What are the common stamping steel plates?
The commonly used stamping steel plates materials are: various steel plates, stainless steel plates, aluminum plates, copper plates and other non-metallic plates.
Classification of steel plate (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 plate (2) cold rolled steel plate
- 3. According to the surface characteristics, the following categories are as follows: (1) galvanized plate (hot dip galvanized plate, electro galvanized plate) (2) tinplate (3) composite steel plate (4) color coated steel plate
- 4. Classification by purpose: (1) bridge steel plate (2) boiler plate (3) shipbuilding steel plate (4) armor plate (5) automobile steel plate (6) roof plate (7) structural steel plate (8) electrical steel plate (silicon steel sheet) (9) spring plate (10) other
Generally speaking, the stamping steel plate refers to thin steel plate (strip); while the so-called thin steel plate refers to the steel plate with plate thickness less than 4mm, which is divided into hot-rolled plate and cold-rolled plate.
Hot rolling is to use slab (mainly continuous casting slab) as raw material, after heating, the strip is made by roughing mill and finishing mill. The hot strip from the last finishing mill is cooled to the set temperature by laminar flow, and then rolled into strip coil by coiler. According to the different needs of users, the cooled steel strip coil is processed by different finishing lines (leveling, straightening, cross cutting or longitudinal cutting, inspection, weighing, packaging and marking, etc.) to become steel plate, flat coil and slitting steel strip products. In short, a billet after heating (that is, the red hot steel in the TV) after several passes of rolling, and then trimming, correction into steel plate, this is called hot rolling.
Cold rolling: hot rolled steel coil is used as raw material, and the oxide scale is removed by acid pickling. The finished product is hard rolled coil. Due to the cold work hardening caused by continuous cold deformation, the strength and hardness of the hard rolled coil increase and the toughness and plasticity index decrease. Therefore, the stamping performance will deteriorate and can only be used for parts with simple deformation. The hard rolled coil can be used as the raw material of hot galvanizing plant, because the annealing line is set in the hot galvanizing line. The weight of hard rolled coil is generally 6-13.5 tons. The hot-rolled pickling coil is continuously rolled at room temperature. The hardness of hard rolled plate is very high (HRB is more than 90) and its machining performance is very poor because it has not been annealed. It can only be processed by simple directional bending (perpendicular to the coiling direction).
In short, cold-rolled sheet is processed and rolled on the basis of hot-rolled coil. Generally speaking, it is hot rolling, pickling and cold rolling.
Because cold rolled sheet is processed from hot rolled plate at normal temperature, although the steel plate will be heated due to rolling in the process, people still call the steel plate produced by this production process as cold rolled plate. Due to the continuous cold deformation of hot rolled plate, the mechanical properties of cold rolled sheet are poor and the hardness is too high. It must be annealed to restore its mechanical properties, so we usually use the cold-rolled sheet after annealing treatment, so the hardness is lower than the hot-rolled plate, and the toughness is better than the hot-rolled plate, and the surface quality is much better! Without annealing is called rolling hard coil, rolling hard coil is generally used to do without bending, stretching products.
Cold rolled plate
Cold rolled ordinary steel sheet
Cold rolled steel sheet is the abbreviation of common carbon structural steel cold rolled sheet, commonly known as cold plate. It is a hot-rolled steel strip of ordinary carbon structural steel, which is further cold-rolled into steel plate with thickness less than 4mm. Due to the fact that no scale is produced during rolling at room temperature, the cold plate has good surface quality, high dimensional accuracy, and annealing treatment, its mechanical and technological properties are better than that of hot-rolled sheet steel. In many fields, especially in the field of home appliance manufacturing, it has gradually replaced hot-rolled sheet steel.
Applicable grades: Q195, Q215, Q235, Q275.
Symbol: q-code for yield point (limit) of ordinary carbon structural steel, which is the upper and lower case of the first Chinese phonetic alphabet of “Qu”; 195, 215, 235, 255 and 275 respectively represent the values of their yield point (limit), unit: MPa (n / mm2); due to the comprehensive mechanical properties such as strength, plasticity, toughness and weldability of Q235 steel, it is the most common carbon structural steel It can better meet the general requirements, so it is widely used.
Cold rolled high quality steel sheet
Like cold-rolled ordinary steel sheet, cold-rolled high-quality carbon structural steel sheet is also the most widely used steel sheet in cold plate. Cold rolled high-quality carbon steel sheet is made of high-quality carbon structural steel, and the thickness is less than 4mm after cold rolling.
