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Stainless steel plate

Stainless steel plate

Time:2022-04-07 Source:Wuxi Jianuo Special Steel Co.

Stainless steel plate has a bright surface, high plasticity, toughness and mechanical strength, and is resistant to corrosion by acid, alkaline gases, solutions and other media. It is a kind of alloy steel which is not easy to rust, but not absolutely rust-free. Stainless steel plate is a steel plate that is resistant to corrosion by weak media such as atmosphere, steam and water, while acid-resistant steel plate is a steel plate that is resistant to corrosion by chemically leaching media such as acid, alkali and salt. Stainless steel plate has been introduced since the early 20th century, has a history of more than a century.

Brief introduction

Product Description

Stainless steel plate is generally a general term for stainless steel plate and acid-resistant steel plate. At the beginning of this century, the development of stainless steel plate for the development of modern industry and technological progress has laid an important material and technical foundation. Stainless steel plate steel species, performance varies, it gradually formed in the development process of several major categories. According to the organizational structure is divided into austenitic stainless steel plate, martensitic stainless steel plate (including precipitation hardening stainless steel plate), ferritic stainless steel plate, and austenitic plus ferritic duplex stainless steel plate and other four categories? Classified by the main chemical composition in the steel plate or some characteristic elements in the steel plate, divided into chromium stainless steel plate, chromium-nickel stainless steel plate, chromium-nickel-molybdenum stainless steel plate and low carbon stainless steel plate, high molybdenum stainless steel plate, high purity stainless steel plate, etc.. Classified by the performance characteristics and uses of the steel plate, divided into nitric acid resistant stainless steel plate, sulfuric acid resistant stainless steel plate, pitting resistant stainless steel plate, stress corrosion resistant stainless steel plate, high strength stainless steel plate, etc. According to the functional characteristics of the steel plate classification, divided into low temperature stainless steel plate, non-magnetic stainless steel plate, easy to cut stainless steel plate, super plasticity stainless steel plate, etc.. The common classification method is now classified according to the organizational structure characteristics of the steel plate and the chemical composition characteristics of the steel plate and the combination of the two methods. Generally divided into martensitic stainless steel plate, ferritic stainless steel plate, austenitic stainless steel plate, duplex stainless steel plate and precipitation hardening stainless steel plate, or into two categories of chromium stainless steel plate and nickel stainless steel plate. The use is very wide typical use: pulp and paper with equipment heat exchangers, machinery and equipment, dyeing equipment, film processing equipment, pipelines, coastal areas of the exterior of buildings with materials.

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Stainless steel plate has a bright surface, high plasticity, toughness and mechanical strength, and is resistant to corrosion by acid, alkaline gases, solutions and other media. It is an alloy steel that does not rust easily, but is not absolutely rust-free.

Performance

Corrosion resistance

Stainless steel plate has the ability to resist general corrosion similar to the unstable nickel-chromium alloy 304. Prolonged heating in the temperature range of the chromium carbide degree may affect alloys 321 and 347 in harsh corrosive media. Primarily used in high temperature applications, high temperature applications require materials with strong resistance to sensitization to prevent intergranular corrosion at lower temperatures.

High-temperature oxidation resistance

Stainless steel sheets all have high temperature oxidation resistance, however, the oxidation rate will be affected by the exposure environment as well as inherent factors such as product form.

Physical Properties

The total heat transfer coefficient of a metal depends on other factors in addition to the thermal conductivity of the metal. In most cases, the film heat dissipation coefficient, the rust skin and the surface condition of the metal. Stainless steel can keep the surface neat, so it has better heat transfer than other metals with higher thermal conductivity. Liaocheng Sandeli stainless steel provides eight, the technical standards of stainless steel plate stainless steel plate corrosion resistance, bending process performance and welded parts toughness, as well as the welded parts of the stamping process excellent performance of high-strength stainless steel plate and its manufacturing method. Specifically, it contains C: 0.02% or less, N: 0.02% or less, Cr: 11% or more less than 17%, the appropriate content of Si, Mn, P, S, Al, Ni, and meet 12 ≤ Cr Mo 1.5Si ≤ 17, 1 ≤ Ni 30 (C N) 0.5 (Mn Cu) ≤ 4, Cr 0.5 (Ni Cu) 3.3Mo ≥ 16.0, 0.006 ≤ C N ≤ 0.030 stainless steel plate heated to 850 ~ 1250 ℃, and then heat treatment with a cooling rate of more than 1 ℃ / s cooling. This can become a high strength stainless steel plate containing more than 12% volume fraction of martensite organization, more than 730 MPa of high strength, corrosion resistance and bending processability, and excellent toughness in the heat-affected zone of welding. Then use contains Mo, B, etc., can significantly improve the welded part of the stamping process performance.

