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Materials

304 Stainless Steel

304 Stainless Steel
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Overview

304 stainless steel is the most used grade worldwide. Its austenitic composition provides excellent corrosion resistance, strength and formability. Known as an 18/8 chromium-nickel stainless steel, it has become the benchmark material for countless industries.

Kormax supplies grade 304 stainless steel in a wide range of profiles, including round bar, sheet and custom-cut material. With fast turnaround, batch certifications and technical support, we help engineers achieve dependable results in demanding projects.

304 stainless steel suppliers recommend this grade where safety, hygiene and durability cannot be compromised. Typical applications include:

Common Applications

Food processing equipment
Kitchen benches, sinks and utensils
Water and wastewater treatment systems
Architectural and structural components
Storage tanks, piping and valves
Heat exchangers and pressure vessels

Key Features

Excellent general corrosion resistance, including in mildly acidic and oxidising environments
High toughness even at cryogenic temperatures
Non-magnetic in annealed condition (slightly magnetic when cold worked)
Excellent fabrication, welding and polishing characteristics
Hygienic and easy to clean for sanitary environments

Sizes & Availability

Kormax stocks stainless steel 304 round bars in a wide range of diameters. Standard lengths are available for supply, with custom sizes and grades available upon request.

Profile
Size Range
Metric Size Range (mm)
NZ (Availability)
Manufacturing Method
Solid Round Bar
See Size Range
2.50 to 304.80 (OD)
Stocked
Drawn
Square Bar
See Size Range
12.70 to 40.00 (T)
Stocked
Drawn / HRAP
Diameter (mm)
Inventory ID
Weight (Kg/MTR)
Tolerance Class
Length (m)
2.50
SS304L-2.50MM
0.04
H9
3
3.00
SS304L-3.00MM
0.06
H9
3
3.18
SS304L-3.18MM
0.06
H9
3
4.00
SS304L-4.00MM
0.1
H9
3
4.76
SS304L-4.76MM
0.14
H9
3
5.00
SS304L-5.00MM
0.16
H9
3
6.00
SS304L-6.00MM
0.23
H9
3
6.35
SS304L-6.35MM
0.25
H9
3
7.94
SS304L-7.94MM
0.39
H9
3
8.00
SS304L-8.00MM
0.41
H9
3
9.53
SS304L-9.53MM
0.57
H9
3
10.00
SS304L-10.00MM
0.62
H9
3
12.00
SS304L-12.00MM
0.91
H9
3
12.70
SS304L-12.70MM
1
H9
3
14.20
SS304L-14.20MM
1.25
H9
3
15.88
SS304L-15.88MM
1.57
H9
3
16.00
SS304L-16.00MM
1.61
H9
3
19.05
SS304L-19.05MM
2.26
H9
3
20.00
SS304L-20.00MM
2.5
H9
3
22.23
SS304L-22.23MM
3.07
H9
3
25.00
SS304L-25.00MM
3.89
H9
3
25.40
SS304L-25.40MM
4.01
H9
3
28.58
SS304L-28.58MM
5.08
H9
3
30.00
SS304L-30.00MM
5.60
H9
3
31.75
SS304L-31.75MM
6.27
H9
3
35.00
SS304L-35.00MM
7.62
H9
3
38.10
SS304L-38.10MM
9.03
H9
3
40.00
SS304L-40.00MM
9.95
H9
3
41.27
SS304L-41.27MM
10.59
H9
3