Applicable grades: 08, 08F, 10, 10F.
Symbols: 08,10-two digits at the beginning of steel grade indicate carbon content of steel, expressed by average carbon content × 100; f-non deoxidized boiling steel; B-sEmi killed steel; z-general deoxidized killed steel (sometimes without letters).
For example, 08F means non deoxidized rimmed steel with an average carbon content of 0.08%; because of its good plasticity and stamping performance, 08F steel plate is mostly used to manufacture sheet metal products with drawing structure.
Drawing grade: z-deepest drawing grade, s-deep drawing grade, p-ordinary drawing grade
Surface quality: I – advanced finishing surface, II – higher finishing surface, III – common finishing surface
Cold rolled steel sheet for deep drawing
Deep drawing cold rolled steel sheet is mostly made of Killed Steel Deoxidized by aluminum, which belongs to high quality carbon structural steel. Because of its good plasticity and excellent deep drawing properties, it is widely used in the products which need more complicated structure.
Applicable grade: 08A1.
Symbol: 08 – two digits at the beginning of steel grade indicate carbon content of steel, expressed by average carbon content × 100; A1 – Killed Steel Deoxidized by aluminum.
Surface quality: I – special advanced finishing surface, II – advanced finishing surface, III – higher finishing surface.
Drawing performance level: ZF – drawable most complex parts, HF – drawable very complex parts, F – drawable complex parts.
Cold rolled carbon steel sheet in Japan
Applicable brands: SPCC, SPCD, spce
Symbols: S-STEEL, plate, cold, common, draw, elongation
Heat treatment state: a-annealed, s-annealed + flat, 8 – (1 / 8) hard, 4 – (1 / 4) hard, 2 – (1 / 2) hard, 1-hard.
Drawing performance level: ZF – for stamping and drawing the most complex parts, HF – for stamping and drawing very complex parts, F – for stamping and drawing complex parts.
Surface processing state: d-pitted surface (the roll is shot peened after being processed by grinder), B-Bright surface (the roller is finished by grinder).
Surface quality: FC – advanced finishing surface, FB – higher finishing surface. Status, surface processing status, surface quality code, drawing level (only for spce), product specifications and dimensions, shape accuracy (thickness and / or width, length, unevenness).
German cold rolled carbon steel sheet
Applicable grades: ST12, ST13, ST14, St15, st14-t
Symbols: St steel, 12 ordinary cold rolled sheet, 13 stamping cold rolled sheet, 14 deep drawing cold rolled sheet, 15 extra deep drawing cold rolled sheet, 14 t super cold rolled sheet.
Surface quality: FC – advanced finishing surface, FB – higher finishing surface.
Surface structure: b-particularly smooth, g-smooth, m-dull, r-rough.
Cold rolled carbon steel sheet in Russia
Applicable grades: ct-3k П, 08k П, 08 П C
Symbols: CT ordinary steel, K П – rimmed steel, П C – killed steel.
Hot rolled plate
The thickness of hot-rolled plate used for stamping production is generally ≤ 16mm, and deep stamping is generally ≤ 8mm. The surface quality of hot rolled plate can be divided into FA and FB. The surface treatment methods of hot rolled plate can be pickling surface and non pickling surface.
The surface of hot-rolled carbon steel plate is mostly made of high-quality non pickling steel. High quality carbon structural steel is carbon steel with carbon content less than 0.8%. The steel contains less sulfur, phosphorus and non-metallic inclusions than carbon structural steel, and has better mechanical properties. According to the carbon content, it can be divided into three types: low carbon steel (C ≤ 0.25%), medium carbon steel (C = 0.25-0.6%) and high carbon steel (c > 0.6%). According to the different manganese content, they were divided into two groups: normal manganese content (0.25% – 0.8%) and high manganese content (0.70% – 1.20%). The latter has better mechanical properties and processing properties. This kind of plate is mostly used in automobile, aviation industry and other departments. The grades of its steel are rimming 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.
