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Various classifications of stainless steel flat bar
Stainless steel flat bar is a kind of section steel. Stainless steel flat bar is generally divided into hot-rolled flat steel and cold-drawn flat steel. The general delivery state of hot-rolled 304 stainless steel flat steel surface is pickling, and the general delivery state of cold-drawn stainless steel flat bar is wire drawing and polishing.
There are many types of section steel, which is a solid long steel with a certain cross-sectional shape and size. According to the different cross-sectional shapes, it can be divided into simple and complex cross-sections. The former includes round steel, square steel, flat steel, hexagonal steel and angle steel; the latter includes rail, I-beam, channel steel, window frame steel and special-shaped steel.
Steel is an iron-carbon alloy with a carbon content of 0.04%-2.3%. In order to ensure its resistance and plasticity, the carbon content of stainless steel flat bar generally does not exceed 1.7%. In addition to iron and carbon, the primary elements of steel include silicon, manganese, sulfur, and phosphorus. There are many ways to classify steel, and the primary methods are as follows:
1. Classified by quality
(1) General steel (P≤0.045%, S≤0.050%)
(2) High-quality steel (both P and S ≤0.035%)
(3) High-grade high-quality steel (P≤0.035%, S≤0.030%)
2. Classified by chemical composition
(1) Carbon steel: low carbon steel (C≤0.25%); medium carbon steel (C≤0.25-0.60%); high carbon steel (C≥0.60%).
(2) Alloy steel: low alloy steel (total content of alloying elements≤5%); medium alloy steel (total content of alloying elements>5-10%); high-alloy steel (total content of alloying elements>10%).
3. Classified by forming method:
(1) Forged steel
(2) Cast steel
(3) Hot rolled steel
(4) Cold drawn steel.
4. Classified by metallographic organization
(1) Annealing conditions: hypoeutectoid steel (ferrite + pearlite); eutectoid steel (pearlite); hypereutectoid steel (pearlite + cementite); ledeburite steel (pearlite + cementite) Carbon body).
(2) Normalizing conditions: pearlite steel; bainitic steel; martensitic steel; austenitic steel.
(3) No phase change or partial phase change
5. Classification by use
(1) Steel for construction and engineering: general carbon structural steel; low-alloy structural steel; reinforced steel.
(2) Structural steel
a. Mechanical effect steel: quenched and tempered structural steel; surface hardened structural steel: including carburized steel, ammonia-infiltrated steel, surface quenching steel; free-cutting structural steel; steel for cold plastic forming: including cold stamping steel and cold heading Use steel.
b. Spring steel
c. Bearing steel
(3) East-west steel: carbon east-west steel; alloy east-west steel; high-speed east-west steel.
(4) Special-purpose steel: stainless acid-resistant steel; heat-resistant steel: including oxidation-resistant steel, heat-strength steel, valve steel; electric heating alloy steel; wear-resistant steel; low-temperature steel; electrical steel.
(5) Professional steel: such as steel for bridges, steel for ships, steel for boilers, steel for pressure vessels, steel for agricultural machinery, etc.
6. Inductive classification
(1) General steel
a. Carbon structural steel: Q195; Q215 (A, B); Q235 (A, B, C); Q255 (A, B); Q275.
b. Low alloy structural steel
c. General structural steel for specific uses
(2) High-quality steel (including high-grade high-quality steel)
a. Structural steel: high-quality carbon structural steel; alloy structural steel; spring steel; free-cutting steel; bearing steel; high-quality structural steel for specific purposes.
b. East-west steel: carbon East-West steel; alloy East-West steel; high-speed east-west steel.
c. Special functional steel: stainless acid-resistant steel; heat-resistant steel; electric heating alloy steel; electrical steel; high manganese wear-resistant steel.
7. Classified by exercise method
(1) According to furnace type
a. Open-hearth steel: acid open-hearth steel; basic open-hearth steel.
b. Converter steel: acid converter steel; alkaline converter steel. Or bottom-blown converter steel; side-blown converter steel; top-blown converter steel.
c. Electric furnace steel: electric arc furnace steel; electroslag furnace steel; induction furnace steel; vacuum consumable furnace steel; electron beam furnace steel.
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