The flame of oxygen plus gas can not cut stainless steel plate because stainless steel is not easily oxidized.

Elemental role

Carbon (C): 1. to improve the blade deformation resistance and tensile strength; 2. to enhance the hardness and improve the ability to resist wear.

Chromium (Cr): 1. increase hardness, tensile strength and toughness; 2. antiwear and corrosion.

Cobalt (Co): 1. increases hardness and strength to withstand high temperature quenching; 2. used in more complex alloys to strengthen certain individual properties of other elements.

Copper (Cu): 1. enhance corrosion resistance; 2. enhance wear resistance.

Manganese (Mn): 1. increases hardenability, wear resistance and tensile strength; 2. carries away oxygen from molten metal by separating oxidation and separating vaporization; 3. enhances hardness but increases brittleness when added in large quantities.

Molybdenum (Mo): 1. enhance the strength, hardness, hardenability and toughness; 2. improve machinability and corrosion resistance.

Nickel (Ni): 1. enhance the strength, hardness and corrosion resistance.

Phosphorus (P): Enhance strength, machinability and hardness. 2.

2. Easy to brittle and crack when concentration is too high

Silicon (Si): 1. enhances ductility; 2. increases tensile strength; 3. removes oxygen from molten metal by separating oxidation and vaporization.

Sulfur (S): small amounts can improve machinability.

Tungsten (W): Increase strength, hardness and toughness.

Vanadium (V): Increases strength, hardness and shock resistance.

Corrosion conditions

1. the surface of stainless steel containing other metal elements of the dust or foreign metal particles of adhesion, in the humid air, adhesion and stainless steel between the condensate, the two will be connected into a microcell, triggering an electrochemical reaction, the protective film is damaged, called electrochemical corrosion.

2. stainless steel surface adhesion of organic matter juice (such as squash, noodle soup, spit, etc.), in the case of water oxygen, constitute organic acid, a long time then organic acid corrosion of the metal surface.

3. stainless steel surface adhesion containing acid, alkali, salt substances (such as decorative walls of alkaline water, lime water spray), causing local corrosion.

4. In the polluted air (such as containing a large number of sulfides, carbon dioxide, nitrogen oxide atmosphere), condensation, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion of the above can cause damage to the surface of stainless steel protective film caused by rust.

Corrosion resistance

Stainless steel plate corrosion resistance mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, manganese, etc.) and internal organization, the main role is played by the element chromium. Chromium has a high chemical stability, can form a passivation film on the steel surface, so that the metal and the outside world isolated, to protect the steel plate from oxidation, increase the corrosion resistance of the steel plate. After the passivation film is destroyed, the corrosion resistance decreases.

Marking method

Numbering and representation method

① Use the international chemical element symbol and the symbol of the country to indicate the chemical composition, using Arabic letters to indicate the content of the composition.

For example: China, Russia 12CrNi3A

② with a fixed number of digits to indicate the steel series or numbers; such as: the United States, Japan, 300 series, 400 series, 200 series.

③ with Latin letters and order to form a serial number, only to indicate the use.

International stainless steel labeling methods

American Iron and Steel Institute is a three-digit number to label various standard grades of malleable stainless steel. Among them.

① austenitic stainless steel with 200 and 300 series of digital labeling.

② ferritic and martensitic stainless steel with 400 series of numbers. For example, some of the more common austenitic stainless steels are marked with 201, 304, 316, and 310.

③ ferritic stainless steel is marked by 430 and 446, martensitic stainless steel is marked by 410, 420 as well as 440C, duplex (austenitic-ferritic).

④Stainless steels, precipitation-hardening stainless steels, and high alloys containing less than 50% iron are usually named using patented names or trademarks.

Selection essentials

Select stainless steel plate to consider the use of operating conditions, such as manual or automatic operation, the performance and type of hot press, the quality requirements of the pressed material such as hardness, gloss, etc.. Also consider the economic accounting, each time a new polished steel plate, the number of times required to produce a slow quality decorative plate.

In addition, when choosing the most reasonable thickness of the steel plate, should consider its use time, quality, stiffness, while taking into account the strength requirements when the plate is pressed; heat transfer performance; distribution of pressure, the width of the pressed plate specifications.

If the thickness of the steel plate is not enough, it is easy to bend and will affect the production of decorative plates. If the thickness is too large, the steel plate is too heavy, not only to increase the cost of the steel plate, but also to the operation will bring no need to play the difficulties. Also consider the margin that should be left when processing or using the stainless steel plate. The thickness of the copper plate is not absolutely consistent, but strive to be as consistent as possible in the thickness of the same steel plate, the general medium size saw plate, thickness tolerance of 0.05 a o.15 mm. If the requirements are too strict, grinding costs will also increase. Generally is a large tension resistance, hardness of the structure of the steel plate, the greater the resistance to mechanical damage performance, the use of longer durability, but the grinding execution processing costs are also relatively high [1] .

Classification Editor Podcast

By thickness

(1) Thin plate (0.2mm-4mm) (2) Medium plate (4mm-20mm) (3) Thick plate (20mm-60mm) (4) Extra thick plate (60-115mm)

By production method

(1) Hot rolled steel plate (2) Cold rolled steel plate

NO.1

Silvery white

Lusterless

Hot-rolled to specified thickness

Applications where surface gloss is not required

NO.2D

Silvery white

Heat treated and pickled after cold rolling

General purpose, deep-drawn material

NO.2B

Brighter than NO.2D

After NO.2D treatment, the final light cold rolling process is carried out by polishing rolls.

General purpose

BA

Bright as a mirror

No standard, but usually a bright annealed surface finish with high surface reflectivity.

Construction materials, kitchen utensils

NO.3

Rough grinding

Grind with 100-200# (unit) grinding belt.

Construction materials, kitchenware

NO.4

Intermediate grinding

Polished surface obtained by grinding with 150~180# grinding belt

Same as above

NO.240

Fine grinding

Grinded with 240# grinding belt

Kitchen utensils

NO.320

Very fine grinding

Grinding with 320# grinding belt

Same as above

NO.400

Brightness close to BA

Polishing with 400# polishing wheel

General materials, construction materials, kitchenware

HL

Hairline polishing

Abrasive polishing is performed on materials with appropriate grains (150-240#).

Building and construction materials

NO.7

Near mirror polishing

Polishing with 600# rotary polishing wheel

For art and decoration

NO.8

Mirror polishing

Mirror polishing with polishing wheel

Reflective mirror, for decoration

By application

(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) Solar special plate (Hai Rui special steel) (11) Other II. Common Japanese grades of steel plates for general and mechanical structures.

By steel organization

(1) Austenitic type (2) Austenitic-ferritic type (3) Ferritic type (4) Martensitic type, and

JIS

The first part of the Japanese steel grade (JIS series) consists of three parts: S (Steel) for steel, F (Ferrum) for iron; the second part indicates the different shapes, types, and uses, such as P (Plate) for plate, T (Tube) for pipe, and K (Kogu) for tool; and the third part indicates the characteristic numbers. generally for the minimum tensile strength. For example: SS400 – the first S means steel (Steel), the second S means “structure” (Structure), 400 is the lower limit of tensile strength 400MPa, the whole indicates the tensile strength of 400MPa ordinary Structural steel.

SPHC

SPHC – The first S is the abbreviation of Steel, P is the abbreviation of Plate, H is the abbreviation of Heat, C is the abbreviation of Commercial Commercial, and the whole indicates hot rolled steel plates and strips for general use.

SPHD

SPHD – indicates hot-rolled steel sheets and strips for stamping.

SPHE

SPHE–indicates hot rolled steel sheets and strips for deep drawing.

SPCC

SPCC–indicates cold-rolled carbon steel sheet and strip for general use, equivalent to Q195A grade. The third letter C is the abbreviation of Cold Cold. When the tensile test is needed, add T to the end of the grade for SPCCT.

