Why does the carbon content of steel increase and the mechanical properties change?
3, according to the forming method classification: (1) forging steel; (2) cast steel; (3) hot rolled steel; (4) cold drawn steel4., according to chemical classification(1): A. carbon steel low carbon steel (C = 0.25%); B. (C = 0.25~0.60%) in carbon steel high carbon steel; C. (C = 0.60%).(2): A. alloy steel, low alloy steel (alloy element content is less than or equal to 5%) B. alloy (5~10% alloy element content, high alloy steel (C.) alloy element content > 10%).5. Classification according to metallographic structure(1) annealed state of A. eutectoid steel (ferrite + Zhu Guangti), B. eutectoid steel (Zhu Guangti), C. eutectoid steel (Zhu Guangti + cementite), D., bainitic steel (Zhu Guangti + seepage body)(2) normalizing condition: A. pearlitic steel; B. bainitic steel; C. martensitic steel; D. austenitic steel(3) no phase change or partial phase change occurs6, according to smelting method classification(1) according to the kind of furnaceA.: open hearth steel (a) acid open hearth steel; (b) basic open hearth steel.B. converter steel: (a) the Bessemer steel; (b) basic Bessemer steel. Or (a) bottom blown converter steel; (b) (c) side blown converter steel; BOF steel.C. electric furnace steel: electric arc furnace (a) steel; steel electroslag furnace (b); (c) induction furnace steel; (d) vacuum consumable steel; (E) electron beam furnace.(2) according to the degree of deoxidization and pouring systemA. boiling steel; B. semi killed steel; C. killed steel; D. special killed steel
Steel is an alloy of iron and carbon in 0.04%-2.3% between carbon content. In order to ensure its toughness and plasticity, the main elements in addition to iron, carbon and carbon content is generally not more than 1.7%. steel, and silicon, manganese, sulfur and phosphorus. Classification method of steel variety, there are seven kinds of main methods:1, according to quality classification(1) ordinary steel (P = 0.045%, S = 0.050%)(2) high quality steel (P, S = 0.035%)(3) high quality steel (P = 0.035%, S = 0.030%)2. Classification by purpose(1) building and engineering steel: A. ordinary carbon structural steel; B. low-alloy structural steel; C. reinforced steel(2) structural steelSteel manufacturing machinery: A. (a) quenched and tempered steel; surface hardening (b) steel structure: including carburizing steel, surface hardened steel, with infiltration of ammonia (c) free cutting steel; steel structure; (d) cold forming steel: steel, cold stamping.B. spring steelC. bearing steel(3) tool steel: A. carbon tool steel; B. alloy tool steel; C. high speed tool steel(4) special performance steel: A. stainless acid resistant steel, B. heat-resistant steel, including oxidation resistant steel, hot strong steel, air valve steel, C. electric heating alloy steel, D. wear-resistant steel, e. low temperature steel, F. electrical steel(5) professional steel - such as bridge steel, shipbuilding steel, boiler steel, steel for pressure vessel, steel for agricultural machinery, etc.
