Understanding Stainless Steel Hex Bolts
When it comes to construction, manufacturing, or marine projects, the humble hex bolt plays a pivotal role, yet not all…
In the world of industrial fasteners, the A2-70 stainless steel bolt stands out as a paragon of strength, durability, and corrosion resistance. Whether you’re an engineer overseeing a critical infrastructure project or a procurement manager navigating the complexities of the global supply chain, understanding the full spectrum of these bolts’ capabilities is essential. This comprehensive guide delves into the detailed specifications of A2-70 stainless steel bolts, shedding light on their impressive tensile and yield strengths, as well as their unparalleled resistance to environmental wear and tear. Beyond the technical details, we also explore current market prices, offering insights into cost-effective procurement strategies and international price comparisons. Additionally, we’ll highlight the industries where these bolts are indispensable, from construction to the oil and gas sector, and introduce you to leading manufacturers and suppliers. By the end of this guide, you’ll have a thorough understanding of how to select, use, and maximize the benefits of A2-70 stainless steel bolts for your specific needs.
A2-70 stainless steel bolts are primarily made of chromium (about 18%) and nickel (around 8%), with smaller amounts of manganese, silicon, and carbon. This specific composition enhances their resistance to corrosion and mechanical strength, making them suitable for a wide range of applications.
A2-70 bolts boast a tensile strength of 700 MPa and a yield strength of 450 MPa, ensuring they can withstand significant stress without deforming. Additionally, they can endure temperatures up to 300°C without compromising their mechanical properties. This combination of strength and temperature tolerance makes them ideal for demanding environments.
These bolts are non-magnetic due to their austenitic structure, which is important in applications where magnetic interference must be minimized.
A2-70 stainless steel bolts are utilized across various industries due to their durability and resistance to environmental factors. They are commonly used in:
In summary, A2-70 stainless steel bolts stand out as a reliable and versatile fastening solution. Their superior corrosion resistance, high mechanical strength, and adaptability across various industries make them an indispensable choice for numerous applications.
A2-70 stainless steel bolts are renowned for their impressive mechanical properties, particularly in terms of tensile and yield strength.
Tensile strength measures how much stress a material can endure when stretched or pulled until it breaks. For A2-70 stainless steel bolts, the minimum tensile strength is 700 MPa. This high tensile strength ensures that these bolts can endure substantial loads without failing, making them suitable for high-stress applications.
Yield strength refers to the stress at which a material begins to deform plastically. Beyond this point, the material will not return to its original shape. A2-70 stainless steel bolts have a yield strength of approximately 450 MPa. This property is crucial for applications where the bolts must maintain their structural integrity under heavy loads.
One of the most impressive features of A2-70 stainless steel bolts is their ability to resist corrosion, making them ideal for challenging environments.
The austenitic stainless steel composition, primarily made of chromium and nickel, provides inherent resistance to rust and corrosion. The chromium forms a passive layer of chromium oxide on the surface, preventing further corrosion by blocking oxygen diffusion to the steel surface. This layer is self-healing if damaged, ensuring long-term durability.
Due to their superior corrosion resistance, A2-70 stainless steel bolts are widely used in marine environments, chemical processing plants, and outdoor construction where exposure to rain and humidity is frequent. They are also preferred in industries like food and beverage, where hygiene and resistance to acidic substances are essential.
The physical and thermal properties of A2-70 stainless steel bolts further enhance their suitability for various applications.
These bolts are composed of a balanced mix of carbon, manganese, phosphorus, sulfur, silicon, chromium, and nickel, which contribute to their strength and corrosion resistance.
The manufacturing process and heat treatment of A2-70 stainless steel bolts are crucial to their performance.
These bolts are typically manufactured using cold forging, CNC machining, and hot forging techniques. These processes ensure precision and strength.
The bolts undergo solution annealing at temperatures between 1010 and 1120°C, followed by liquid quenching. This heat treatment process enhances their mechanical properties and corrosion resistance.
A2-70 stainless steel bolts are known for their excellent forming and welding characteristics. This makes them versatile for various applications where customization and adaptability are required. Their robust mechanical properties, coupled with high corrosion resistance, make them indispensable in multiple industries.
In summary, A2-70 stainless steel bolts offer a remarkable combination of strength, corrosion resistance, and versatility, making them a top choice for various industrial applications.
The price of A2-70 stainless steel bolts depends on factors like region, manufacturer, and product type. For example, the average market price of these bolts is around $6.42 per kg (USD), €6.12 per kg (Euro), and 22.46 UAE Dirham per kg. Hex bolts in this grade are priced slightly lower, at approximately $5.52 per kg (USD), €5.27 per kg (Euro), and 19.15 UAE Dirham per kg. Square nuts of the same grade are even more economical, costing about $3.52 per kg (USD), €3.34 per kg (Euro), and 11.82 UAE Dirham per kg.
A2-70 stainless steel bolts are generally priced higher than carbon steel bolts such as Grade 8.8. This is mainly because they have better corrosion resistance and are made from an alloy containing chromium and nickel. While the initial investment may be higher, the enhanced durability and reduced maintenance costs can make them a more economically sound choice over time.
