1. Classification of steel plates (including strip steel):
1. Classification by thickness: (1) Thin plate (2) Medium plate (3) Thick plate (4) Extra-thick plate
2. Classification by production method: (1) Hot rolled steel sheet (2) Cold rolled steel sheet
3. Classified by surface characteristics: (1) Galvanized sheet (hot-dip galvanized sheet, electro-galvanized sheet) (2) Tin-plated sheet (3) Composite steel sheet (4) Color
Coated steel plate
4. Classification by use: (1) Bridge steel plate (2) Boiler steel plate (3) Shipbuilding steel plate (4) Armor steel plate (5) Automobile steel plate (6)
Roofing steel plate (7) Structural steel plate (8) Electrical steel plate (silicon steel sheet) (9) Spring steel plate (10) Others
Second, common Japanese grades in steel plates for general 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, such as: S
(Steel) means steel, F (Ferrum) means iron; the second part means different shapes, types, and uses, such as P (Plate)
It means board, T (Tube) means tube, K (Kogu) means tool; the third part means characteristic number, generally the lowest tensile strength.
Such as: SS400——The first S means steel, the second S means “Structure”, and 400 is the lower limit of tensile strength
The strength is 400MPa, which as a whole refers to ordinary structural steel with a tensile strength of 400MPa.
2. SPHC—The first S is the abbreviation of Steel, P is the abbreviation of Plate, H is the abbreviation of Heat, and C is commercial
The abbreviation for Commercial, as a whole, means that hot-rolled steel plates and steel strips are generally used.
3. SPHD-stands for hot-rolled steel sheets and strips for stamping.
4. SPHE-stands for hot-rolled steel sheets and steel strips for deep drawing.
5. SPCC-means that cold-rolled carbon steel sheets and steel strips are generally used, which is equivalent to China’s Q195-215A grade. Where the third letter C is cold
Abbreviation for Cold. When it is necessary to ensure the tensile test, add T to the end of the grade as SPCCT.
6. SPCD-stands for cold-rolled carbon steel sheet and strip for stamping, which is equivalent to China 08AL (13237) high-quality carbon structural steel.
7. SPCE-stands for cold-rolled carbon steel sheet and strip for deep drawing, which is equivalent to China 08AL (5213) deep drawing steel. Need to guarantee non-time
For effectiveness, add N to the end of the brand name to indicate SPCEN. Cold-rolled carbon steel sheet and steel strip quenching and tempering code: 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, and hard is 1. Surface processing code: D for matt finish rolling and B for bright finish rolling.
For example, SPCC-SD means standard quenched and tempered, matt finish rolled cold-rolled carbon sheet. Another example is SPCCT-SB which means standard quenching and tempering, light
Bright processing requires cold-rolled carbon sheets with guaranteed mechanical properties.
8. The expression method of steel grade for JIS mechanical structure is as follows:
S + carbon content + letter code (C, CK), in which the carbon content is represented by the median value × 100, and the letter C: represents carbon K: represents carburizing
steel. For example, the carbon content of S20C is 0.18-0.23%.
3. Representation method of silicon steel sheet grades in my country and Japan
1. Representation of Chinese brands:
(1) Cold rolled non-oriented silicon steel strip (sheet)
Representation method: DW + iron loss value (at a frequency of 50HZ, the peak value of the magnetic induction with a sinusoidal waveform is the iron loss value per unit weight of 1.5T.)
100 times + 100 times the thickness value. For example, DW470-50 means cold-rolled non-oriented silicon steel with an iron loss value of 4.7w/kg and a thickness of 0.5mm.
The current new model is represented as 50W470.
(2) Cold rolled oriented silicon steel strip (sheet)
Representation method: DQ + iron loss value (at a frequency of 50HZ, the peak value of the magnetic induction with a sinusoidal waveform is the iron loss value per unit weight of 1.7T.)
100 times + 100 times the thickness value. Sometimes G is added after the iron loss value to indicate high magnetic inductance. For example, DQ133-30 indicates that the iron loss value is 1.33, and the thickness is
0.3mm cold-rolled oriented silicon steel strip (sheet), the new model is denoted as 30Q133.
(3) Hot rolled silicon steel sheet
Hot-rolled silicon steel sheets are represented by DR, which are divided into low silicon steel (silicon content ≤2.8%) and high silicon steel (silicon content>
2.8%). Representation method: DR + iron loss value (when the maximum value of magnetic flux density with 50HZ repeated magnetization and sinusoidal change is 1.5T
Iron loss per unit weight) 100 times + 100 times the thickness value. For example, DR510-50 means that the iron loss value is 5.1, and the thickness is 0.5mm.
Rolled silicon steel plate. The grades of hot-rolled silicon steel sheets for household appliances are expressed by JDR + iron loss value + thickness value, such as JDR540-50.
2. Representation method of Japanese brands:
(1) Cold-rolled non-oriented silicon steel strip is changed from the nominal thickness (value expanded by 100 times) + code A + iron loss guarantee value (the frequency is 50HZ, the maximum
The value of the iron loss when the magnetic flux density is 1.5T expanded by 100 times). For example, 50A470 means that the thickness is 0.5mm, and the guaranteed iron loss value is ≤
4.7 cold-rolled non-oriented silicon steel strip.
(2) Cold-rolled oriented silicon steel strip consists of nominal thickness (value expanded by 100 times) + code G: for ordinary materials, P: for high orientation
Material + iron loss guaranteed value (the value obtained by multiplying the iron loss value by 100 times when the frequency is 50HZ and the maximum magnetic flux density is 1.7T). Such as 30G130
Indicates a cold-rolled oriented silicon steel strip with a thickness of 0.3mm and a guaranteed iron loss value of ≤1.3.
Four. Tin plate and hot-dip galvanized plate:
1. Electroplating tin plate
Tin plate and steel strip, also called tinplate, the surface of this steel plate (strip) is plated with tin, which has good corrosion resistance and is non-toxic.
Used as packaging materials for cans, cable inner and outer sheaths, instrument telecommunication parts, flashlights and other small hardware
Link to this article：Introduction to basic common sense about sheet metal
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