Q: What is the typical chemical composition (%) of DC04?
A: C≤0.08, Mn≤0.4, P≤0.025, S≤0.025, Al≥0.015 (commonly ≥0.02), Si≤0.03.
Q: What is the yield strength range of DC04?
A: 130–210 MPa; the upper limit is +40 MPa for thickness ≤0.5 mm, and +20 MPa for 0.5–0.7 mm.
Q: What are the tensile strength and elongation after fracture of DC04?
A: Tensile strength ≥270 MPa, elongation after fracture ≥34%; elongation can be -4% for thickness ≤0.5 mm, and -2% for 0.5–0.7 mm.
Q: What are the requirements for the r-value (plastic strain ratio) and n-value (work hardening index) of DC04?
A: When the thickness is ≥0.5 mm, r90 ≥1.8, n90 ≥0.22; when the thickness is >2 mm, r90 can be reduced by 0.2.
Q: How does the chemical composition affect the deep drawing properties of DC04?
A: Low carbon and high aluminum reduce inclusions, refine grains, lower the yield strength ratio, and improve uniform elongation and r value, ensuring no cracking during deep drawing.