When it comes to fastening two or more objects, quality fasteners are crucial to ensure the longevity of your project. One of the most popular materials for fasteners is stainless steel 304. But what exactly is stainless steel 304, and why is it so commonly used in fasteners? In this blog post, we’ll dive into the composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance of 304 stainless steel fasteners, giving you all the information you need to make informed choices.
What are 304 Stainless Steel Fasteners?
SS 304 Fasteners are high-strength, corrosion-resistant fasteners made from grade 304 stainless steel alloy. They have excellent strength, durability and resistance to acids and can be used in various applications that require a strong material. Due to their rust resistance, they’re ideal for use in outdoor environments or areas of extreme temperatures and humidity.
SS 304 Fasteners Composition
SS 304 Bolts is a type of austenitic stainless steel composed of 18% chromium and 8% nickel. It also contains small amounts of other elements, such as carbon and manganese. This composition gives the steel a high level of corrosion resistance and makes it suitable for use in various environments, including humid, acidic, or alkaline environments.
|
Grade
|
C
|
Mn
|
Si
|
P
|
S
|
Cr
|
Mo
|
Ni
|
N
|
|
|
Stainless Steel 304
|
min.
max.
|
–
0.08
|
–
2.0
|
–
0.75
|
–
0.045
|
–
0.030
|
18.0
20.0
|
–
|
8.0
10.5
|
–
0.10
|
|
Stainless Steel 304L
|
min.
max.
|
–
0.030
|
–
2.0
|
–
0.75
|
–
0.045
|
–
0.030
|
18.0
20.0
|
–
|
8.0
12.0
|
–
0.10
|
|
Stainless Steel 304H
|
min.
max.
|
0.04
0.10
|
–
2.0
|
–
0.75
|
–
0.045
|
–
0.030
|
18.0
20.0
|
–
|
8.0
10.5
|
–
|
Stainless Steel 304 Fasteners Physical Properties
The physical properties of Types 304 SS Fasteners include a density of 8.03 g/cm3, a melting point of 1400-1450°C, and a boiling point of 2500-2600°C. Additionally, stainless steel 304 is non-magnetic, making it perfect for applications where this property is desired.
|
Grade
|
Density (kg/m3)
|
Elastic Modulus (GPa)
|
Mean Coefficient of Thermal Expansion (m/m/°C)
|
Thermal Conductivity (W/m.K)
|
Specific Heat 0-100°C (J/kg.K)
|
Electrical Resistivity(n.m)
|
|||
|---|---|---|---|---|---|---|---|---|---|
|
0-100°C
|
0-315°C
|
0-538°C
|
at 100°C
|
at 500°C
|
|||||
|
Stainless Steel 304/L/H
|
8000
|
193
|
17.2
|
17.8
|
18.4
|
16.2
|
21.5
|
500
|
720
|
SS304 Fasteners Mechanical Properties
304 SS Bolts have a tensile strength of 550 MPa and a yield strength of 240 MPa. This strength and its corrosion resistance make stainless steel 304 ideal for applications where the fastener will be exposed to high-stress or corrosive environments.
|
Grade
|
Tensile Strength (MPa) min
|
Yield Strength 0.2% Proof (MPa) min
|
Elongation (% in 50mm) min
|
Hardness
|
|
|
Rockwell B (HR B) max
|
Brine-ll (HB) max
|
||||
|
Stainless Steel 304
|
515
|
205
|
40
|
92
|
201
|
|
Stainless Steel 304L
|
485
|
170
|
40
|
92
|
201
|
|
Stainless Steel 304H
|
515
|
205
|
40
|
92
|
201
|
Stainless Steel 304 Fasteners Equivalent
|
AISI Grade Equivalent
|
JIS Equivalent
|
Stainless Steel Notation
|
EN/DIN Numerical Equivalent
|
UNS
designation |
EN/DIN Symbolical Equivalent
|
|
AISI 304
|
SUS304
|
SS 304
|
EN 1.4301
|
UNS S30400
|
X4CrNi18-10
|
|
AISI 304L
|
SUS304L
|
SS 304L
|
EN 1.4307
|
UNS S30403
|
X2CrNi18-9
|
|
AISI 304H
|
SUS304H
|
SS 304H
|
EN 1.4948
|
UNS S30409
|
X2CrNiN18-10
|
Stainless Steel 304 Fasteners Uses:
SS 304 hex bolt are used in various industries, including construction, automotive, marine, and food processing. Examples of applications include fastening structures, piping systems, and machinery. UNS S30400 Fasteners is also widely used in household items, such as kitchen appliances, due to its high resistance to rust and corrosion.
SS 304 Bolts Heat Treatment
Unlike many other materials, UNS S30400 Bolts does not require heat treatment to achieve its mechanical properties. However, annealing at 1010-1120°C can reduce the risk of distortion during machining and welding. Additionally, quenching and tempering can increase the hardness and strength of the material.
UNS S30400 Fasteners Corrosion Resistance
One of the most significant advantages of 304 stainless steel bolts is their high corrosion resistance. The 18% chromium content in the steel creates a passive film on the surface, preventing further oxidation. This resistance means that stainless steel 304 is ideal for harsh environments, including marine and chemical applications.
Conclusion:
UNS S30400 fasteners are an excellent choice for anyone looking for high-quality, long-lasting fastening solutions. The composition of 18% chromium and 8% nickel provides an excellent combination of strength, corrosion resistance, and aesthetic appearance. These fasteners are versatile, used in various industries and applications, and their superior properties make them an ideal choice for many projects. With its high corrosion resistance and mechanical durability, it’s clear that stainless steel 304 is an excellent choice for fasteners.
Abhishek is a seasoned blogger and industry expert, sharing his insights and knowledge on various topics. With his research, Abhishek offers valuable insights and tips for professionals and enthusiasts. Follow him for expert advice on the latest trends and developments in the metal industry.
