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What Is The Classification Of Steel?
Jun 01, 2018

There are various methods for classifying steel. There are seven main classifications.

1. Classification by quality

(1) ordinary steel (P < 0.045%, S < 0.050%)

(2) high quality steel (P and S are less than or equal to 0.035%)

(3) high quality steel (P < 0.035%, S < 0.030%)

2. Classification by chemical composition

(1) carbon steel: a. low carbon steel (C = less than 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 (the total content of alloy elements is less than 5%); B. Medium alloy steel (the total content of alloy elements > 5~10%); C. High alloy steel (> 10% of total alloy element content).

3. Classification by forming method:

(1) forging steel; (2) cast steel; (3) hot-rolled steel; (4) cold drawing steel.

4. Classification by metallographic organization

(1) annealed: a. hypoeutectic steel (ferrite + pearlite); B. Eutectic steel (pearlite); C. Hypereutectic steel (pearlite + cementite); D. leibnitic steel (pearlite + cementite).

(2) normalizing: a. pearlitic steel; B. Bainite steel; C. martensite steel; D. Austenitic steel. (3) there is no phase change or partial phase change

5. Classification by use

(1) construction and engineering steel: a. plain carbon structural steel; B. Low alloy structural steel; C. reinforced steel.

(2) structural steel

A. Steel for mechanical manufacturing :(a) tempered structural steel; (b) surface hardening structural steel: including carburized steel, ammonia carburized steel, surface hardening steel; (c) easy-to-cut structural steel; (d) cold plastic forming steel: including steel for cold stamping and steel for cold upsetting. B. spring steel c. bearing steel

(3) tool steel: a. carbon tool steel; B. Alloy tool steel; C. high-speed tool steel. (4) special properties steel: a. stainless acid-proof steel; B. Heat resistant steel: including oxidation resistant steel, hot strength steel and air valve steel; C. electrothermal alloy steel; D. wear resistant steel; E. low temperature steel; F. Steel for electrical purposes. (5) professional steel -- such as bridge steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery steel, etc.

6. Comprehensive classification

(1) ordinary steel

Carbon structural steel :(a) Q195; (b) Q215(A, b); (c) Q235(A, B, c); (d) Q255(A, B); Q275 (e). B. Low alloy structural steel c. General structural steel for specific purposes

(2) high quality steel (including high quality steel)

A. Structural steel :(a) high quality carbon structural steel; (b) alloy structural steel; (c) spring steel; (d) easy-to-cut steel; (e) bearing 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. Special performance steel :(a) stainless acid-proof 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) by type

A. Open hearth steel :(a) acid open hearth steel; (b) basic open hearth steel. B. Converter steel :(a) acid converter steel; (b) basic converter steel. Or (a) bottom blown converter steel; (b) side blown converter steel; (c) top blown converter steel. (a) arc furnace steel; (b) slag furnace steel; (c) induction furnace steel; (d) vacuum consumable furnace steel; (e) electron beam furnace steel.

(2) according to the deoxygenation degree and casting system

A. Effervescent steel; B. Semi-killed steel; C. sedation steel; D. special calm steel.