Building materials - Steel

Steel: is the ingot, billet or steel through the pressure processing to make the required various shapes, sizes and properties of the material.

Steel is an essential material for national construction and the realization of the four modernizations, and its wide application and variety, according to the different section shapes, steel is generally divided into four categories: profiles, plates, pipes and metal products, and is also divided into heavy rail, light rail, large steel, medium steel, small steel, steel cold-formed steel. High-quality steel, wire, medium thickness steel plate, thin steel plate, electrical silicon steel sheet, strip steel, seamless steel pipe steel, welded steel pipe, metal products and other varieties.

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One. Finished materials

Building materials - rebar, wire, disc screw, round steel

Pipe - seamless pipe, welded pipe

Plate - cold, hot rolled plate/coil, medium and thick plate, color coated plate (galvanized plate, color coated plate, tinplate, aluminum plated zinc plate), silicon steel, strip steel

Profile - Angle slot, H shaped steel, square steel, flat steel, ball flat steel

Two. Special steel

Including structural steel, tool steel, die steel, spring steel, bearing steel, cold heading steel, hard wire

Steel is an iron-carbon alloy with a carbon content between 0.0218% and 2.11%. In order to ensure its toughness and plasticity, the carbon content is generally not more than 1.7%. The main elements of steel in addition to iron, carbon, silicon, manganese, sulfur, phosphorus and so on.

1. Classification by quality

Ordinary steel: (P≤0.045%, S≤0.050%)

High quality steel: (P, S≤0.035%)

High quality steel: (P≤0.035%, S≤0.030%)

2. Classification by chemical composition

Carbon steel:

(1) Low carbon steel (C≤0.25%)

(2) Medium carbon steel (0.25≤C≤0.60%)

(3) High carbon steel (C≥0.60%)

(5) Low alloy steel (total alloying element content < 5%);

(6) medium alloy steel (5%≤ total alloying element content ≤10%);

(7) High alloy steel (total alloying element content > 10%).

3. according to the forming method classification:

(1) Forged steel;

(2) Cast steel;

(3) Hot rolled steel;

(4) Cold drawn steel.

4. Classification by metallographic organization

Annealed:

(1) hypoeutectoid steel (ferrite + pearlite)

(2) eutectoid steel (pearlite)

(3) hypereutectoid steel (pearlite + cementite)

(4) Letenite steel (pearlite + cementite)

Normalizing:

(1) pearlite steel

(2) bainitic steel

(3) martensitic steel

(4) Austenitic steel

5. Classification by use

Engineering steel:

(1) Ordinary carbon structural steel

(2) Low alloy structural steel

(3) Steel reinforcement

Carburizing steel:

(1) nitriding steel

(2) Steel for surface hardening

(3) Easy to cut structural steel

(4) Steel for cold plastic forming: including cold stamping steel and cold heading steel

Carbon tool steel:

(1) Alloy tool steel

(2) high-speed tool steel

Special performance steel:

(1) stainless acid-resistant steel

(2) Heat-resistant steel: including anti-oxidation steel, heat-strong steel, valve steel

(3) Electric heating alloy steel

(4) wear-resistant steel

(5) Low temperature steel

(6) Electrical steel

6. Comprehensive classification

Structural steel:

(1) high-quality carbon structural steel

(2) Alloy structural steel

(3) Spring steel

(4) Easy to cut steel

(5) Bearing steel

(6) high-quality structural steel for specific purposes

Tool steel:

(1) Carbon tool steel

(2) Alloy tool steel

(3) high-speed tool steel

Special performance steel:

(1) stainless acid-resistant steel

(2) Heat-resistant steel

(3) Electric heating alloy steel

(4) Electrical steel

(5) High manganese wear-resistant steel

7. Classification by smelting method

Electric furnace steel:

(1) Electric arc furnace steel;

(2) electroslag furnace steel;

(3) induction furnace steel;

(4) vacuum consumable furnace steel;

(5) electron beam furnace steel.