Jul 27, 2023
7 types of construction steel
Construction steel can usually be divided into steel for steel structure and steel for reinforced concrete structure.
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Jul 27, 2023
Construction steel can usually be divided into steel for steel structure and steel for reinforced concrete structure.
1. Steel is classified according to quality
(1) Ordinary steel (P≤0.045%, S≤0.050%)
(2) Excellent steel quality steel (P, S ≤0.035%)
(3) High quality steel (P≤0.035%, S≤0.030%)
2. Classification by chemical composition
(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 alloying element content ≤5%); b. Medium alloy steel (total alloying element content > 5~10%); c. High alloy steel (total alloying element content > 10%).
3. steel according to the forming method classification: (1) forged steel; (2) Cast steel; (3) Hot rolled steel; (4) Cold drawn steel.
Metallographic organization
4. Steel is classified according to metallographic organization
(1) Annealed state: a. hypoeutectoid steel (ferrite + pearlite); b. Eutectoid steel (pearlite); c. Steel evolution of hypercosteel (pearlite + cementite); d. Letenite steel (pearlite + cementite).
(2) Normalizing state: a. pearlite steel; b. Bainitic steel; c. Martensitic steel; d. austenitic steel.
(3) Steel without phase change or partial phase change 5, classified by use
(1) Construction and engineering steel: a. ordinary carbon structural steel; b. Low alloy structural steel; c. Steel reinforcement.
(2) Steel structural steel
a. Steel for mechanical manufacturing: (a) tempered structural steel; (b) surface hardened structural steel: including carburized steel, ammoniated steel, surface hardened steel; (c) easy cutting structural steel; (d) Steel for cold plastic forming: including cold stamping steel and 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 acid-resistant steel; b. Heat-resistant steel: including anti-oxidation steel, heat-strong steel, valve steel; c. Electrothermal alloy steel; d. Wear-resistant steel; e. Low temperature steel; f. Electrical steel.
(5) Professional steel - such as bridge steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery steel, etc.
6. Comprehensive classification
(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. Ordinary structural steel for specific purposes
(2) High quality steel (including high quality steel)
A. Steel structural steel: (a) high-quality carbon structural steel; (b) alloy structural steel; (c) Spring steel; (d) Easy cutting steel; (e) Bearing steel; (f) Quality structural steel for specific purposes.
b. Tool steel: (a) carbon tool steel; (b) Alloy tool steel; (c) high-speed tool steel.
c. Special performance steel: (a) stainless acid-resistant steel; (b) Heat-resistant steel; (c) electrothermal alloy steel; (d) Steel for electrical purposes; (e) High manganese wear-resistant steel.
7. Classification by smelting method
(1) According to furnace type
A. Open-hearth steel: (a) acid open-hearth steel; (b) basic open-hearth steel.
b. Converter steel: (a) acid converter steel; (b) Basic Bessemer steel. Or (a) bottom blown Bessemer steel; (b) side-blown Bessemer steel; (c) Top blown converter steel.
c. Electric furnace steel: (a) electric furnace steel; (b) electroslag furnace steel; (c) induction furnace steel; (d) vacuum consumable furnace steel; (e) electron beam furnace steel.
(2) Steel is divided according to the degree of deoxidation and pouring system
a. boiling steel; b. Semi-killed steel; c. Killed steel; d. Special killing steel.