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Know More Of Classification Of Steel

Classification of steel

Classification of steel is steel carbon content of 0.04% -2.3% between the iron and 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 materials, the main methods are the following seven.

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%)

2. Classification by chemical composition

(1) (C ≤ 0.25%); c. High carbon steel (C ≤ 0.60%); b. Medium carbon steel (C ≤ 0.25 ~ 0.60%); c. High carbon steel (C ≤ 0.60%).

(2) alloy steel: a. Low alloy steel (total alloy element content ≤ 5%); b. Medium alloy steel (alloying element content> 5 ~ 10%);C. High alloy steel (total alloying content> 10%)

 

3, steel by forming method classification: (1) forged steel; (2) cast steel; (3) hot-rolled steel; (4) cold drawn steel.

(1) annealed state: a. Hypoeutectoid steel (ferrite + pearlite); b. Eutectoid steel (pearlite); c. Over a total steel steel (pearlite + Cementite); d. Listeria steel (pearlite + cementite).

(2) normalizing state: a. Pearlitic steel; b. Bainitic steel; c. Martensitic steel; d austenitic steel. (3) steel without phase change or part of the phase change.

(1) annealed state: a. Hypoeutectoid steel (ferrite + pearlite); b. Eutectoid steel (pearlite); c. Over a total steel steel (pearlite + Cementite); d. Listeria steel (pearlite + cementite).

(2) normalizing state: a. Pearlitic steel; b. Bainitic steel; c. Martensitic steel; d austenitic steel. (3) steel without phase change or part of the phase change

5, according to use classification

(1) Building and engineering steel: a. Ordinary carbon structural steel; b. Low alloy structural steel; c. Reinforced steel.

(B) surface hardening structural steel: including carburized steel, seepage steel, surface hardening steel; (c) easy to cut structural steel (2) steel structure steel a. Mechanical steel: (a) quenched and tempered structural steel; ; (D) cold-formed steel: including cold-rolled steel, cold forging 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, hot steel, valve steel; c. Electric alloy steel; d. Wear-resistant steel; ; F. Electrical steel.

(5) professional steel - such as bridge steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery and so on.

(A) Q195; (b) Q215 (A, B); (c) Q235 (A, B, C); (d) Q255 (A, B); (e) Q275. B. Low alloy structural steel c. Specific use of ordinary structural steel

(B) alloy structural steel; (c) spring steel; (d) easy to cut steel; (e) bearing (2) high quality steel (including high quality steel) a. Steel structural steel: (a) high quality carbon structural steel; Steel; (f) high quality structural steel for specific purposes. B. Tool steel: (a) carbon tool steel; (b) alloy tool steel; (c) high speed tool steel. (C) electrothermal alloy steel; (d) electrical steel; (e) high manganese wear-resistant steel; (b) heat-resistant steel;

7.According to smelting method classification

(1) according to the furnace a. Flat furnace steel: (a) acid flat furnace steel; (b) alkaline flat steel. B. Converter steel: (a) acid converter steel; (b) alkaline converter steel. Or (a) bottom-blown converter steel; (b) side-blown converter steel; (c) top-blown converter steel. (A) electric arc furnace steel; (b) electroslag furnace steel; (c) induction furnace steel; (d) vacuum consumable furnace steel; (e) electron beam furnace steel.

(2) steel by the degree of deoxidation and pouring system points a. Boiling steel; b. Semi-killed steel; c. Killed steel; d special cooling steel.


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