... 3521-91, DIN 17223 1. Product Name: High carbon steel wires, spring steel wires, mattress spring ... wire, high carbon spring steel wires2. Material: Steel GradeGB ... Africa, Turkey, India, Bangladesh,5. Our other product: High carbon steel wires, medium carbon steel wires, low carbon ... 523-86808039Mob: +86-186 5117 4066Skyp: shelly_wire High Carbon Bed Spring Wires