astm a240 304

Gangsteel produce ASTM A240 304 Stainless steel plates, S30400, A240 Type 304 Stainless steel cutting parts by water cutting, laser cutting and cnc cutting. ASTM a240 (chromium and chromium nickel stainless steel plate, sheet, and for pressure essels and general applications. a240 304 stainless steel is a common material in stainless steel with a density of 7.93g/cm3, which is also called 18 / 8 stainless steel in the industry. High temperature resistant 800 ��, with good processing performance and high toughness, it is widely used in industry, furniture decoration industry and food and medical industry.

Even although wrought austenitic stainless steels are non-magnetic within the annealed situation they may develop magnetic response when cold labored. Most non-ferrous metals similar to aluminium and copper and their alloys are non-magnetic. Austenitic stainless steels, both the widespread 300-sequence (Cr-Ni) and the lower nickel 200-collection (Cr-Mn-Ni) are non-magnetic. It is widespread for wrought austenitic stainless steels to include a very small quantity of ferrite, but this is not adequate to considerably have an effect on magnetic performance except in very crucial functions. Stainless steels have an extended historical past of application involved with water because of their glorious corrosion resistance. Applications embrace a variety of conditions together with , potable water and wastewater therapy, desalination, and brine treatment. Types 304 and 316 stainless steels are commonplace materials of construction in contact with water.

The Chromium in the alloy varieties a self-healing protective clear oxide layer. The self therapeutic nature of the oxide layer means the corrosion resistance stays intact regardless of fabrication methods. Even if the fabric surface is reduce or broken, it will self heal and corrosion resistance will be maintained. The results of cathodic hydrogen charging and subsequent growing older on section transitions and microstructures of quickly solidified austenitic stainless steels were investigated. Scanning and transmission electron microscopy observations indicated that the tendency toward cracking alongside the columnar-like is typical of all the charged RS steels studied. We suggest a mixed magnetic methodology using a scaling power-law rule and preliminary permeability in magnetic minor hysteresis loops for characterization of ferromagnetic α′ martensites in austenitic chrome steel. The scaling energy regulation between the hysteresis loss and remanence is common, being independent of volume fraction of pressure-induced α′ martensites.

Duplex are resistant to stress corrosion cracking, however to not the identical stage as ferritic grades. The toughness of duplex grades is superior to that of the ferritic grades – however inferior to that of the austenitic grades. The magnetic properties of stainless steels range considerably, ranging from paramagnetic, non-magnetic, in fully austenitic grades to onerous or permanent magnetic conduct within the hardened martensitic grades. Low alloy content material chrome steel (significantly that of low nickel, carbon, and/or nitrogen) are extra vulnerable to MSIT then chrome steel with greater alloying components. Type 304 is an instance A240-304 stainless steel plates of a stainless-steel that is fairly prone to forming martensite after chilly working but in reality MSIT impacts all austenitic stainless-steel to some degree or one other. To assist showcase these variations Figures 1 & 2 have been offered to out permeability vs. % cold working as well as magnetism vs. tensile energy of some common stainless steels. Some austenitic chrome steel grades, notably 304, are to a point attracted to a magnet when cold worked, eg by bending, forming, drawing or rolling.

The values may be in contrast with gentle or carbon metal which has a ferritic construction and a relative permeability of at least 200. Transformer steel has a relative permeability of no less than a of thousand. The microstructure of austenitic stainless steel could be changed by a process referred to as martensitic stress induced transformation . This is a microstructural change from austenite to martensite and the transformation can happen as a result of cold working as well as sluggish cooling from austenitizing temperatures. After cold working or gradual cooling an austenitic chrome steel will have an considerable degree of martensitic microstructure. Due to martensite being magnetic, the once nonmagnetic austenitic stainless steel will now have a level of magnetism.

