TYPE 304 STAINLESS PLATE

TYPE 304 STAINLESS PLATE

TYPE 304 STAINLESS PLATE Type 304 is: Austenitic. Type 304 is the most versatile and frequently used chromium nickel stainless steel. It is an all-purpose alloy with a multitude of benefits. It has good corrosion and oxidation resistance, performs well in terms of formability and weldability and...
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TYPE 304 STAINLESS PLATE

Type 304 is:

  • Austenitic. Type 304 is the most versatile and frequently used chromium nickel stainless steel. It is an all-purpose alloy with a multitude of benefits. It has good corrosion and oxidation resistance, performs well in terms of formability and weldability and is easy to clean. Because this material offers a superb combination of high strength and light weight, about half of the stainless produced in the United States is type 304.


  • Used in a variety of applications: Some of the typical uses of grade 304 include appliances, cladding, consumer and industrial products, flanges and valves, handrails, hardware and fasteners, HVAC, kitchen, food and beverage equipment, medical equipment, oil and gas parts, pipes and tubes, plumbing supplies, storage tanks and window frames.


  • Able to be processed in many ways: Metal processors and fabricators stamp, form, draw, bend, cut and weld alloy 304 to produce various parts. Cold working will increase strength and hardness.


  • Available in many variants: Different levels of carbon and nickel primarily define the different variants of this alloy. Type 304L is a lower carbon variant to type 304 that offers excellent welding characteristics. Type 304H is the higher carbon variant to type 304 and is generally specified when increased mechanical properties are desired. Type 304 is also available with increased levels of nickel, which makes the alloy softer and easier to form often times beneficial for deep drawn processes. Each variant may offer benefits or drawbacks depending on the specific application.


Application

 Saucepans

 Springs, screws, nuts & bolts

 Sinks & splash backs

 Architectural panelling

 Tubing

 Brewery, food, dairy and pharmaceutical production equipment

 Sanitary ware and troughs

 

Supplied Forms

Sheet

Strip

Bar

Plate

Pipe

Tube

Coil

Fittings


The Chemical Composition and Mechanical Properties of the most common variants of Type 304 are as follows:


Type 304Type 304LType 304H
ASTM A240/A240M (UNS Designation)

S30400

S30403

S30409

Chemical Composition

Chromium

17.5-19.5%

17.5-19.5%

18.0-20.0%

Nickel

8.0-10.5%

8.0-12.0%

8.0-10.5%

Carbon (max.)

0.070%

0.030%

.040-.100%

Manganese (max.)

2.000%

2.000%

2.000%

Silicon (max.)

0.750%

0.750%

0.750%

Sulfur (max.)

0.030%

0.030%

0.030%

Phosphorus (max.)

0.045%

0.045%

0.045%

Nitrogen (max.)

0.100%

0.100%


Mechanical Properties (annealed)

Tensile (min. psi)

75,000

70,000

75,000

Yield (min. psi)

30,000

25,000

30,000

Elongation (in 2″, min %)

40

40

40

Hardness (max Rb)

92

92

92


304, type 304 and grade 304 are interchangeable terms for 304 stainless steel.

304L, type 304L and grade 304L are interchangeable terms for 304L stainless steel.

304H, type 304H and grade 304H are interchangeable terms for 304H stainless steel.


Possible alternative grades to 304 grade stainless steel

Grade

Why it might be chosen instead of 304

301L

A higher work hardening rate grade is required for certain roll formed or stretch formed components.

302HQ

Lower work hardening rate is needed for cold forging of screws, bolts and rivets.

303

Higher machinability needed, and the lower corrosion resistance, formability and weldability are acceptable.

316

Higher resistance to pitting and crevice corrosion is required, in chloride environments

321

Better resistance to temperatures of around 600-900 °C is needed…321 has higher hot strength.

3CR12

A lower cost is required, and the reduced corrosion resistance and resulting discolouration are acceptable.

430

A lower cost is required, and the reduced corrosion resistance and fabrication characteristics are acceptable.


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