Hot rolled pickling plate is an intermediate product with high quality hot-rolled sheet as raw material. After removing oxide layer, trimming and finishing by pickling line, the surface quality and application requirements (mainly cold bending forming or stamping performance) are between hot-rolled plate and cold-rolled plate. It is an ideal substitute for some hot-rolled plate and cold-rolled plate. Compared with hot-rolled plate, the advantages of pickling plate are as follows: 1) good surface quality, because the surface oxide scale is removed, the surface quality of steel is improved, and it is convenient for welding, oiling and painting. 2) The size precision is high. After leveling, the plate shape can be changed to reduce the unevenness deviation. 3) The surface finish is improved and the appearance effect is enhanced. 4) It can reduce the environmental pollution caused by dispersed pickling. Compared with cold rolled sheet, the advantage of pickling sheet is that it can effectively reduce the purchase cost under the premise of ensuring the surface quality. At present, many enterprises put forward higher and higher requirements for high performance and low cost of steel. With the continuous progress of rolling technology, the properties of hot rolled sheet are close to that of cold rolled sheet, which makes “replacing cold with hot” technically. It can be said that pickling plate is a kind of product with high performance price ratio between cold rolled plate and hot rolled plate, which has a good market development prospect. However, at present, the use of pickling plate in various industries in China has just started, and the professional pickling plate production started from Baosteel’s pickling production line in September 2001.
The pickling plate market is mainly reflected in the following four aspects: substitution of cold rolling, substitution of hot rolling, substitution of import and substitution of small pickling. The substitution of import and small pickling is actually an existing market, and the market is limited and can not be completely replaced. With the rapid development of automobile, machinery, light industry and other industries, enterprises are facing the huge pressure brought by the market competition, and the requirements for product cost and product quality are increasing day by day. Pickling plate completely replaces part of cold plate and hot plate with its high cost performance ratio, which will be gradually recognized by users. The surface of pickling hot rolled plate can be coated with oil for rust prevention.
The brand of hot rolled plate in Japan is usually expressed as SPHC — the first s is the abbreviation of steel steel, P is the abbreviation of plate, h is the abbreviation of hot heat, and C is the abbreviation of commercial commercial.
SPHD — hot rolled steel plate and strip for stamping; sphe — hot rolled steel plate and strip for deep drawing.
Hot dip galvanized steel sheet
Continuous hot dip galvanized steel sheet
Continuous hot-dip galvanized steel sheet, abbreviated as galvanized sheet or white iron sheet, is cold-rolled continuous hot-dip galvanized steel sheet and strip with thickness of 0.25-2.5mm. The steel strip first burns off residual oil on the surface through the preheating furnace heated by flame, and forms iron oxide film on the surface, and then enters the reduction annealing furnace containing H2 and N2 to heat to 710 ~ 920 ℃, so that the iron oxide film is reduced to sponge iron, and the surface is activated and purified After the strip is cooled to a temperature slightly higher than the molten zinc, it enters the zinc pot at 450 ~ 460 ℃, and the surface thickness of zinc layer is controlled by air knife. Finally, it was passivated by chromate solution to improve the white rust resistance.
The steel plate has good corrosion resistance, good corrosion resistance, and good corrosion resistance. Compared with the surface of electroplated zinc plate, the coating is thicker, which is mainly used for pulling gold parts with strong corrosion resistance.
Applicable grades: zn100 Pt, ZN200 SC, zn275 JY.
Structure classification code: z-normal zinc flake: it is obtained by crystallization according to normal cooling rate, which can be used for general purpose: X-Small zinc flake: after finishing, the cooling small zinc flake is suitable for deep drawing and ultra deep drawing processing and occasions with low surface roughness requirements.
Processing performance code: Pt general purpose, JY mechanical bite, SC deep drawing, CS ultra deep drawing, JY structure.
Zinc coating weight code: Z100, z200, z275; zinc coating weight refers to the total zinc content on both sides of the steel plate, expressed in grams of zinc per square meter of steel plate (g / m2), for example, Z100 means its zinc content is not less than 100g / m2.
Japan hot dip galvanized steel sheet
Applicable grades: SGCC, sgcd1, sgcd2, sgcd3.
Zinc layer code: Z12, Z18, z20, Z22, z25, z27.
Symbols: S-STEEL, g-cold, fourth c-common, d-draw; 1, 2-stamping, 3-deep drawing; z-zinc, 12 The amount of 27 zinc attached was 10 g / m2.
German hot dip galvanized steel sheet
Applicable grades: ST01Z, st02z, st03z, st04z, st05z.
Zinc layer code: 100, 180, 200, 275, 350, 450.
Symbols: St steel, 01 for general use, 02 for mechanical bite, 03 for stamping, 04 for deep drawing, 05 for deep drawing; z-zinc coating (zinc); 100 zinc adhesion (two sides) 100g / m2, 275 zinc adhesion 275h / m2, 350 zinc adhesion 350g / m2.