SPCD

SPCD – indicates cold rolled carbon steel sheet and strip for stamping, equivalent to China 08AL (13237) high quality carbon structural steel.

SPCE

SPCE–Indicates cold rolled carbon steel sheet and strip for deep drawing, equivalent to China 08AL (5213) deep drawing steel. Need to ensure non-aging, add N to the end of the grade for SPCEN. Cold rolled carbon steel sheet and strip tempering code: annealed state for A, standard tempering for S, 1/8 hard for 8, 1/4 hard for 4, 1/2 hard for 2, hard for 1. Surface finish code: lusterless fine rolled for D, bright fine rolled for B. SPCC-SD indicates standard tempered, lusterless fine rolled cold rolled carbon sheet for general use. Then SPCCT-SB indicates the standard tempering, bright processing, the requirement to ensure the mechanical properties of cold-rolled carbon sheet.

JIS mechanical structural steel grades are expressed as follows: S + carbon content + letter code (C, CK), where the carbon content is expressed in the middle value × 100, the letter C: indicates carbon K: indicates carburized steel. Such as carbon knotted coil S20C its carbon content of 0.18-0.23%. Third, China and Japan’s silicon steel sheet grade representation.

Chinese Grades

(1) Cold-rolled non-oriented silicon steel strip (sheet) expression: DW + iron loss value (in the frequency of 50HZ, the waveform is sinusoidal magnetic inductance peak value of 1.5T per unit weight iron loss value.) 100 times the value of the thickness of 100 times. For example, DW470-50 indicates that the iron loss value is 4.7w/kg, and the thickness is 0.5mm of cold-rolled non-oriented silicon steel, now the new model is 50W470.

(2) cold-rolled oriented silicon steel strip (sheet) expressed: DQ + iron loss value (in the frequency of 50HZ, waveform is sinusoidal magnetic inductance peak value of 1.7T per unit weight iron loss value.) of 100 times + 100 times of the thickness value. Sometimes G is added after the iron loss value to indicate high magnetic susceptibility. For example, DQ133 indicates that the iron loss value is 1.33, the thickness of 0.3mm cold-rolled oriented silicon steel strip (sheet), now the new model is 30Q133.

(3) hot-rolled silicon steel plate hot-rolled silicon steel plate with DR, according to the amount of silicon content into low silicon steel (silicon content ≤ 2.8%), high silicon steel (silicon content > 2.8%). Expression method: 100 times of DR + iron loss value (the iron loss value per unit weight when the maximum value of magnetic induction intensity is 1.5T with 50HZ repeated magnetization and sinusoidal change) + 100 times of thickness value. For example, DR510-50 means the iron loss value is 5.1, and the thickness is 0.5mm of hot-rolled silicon steel plate. The grade of hot-rolled silicon steel sheet for household appliances is expressed by JDR + iron loss value + thickness value, such as JDR540-50.

Japanese Grades

(1) Cold-rolled non-oriented silicon steel strip by nominal thickness (expanded by 100 times the value) + code A + iron loss guarantee value (the value after expanding the iron loss value by 100 times when the frequency is 50HZ and the maximum magnetic flux density is 1.5T). Such as 50A470 indicates that the thickness of 0.5mm, iron loss guarantee value of ≤ 4.7 cold-rolled non-oriented silicon steel strip.

(2) Cold-rolled oriented silicon steel strip from the nominal thickness (expanded by 100 times the value) + code G: indicates ordinary material, P: indicates highly oriented material + iron loss guarantee value (frequency 50HZ, the maximum flux density of 1.7T, the value of iron loss after expanding 100 times the value). For example, 30G130 indicates the cold-rolled oriented silicon steel strip with thickness of 0.3mm and guaranteed iron loss value of ≤1.3. Liaocheng Sandeli stainless steel provides four, electroplated tin plate and hot dip galvanized plate: 1, electroplated tin plate

Tin-plated thin steel plate and strip, also known as tinplate, kind of steel plate (strip) surface plated with tin, has good corrosion resistance, and non-toxic, can be used as packaging materials for cans, cable sheathing inside and outside, instrumentation and telecommunications parts, small hardware such as electric torches.