(1) ordinary steel (P ≤ 0.045%, S ≤ 0.050%)
(2) Excellent steel material steel (P, S are ≤ 0.035%)
(3) senior quality steel (P ≤ 0.035%, S ≤ 0.030%)
(1) carbon steel: steel a. low carbon steel (C ≤ 0.25%); 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 (total alloy element content > 5 ~ 10%); c. high alloy steel (total alloy element content > 10%).
(1) forging steel;
(2) cast steel;
(3) hot-rolled steel;
(4) cold-drawn steel.
(1) annealed state: a. sub-eutectoid steel (ferrite + pearlite); b. Eutectoid steel (pearlite); c. over a total of steel precipitation (pearlite + carburite); d. Leithite steel (pearlite + carburite).
(2) Normalised steel: 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 the use of classification
(1) construction and engineering steel: a. ordinary carbon structural steel; b. low alloy structural steel; c. steel reinforcing steel.
(2) Steel structural steel
a. Machinery manufacturing steel: (a) quenched structural steel; (b) surface hardening structural steel: including carburized steel, carburized ammonia steel, surface quenching steel; (c) easy to cut structural steel; (d) cold plastic forming steel: including cold stamping steel, cold heading steel.
b. Spring steels
c. Bearing steels
(3) Tool steel: a. carbon tool steel; b. alloy tool steel; c. high-speed tool steel.
(4) Special performance steels: a. Stainless acid-resistant steels; b. Heat-resistant steels: including oxidation-resistant steels, heat-strengthening steels, gas-valve steels; c. Electro-thermal alloy steels; d. Wear-resistant steels; e. Steels for low temperature; f. Steels for electricians.
(5) Professional steel – such as bridge steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery steel, etc.
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(1) ordinary steel
a. Carbon structural steel: (a) Q195; (b) Q215 (A, B); (c) Q235 (A, B, C); (d) Q255 (A, B); (e) Q275.
b. Low alloy structural steel
c. General structural steel for specific purposes
(2) High quality steel (including high quality steel)
a. Steel structural steels: (a) high quality carbon structural steels; (b) alloy structural steels; (c) spring steels; (d) easy-cutting steels; (e) bearing steels; (f) specific-purpose high quality structural steels.
b. Tool steels: (a) carbon tool steels; (b) alloy tool steels; (c) high speed tool steels.
c. Special performance steel: (a) stainless acid-resistant steel; (b) heat-resistant steel; (c) electric alloy steel; (d) electrical steel; (e) high manganese wear-resistant steel.
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(1) according to furnace type
a. Blast furnace steel: (a) acid blast furnace steel; (b) alkaline blast furnace 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.
c. Electric furnace steel: (a) electric arc furnace steel; (b) electric slag furnace steel; (c) induction furnace steel; (d) vacuum self-consumption furnace steel; (e) electron beam furnace steel.
(2) Steel according to the degree of deoxidation and pouring system
a. boiling steel; b. semi-sedated steel; c. sedated steel; d. special sedated steel.
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Thick steel plates are by and large the same steel species as thin steel plates. In all aspects, in addition to the bridge steel plate, boiler steel plate, automobile manufacturing steel plate, pressure vessel steel plate and multi-layer high-pressure vessel steel plate and other varieties of purely thick plate, some varieties of steel plate such as automobile beam steel plate (2.5 ~ 10 mm thick), patterned steel plate (2.5 ~ 8 mm thick), stainless steel plate, heat-resistant steel plate and other varieties are crossed with the thin plate.
Another steel plate there is a material, not all steel plates are the same, the material is not the same, the steel plate used in different places, but also different. There are three types of steel plates: thick steel plates, thick steel plates, thick steel plates and thick steel plates.
There are three specifications, thick steel plates, thin steel plates and flat steel plates. The specifications are expressed in millimetres in line with “-” and width * thickness * length.
For example – 300*10*3000 means a steel plate with a width of 300mm, thickness of 10mm and length of 3000mm.
Thick steel plate: thickness greater than 4mm, width 600 to 3000mm, length 4 to 12m.
Thin steel plate: thickness less than 4mm, width 500~1500mm, length 0.5~4m.
Flat steel: thickness 4~60mm, width 12~200mm, length 3~9m.
