ASTM A240 Type 304H Mirror Plates

Gangsteel produce and export ASTM A240 304H stainless steel , ASTM A240 TP304H Stainless Steel No.1 Finish Plate and we supply TP304H stainless steel stock list thickness 2mm to 300mm at Origin China. We are the large stainless material factory in China.

To relieve stress during severe forming or spinning welding could also be followed by annealing. 304 and 304L usually has the -grade certification, particularly sheet, tubing, and spherical bar. All the chemical contents and mechanical properties meet the standard specification of 304 and 304L. But the double-grade licensed product is probably not accepted in excessive temperature software. The collection have good performance in numerous environments of environment or corrosive mediums.

However, steady use at °C is not recommended if corrosion resistance in water is required. In this instance 304L is recommended because of its resistance to carbide precipitation. 304 has wonderful corrosion resistance in a wide variety of environments and when involved with completely different corrosive media. Pitting and crevice corrosion can happen in environments containing chlorides. A summary sheet comparing key traits of generally used stainless-steel alloys. Marlin Steel is a leading producer of customized‐engineered merchandise from steel wire and sheet metallic. Its industrial materials handling containers serve many industries including aerospace, defense, medical and .

304h stainless steel


304H stainless steel belt, SUS304H stainless steel belt, 304H stainless steel belt, 0Cr18Ni9, 304-general model; namely 18/8 stainless steel. The GB grade is 0Cr18Ni9.
Vickers hardness (HV) 370°-420° and Hardness tolerance (HV) ±20°

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a240 Type 304H widely used material.
Corrosion resistance, heat resistance, good mechanical properties, good processing performance at room temperature such as deep drawing, bending, etc., will not harden after heat treatment, can withstand general rust in the building, and can resist erosion by food processing media (but contains concentrated acid
Corrosion may occur due to high temperature and chloride components), and it can resist organic compounds, dyes and a wide variety of inorganic compounds.
ASTM A240 Stainless Steel 304H Chemical Composition



ASTM A240 Chemical Composition












Austenitic Steels










A240 Type 304L (low carbon), good resistance to nitric acid, and durable for medium temperature and concentration of sulfuric acid, widely used as liquid gas storage tanks, low temperature equipment (304N), appliances and other consumer products, kitchen equipment, hospital equipment, transportation Tools, wastewater treatment equipment.

Alloy 304 (S30400), 304L (S30403), and 304H (S30409) stainless steels are 18% chromium, 8% nickel austenitic alloys, which are the most common and commonly used alloys in the stainless steel family. Because these alloys have one or more of the following properties, they can be used in various applications.
Properties include:
STM A240 TP304H Stainless Steel Plate Physical Properties


Density (kg/m3)

Elastic Modulus (GPa)

Mean Coefficient of Thermal Expansion (m/m/0C)

Thermal Conductivity (W/m.K)

Specific Heat 0-1000C (J/kg.K)

Electrical Resistivity (n.m)




at 1000C

at 5000C












A high-alloy steel A240 304h that can resist corrosion in the air or in chemically corrosive media. It has a beautiful surface and good corrosion resistance. It does not need to undergo surface treatment such as plating, but exerts its inherent surface properties. It is used in various steels.
One kind, usually called stainless steel.
High alloy steels such as 13 chromium steel and 18-chromium nickel steel are representative of performance.
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From a metallographic point of view, because stainless steel contains chromium, a very thin chromium film is formed on the surface. This film isolates the intruding oxygen from the steel for corrosion resistance.

In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 12% chromium
SS 304H Plate Equivalent grades









SS 304H



304, 304L, and 304H alloys are the most prone to stress corrosion cracking (SSC) among austenitic stainless steels because of their relatively low nickel content.
The conditions that cause stress corrosion cracking are: (1) the presence of halide ions (usually chloride), (2) residual tension, and (3) the temperature exceeds 120°F (49°C).
Cold deformation during alloy forming, stenting into tube sheet, welding operations, etc. can all cause stress.
Annealing and stress relief heat treatment after cold deformation can reduce stress, thus reducing the possibility of halide stress corrosion cracking.
In the environment that may cause intergranular corrosion, it is best to choose low-carbon 304L alloy when working under low-temperature annealing.


AASTM A240 Stainless Steel 304H Plate Mechanical Properties


Mechanical Properties for Stainless Steel Plates, Stainless Steel Sheet



Tensile Properties


Yield Strength (Mpa)

Tensile Strength (Mpa)

Elongation (%)










ASTM A240 TP304H Steel Plate

These sheets and plates have been praised nicely for its outshining welding properties. It is probably the most versatile and low-temperature skills among many different grades. It may be effortlessly hardened even when it is treated with cold working. Also, it’s rich in chromium parts and that is the root of its wonderful anti-rusting qualities.

ASTM A240 TP304H Stainless Steel Clad Plate

Which gate is better iron or steel?

