What is the approximate price of Q345?
A: The market price in April 2026 was approximately 4200-4800 RMB/ton. Grade B is the cheapest, and Grade E is the most expensive.
27. What must the quality certificate include?
A: Furnace batch number, grade, specifications, applicable standards, chemical composition, mechanical properties, and flaw detection results.
28. What are the flaw detection standards for Q345?
A: Commonly used is UT (ultrasonic testing), GB/T 2970; 100% UT is required for pressure vessel steel plates.
29. What are the common applications?
A: Building steel structures, bridges, pressure vessels, cranes, construction machinery, vehicles, and pipelines.
30. Is Q345 allowed in steel structure design specifications?
A: GB 50017-2017 allows it; Grade B/C is preferred for main load-bearing components, and Grade D/E is used for low-temperature applications.