Ordinary steel P 0 045 , S 0 050 What does P and S stand for

The element content in steel, P is the phosphorus element, S is the sulfur element.

1. Classification by quality (1) Ordinary steel (P, S 2) High-quality steel (P, S are both 3) High-grade high-quality steel (P, S 2

1. According to the quality area.

BAI points: 1) Ordinary steel.

dup≤，s≤。

zhi (2) high quality.

DAO Steel: (p, s.

3) High-quality steel with high capacitance: (p,s.

2. Distinguish according to chemical composition

1) Mild steel (c.

2) Medium carbon steel (.

3) High-carbon steel (C.

The quality grade in the steel grade is from A to D, indicating the quality from low to high. The quality is mainly based on the impact toughness version.

Charpy V-notch test), the requirements for the cold bending test are also different.

For A-grade steel, impact toughness is not a requirement, and the cold bending test is only carried out when the demander has requirements.

The B, C and D levels require an AKV value of not less than 27J, but the test temperature of the three is different, B level requires an impact value at room temperature (25 5oC), and C and D levels require 0OC and 20OC impact values respectively. Grades B, C and D are also required to pass the cold bending test. In order to meet the above performance requirements, the chemical elements of different grades of Q235 steel are slightly different.

There are many types of steel, which can generally be divided into four categories: molds, plates, tubes and wires.

1. Section steel.

There are many varieties of section steel, which is a kind of solid long steel with a certain cross-sectional shape and size. According to the different cross-sectional shapes, it is divided into two types: simple and complex cross-sections. The former includes round bars, square bars, flat bars, hexagonal bars and angle bars; The latter includes rails, I-beams, channel steels, window frame steels and special-shaped steels.

The diameter of the small round steel is called the wire.

2. Steel plates.

It is a flat steel with a large width-to-thickness ratio and surface area. According to the different thicknesses, it is divided into three types: thin plate (thickness < 4 mn), medium plate (thickness 4-25 mn) and thick plate (thickness 25 mm). Steel strips are included within the steel plate category.

3. Steel pipes.

It is a long strip of steel with a hollow section. According to its different cross-sectional shapes, it can be divided into round pipes, square pipes, hexagonal pipes and various special-shaped cross-section steel pipes. According to different processing technology, it can be divided into two categories: seamless steel pipe and welded steel pipe.

4. Steel wires.

Steel wire is another cold-worked product of wire. According to different shapes, it is divided into round steel wire, flat steel wire and triangular steel wire. In addition to direct use, steel wire is also used in the production of wire ropes, steel grain lines and other products.

Further information: The molten steel produced in the furnace is cast into billets, and the ingots or billets are pressurized into steel (steel products).

Carbon structural steel is one of the carbon steels, such as: carbon tool steel, etc.!

The classification is different.

Steel is divided according to its chemical composition. There are two types of carbon steel and alloy steel.

According to the use, there are three types of steel: structural steel, tool steel, and special performance steel, among which structural steel includes carbon structural steel.

Hehe, got it?

This math.

The middle one is less than or equal to.

Ordinary steel (p, s high-quality steel (p, s (3) high-grade high-quality steel (p, s.

Steel: steel is widely used and varied, according to the different cross-sectional shapes, steel is generally divided into four categories: profiles, plates, pipes and metal products. Steel is a material of a certain shape, size, and properties that ingots, billets, or steel are made by pressure processing.

Most steel processing is carried out by pressure processing, which causes plastic deformation of the processed steel (billets, ingots, etc.). According to the different processing temperatures of steel, it can be divided into two types: cold working and hot working.

Steel is an iron-carbon alloy with a carbon content in between. In order to ensure its toughness and plasticity, the carbon content generally does not exceed. In addition to iron and carbon, the main elements of steel are silicon, manganese, sulfur, phosphorus, etc.

There are various classification methods for steel, and the main methods are as follows: 1. Classification by quality (1) Ordinary steel (P,S (2) High-quality steel (P, S (3) High-grade high-quality steel (P,S

1. Classification by quality.

1) Ordinary steel (p,s.)

2) High-quality steel (P, S average

3) High-grade high-quality steel (p,s.)