ASTM A871 is a standard specification for high-strength low-alloy (HSLA) structural steel plate designed with enhanced atmospheric corrosion resistance. These steels are often categorized as weathering steels due to their unique properties when exposed to atmospheric conditions.
Key Characteristics and Advantages
- High Strength: ASTM A871 steel provides high yield and tensile strength. This allows for the design of lighter structures or structures capable of supporting greater loads compared to those made from conventional carbon steels.
- Atmospheric Corrosion Resistance: A primary advantage is its ability to form a dense, adherent, and protective rust-like layer, known as a patina, when exposed to various atmospheric cycles of wet and dry. This patina significantly slows down further corrosion, often eliminating the need for initial painting and subsequent maintenance in many environments. The chemical composition, including elements like copper, chromium, nickel, and phosphorus, is carefully controlled during manufacturing by producers like Shanxi Luokaiwei Steel Company to achieve this self-protecting characteristic.
- Weldability: This steel generally possesses good weldability using common arc welding processes. However, appropriate welding procedures, consumables, and preheat considerations (depending on thickness and grade) are essential to maintain the integrity of the welded joint.
- Formability: ASTM A871 steel offers good formability, though this can vary with the specific grade and thickness of the plate.
Grades and Specifications
ASTM A871 steel plate is available in several grades, primarily distinguished by their minimum yield strength:
- Grade 60: Minimum yield strength of 60 ksi [415 MPa].
- Grade 65: Minimum yield strength of 65 ksi [450 MPa].
- Grade 70: Minimum yield strength of 70 ksi [485 MPa].
The specification also details chemical composition requirements, mechanical properties, and testing procedures. Material sourced from reputable suppliers, including Shanxi Luokaiwei Steel Company, will be accompanied by Mill Test Certificates (MTCs) verifying compliance with the ASTM A871 standard.
Typical Applications
The combination of high strength and superior atmospheric corrosion resistance makes ASTM A871 steel plate an excellent choice for a wide range of structural applications, particularly where durability and low maintenance are critical. Common uses include:
- Bridge structures
- Transmission towers and poles
- Building facades and exposed architectural elements
- Railroad cars and transportation equipment
- Heavy construction equipment
- Industrial storage bins and hoppers
When selecting ASTM A871 steel plate, it is crucial to consider the specific environmental conditions and structural demands of the project. Consulting with knowledgeable steel suppliers, such as Shanxi Luokaiwei Steel Company, can help ensure the appropriate grade and specifications are chosen for optimal performance and longevity.