Even though A2-70 bolts are more expensive than carbon steel, their durability and performance in corrosive environments make them cost-effective in the long run, as they reduce maintenance costs.
Choosing between A2-70 and other materials like Grade 8.8 carbon steel depends on the specific needs of the application. For environments where corrosion resistance is paramount, A2-70 is an excellent choice. Conversely, for heavy-duty applications that prioritize tensile strength over corrosion resistance, Grade 8.8 bolts may present a more economical alternative despite their lower resistance to environmental factors.
When evaluating the global market, price variations can be observed across different currencies and regions. Understanding these differences is crucial for procurement strategies, especially for international projects. By comparing prices in USD and Euro, businesses can better assess where to source materials based on current exchange rates and regional pricing trends. This approach helps in optimizing costs and ensuring competitive pricing in various markets.
A2-70 stainless steel bolts play a crucial role in the construction industry, especially in projects demanding high tensile strength and excellent corrosion resistance. These bolts are commonly used in assembling structural frameworks, bridges, and high-rise buildings, where their resistance to harsh weather conditions makes them ideal for outdoor and coastal projects. Their non-magnetic properties are also beneficial in settings like hospitals and laboratories, where magnetic interference could be problematic.
In the oil and gas industry, A2-70 stainless steel bolts are essential for their durability and corrosion resistance. They are commonly used in offshore drilling rigs, pipelines, and refineries to withstand saltwater, chemicals, and high pressures. The bolts’ high tensile and yield strengths ensure they maintain structural integrity under the demanding conditions typical of oil and gas extraction and processing operations.
A2-70 bolts are widely used in manufacturing and maintaining machinery, thanks to their high tensile strength and durability. They are vital in industrial machinery such as manufacturing equipment, agricultural machinery, and heavy-duty vehicles. Their reliability in high-stress environments ensures that machinery operates safely and efficiently, reducing the risk of mechanical failures and downtime.
Beyond construction and oil and gas, A2-70 stainless steel bolts find applications in a wide range of other industrial settings. They are commonly used in the automotive industry for assembling engines, exhaust systems, and chassis components. Their resistance to heat and corrosion makes them suitable for high-performance automotive applications. Additionally, they are employed in the aerospace industry, where both mechanical strength and lightweight properties are crucial. The food and beverage industry also benefits from these bolts’ corrosion resistance, particularly in environments where hygiene and exposure to acidic substances are critical.
The versatility and reliability of A2-70 stainless steel bolts highlight their importance in modern engineering and manufacturing, making them a preferred choice for applications requiring both strength and corrosion resistance. Their consistent performance in demanding environments underscores their value across various industries, ensuring safety and efficiency in numerous high-stress applications.
Ranflex Metals specializes in A2-70 stainless steel screws and bolts, known for their high toughness, durability, and corrosion resistance. They offer a variety of shapes, sizes, and dimensions tailored to meet both national and international standards. Their ability to customize bolts according to specific requirements makes them a top choice for many industries.
Viha Steel & Forging is a leading manufacturer and supplier of A2-70 hex head bolts. Made from 304 austenitic stainless steel, their products are cost-effective, strong, and highly resistant to corrosion. With a size range from ¼ inches to 24 inches, Viha Steel & Forging caters to a wide array of industrial needs, providing high-quality bolts for various applications.
Great Steel & Metals manufactures A2-70 bolts from 304 or 304L raw materials. These acid-proof austenitic stainless steel bolts are mostly non-magnetic but can become magnetic when cold worked. They offer a comprehensive range of sizes and dimensions, adhering to both imperial and metric standards, making them a reliable supplier for diverse industrial requirements.
Big Bolt Nut is known for producing ISO 3506-1 Grade A2-70 stainless steel fasteners like hex bolts, screws, stud bolts, and fully threaded studs. Their A2-70 fasteners, made from SS 304 grade, have an ultimate tensile strength of 700 N/mm². The company’s commitment to quality and precision manufacturing techniques positions them as a top supplier in the global market.
Chinese suppliers are also significant players in the global market for A2-70 stainless steel bolts. Companies such as Shanghai Metal Corporation and Jignesh Steel provide a wide range of A2-70 bolts, known for their competitive pricing and adherence to international quality standards. These suppliers offer extensive catalogs, catering to diverse industrial needs and ensuring timely delivery and robust customer support.
When choosing a supplier for A2-70 stainless steel bolts, keep these factors in mind:
By considering these factors, businesses can find the best manufacturers and suppliers, ensuring they get high-quality and reliable A2-70 stainless steel bolts for their needs.
Choosing the right size of A2-70 stainless steel bolts is essential for optimal performance in different applications. These bolts come in both metric and imperial sizes to accommodate various requirements.
A2-70 stainless steel bolts are available in:
This variety ensures that you can find the perfect fit for any project, adhering to either international standards or local preferences.
Applying the correct torque is crucial when installing A2-70 stainless steel bolts. Over-tightening can cause bolt failure, while under-tightening may lead to weak clamping.