Surface structure code: z-regular zinc flower, X-Small zinc flower, g-smooth zinc flower.
Surface treatment code: l-chromate passivation, y-oiling, ly chromate passivation and oiling.
Surface quality code: fa – common grade, FB – higher level, FC – advanced.
Dimension and shape accuracy Code: thickness: Pt. A – general precision, Pt. B – advanced precision; width: PW. A – general precision, Pb. B – advanced precision; length: pl. a – ordinary precision, pl. B – advanced precision; unevenness: PF. A – ordinary precision, PF. B – advanced precision.
Galvanized steel sheet
Continuous electro galvanizing cold rolled steel sheet
It refers to the process that zinc is continuously deposited from the deep water solution of zinc salt to the prepared steel strip performance under the action of electric field on the galvanizing line to obtain the surface zinc coating.
Applicable grades: dx1, DX2, DX3, DX4.
Zinc layer code: 14, 28, 42, 56, 70, and its two digits indicate the adhesion amount of zinc on the steel plate surface (g / m2).
Symbols: d-plating, x-zinc, 1-commercial grade, 2-stamping grade, 3-deep stamping, 4-structural grade.
Rolling accuracy Code: a – advanced precision, B – general precision.
Surface treatment code: p-phosphate treatment, c-chromic acid treatment, o-oiling, n-fingerprint resistant treatment.
Galvanized steel sheet in Japan
Applicable brands: SECC (original board SPCC), SECD (original board SPCD), sece (original board spce)
Zinc layer code: E8, E16, E24, E32.
Symbols: S-STEEL, e-electroposition, c-cold rolling, common, draw and elongation.
Zinc layer code: e-zinc coating, 8, 16, 24, 32 denote zinc adhesion, unit: g / m2, coating thickness (single side) 1.4 μ, 4.2 μ, 7.0 μ.
Surface treatment code: c-chromate treatment, o-oiling, p-phosphoric acid treatment, s-chromic acid system treatment + oiling, q-phosphoric acid system treatment + oiling, m-non-treatment.
Electroplated tin sheet and strip, also known as tinplate, abbreviated as spte, refers to cold-rolled low-carbon steel sheet or strip coated with commercial pure tin on both sides, usually with thickness ≤ 0.6mm. Tin is mainly used to prevent corrosion and rust. It combines the strength and formability of steel with the corrosion resistance, solderability and beautiful appearance of tin in one material. It has the characteristics of corrosion resistance, non toxicity, high strength and good ductility. It can be used as packaging material of can, inner and outer sheath of cable, instrument and telecommunication parts, flashlight and other hardware.
Stainless steel plate
Steel resistant to weak corrosive medium such as air, steam, water and chemical etching medium such as acid, alkali and salt. Also known as stainless acid resistant steel. In practical application, the steel with weak corrosion resistance is often called stainless steel, while the steel resistant to chemical medium corrosion is called acid resistant steel. Due to the difference in chemical composition, the former is not necessarily resistant to chemical medium corrosion, while the latter is generally rust free. The corrosion resistance of stainless steel depends on the alloy elements contained in the steel. Chromium is the basic element for stainless steel to obtain corrosion resistance. When the content of chromium in the steel reaches 1.2%, a thin oxide film (self passivation film) is formed on the surface of steel by the interaction of chromium and oxygen in the corrosive medium, which can prevent further corrosion of steel matrix. In addition to chromium, the common alloy elements are nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various applications on the structure and properties of stainless steel.
Stainless steel is usually divided into three types according to the matrix structure
- 1. Ferritic stainless steel. The chromium content is 12% – 30%. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its chloride stress corrosion resistance is better than other kinds of stainless steel.
- 2. Austenitic stainless steel. It contains more than 18% chromium, about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. It has good comprehensive performance and can resist corrosion of various media.
- 3. Austenitic ferrite duplex stainless steel. It has the advantages of both austenitic and ferritic stainless steels and superplasticity.
- 4. Martensitic stainless steel. High strength, but poor plasticity and weldability.
- 5. Precipitation hardening stainless steel. It has good formability and good weldability, and can be used as ultra-high strength material in nuclear industry, aviation and aerospace industry.
It can be divided into CR system (sus400), Cr Ni system (sus300), Cr Mn Ni (sus200) and precipitation hardening system (sus600)
Source: China Steel Plates Manufacturer – Yaang Pipe Industry (www.steeljrv.com)
(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)
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