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天津市北辰区中关村可信产业园B9-1 Address: B9-1, Trustworthy Industrial Park, Zhongguancun, Beichen District, Tianjin

15522233345 Mobile: 15522233345

许宗涛 Contact: Xu Zongtao

High pressure pipe 1




There are many ways to classify steel. There are eight main methods:

1. Classified by quality

(1) ordinary steel (phosphorus P≤0.045%, sulfur S≤0.050%)

(2) High-quality steel (both P and S ≤ 0.035%)

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

2. Classified by chemical composition

(1) Carbon steel: a. Low carbon steel (carbon C≤0.25%); b. Medium carbon steel (carbon C≤0.25 ~ 0.60%); c. High carbon steel (carbon C≤0.60%).

(2) Alloy steel: a. Low-alloy steel (total content of alloy elements ≤5%); b. Medium-alloy steel (total content of alloy elements> 5-10%); c. High-alloy steel (total content of alloy elements> 10) %).

3. Classification by forming method

(1) Forged steel;

(2) cast steel;

(3) Hot rolled steel;

(4) Cold drawn steel.

4. Classification by metallographic organization

(1) In the annealed state: a. Hypoeutectoid steel (ferrite + pearlite); b. Eutectoid steel (pearlite); c. Hypereutectoid steel (pearlite + cementite); d. Lai Austenitic steel (pearlite + cementite).

(2) Normalized: a. Pearlitic steel; b. Bainite steel; c. Martensitic steel; d. Austenitic steel.

(3) No phase change or partial phase change.

5. Classification by use

(1) Steel for construction and engineering: a. Ordinary carbon structural steel; b. Low alloy structural steel; c. Reinforced steel.

(2) Structural steel

a. Steel for machine manufacturing: (a) quenched and tempered structural steel; (b) case hardened structural steel: including carburized steel, ammoniated steel, and surface hardened steel; (c) free-cut structural steel; (d) cold plastic Forming steel: 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 oxidation-resistant steel, heat-strength steel, and valve steel; c. Electric 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, and agricultural machinery steel.

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. Structural steel: (a) high-quality carbon structural steel; (b) alloy structural steel; (c) spring steel; (d) free-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-resistant steel; (b) heat-resistant steel; (c) electric heating alloy steel; (d) electrical steel; (e) high-manganese wear-resistant steel.

7. Classification by smelting method

(1) by furnace type

a. Open hearth steel: (a) acid hearth steel; (b) alkaline hearth 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) electroslag furnace steel; (c) induction furnace steel; (d) vacuum consumable furnace steel; (e) electron beam furnace steel.

(2) According to the degree of deoxidation and pouring system:

a. Boiling steel; b. Semi-killed steel; killed steel; d. special killed steel.

8. Classified by shape

(1) Profile

(2) Plate

(3) Pipe

(4) Four categories of metal products.




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