What steel mills are there in Tangshan?

There are: Tangshan Iron and Steel Group (with many enterprises), Guofeng, Yinfeng, Fufeng, Ruifeng, Yuefeng, Tianzhu, Semisteel, Guo Yi, Yi Rong, Beigang, Lu Gang, Jianlong, Songting, Donghai, Yangang, Delong Hyundai, Jinxi, Baotai, Qingquan, Chunxing, Rongxin, Zhengfeng and Chunxing.

Extended data:

Steel is the general name of iron-carbon alloy with carbon content of 0.02%-2. 1 1%. The chemical composition of steel varies greatly. Steel containing only carbon element is called carbon steel (carbon steel) or ordinary steel. In actual production, steel often contains different alloying elements, such as manganese, nickel and vanadium, according to different uses. The application and research of steel has a long history, but before the invention of bainite steelmaking in the19th century, the production of steel was a high-cost and inefficient work. Nowadays, steel has become one of the most used materials in the world because of its low price and reliable performance, and it is an indispensable part of architecture, manufacturing and people's daily life. It can be said that steel is the material basis of modern society.

Classification;

Classification by carbon content

Low carbon steel: the carbon content is generally lower than 0.25% (mass fraction);

Medium carbon steel: the carbon content is generally 0.25%~0.60% (mass fraction);

High carbon steel: the carbon content is generally higher than 0.60% (mass fraction).

Classification by quality

1. Ordinary steel (P≤0.045%, S≤0.050%)

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

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

According to the molding method of the present invention

1. Forged steel;

2. Cast steel;

3. Hot rolled steel;

4. Cold-drawn steel.

metallurgical structure

Annealing state:

A, hypoeutectoid steel;

B, eutectoid steel;

C, hypereutectoid steel (pearlite+cementite);

D ledeburite steel (pearlite+cementite).

Standardization:

A. pearlite steel;

B. bainite steel;

C. martensitic steel;

D. austenitic steel.

Classification by purpose

Alloy structural steel, steel bar.

Carburized steel, ammonia steel, surface hardened steel; Free-cutting structural steel; Steel for cold plastic forming: including steel for cold stamping and steel for cold heading.

Spring steel, bearing steel

Oxidation-resistant steel, heat-resistant steel, valve steel, electrothermal alloy steel, wear-resistant steel, low-temperature steel, electrical steel.

Steel for bridges, ships, boilers, pressure vessels, agricultural machinery, etc.

Comprehensive classification

Tool steel:

(a) carbon tool steel;

(b) alloy tool steel;

Special performance steel:

(a) Stainless steel and acid-resistant steel;

Heat-resistant steel;

Electrothermal alloy steel;

(d) electrical steel;

(e) High manganese wear-resistant steel;

(f) Special-purpose high-quality structural steel.