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Putian Carbon Steel Bolt
QS Fastener: Putian Carbon Steel Bolt
Name: Putian Carbon Steel Bolt
Standard: ASTM
Material: A193 B7
Size: 1/2 inch
Lenght: 120 mm
Surface: Galvanization
Feature: High Strength
Standard: ASTM
Material: A193 B7
Size: 1/2 inch
Lenght: 120 mm
Surface: Galvanization
Feature: High Strength
Quantity
This Carbon Steel Bolt is made of ASTM A193 B7 alloy steel, with a specification of 1/2 inch and a length of 120 mm. Dimensions can be customized according to customer requirements. The product features a zinc-plated surface treatment, offering excellent high strength and corrosion resistance. It is suitable for critical connections in high-pressure and high-temperature environments, meeting the reliability requirements for fasteners under demanding working conditions.
What is a Carbon Steel Bolt?
A Carbon Steel Bolt refers to a fastener made from carbon steel as the raw material, manufactured through processes such as cold heading, hot forging, and turning.
As a common type of Bolt, it is widely used in industrial machinery, construction engineering, automotive manufacturing, and other fields.
A Carbon Steel Bolt refers to a fastener made from carbon steel as the raw material, manufactured through processes such as cold heading, hot forging, and turning.
As a common type of Bolt, it is widely used in industrial machinery, construction engineering, automotive manufacturing, and other fields.
1. Material Composition
The main components of carbon steel are iron and carbon (with carbon content typically ranging from 0.08% to 0.65%), along with small amounts of impurities such as manganese, silicon, sulfur, and phosphorus.
The main components of carbon steel are iron and carbon (with carbon content typically ranging from 0.08% to 0.65%), along with small amounts of impurities such as manganese, silicon, sulfur, and phosphorus.
Depending on carbon content, Carbon Steel Bolt is generally classified into:
- Low Carbon Steel (commonly used for grades below 10.9): e.g., A3 steel, 10#, 20# steel. It offers good plasticity and workability but relatively lower strength. Typically used for in grades 4.8 and 6.8.
- Medium Carbon Steel (commonly used for grade 8.8): e.g., 35#, 45# steel. After quenching and tempering, it achieves excellent comprehensive mechanical properties and is the main material for high-strength Carbon Steel Bolt (grade 8.8).
- High Carbon Steel: High carbon content offers high hardness but increased brittleness. It is rarely used for manufacturing bolt bodies in standard fasteners and is more commonly found in washers or special wear-resistant components.
- Medium Carbon Steel (commonly used for grade 8.8): e.g., 35#, 45# steel. After quenching and tempering, it achieves excellent comprehensive mechanical properties and is the main material for high-strength Carbon Steel Bolt (grade 8.8).
- High Carbon Steel: High carbon content offers high hardness but increased brittleness. It is rarely used for manufacturing bolt bodies in standard fasteners and is more commonly found in washers or special wear-resistant components.
2. Performance Grades
A notable feature of Carbon Steel Bolt is the distinction of strength by performance grades. The numbers stamped on the bolt head, such as 4.8, 8.8, 10.9, and 12.9, indicate:
A notable feature of Carbon Steel Bolt is the distinction of strength by performance grades. The numbers stamped on the bolt head, such as 4.8, 8.8, 10.9, and 12.9, indicate:
- Ordinary Bolts: Typically refer to grades 4.8 and 6.8. Made from low carbon steel, they generally undergo no heat treatment or only simple processing.
- High-Strength Bolts: Typically refer to grades 8.8 and above (8.8, 10.9, 12.9). Made from medium carbon steel or alloy steel (e.g., 40Cr, 35CrMo) and processed through heat treatment (quenching and tempering). It is important to note that not every Carbon Steel Bolt qualifies as a high-strength bolt; only those that have undergone heat treatment to achieve grade 8.8 or above are considered high-strength.
- High-Strength Bolts: Typically refer to grades 8.8 and above (8.8, 10.9, 12.9). Made from medium carbon steel or alloy steel (e.g., 40Cr, 35CrMo) and processed through heat treatment (quenching and tempering). It is important to note that not every Carbon Steel Bolt qualifies as a high-strength bolt; only those that have undergone heat treatment to achieve grade 8.8 or above are considered high-strength.
