Discover the versatile 42CrMo, 35CrMo, Q195, Q235 Steel Round Bar and Mild Carbon Steel Billet, including 4140, S45c, S55c, S35c variants. Ideal for structural parts, molds, and shafts, these high-quality steel bars meet ASTM, AISI, JIS, and GB standards. Perfect for construction, automotive, and machinery applications.