These torque values ensure that the bolts are tightened just right, maintaining the structural integrity and performance of your assembly.
Both metric and imperial size options cater to different regional standards and application needs. Metric sizes are commonly used internationally, especially in Europe and Asia, while imperial sizes are preferred in the United States and some other regions.
When choosing A2-70 bolts, consider the head type and drive option based on your application needs.
By carefully selecting the appropriate size, torque, head type, and drive option, you can ensure that your A2-70 stainless steel bolts deliver both functionality and durability for any project.
Selecting the right grade and preparing materials properly are essential for the optimal performance of A2-70 stainless steel bolts. Made from AISI 304 or 304L, these bolts offer excellent corrosion resistance and should be stored in a dry, clean environment to prevent contamination before installation.
Use the proper tightening torque to prevent thread damage or bolt failure. For example, an M4 bolt needs a torque between 0.2 and 0.45 Nm, depending on friction. Utilizing a calibrated torque wrench ensures precision and prevents over-tightening.
Keep the recommended preload values to ensure proper clamping without surpassing the breaking torque. For instance, an M4 bolt should have a preload of about 0.55 kN and a minimum breaking torque of 3.8 Nm. This balance ensures that the bolt remains secure under operational loads.
Enhance the corrosion resistance and longevity of A2-70 bolts with surface coatings like galvanization or other specialized options suited to specific environments. Ensure the chosen coating is compatible with the intended application to maximize effectiveness.
Ensure that threads are clean and free from debris to prevent cross-threading. Use compatible nuts and washers, such as nyloc nuts or other locking mechanisms, to enhance fastening security. This compatibility minimizes the risk of thread stripping and ensures a stable connection.
Use A2-70 bolts in temperatures between 15°C and 25°C. Avoid exceeding this range to preserve their mechanical properties and prevent early failure.
If applicable, ensure that bolts undergo proper solution annealing at temperatures between 1010 and 1120°C. This process enhances their mechanical properties and corrosion resistance, crucial for applications in harsh environments.
Regularly inspect A2-70 bolts for signs of wear, corrosion, or fatigue. Periodic maintenance checks ensure that bolts maintain their integrity and functionality, particularly in high-stress or corrosive environments. Replace any damaged or worn bolts promptly to prevent system failures.
By adhering to these best practices, users can ensure the reliable and effective use of A2-70 stainless steel bolts in various applications, maximizing their performance and lifespan.
Below are answers to some frequently asked questions:
A2-70 stainless steel bolts are made from austenitic stainless steel, typically AISI 304 or 304L, offering a minimum tensile strength of 700 MPa and yield strength around 450 MPa. These bolts are known for their good corrosion resistance, elongation between 40% to 45%, and hardness up to 15 HRC. Available in metric sizes from M1.2 to M48 and imperial sizes from 1/4" to 4", they are manufactured using cold forging, CNC machining, and hot forging techniques. Adhering to standards like ISO 3506-1 and ASTM A193, A2-70 bolts are widely used in various industries for their reliable mechanical and physical properties.
The current market prices for A2-70 Stainless Steel Bolts vary based on factors such as size, quantity, and specific application. Generally, prices per kilogram range from approximately $5.52 to $6.42 USD, while individual pieces like an M8 full threaded DIN931 hex head bolt can cost between $0.1 to $100 USD. Bulk orders, such as stainless steel U bolts for pipes, are priced around $1000-2000 per ton. Additional costs may apply for surface coatings and specific manufacturing requirements, influencing the overall price.
A2-70 Stainless Steel Bolts are commonly utilized in various industries due to their high tensile strength and excellent corrosion resistance. Key industries include construction, where they are valued for their durability; the oil and gas sector, where their resistance to harsh environments is crucial; the marine industry, benefiting from their corrosion-resistant properties; and power generation, where their strength and reliability are essential. Additionally, they are used in the machinery and automotive sectors for their robust performance, and in specialized applications such as wind towers, nuclear power plants, railways, and electronics, where safety and integrity are paramount.
Top manufacturers and suppliers of A2-70 stainless steel bolts include Ranflex Metals, Stainless Steel Fasteners (StainlessSteelfasteners.net), Dalloyed Fasteners, Great Steel & Metals, and Big Bolt Nut. These companies are renowned for their high-quality products, extensive range of sizes, and adherence to international standards. They offer various fasteners, including hex bolts, Allen bolts, and stud bolts, known for their durability and corrosion resistance. Each supplier provides competitive pricing and detailed specifications to meet diverse industrial requirements, making them reliable choices for sourcing A2-70 stainless steel bolts.
When selecting the right size and dimension for A2-70 Stainless Steel Bolts, consider the bolt’s diameter, length, thread type, and the required tensile and yield strength. Ensure the bolt fits within the pre-drilled holes and matches the application’s load requirements. Refer to specific torque charts for proper tightening and choose the appropriate head type and drive based on the tools available. Compliance with dimensional standards like ASME, JIS, and ISO ensures compatibility. By assessing these factors, you can ensure the bolts meet your application’s needs effectively, as discussed earlier in the article.