3. Advantages and Disadvantages
Advantages:
- Low Cost: Abundant raw materials make the price significantly lower than Bolt made of stainless steel, copper, titanium, and other materials.
- High Strength: After heat treatment, medium Carbon Steel Bolt can achieve strength grades of 10.9 or 12.9, far exceeding the strength of ordinary stainless steel bolts (typically equivalent to grades 6.8–8.8).
- Good Workability: Suitable for high-volume cold heading, offering high production efficiency.
Advantages:
- Low Cost: Abundant raw materials make the price significantly lower than Bolt made of stainless steel, copper, titanium, and other materials.
- High Strength: After heat treatment, medium Carbon Steel Bolt can achieve strength grades of 10.9 or 12.9, far exceeding the strength of ordinary stainless steel bolts (typically equivalent to grades 6.8–8.8).
- Good Workability: Suitable for high-volume cold heading, offering high production efficiency.
Disadvantages:
- Poor Corrosion Resistance: This is the biggest drawback of Carbon Steel Bolt. Ordinary carbon steel bolts are highly prone to rust. When exposed to humid air, rain, or corrosive environments, they quickly develop red rust, which can lead to seizing, breakage, or difficulty in disassembly.
- Solutions: To prevent rust, Carbon Steel Bolt used in industrial applications almost always require surface treatment. Common surface treatments include:
- Electroplating (e.g., zinc plating, nickel plating, chrome plating): Provides a bright finish, moderate cost, and general corrosion resistance.
- Hot-Dip Galvanizing: Offers a thick coating and strong corrosion resistance, commonly used in outdoor applications such as power transmission and highway barriers.
- Dacromet: Provides excellent salt spray resistance, is environmentally friendly, and resists high temperatures, commonly used in automotive, wind power, and other industries.
- Poor Corrosion Resistance: This is the biggest drawback of Carbon Steel Bolt. Ordinary carbon steel bolts are highly prone to rust. When exposed to humid air, rain, or corrosive environments, they quickly develop red rust, which can lead to seizing, breakage, or difficulty in disassembly.
- Solutions: To prevent rust, Carbon Steel Bolt used in industrial applications almost always require surface treatment. Common surface treatments include:
- Electroplating (e.g., zinc plating, nickel plating, chrome plating): Provides a bright finish, moderate cost, and general corrosion resistance.
- Hot-Dip Galvanizing: Offers a thick coating and strong corrosion resistance, commonly used in outdoor applications such as power transmission and highway barriers.
- Dacromet: Provides excellent salt spray resistance, is environmentally friendly, and resists high temperatures, commonly used in automotive, wind power, and other industries.
4. Application Scenarios
Due to its low cost and high strength, Carbon Steel Bolt is found almost everywhere:
Due to its low cost and high strength, Carbon Steel Bolt is found almost everywhere:
- Steel Structure Buildings and Bridges: High-strength Carbon Steel Bolt of grade 10.9 or 8.8 (typically hot-dip galvanized or black oxide finished) is used for structural connections.
- Automotive and Heavy Machinery: Critical areas such as engines, chassis, and frames mostly use Carbon Steel Bolt of grade 10.9 or 12.9 to withstand significant shear and tensile forces.
- General Mechanical Equipment: Grade 4.8 or 8.8 zinc-plated Carbon Steel Bolt is standard for equipment assembly.
- Automotive and Heavy Machinery: Critical areas such as engines, chassis, and frames mostly use Carbon Steel Bolt of grade 10.9 or 12.9 to withstand significant shear and tensile forces.
- General Mechanical Equipment: Grade 4.8 or 8.8 zinc-plated Carbon Steel Bolt is standard for equipment assembly.
If you need fasteners that are cost-effective and capable of withstanding significant tensile or shear forces, Carbon Steel Bolt (especially in high-strength grades) is the best choice. However, if the application involves prolonged exposure to humid or corrosive environments and requires aesthetic appearance without rust, stainless steel bolts or Carbon Steel Bolt with specialized anti-corrosion treatment will be more suitable.
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