430 stainless steel is a general steel with good corrosion resistance, good thermal conductivity than austenite, thermal expansion coefficient is smaller than austenite, heat resistance fatigue, add stabilizing element titanium, good mechanical properties of weld parts. 430 stainless steel is used for building decoration, fuel burner parts, household appliances, household appliance parts. 430F is 430 steel with easy cutting properties, mainly used in automatic lathes, bolts and nuts. 430LX added Ti or Nb in 430 steel, reduce C content, improve the processing performance and welding performance, mainly used in hot water tanks, heating water systems, sanitary appliances, household durable appliances, bicycle flywheels and so on.

It is also called 18/0 or 18-0 because of its chromium content. Compared with 18/8 and 18/10, it contains slightly less chromium and correspondingly reduces hardness.

Chinese name 430 stainless steel 1Cr17 stainless steel will not produce corrosion, pitting, corrosion or wear. A container, such as a pot, bowl, or basin, for holding food. Fuel burner components for building decoration.

directory

1 Chemical composition

2 Mechanical properties

3 Product Specifications

4. Classification and process

▪ surface grade

▪ Characteristic processing technology

5 Material characteristics

6 Stainless steel knowledge

7 Common Species

▪ Austenite

▪ Ferrite

▪ Martensite

8 Stainless Steel Introduction

Chemical composition editor

Carbon (C) :≤0.12%

Silicon (Si) :≤0.75%

Manganese (Mn) :≤1.00%

Phosphorus (P) :≤0.040%

Sulfur (S) :≤0.030%

Nickel (Ni) :≤0.60% (inclusive)

Chromium (Cr) :16.00~18.00%

Mechanical properties editor broadcast

Density: 7.75g/cm³

Melting point: 1427ºC

Expansion coefficient: mm/ºC(at 20-100ºC)

Young's modulus: kN/mm²

Rigidity modulus: kN/mm²

Application standard: n/a (UNS)

Product specifications editor broadcast

Product name

Specification /mm

material

Cold circle

Ф 5.5-30

430 stainless steel

Cold drawing circle

Ф 3.0-100

430 stainless steel

Hot rolled plate

5-100.

430 stainless steel

Hot rolled round steel

Ф. 100-200

430 stainless steel

Hot rolled round steel

Ф 20-100

430 stainless steel

Hot rolled steel plate

1-100.

430 stainless steel

Hot rolled round steel

Ф. 200-400

430 stainless steel

Hot rolled steel plate

4-180.

430 stainless steel

Grading and process editing broadcast

Surface grade

430 stainless steel has the following states, the state is not the same, dirt resistance and corrosion resistance are not the same.

NO.1, 1D, 2D, 2B, N0.4, HL, BA, Mirror, and a variety of other surface treatment states.

Feature processing technology

1D -- has discontinuous granular surface, also known as fog surface. Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling.

2D -- A slightly glossy silvery white. Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling.

2B -- silvery white and better gloss and flatness than 2D surfaces. Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + tempering rolling.

BA - Good surface gloss, high reflectivity, like a mirror surface. Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + surface polishing + tempering rolling.

No.3 -- Good gloss, coarse grain surface. Processing technology: 2D or 2B products are polished and rolled with 100~120 grinding materials (JIS R6002).

No.4 -- Good gloss, fine surface lines. Processing technology: 2D or 2B products are polished and rolled with 150~180 grinding materials (JIS R6002).

HL -- Silver gray and streaked. Processing technology: The 2D product or 2B product is polished with the appropriate particle size of the grinding material to make the surface of the continuous grinding.

MIRRO - Mirror state. Processing technology: 2D product or 2B product with appropriate granularity of grinding materials for grinding and polishing to mirror effect.

Material properties edit broadcast

430 stainless steel has oxidation resistance to corrosion, but has a tendency to intergranular corrosion.

430 stainless steel wire is widely used in axis.

Because it is safe and non-toxic, it is widely used in food tableware.

Stainless Steel knowledge editor broadcast

Stainless Steel (Stainless Steel) refers to air, steam, water and other weak corrosive medium and acid, alkali, salt and other chemical etched medium corrosion of steel, also known as stainless acid resistant steel. In practical application, the steel with weak corrosion resistance is often called stainless steel, and the steel with chemical corrosion resistance is called acid-resistant steel. Because of the difference in chemical composition, the former is not necessarily resistant to corrosion of chemical media, while the latter is generally rust proof. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel.

Types of stainless steel

Stainless steel is often divided into: martensitic steel, ferritic steel, austenitic steel, etc. In addition, it can be divided into chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel according to the composition.

