SA516Gr60 material, SA516Gr70, SA516Gr60N, SA516Gr70N steel plate in thickness ≤1.5in (40mm) is usually supplied in rolled state. The plate can also be ordered according to normalizing or stress relief, or normalizing plus stress relief. SA516Gr60 steel plate when thickness> 1.5in. (40mm) should be normalized. Unless otherwise specified by the customer, A709 grade 50 high strength steel, SA516Gr60 steel plate (thickness ≤40mm) should be normalized when there is a notch toughness requirement.
Zhengzhou BBN steel company was established in 2000. After more than ten years of development, it has formed a professional operation pattern integrating R&D, production, sales and after-sales service. In recent years, A709 grade 50 high strength steel based on a high starting point and high technology, the company has vigorously developed various steel products A709 grade 50 high strength steel and deep-processed parts, steel structures, precision castings, seamless pipes.
Try to use A709 grade 50 high strength steel high-quality alkaline covered electrode as much as possible, and don't use inferior electrode to save money. According to the theory of chromium poor, chromium carbide will be precipitated on the upper edge of the grain boundary of the weld and heat affected zone when the A709 grade 50 high strength steel temperature range is between 450 ℃ and 850 ℃, resulting in chromium poor grain boundary, which is insufficient to resist corrosion.
Phosphorus is a very harmful element in A709 grade 50 high strength steel steel. With the increase of phosphorus content, the strength, flexion ratio and hardness of A709 grade 50 high strength steel steel increased, but the plasticity and toughness decreased significantly. In particular, the lower the temperature, the greater the impact on plasticity and toughness, increase the cold brittleness of steel.
Both parties shall confirm the A709 grade 50 high strength steel material object and the quality of the products, confirm the reasons for the defects and the quality of the products, and sign the quality inspection agreement. Major quality objections shall be reported to relevant leaders in a timely manner, and shall be discussed and solved with the A709 grade 50 high strength steel steel plant.
