1018 American material, manganese higher than his, and domestic 16Mn or 15Mn, 20Mn similar chemical composition, and on the 20th Q235 carbon steel and almost, but he sent a lot of manganese content of .10 represents a carbon-manganese steel 18 representatives of the carbon content. 1018 high manganese carbon steel penetration steel, alloy steel is widely used in the piston, screws, shafts, machine tools, springs, manufacturing injection mold push plates, wedges, die sets, reset rod diameter than big putt, fixing plates and other structural core hardness: 50 hardness, no heat, ≤197HB, heat treatment specifications, normalizing, 910 ℃ 1018 Chemical Composition (%):. C: 0.17 ~ 0.24 Mn: 0.70 ~ 1.00 P: ≤0.035 S: ≤0.035 Si: 0.17 ~ 0.37 Cr: ≤0.25 Cu: ≤0.25 Ni: ≤0.25