1, ferritic stainless steel: chromium 12% ~ 30%. Its corrosion resistance, toughness and welderability are improved with the increase of chromium content, and its resistance to chloride stress corrosion is better than other kinds of stainless steel.

This category includes Crl7, Cr17Mo2Ti, Cr25, Cr25Mo3Ti, Cr28, etc. Because of its high chromium content, ferritic stainless steel has good corrosion resistance and oxidation resistance, but its mechanical and technological properties are poor. It is mostly used for acid-resistant structures with little force and as anti-oxidation steel. This kind of steel can resist the corrosion of atmosphere,  and brine solution, and has the characteristics of high temperature oxidation resistance, low thermal expansion coefficient and so on. It is used forand food factory equipment, and can also make parts working at high temperature, such as gas turbine parts.

2, austenitic stainless steel: chromium more than 18%, but also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good comprehensive performance, can withstand the corrosion of a variety of media. Austenitic stainless steel commonly used brands are 1Cr18Ni9, 0Cr19Ni9 and so on. wC of 0Cr19Ni9 steel is less than 0.08%, marked as "0" in steel number. Such steels contain large amounts of Ni and Cr, giving the steel an austenitic state at room temperature. This kind of steel has good plasticity, toughness, weldability and corrosion resistance, corrosion resistance in oxidizing and reducing media are good, used to make acid resistant equipment, such as corrosion resistant vessels and equipment lining, pipeline,  resistant equipment parts. Austenitic stainless steel is generally treated with solid solution, that is, the steel is heated to 1050 ~ 1150ºC and then cooled by water to obtain single-phase austenitic structure.

3, austenitic ferritic stainless steel: both austenitic and ferritic stainless steel advantages, and has superplasticity.

Austenitic and ferritic structures each comprise about half of stainless steel. In the case of low C content, Cr content is 18%-28%, and Ni content is 3%-10%. Some steels also contain Mo, Cu, Si, Nb, Ti, N and other alloying elements. This kind of steel has the characteristics of austenitic and ferritic stainless steel, compared with ferritic, plasticity, toughness is higher, no room temperature brittleness, intercrystalline corrosion resistance and welding performance are significantly improved, but also maintain the ferritic stainless steel 475ºC brittleness and high thermal conductivity, with the characteristics of superplasticity. Compared with austenitic stainless steel, it has higher strength and better resistance to intergranular corrosion and chloride stress corrosion. Duplex stainless steel has excellent corrosion resistance, is also a nickel stainless steel.

4. Martensitic stainless steel: high strength, but poor plasticity and weldability.

The commonly used brands of martensitic stainless steel are 1Cr13, 3Cr13, etc., because of the higher carbon content, it has higher strength, hardness and wear resistance, but the corrosion resistance is slightly poor, used for some parts with higher mechanical properties and general corrosion resistance requirements, such as springs, turbine blades, hydraulic press valves. This kind of steel is used after quenching and tempering treatment.

Stainless steel adjustment calculation formula

Stainless steel bar weight = diameter mm* diameter mm*0.00623=kg/m

Stainless steel hexagonal bar weight = opposite side mm× opposite side mm×0.0069=kg/m

Stainless steel block/plate weight = Length m* Width m* height mm*7.93 (201 202 301 302 304 304L 305 310 321) = Total weight (kg)

Length m* Width m* Height mm*7.98 (309S 310S 316 316L 347) = Total weight (kg)

Length m* Width m* height mm*7.75 (405 410 420) = Total weight (kg)

Length m* Width m* Height mm*7.70 (409 430 434) = Total weight (kg)

Stainless steel square bar/flat steel weight = side width (thickness) mm* side width mm*0.00793=kg/m

Stainless steel tube weight = (outer diameter mm- wall thickness mm) * wall thickness mm*0.02491=kg/m

Stainless Angle weight = side length mm* side length mm*7.8*0.000198=kg/m

Stainless steel rectangular tube weight = (length mm+ width mm) *2/1000* Thickness mm*7.93=kg/m

Stainless steel square tube weight = (side length mm*4/3.14- thickness mm) * thickness mm*0.02491=kg/m

Common types of editing broadcast

austenite

301, 302, 303, 303se, 304, 304L, 304N1, 304N2, 304LN, 305, 309S, 310S, 316, 316L, 316N, 316J1, 316J1L, 317, 317L, 317J1 , 321, 347, XM7, XM15J1, 329J1

ferrite

405, 430, 430F, 434, 447J1, 403

martensite

410410L 405 416 410J1 420J1 420J2 420F 431 440A 440B 440C 440F 630 631 632

There is also a kind of stainless steel, 201, 202, 203, 204, chromium low, manganese high, (chromium high energy increase corrosion resistance, manganese high can make the material no magnetic) This stainless steel corrosion resistance is poor, generally used for dry environment decoration.

