A4-70 Stainless Steel Hex metal bolts M20 High Strength and Durability for Extreme Environments
Product Description:
The M24 M27 Stainless Steel Hex Heavy Metal Bolt Nut Washer A4-70 SS316L Corrosion-Resistant is a high-performance fastener designed for use in industries requiring robust and durable components that can withstand challenging environmental conditions. This fastener system is typically employed in demanding applications such as marine, chemical, and industrial settings, where corrosion resistance and mechanical strength are paramount. To understand its importance and functionality, it is essential to explore the components, materials, and benefits of such a fastening solution.
Material and Corrosion Resistance
The A4-70 grade designation in this headline refers to a high-strength, corrosion-resistant stainless steel composition, ensuring these fasteners perform well in challenging environments. The M24 and M27 bolts, nuts, and washers have been designed to withstand mechanical stress, making them suitable for heavy-duty structural and industrial applications. Their high tensile strength (700 MPa yield strength) means they can bear significant loads without failure, making them perfect for critical installations, especially in extreme conditions like offshore rigs or chemical plants where both strength and durability are essential.
Maintenance Tips:
• Regularly check bolts for any signs of loosening, particularly in high-vibration environments.
• Clean bolts with water or a mild detergent to remove any salt or chemical deposits that may accelerate corrosion.
• For applications exposed to extreme chemicals, apply a protective coating to further enhance the bolt’s resistance.
Applications
Stainless steel bolts grade, A2 and A4 represent different material classification, A2 means austenitic steel group II, usually use 304 stainless steel material, A4 represents 316L stainless steel. Here, ‘50’ and ‘70’ represent the performance level of the product, specifically 1/10 of the nominal tensile strength, for example, A2-70 means that the tensile strength is 700MPa.
In the classification of stainless steel, A1 to A5 groups are different according to the different chemical compositions, and this information can be found in Appendix B of GB/T3098.6-2000 standard.
It is worth noting that A2-70 represents austenitic steel, which is cold worked and has a minimum tensile strength of 700 MPa. this material is widely used in the chemical industry, food processing, and medical equipment due to its good corrosion resistance and formability.
A4-70 stands for 316L stainless steel, which is also cold-worked and has excellent corrosion resistance, especially in environments containing chloride ions. This material is commonly used in the manufacture of seawater treatment equipment, ships and medical devices.
In contrast, A2-50 and A4-50 represent lower tensile strength austenitic steel and 316L stainless steel, which have tensile strengths of 500 MPa and 500 MPa, respectively. despite their lower strengths, they still have irreplaceable advantages in certain specific applications, such as decorative parts and light structural parts.
In summary, the differences between A2-70, A4-70, A2-50 and A4-50 stainless steel bolts are mainly reflected in the tensile strength, type of material and applicable scenarios, and the selection of the right type of stainless steel bolts is essential to ensure the safety and reliability of mechanical equipment.
| No. | C% | Cr% | Ni % | Mo % |
| 304 | 0.07 | 17.5-19.5 | 8.0-10.5 | / |
| 316 | 0.08 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 |
| 301 | 0.15 | 16.0-18.1 | 6-8 | / |
| 310 | 0.08 | 24-26 | 19-22 | / |
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