While steel can resist corrosion better than iron does, you may still need to replace steel fencing more often than you would iron gates. On the other hand, the most obvious advantage a wrought iron gate would have over a steel fence is durability.

304L stainless-steel is proof against carbide precipitation, which might be utilized to this range of temperature. H in 304H refers to excessive A240 SS304H Stainless factory temperature, excessive carbon content is the guarantee of excessive temperature energy.

This distinction of 0.05% carbon content material produces a slight, but marked, distinction in the performances of the two alloys. The existence of those chrome steel variants may cause some confusion—particularly when the names & formulations of two chrome steel alloys are almost the same. Alloy 304/304H additionally resists reasonably aggressive organic acids such as acetic. The nickel current in the alloy offers resistance to reasonably lowering options similar to pure phosphoric acid, whatever the focus, in cold solutions and as much as 10% diluted sizzling options. The alloy also can operate efficiently in caustic solutions free of chlorides or fluorides at reasonable temperatures. Alloy 304/304H has good resistance to atmospheric corrosion, foods and beverages and to many and inorganic chemical substances in reasonably oxidizing to reasonably reducing environments.

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Reducing the carbon and including titanium can achieve the same impact, but including titanium which is 321 stainless has higher smelting prices, the worth is more expensive. In reality, in accordance with the content of chromium and nickel ,they’re all 304 stainless-steel, the composition is containing 18% chromium , 8% nickel , however the principle difference is the proportion of carbon between them. What’s the distinction between grade 304 and grade 304L stainless-steel? About 0.05% carbon content material a tiny difference that may have a giant effect.

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Cold working operations will improve the energy and hardness of the alloy and may leave it slightly magnetic. Alloy 304/304H performs nicely in fresh water service with low ranges of chlorides . At greater chloride levels the grade is susceptible to crevice corrosion and pitting. For profitable efficiency under these extra severe conditions, higher molybdenum content is want similar to 316/316L.

Is there lead in stainless steel?

First, there is no lead used to make stainless steel. Stainless steel does contain other toxic metals (see Q&A: Stainless Steel Leaching into Food and Beverages), but it does not contain lead.

These things have chemical and mechanical properties complying with each 304H and 304L specs. Such double confirmed merchandise might be unsuitable for prime temperature purposes. This gives it larger energy at high temperature however does make it more vulnerable to carbide precipitation when welding. Grade 304 is an austenitic metal with excellent welding and forming characteristics. The key elements in 304 are Chromium and Nickel which give it glorious resistance to corrosion.

  • The larger the carbon content, the more serious the corrosion resistance of stainless-steel and the simpler it’s to rust.
  • The greater the carbon content material, the more serious the corrosion resistance of stainless-steel is, also easier to rust.
  • Among the three, 304H has the best carbon content material, 304L has the lowest carbon content, and 304 chrome steel carbon content material is in the middle.
  • The distinction in carbon content material also causes the price to vary, or the totally different requirements for that sentence.

Intergranular corrosion is the cracking that can happen alongside grain boundaries of steel within the presence of tensile stress. SS 304/304L/304H Sheets & Plates are extremely utilized by the paper and pulp industries, textile equipment manufacturer, condensers in fossil gasoline and nuclear fuel technology stations, and petrochemical processing tools manufacturers. The concept behind the specifications of these grade sheets and plates is ruled by the ASTM A240 and ASME SA240 requirements. It opposes amazing erosion, and, modestly oxidizing and lessening situations.

304h seamless pipes

304h stainless steel properties

The fabricated parts ought to then be quickly cooled to make sure maximum corrosion resistance. 304HN Aircraft and Aerospace components, marine parts, excessive temperature parts, pressure vessels, pump components, welded tubing, solid fittings, pipe flanges, and valves. For example, the final word tensile strength of 304L is roughly 85 ksi (~586 MPa), less than the UTS of standard grade 304 stainless, which is 90 ksi (~620 MPa). The distinction in yield energy is barely higher, with 304 SS having a 0.2% yield strength of forty two ksi (~289 MPa) and 304L having a 0.2% yield strength of 35 ksi (~241 MPa). The difference in carbon content also results in a difference in value, or in other words, completely different requirements for different uses. In truth, all three are 304 stainless steel according to chrome-nickel content material. Cold WorkingPromptly fabricated by most cold working approach, 304 could require intermediate annealing to keep away from cracking or tearing from radical deformation.

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Gangsteel mainly products are 304h Square tube,304h stainless,304h Rectangular tube,304h seamless pipes,304h seamless ,304h welded pipes,304h angle bar,304h H Beam,304h channel beam,304h round bar ,304h cutting part,304h machine part,304H CNC cutting parts,304H water jet cutting parts,304H laser cutting parts and stainless steel 304h. If you have requirement, please contact us by email

304h vs 304l