What is 20MnB5 carbon equivalent steel chrome

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Cold rolled coil products 20MnB5 carbon equivalent steel have accurate size and uniform thickness, and the thickness difference of coil is generally less than 0.01-0.03mm or less, which can fully meet the requirements of high precision tolerance. The surface quality of cold rolled products 20MnB5 carbon equivalent steel is superior, and there are no defects such as pockmarks, pressing iron oxide scale and so on, which often appear in hot rolled coils. According to the requirements of users, coils 20MnB5 carbon equivalent steel with different surface roughness can be produced (glossy surface or matte surface, etc.).

Q690E high strength steel chemical composition: C: 0.08-0.15, Si: 0.17-0.37, Mn: 0.40-0.70, S: ≤0.035, P: ≤0.035, Cr: 0.30～0.60, Cu: ≤0.030, Ni: ≤0.030, V: 0.15-0.30, Mo: 0.25-0.35
Q690E mechanical properties:
Tensile strength σb (MPa): ≥440
Yield strength σs (MPa): ≥225
Elongation δ5 (%): ≥22
Reduction of area ψ (%): ≥50
Impact energy Akv (J): ≥78

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