane hooks must be manufactured using forging technology to ensure material performance and safety specifications. Forging technology can improve the density and mechanical properties of metals, fundamentally ensuring load-bearing safety. This article analyzes the technical advantages, core processes and industry specifications of the forging process, and reveals the scientific logic of banning cast hooks.
1. The essential difference between casting and forging Casting
is formed by liquid metal, which is prone to defects such as pores and shrinkage; forging reshapes the grain structure through solid plastic deformation to form a dense streamlined organization. The metal fibers of the forged hook are distributed along the force direction, and the tensile strength is increased by more than 30%, while the cast hook has an increased stress risk due to the mixed grains.
2. Process map of forged hooks
1. Material selection
uses alloy steels such as DG20Mn and DG34CrMo, with a carbon content of 0.17%-0.24% and a manganese content of 0.7%-1.8%. After normalizing, the tensile strength is ≥785MPa, which has both high strength and impact resistance.
2.Core process
flow Blanking and forming: medium frequency induction heating to 1100-1200℃, forging plastic deformation
Quenching and tempering treatment: quenching + high temperature tempering (550-650℃), hardness HB240-300
Precision control: hook mouth tolerance ≤±0.5mm, hook handle straightness deviation <1mm/m
Non-destructive testing: ultrasonic flaw detection reaches GB/T374015 Level Ⅱ, magnetic particle detection crack sensitivity ≤0.1mm, focus on checking transition zone defects.
3. The underlying logic behind the prohibition of casting
The core reasons why safety regulations prohibit the use of casting hooks:
Uncontrollable structural defects: Casting shrinkage rate 3%-5%
Fatigue life decay: Crack initiation in castings is 4-6 times faster
Emergency repair restrictions: Repair welding of casting defects is strictly prohibited
4. Scrap criteria and safety red lines
Mandatory scrapping standards include:
Dangerous section wear > 10% (micrometer measurement)
Hook mouth torsional deformation > 10° (3D coordinate measuring machine detection)
Plastic deformation > 5% (compared with initial files)
Surface crack > 0.2mm triggers scrapping
5. Technological evolution and industry trends
Intelligent development direction:
Finite element simulation optimization Forging streamline Laser
cladding repair Local wear
Titanium alloy forgings Breakthrough strength/weight ratio
As the foundation of hook manufacturing, the forging process always carries the awe of the material nature and life safety.
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