Press Brake

For sheet metal bending, the press brake is a necessary machine. We have NC type and CNC type press brakes. At the same time, we can customize the punches and dies according to your practical use in sheet metal fabrication.

Shearing Machine

For the straight cutting of steel plate, hydraulic shearing machine is a good choice. It not only has high cutting efficiency, but also requires less investment. We have both swing beam shears and guillotine shears for your selection.

Laser Cutting Machine

In the current metal plate and pipe cutting, laser cutting machine is undoubtedly the best choice. It can not only cut various shapes, but also has small cutting gap, high precision and high cutting efficiency. Today, it is very cost-effective.

Types Of Steel Plate: Classified By Different Standard

Types Of Steel Plate

1. Classification of steel plate (including strip steel)

1. Classification by thickness:

Thin plate, medium plate, thick plate and extra thick plate.

2. Classification by production method:

Hot rolled steel plate, cold-rolled steel plate.

3. Classification by surface features:

Galvanized sheet (hot-dip galvanized sheet, electro-galvanized sheet), tinplate, composite steel plate, color coated steel plate.

4. Classification by purpose:

Bridge steel plate, boiler steel plate, shipbuilding steel plate, armored steel plate, automobile steel plate, roof steel plate, structural steel plate, electrical steel plate (silicon steel sheet), spring steel plate and others.

2. Common Japanese brands of steel plates for ordinary and mechanical structures

  1. In the grades of Japanese steel (JIS Series), ordinary structural steel is mainly composed of three parts.

The first part represents the material. For example, S (steel) represents steel and f (ferrum) represents iron;

The second part represents different shapes, types and uses, such as P (plate) represents plate, T (tube) represents tube, and K (kogu) represents tool;

The third part represents the characteristic number, which is generally the minimum tensile strength. For example, SS400 — the first S represents steel, the second S represents “structure”, 400 represents the lower limit tensile strength of 400MPa, and the whole represents ordinary structural steel with tensile strength of 400MPa.

  1. SPHC — in the first place, s is the abbreviation of steel, P is the abbreviation of plate, His the abbreviation of hot heat, and C is the abbreviation of commercial.

It generally represents hot-rolled steel plate and strip.

  1. SPHD — hot rolled steel plate and strip for stamping.
  2. SPHE — hot rolled steel plate and strip for deep drawing.
  3. SPCC — cold rolled carbon steel sheet and strip, equivalent to Chinese q195-215a brand.

The third letter C is the abbreviation of cold.

When it is necessary to ensure the tensile test, add t at the end of the brand as spcct.

  1. SPCD — cold rolled carbon steel sheet and strip for stamping, equivalent to China 08Al (13237) high quality carbon structural steel.
  2. SPCE — cold rolled carbon steel sheet and strip for deep drawing, equivalent to 08Al (5213) deep drawing steel in China.

When non timeliness is required, add n at the end of the brand as spcen.

Quenching and tempering code of cold rolled carbon steel sheet and strip: annealing state is A, standard quenching and tempering is S, 1 / 8 hard is 8, 1 / 4 hard is 4, 1 / 2 hard is 2, hard is 1.

Surface processing code: D for matte finish rolling and B for bright finish rolling.

For example, spcc-sd represents cold rolled carbon sheet for standard quenching and tempering and matte finish rolling.

For another example, spcct-sb represents cold-rolled carbon sheet with standard quenching and tempering and bright processing and required to ensure mechanical properties.

  1. The steel grade for JIS mechanical structure is expressed as: S + carbon content + letter code (C, CK), in which the carbon content is the intermediate value × 100 means, the letter C means carbon, and K means steel for carburizing.

For example, the carbon content of carbon coil s20c is 0.18% ~ 0.23%.

3. Designation of silicon steel sheet in China and Japan

1. Chinese brand representation:

(1) Cold rolled non-oriented silicon steel strip (sheet)

Expression method: DW + 100 times of iron loss value (at the frequency of 50HZ, the magnetic induction peak with sinusoidal waveform is the unit weight iron loss value of 1.5T) + 100 times of thickness value.

For example, DW470-50 represents cold-rolled non oriented silicon steel with iron loss value of 4.7w/kg and thickness of 0.5mm.

Now the new model is 50W470.

(2) Cold rolled oriented silicon steel strip (sheet)

Expression method: 100 times of DQ + iron loss value (at the frequency of 50HZ, the magnetic induction peak with sinusoidal waveform is the unit weight iron loss value of 1.7t) + 100 times of thickness value.

Sometimes G is added after the iron loss value to indicate high magnetic induction.

