Product Name GradeB is a carbon steel. Yield strength 195MPA. Lower than Q235 strength. The price is cheaper. For construction, structure Q235D, motorcycle frame and so on. US ASTM grades are Gr.B (σs185). σs185 is the yield strength of 185MPa heat treatment and microstructure specifications: Heat treatment specifications: hot. Microstructure: ferrite and pearlite generally hot-rolled (including controlled rolling) state delivery. Product Name: Q235D carbon structural steel chemical composition Carbon C: 0.17 ~ 0.22% Si Si: ≤0.35% Mn Mn: 0.3 ~ 0.7% sulfur S: ≤0.045% P P: ≤0.045% chromium Cr: allow the residual content ≤0.030 % Ni: to allow the residual content ≤0.030% copper Cu: to allow the residual content of ≤0.030% quality carbon structural steel ① steel beginning of the two figures that the carbon content of steel, the average carbon content of the very few which Q235D specifications, for example, the average carbon content of 0.45% steel, steel number "45" Q235D use, which is not a sequence number Q235D characteristics, it can not be read as 45 steel. ② high manganese content in high-carbon steel, manganese should be marked, for example 50Mn. Q235D price | Suzhou, with (certified) | Q235D Suzhou, provided by the same metal material Limited. Suzhou, with Metal Materials Co. (www.szrtjs.com) is a professional engaged in "cold drawn bar, cold drawn hexagonal steel, cold-drawn flat steel, cold-drawn steel, seamless pipe," the company. Since its inception, we adhere to the "good faith, sound management" approach, the courage to participate in healthy competition in the market, so that the "Hangzhou Iron and Steel, Sha Steel, Baosteel" brand has a good reputation. We adhere to the "service first, customer first" principle, so Suzhou, won the trust of customers with all of the metal building, and establish a good corporate image. Special Note: This information is for reference only pictures and information, please contact us to obtain the most accurate information, thank you!