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Stainless Steel 304

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Steel is an alloy, plays a crucial role in modern industry as it forms the literal backbone of various applications. Comprising mainly of carbon and iron, steel incorporates trace elements that contribute to its distinct properties. Among these is a group called stainless steels, which utilize chromium to combat corrosion commonly faced by iron-based materials. This informative piece focuses on the widely used SS grade 304 steel, exploring its physical, mechanical, and practical characteristics. By delving into its attributes, designers can gain a comprehensive understanding of SS 304 capabilities, applications, and potential suitability for their own projects.

Grade 304 stainless steel stands as the prevailing choice due to its numerous advantages. This austenitic alloy exhibits remarkable resistance to corrosion, along with exceptional strength, toughness, and weldability. In cases involving thicker sections requiring complete ss 304 corrosion resistance, the low carbon variant, 304L, becomes necessary. Additionally, the 304H version contains a guaranteed minimum carbon content, ensuring optimum strength even at elevated temperatures.

The composition of grade 304 stainless steel includes 18% chromium, imparting its resistance to various corrosive environments. Moreover, the presence of 8% nickel contributes to its austenitic structure. This structure grants grade 304 outstanding formability and fabrication characteristics, ensuring its versatility in different applications.

Due to its corrosion resistance, grade 304 SS finds extensive use where long-lasting appearance and service life are crucial. Its hygienic surface and ease of cleaning further enhance its suitability for diverse purposes. For sections thicker than approximately 6mm requiring complete corrosion resistance, the low carbon variant, 304L stainless steel, becomes indispensable. Similarly, applications involving elevated temperature service, such as pressure vessels, may necessitate the use of the high-carbon 304H stainless steel.

Grade 304 stainless steel, ss304, aisi 304 stainless steel, sus 304 stainless steel, steel 304 presents a compelling choice in various industries. Its corrosion resistance, formability, and maintenance attributes make it a durable and reliable option for applications that demand long-lasting performance.

Stainless Steel 304 Flanges

Stainless Steel 304 Flanges

Stainless Steel 304 Rod/Bar

Stainless Steel 304 Rod/Bar

Stainless Steel 304 Hex Bars

Stainless Steel 304 Hex Bar

Stainless Steel 304 Square Bar

Stainless Steel 304 Square Bar

Stainless Steel 304 Seamless Pipes

Stainless Steel 304 Seamless Pipes

Stainless Steel 304 Welded Pipes

Stainless Steel 304 Welded Pipes

Stainless Steel 304 Plates/Sheet

Stainless Steel 304 Plates/Sheet

Stainless Steel 304 Seamless Tubes

Stainless Steel 304 Seamless Tubes

Stainless Steel 304 Flat Bar

Stainless Steel 304 Flat Bar

Stainless Steel 304 Angles

Stainless Steel 304 Angle

Stainless Steel 304 Channels

Stainless Steel 304 Channel

Stainless Steel 304 H Beam

Stainless Steel 304 H Beam

Stainless Steel 304 I Beam

Stainless Steel 304 I Beam

Stainless Steel 304 Welded Tubes,

Stainless Steel 304 Welded Tubes

Stainless steel 304 fittings

Stainless steel 304 Fittings

Stainless Steel 304 Perforated Sheets

Stainless Steel 304 Perforated Sheets

Stainless Steel 304 Single Slotted Pipe

Stainless Steel 304 Single Slotted Pipe

Stainless Steel 304 Double Slotted Pipe

Stainless Steel 304 Double Slotted Pipe

Stainless Steel 304 Components

Stainless Steel 304 Components

Stainless Steel 304 Tube

Stainless Steel 304 Tube

Stainless Steel 304 Pipe

Stainless Steel 304 Pipe

304 Stainless Steel Chemical Composition

Table 1. Chemical composition for 304 stainless steel alloys

% 304 304L 304H
C 0.0 – 0.07 0.0 – 0.03 0.04 – 0.08
Mn 0.0 – 2.0 0.0 – 2.00 0.0 – 2.0
Si 0.0 – 1.00 0.0 – 1.00 0.0 – 1.0
P 0.0 – 0.05 0.0 – 0.05 0.0 – 0.04
S 0.0 – 0.03 0.0 – 0.02 0.0 – 0.02
Cr 17.50 – 19.50 17.50 – 19.50 17.00 – 19.00
Ni 8.00 – 10.50 8.00 – 10.50 8.00 – 11.00
Fe Balance Balance Balance
N 0.0-0.11 0.0-0.11 0.0 – 0.10

304 Stainless Steel Properties

Mechanical Properties of Stainless Steel 304

Table 2a. Mechanical properties for 304 SS alloys – sheet up to 8 mm thick

Grade 304 304L 304H
Tensile Strength (MPa) 540 – 750 520 – 700
Proof Stress (MPa) 230 Min 220 Min
Elongation A50 mm 45 Min % 45 Min %

Table 2b. Mechanical properties for 304 stainless steel alloys – plate from 8 – 75 mm thick

Grade 304 304L 304H
Tensile Strength (MPa) 520 – 720 500 – 700
Proof Stress (MPa) 210 Min 200 Min
Elongation A5 45 Min % 45 Min %

Table 2c. Mechanical properties for 304 stainless steel alloys – bar and section up to 160 mm diameter / thickness

Grade 304 304L 304H
Tensile Strength (MPa) 500 – 700 500 – 700 500 – 700
Proof Stress (MPa) 190 175 Min 185 Min
Elongation A50 mm 45 Min % 45 Min % 40 Min %
Hardness Brinell 215 Max HB 215 Max HB

Physical Properties of Stainless Steel 304

Table 3. Physical properties for 304 UNS-S30400 alloys

Property Value
Density 8.00 g/cm3
Melting Point 1450 °C
Modulus of Elasticity 193 GPa
Electrical Resistivity 0.72 x 10-6 Ω.m
Thermal Conductivity 16.2 W/m.K
Thermal Expansion 17.2 x 10-6/K

Alloy Designations

Stainless steel 304 also corresponds to the following standard designations and specifications:

Euronorm UNS BS En Grade
1.4301 S30400

304S15

304S16

304S31

58E 304
1.4306 S30403 304S11 304L
1.4307 304S11 304L
1.4311 304S11 304L
1.4948 S30409 304S51 304H
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