A240 304L Stainless steel plates


A 240 304 Sheet, A 240 304 Plate

SS 304 ASTM Standard Specification

ASTM A240 / ASME SA240


0.1 to 3000 mm Thk




2m, 2.44m, 3m, or as required


2B, 2D, BA NO (8), Cold rolled sheet (CR), Hot rolled plate (HR), SATIN (Met with Plastic Coated), No.1 finish hot rolled, 1D, 2B, No.4, BA, 8K, satin, hairline, brush, mirror etc.


Half Hard, Soft, Hard, Quarter Hard, Spring Hard


Sheet, Plate, Strip, Flats, Clad Plate, Coils, Foils, Plain Sheet, Flat Shim, Flat Sheet, Shim Sheet, Rolling Sheet, Rolling Plate, Rolls, Blank (Circle), soft annealed, descaled, tread plate, sheared, annealed, Checker Plate

A240 304 Stainless Application scope

System description: A240 304 stainless steel is the most widely used chromium-nickel stainless steel. As a widely used steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; it has good hot workability such as stamping and bending.
, No heat treatment hardening phenomenon (use temperature -196℃~800℃).
Corrosion resistant in the atmosphere, if it is an industrial atmosphere or heavily polluted areas, it needs to be cleaned in time to avoid corrosion.
It is suitable for food processing, storage and transportation.
Has good processing properties and weldability.
Plate heat exchangers, bellows, household products (category 1, 2 tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), auto parts (windshield wipers, mufflers, molded products), medical appliances, building materials, chemicals, food industry
, Agriculture, ship parts, etc.
304 stainless steel is a nationally recognized food grade stainless steel.

A 240 Gr 304 Mechanical Properties


ASME SA240 304 Mechanical Strength




Hardness, max

ASME SA240 304

Min Mpa


Min  %


Rockwell B












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A 240 Gr 304 Chemical Composition

Plate Grade

The Element Maximum (%)








ASME SA240 304






















For a240 304 stainless steel, the Ni element in its composition is very important, which directly determines the corrosion resistance and of 304 stainless steel.

The most important elements in 304 are Ni and Cr, but they are not limited to these two elements.
Specific requirements are stipulated by product standards.
The common judgment in the industry is that as long as the Ni content is greater than 8% and the Cr content is greater than 18%, it can be considered as 304 stainless steel.
This is why the industry calls this type of stainless steel 18/8 stainless steel.
In fact, the relevant product standards have very clear regulations on 304, and these product standards have some differences for different shapes of stainless steel.
Below are some common product standards and tests.


ASTM A240 Equivalent AISI 304 stainless steel sheet

a 240 gr

JIS G4304




EN 10095



a 240 gr 201








a 240 gr 202







a 240 gr 301








a 240 gr 304








a 240 gr 304L








a 240 gr 304N








a 240 gr XM21







a 240 gr 304LN








A240 304 stainless steel plate property requirement.

Tensile strength σb (MPa)≥515-1035

Conditional yield strength σ0.2 (MPa)≥205

Elongation δ5 (%)≥40

Reduction of area ψ (%)≥?

Hardness: ≤201HBW; ≤92HRB; ≤210HV

Density (20℃, g/cm³): 7.93

Melting point (℃): 1398~1454

Specific heat capacity (0~100℃, KJ·kg-1K-1): 0.50


ASTM / AISI/ SAE, DIN, Werkstoff grades or equivalents:


BS 970 1991



A240 SS 304L




A240 SS 304




A240 SS 316L




A240 SS 316L




A240 SS 316




A240 SS 316





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06cr19ni10 and SUS304 are the common marking methods on the market, among which 06cr19ni10 generally refers to national standard production, 304 generally refers to ASTM standard production, and SUS 304 refers to Japanese standard production.
304 is a kind of universal stainless steel, which is widely used to make equipment and parts with good comprehensive performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and more than 8% nickel. The stainless steel is produced according to ASTM 304.

jindal 304 steel

Product standard a240 304 stainless steel:For a240 304 stainless steel, the Ni element in its composition is very important, which directly determines the corrosion resistance of 304 stainless steel and its value.The most important elements in 304 are Ni and Cr, but they are not limited to these two elements. Specific requirements are specified by product standards. It is considered that 304 stainless steel can be considered as long as Ni content is more than 8% and Cr content is more than 18%. This is why the industry will call this kind of stainless steel 18 / 8 stainless steel. In fact, the relevant product standards have very clear provisions for 304, and these product standards have some differences for different shapes of stainless steel. Here are some common product standards and tests.

304 stainless steel flat bar

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ss railing 304

There are a number of households of stainless steels with totally different bodily properties. The magnetic properties of stainless steel are very dependent on the weather added into the alloy. A fundamental chrome steel has a ‘ferritic’ structure and is magnetic, fashioned from the addition of chromium – it can be hardened via the addition of carbon, making it ‘martensitic’. However, the most typical stainless steels are ‘austenitic’ – these have a better chromium content material and nickel can be added. It is the nickel which modifies the bodily structure of the metal and makes it theoretically non-magnetic. After a 500 ton press squeezes the nickel it modifications the distribution of the nickel. The same is true the place the die cuts the stainless growing the chance that rust will eventually happen there.

type 304 stainless steel magnetic properties

At cryogenic temperatures the tensile strengths of austenitic stainless steels are substantially larger than at ambient temperatures. All stainless steels are iron-primarily based alloys that comprise a minimal of round 10.5% Chromium.

Non steel additions usually embrace natural components such as Carbon and Nitrogen as well as Silicon. The S304 we use to make our stainless casters has eight.07% nickel and 18.23% chromium . This offers duplex stainless steels microstructures that embody each austenitic and ferritic phases. These alloys are so named as a result of their respective compositions – 23% chromium, 4% nickel and 22% chromium, 5% nickel.

  • The reversion course of has been utilized industrially in a really restricted extent, however apparently, it could provide a feasible processing route for strengthened austenitic stainless steels.
  • Moreover, formability, weldability and corrosion resistant aspects are mentioned and finally the benefit of refined grain structure for medical purposes is said.
  • Strength properties of annealed austenitic stainless steels are comparatively low and subsequently enhancements are desired for constructional functions.
  • Research has been performed throughout thirty years in many research teams so that the features of the reversion course of and enhanced properties are reported in quite a few papers.
  • The change of mechanical properties similar to yield power and supreme tensile strength are additionally analyzed in terms of deformation-induced martensitic transformation.

For occasion, the impact of initial grain size is found to be complicated, particularly in the ultrafine grained regime. Furthermore, it seems that there is a crucial grain measurement for changing the pattern of α′-martensite formation. Decreasing the deformation temperature motivates the formation of α′-martensite, but there is a important temperature for reaching the utmost tensile ductility. Accordingly, this overview presents the opportunities that the pressure-induced martensitic transformation can provide for controlling the microstructure and mechanical properties of metastable austenitic stainless steels. The evolution of the magnetic part upon aging at 300–520 °C in a closely chilly-drawn AISI 316L austenitic stainless-steel was studied using thermomagnetic evaluation and magnetic drive microscopy with a heating stage. An increasing development of magnetization from 50 °C to around 470 °C in the heating curves of TMA in austenitic stainless steels after a chilly-drawing process was observed. No vital Ms temperature signal in the TMA curve at cooling indicated an increase in magnetization upon cooling period without important part transformation.

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the 304 stainless steel tube has a thickness of 10 mm

In order to determine whether a material is 304 stainless steel, it must meet the requirements of each element in the product standard. As long as one does not meet the requirements, it cannot be called 304 stainless steel. Gangsteel produce A240 304 Stainless steel plate, if you have requirement for stainless steel plate, please feel free to contact us by

type 304 stainless steel magnetic properties
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