Stainless Steel introduction editor broadcast

Stainless steel action

Stainless steel does not cause corrosion, pitting, rust or wear. Stainless steel is also one of the strongest building metals. Because of its excellent corrosion resistance, stainless steel enables structural components to maintain engineering integrity permanently. Chrome-containing stainless steel also has mechanical strength and high extensibility, and is easy to manufacture parts to meet the needs of architects and structural designers.

Typical use of stainless steel

Most of the requirements are to maintain the original appearance of the building for a long time. In determining the type of stainless steel to be selected, the main consideration is the required aesthetic standards, the corrosion of the location of the atmosphere and the cleaning system to be used.

However, other applications increasingly seek only structural integrity or impermeability. For example, the roofs and side walls of industrial buildings. In these applications, the owner's cost of construction may be more important than aesthetics, even if the surface is not very clean.

304 stainless steel works quite well in dry indoor environments. However, in rural and urban areas, it is necessary to wash frequently if it wants to maintain its appearance outdoors. In heavily polluted industrial areas and coastal areas, the surface can be very dirty and even rust. But to achieve the aesthetic effect in the outdoor environment, it is necessary to use nickel-containing stainless steel. Therefore, 304 stainless steel is widely used in curtain wall, side wall, roof and other architectural purposes, but in the serious erosion of the industrial or Marine atmosphere, the best use of 316 stainless steel.

Stainless steel sliding door

The advantages of using stainless steel in structural applications have been fully recognized. 304 and 316 stainless steel are included in several design guidelines. Because "duplex" stainless steel 2205 has combined good atmospheric corrosion resistance with high tensile strength and elastic limit strength, this steel is also included in the European guidelines.

Product shape

In fact, stainless steel is manufactured in all standard metal shapes and sizes, and there are many special shapes. The most commonly used products are made of sheet and strip steel, as well as medium and thick plates for special products, for example, hot rolled structural sections and extruded structural sections. There are also round, oval, square, rectangular and hexagonal welded pipe or seamless steel pipe and other forms of products, including profiles, bars, wires and castings.

Stainless steel surface condition

As will be discussed later, a number of different commercial finishes have been developed to meet the aesthetic requirements of architects. For example, the surface can be highly reflective or dull; It can be smooth, polished or embossed; It can be colored, colored, electroplated or etched with patterns on the surface of stainless steel, and can also be drawn to meet the various requirements of designers for appearance.

It's easy to keep the surface. Only occasional rinsing will remove dust. Due to good corrosion resistance, it is also easy to remove scrawl contamination or similar other surface contamination.

In engineering, the following methods are often used to prevent intergranular corrosion:

(1) Reduce the carbon content in steel, so that the carbon content in steel is lower than the equilibrium state of the saturated solubility in Austenite, that is, fundamentally solve the problem of chromium carbide (Cr23C6) precipitation on the grain boundary. Generally, the carbon content of steel can be reduced to less than 0.03% to meet the requirements of intergranular corrosion resistance.

(2) Adding Ti, Nb and other elements that can form stable carbide (TiC or NbC) to avoid precipitation of Cr23C6 on the grain boundary can prevent intergranular corrosion of upper austenitic stainless steel.

(3) By adjusting the proportion of austenitic forming elements and ferrite forming elements in steel, the steel has austenitic + ferrite biphase structure, in which ferrite accounts for 5%-12%. The two - phase structure is not easy to produce intergranular corrosion.

(4) The appropriate heat treatment process can prevent intergranular corrosion and obtain the best corrosion resistance.

Stress corrosion of austenitic stainless steel

Stress Corrosion cracking (SCC) caused by the combined action of stress (mainly tensile stress) and corrosion is called stress corrosion. Austenitic stainless steel is prone to stress corrosion in corrosive media containing chloride ions. When the content of Ni reaches 8%-10%, the stress corrosion tendency of austenitic stainless steel reaches the maximum, and when the content of Ni increases to 45-50%, the stress corrosion tendency gradually decreases until it disappears.

The main way to prevent the stress corrosion of austenitic stainless steel is to add 2~4% Siand control the N content below 0.04% from smelting. In addition, the content of impurities such As P, Sb, Bi and AS should be reduced as far as possible. In addition, A-F two-phase steel can be selected, which is not sensitive to stress corrosion in Cl- and OH- media. The ferrite content should be about 6% when the initial crack does not extend further after encountering the ferrite phase.

Austenitic deformation strengthening of stainless steel

Single phase austenitic stainless steel has good cold deformation properties, can be cold drawn into very thin wire, cold rolled into very thin steel strip or