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 Rod/Bar
Stainless Steel 304 Hex Bar
Stainless Steel 304 Square Bar
Stainless Steel 304 Seamless Pipes
Stainless Steel 304 Welded Pipes
Stainless Steel 304 Plates/Sheet
Stainless Steel 304 Seamless Tubes
Stainless Steel 304 Flat Bar
Stainless Steel 304 Angle
Stainless Steel 304 Channel
Stainless Steel 304 H Beam
Stainless Steel 304 I Beam
Stainless Steel 304 Welded Tubes
Stainless steel 304 Fittings
Stainless Steel 304 Perforated Sheets
Stainless Steel 304 Single Slotted Pipe
Stainless Steel 304 Double Slotted Pipe
Stainless Steel 304 Components
Stainless Steel 304 Tube
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 |
Supplied Forms
Stainless steel 304 is typically supplied by Lakshya Steel in a range of finishes in the following forms:
