Different classifications of steel
Steel pipe classification, distinguish between steel pipe material
Steel is the carbon content of steel in the 0.04% -2.3% iron-carbon alloy. In order to ensure its toughness and plasticity, carbon content is generally not more than 1.7%. The main elements of steel in addition to iron, carbon, there are silicon, manganese, sulfur, phosphorus and so on. Classification of steel A variety of steel products.
The main methods are as follows:
1, steel by quality classification
(1) ordinary steel (P ≤ 0.045%, S ≤ 0.050%)
(2) excellent steel material steel (P, S are ≤ 0.035%)
(3) high quality steel (P ≤ 0.035%, S ≤ 0.030%)
Classified by chemical composition
Carbon steel (C≤0.25-0.60%); c. High carbon steel (C≤0.60%); b.
High-alloy steel (total alloying element content> 10%); (2) alloy steel: a. Low alloy steel (total alloying element content ≤ 5%); b alloy steel (total alloying elements> 5 ~ 10% %).
Steel by forming methods: (1) forging steel; (2) cast steel; (3) hot-rolled steel; (4) cold drawn steel.
(A) eutectoid steel (ferrite + pearlite); b. Eutectoid steel (pearlite); c. Had a total of steel analysis of steel (pearlite + infiltration) Carbon body); d. Lai-bainite steel (pearlite + cementite).
(2) normalized state: a. Pearlitic steel; b. Bainite steel; c. Martensitic steel; d. Austenitic steel.
(3) no phase transformation of steel or part of the phase transition
Classification by use 1) construction and engineering steel: a. Ordinary carbon structural steel; b. Low-alloy structural steel; c.
(B) surface hardened structural steel: including carburized steel, ammoniated steel, surface hardened steel; (c) free-cutting structural steel (a) structural steel; ; (D) cold plastic forming steel: including cold stamping steel, cold heading steel.
B. Spring steel
C. Bearing steel
(3) tool steel: a. Carbon tool steel; b. Alloy tool steel; c. High-speed tool steel.
(4) special performance steel: a. Stainless steel acid; b. Heat-resistant steel: including anti-oxidation steel, heat-resistant steel, valve steel; c. Electric alloy steel; d. Wear-resistant steel; e. ; F. Electrical steel.
(5) professional steel - such as bridge steel, ship steel, boiler steel, pressure vessel steel, steel and other agricultural machinery.
Comprehensive classification
(1) ordinary steel
A. Carbon structural steel: (a) Q195; (b) Q215 (A, B); (c) Q235 (A, B, C); (d) Q255 (A, B);
B. Low alloy structural steel
C. Ordinary structural steel for specific applications
(2) high-quality steel (including high-quality steel)
(B) alloy structural steels; (c) spring steels; (d) free-cutting steels; (e) bearing steels; and (f) high-quality structural steels for specific applications.
B. Tool steel: (a) carbon tool steel; (b) alloy tool steel; (c) high-speed tool steel.
C) special performance steels: (a) stainless acid-proof steel; (b) heat resistant steels; (c) electrothermal alloy steels; (d)
Classification by smelting method
(1) by the furnace points
(A) Flat hearth furnace steel; (b) Alkaline hearth furnace steel.
B. Converter steel: (a) acid converter steel; (b) alkaline converter steel. Or (a) bottom-blown converter steel; (b) side-blown converter steel; and (c) top-blown converter steel.
(C) induction furnace steel; (d) vacuum consumable furnace steel; and (e) electron beam furnace steel. (C) electric furnace steel: (a) electric arc furnace steel; (b) electroslag furnace steel;
(2) steel by deoxidation degree and pouring system points
B. Semi-killed steel; c. Killed steel; d. Special killed steel.
The above is the material of all the materials, the difference between the methods must be completed by the machine.