For example, DQ133-30 represents cold rolled oriented silicon steel strip (sheet) with iron loss value of 1.33 and thickness of 0.3mm. Now the new model is 30Q133.

(3) Hot rolled silicon steel plate

Hot rolled silicon steel plate is represented by DR, which is divided into low silicon steel (silicon content ≤ 2.8%) and high silicon steel (silicon content > 2.8%).

Expression method: DR + 100 times of iron loss value (iron loss value per unit weight when the maximum magnetic induction intensity with 50HZ repeated magnetization and sinusoidal variation is 1.5T) + 100 times of thickness value.

For example, DR510-50 represents hot-rolled silicon steel plate with iron loss value of 5.1 and thickness of 0.5mm.

The grade of hot rolled silicon steel sheet for household appliances is expressed by JDR + iron loss value + thickness value, such as JDR540-50.

2. Japanese grade representation:

(1) Cold rolled non oriented silicon steel strip

From the nominal thickness (expanded by 100 times) + code a + iron loss guarantee value (the value after expanding the iron loss value when the frequency is 50HZ and the maximum magnetic flux density is 1.5T by 100 times).

For example, 50A470 represents cold-rolled non oriented silicon steel strip with thickness of 0.5mm and iron loss guarantee value ≤ 4.7.

(2) Cold rolled oriented silicon steel strip

Nominal thickness (expanded by 100 times) + code G: ordinary material, P: high orientation material + iron loss guarantee value (the value after expanding the iron loss value when the frequency is 50HZ and the maximum magnetic flux density is 1.7T by 100 times).

For example, 30G130 represents cold-rolled oriented silicon steel strip with thickness of 0.3mm and iron loss guarantee value ≤ 1.3.

4. Electroplated tin plate and hot-dip galvanized plate

1. Electroplated tin plate

Electroplated tin sheet and steel strip, also known as tinplate, the surface of this steel plate (strip) is plated with tin, which has good corrosion resistance and is non-toxic.

It can be used as packaging material for cans, inner and outer sheath of cables, instrument and telecommunication parts, flashlight and other hardware.

2. Hot dip galvanized sheet

Zinc plating on the surface of steel sheet and steel strip by continuous hot plating can prevent corrosion and rust on the surface of steel sheet and steel strip.

Galvanized steel sheet and strip are widely used in machinery, light industry, construction, transportation, chemical industry, post and telecommunications and other industries.

5. Boiling steel plate and killed steel plate

1. Rimmed steel plate is a hot rolled steel plate made of ordinary carbon structural steel rimmed steel

Boiling steel is a kind of steel with incomplete deoxidation.

Only a certain amount of weak deoxidizer is used to deoxidize the liquid steel, and the oxygen content of the liquid steel is high.

When the liquid steel is injected into the ingot mold, the carbon oxygen reaction produces a large amount of gas, resulting in the boiling of the liquid steel. Therefore, boiling steel is named.

The carbon content of rimmed steel is low, and the silicon content in steel is also low (Si < 0.07%) because ferrosilicon deoxidation is not used.

The outer layer of boiling steel is crystallized under the condition of violent stirring of liquid steel caused by boiling, so the surface layer is pure and dense, the surface quality is good, has good plasticity and stamping performance, no large centralized shrinkage cavity, less head cutting, high yield, simple production process of boiling steel, less ferroalloy consumption and low steel cost.

Boiling steel plate is widely used to manufacture all kinds of stamping parts, architectural and engineering structures and some less important machine structure parts.

However, there are many impurities in the core of boiling steel, serious segregation, non compact microstructure and uneven mechanical properties.

At the same time, due to the high gas content in the steel, it has low toughness, high cold brittleness and aging sensitivity, and poor welding performance.

Therefore, boiling steel plate is not suitable for manufacturing welded structures and other important structures that bear impact load and work at low temperature.

2. Killed steel plate is a hot rolled steel plate made of ordinary carbon structural steel killed steel

Killed steel is a steel with complete deoxidation.

The molten steel is fully deoxidized with ferromanganese, ferrosilicon and aluminum before pouring.

The oxygen content of the molten steel is low (generally 0.002% ~ 0.003%), and the molten steel is relatively calm in the ingot mold without boiling. Therefore, killed steel is named.

Under normal operating conditions, there are no bubbles in the killed steel, and the microstructure is uniform and dense;

Due to the low oxygen content, there are less oxide inclusions in the steel, the purity is high, and the tendency of cold embrittlement and aging is small;

At the same time, the killed steel has small segregation, uniform properties and high quality.

The disadvantages of killed steel are concentrated shrinkage, low yield and high price.

Therefore, killed steel is mainly used for components bearing impact at low temperature, welded structures and other components requiring high strength.

Low alloy steel plates are both killed and semi killed steel plates.

Because of its high strength and superior performance, it can save a lot of steel and reduce the weight of the structure.

Its application has been more and more widely.

6. High quality carbon structural steel plate

High quality carbon structural steel is a carbon steel with carbon content less than 0.8%.

This steel contains less sulfur, phosphorus and non-metallic inclusions than carbon structural steel, and has excellent mechanical properties.

According to different carbon content, it can be divided into three categories: low carbon steel (C ≤ 0.25%), medium carbon steel (C = 0.25% ~ 0.6%) and high carbon steel (c > 0.6%);

According to different manganese content, high-quality carbon structural steel is divided into two groups: normal manganese content (manganese content 0.25% – 0.8%) and high manganese content (manganese content 0.70% – 1.20%).

The latter has better mechanical and processing properties.

1. Hot rolled high quality carbon structural steel sheets and strips

High quality carbon structural steel hot rolled sheet and strip are used in automobile, aviation industry and other departments.

Its steel grades are boiling steel: 08F, 10F, 15F;

Killed steel: 08, 08Al, 10, 15, 20, 25, 30, 35, 40, 45, 50.

25 and below are low carbon steel plates, and 30 and above are medium carbon steel plates.

2. High-quality carbon structural steel hot rolled thick steel plate and wide steel strip

High quality carbon structural steel hot rolled thick steel plate and wide steel strip are used for various mechanical structural parts.

The grade of steel is low carbon steel, including 05f, 08F, 08, 10F, 10, 15F, 15, 20f, 20, 25, 20Mn, 25MN, etc;

Medium carbon steel includes: 30, 35, 40, 45, 50, 55, 60, 30mn, 40Mn, 50Mn, 60Mn, etc;

High carbon steel includes: 65, 70, 65Mn, etc.

7. Special structural steel plate

1. Steel plates for pressure vessels

Use capital r at the end of the brand, and its brand can be expressed by yield point or carbon content or alloy element.

For example, Q345R and Q345 are yield points.

For another example, 20R, 16MnR, 15MnVR, 15MnVNR, 8MnMoNbR, MnNiMoNbR, 15CrMoR, etc. are expressed by carbon content or alloy elements.

2. Steel plates for welded gas cylinders

Use capital HP at the end of the brand, and its brand can be expressed by yield point, such as Q295HP and Q345HP;

It can also be expressed by alloying elements, such as 16mnrehp.

3. Boiler steel plate

Use lowercase g at the end of the brand.

Its brand can be expressed by yield point, such as Q390G;

It can also be expressed by carbon content or alloy elements, such as 20g, 22Mng, 15CrMoG, 16Mng, 19Mng, 13MnNiCrMoNbg, 12Cr1MoVG, etc.

4. Steel plate for bridge

Use lowercase Q at the end of the brand, such as q420q, 16Mnq, 14MnNbq, etc.

5. Steel plate for automobile girder

Use capital l at the end of the brand, such as 09mnrel, 06til, 08til, 10til, 09sivl, 16MnL, 16MnREL, etc.

8. Color coated steel plate

Color coated steel plate and strip are products based on metal strip and coated with various organic coatings on its surface.

They are used in the fields of construction, household appliances, steel furniture, transportation and so on.

9. Structural steel for hull

Shipbuilding steel generally refers to the steel used for hull structure.

It refers to the steel used for manufacturing hull structure produced according to the construction specifications of the classification society.

It is often used for ordering, production scheduling and sales of special steel.

A ship includes ship plate, section steel, etc.

(1) Variety specification

Structural steel for hull is divided into general strength structural steel and high strength structural steel according to its minimum yield point.

The general strength structural steel according to CCS standards is divided into four quality grades: A, B, D and E;

The high-strength structural steel specified in the rules and standards of China Classification Society has three strength grades and four quality grades.

(2) Precautions for delivery and acceptance of marine steel

  1. Review of quality certificate:

The steel factory must deliver the goods according to the specifications agreed in the contract according to the user’s requirements, and provide the original quality certificate.

The certificate must contain the following contents:

(1) Specification requirements;

(2) Quality record number and certificate number;

(3) Furnace batch number and technical grade;

(4) Chemical composition and mechanical properties;

(5) Certificate of approval of classification society and signature of surveyor.

  1. Physical Review:

For the delivery of marine steel, the physical object shall have the manufacturer’s mark, etc. Specifically:

(1) Classification society approval mark;

(2) Frame or paste marks with paint, including technical parameters, such as furnace batch number, specification and standard grade, length and width, etc;

(3) The appearance is smooth and smooth without defects.

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