44.45
SS304L-44.45MM
12.29
H9
3
45.00
SS304L-45.00MM
12.6
H9
3
50.00
SS304L-50.00MM
15.55
H9
3
50.80
SS304L-50.80MM
16.05
H9
3
57.15
SS304L-57.15MM
20.32
H9
3
60.00
SS304L-60.00MM
22.39
H9
3
63.50
SS304L-63.50MM
25.08
H9
3
65.00
SS304L-65.0MM
26.28
H9
3
69.85
SS304L-69.85MM
30.35
H9
3
76.20
SS304L-76.20MM
36.12
H9
3
80.00
SS304L-80.00MM
39.81
H9
3
82.55
SS304L-82.55MM
42.39
H9
3
88.90
SS304L-88.9MM
49.16
H9
3
101.60
SS304L-101.60MM
64.21
H11
3
114.30
SS304L-114.3MM
81.27
H11
3
120.00
SS304L-120.00MM
89.57
H11
3
127.00
SS304L-127MM
100.33
H11
3
133.35
SS304L-133.35MM
110.61
H11
3
139.70
SS304L-139.70MM
121.40
H11
3
152.40
SS304L-152.40MM
144.47
H11
3
165.10
SS304L-165.10MM
169.56
H11
3
177.80
SS304L-177.80MM
196.64
H11
3
180.00
SS304L-180.00MM
201.54
H11
3
190.50
SS304L-190.50MM
225.74
H11
3
203.20
SS304L-203.20MM
256.84
H11
3
215.90
SS304L-215.90MM
289.95
H11
3
228.60
SS304L-228.60MM
325.07
H11
3
241.30
SS304L-241.30MM
362.19
H11
3
254.00
SS304L-254.00MM
401.32
H11
3
279.40
SS304L-279.40MM
485.59
H11
3
304.80
SS304L-304.80MM
577.89
H11
3
W x T (mm)
W x T (inch)
Kg/MTR
50 X 6
-
0.81
50 X 10
-
1.35
50 X 12
-
1.62
50 X 20
-
2.70
50.8 X 25.4
2 X 1
3.49
60 X 10
-
1.62
63.5 X 25.4
2-1/2 X 1
4.36
63.5 X 31.75
2-1/2 X 1-1/4
5.45
76 X 15
-
3.08
76.2 X 12.7
3 X 1/2
2.62
76.2 X 25.4
3 X 1
5.23
76.2 X 31.75
3 X 1-1/4
6.54
76.2 X 38.1
3 X 1-1/2
7.84
76.2 X 50.8
3 X 2
10.46
76.2 X 63.5
3 X 2-1/2
13.07
80 X 6
1.30
80 X 20
4.32
100 X 6
-
1.62
100 X 10
-
2.70
100 X 12
-
3.24
100 X 20
-
5.40
100 X 25
-
6.75
100 X 60
-
16.20
100.3 X 16
-
4.34
101.6 X 32
-
8.78
101.6 X 40
-
10.98
101.6 X 50.8
4 X 2
13.94
101.6 X 76.2
4 X 3
20.91
127 X 76.2
5 X 3
26.13
127 X 101.6
5 X 4
34.84
130 X 65
-
22.82
150 X 10
-
4.05
150 X 12
-
4.86
150 X 25
-
10.13
152.4 X 31.75
6 X 1-1/4
13.07
152.4 X 50.8
6 X 2
20.91
152.4 X 76.2
6 X 3
31.36
152.4 X 101.6
6 X 4
41.81
160 X 45
-
19.44
170 X 32
-
14.69
200 X 12
-
6.48
200 X 40
-
21.60
200 X 55
-
29.70
203.2 X 101.6
8 X 4
55.75
215 X 76.2
-
44.24
230 X 65
-
40.37
230 X 112
-
69.56
232 X 42
-
26.31
235 X 152
-
96.45
240 X 90
-
58.32
254 X 12.7
10 X 1/2
8.71
254 X 50.8
10 X 2
34.84
300 X 36
-
29.16
304 X 50
-
41.04
304.8 X 101.6
12 X 4
83.62
305 X 6
-
4.94
305 X 8
-
6.59
305 X 14
-
11.53
305 X 16
-
13.18
305 X 18
-
14.83
320 X 20
-
17.28
330 X 70
-
62.37
350 X 22.5
-
21.27
351 X 30.5
-
28.91
380 X 10
-
10.26
425 X 25
-
28.69
T x W (mm)
T x W (inch)
Kg/MTR
6 X 50
-
0.81
6 X 80
-
1.30
6 X 100
-
1.62
6 X 305
-
4.94
8 X 305
-
6.59
10 X 50
-
1.35
10 X 60
-
1.62
10 X 100
-
2.70
10 X 150
-
4.05
10 X 380
-
10.26
12 X 50
-
1.62
12 X 100
-
3.24
12 X 150
-
4.86
12 X 200
-
6.48
12.7 X 76.2
1/2 X 3
2.62
12.7 X 254
1/2 X 10
8.71
14 X 305
-
11.53
15 X 76
-
3.08
16 X 100.3
-
4.34
16 X 305
-
13.18
18 X 305
-
14.83
20 X 50
-
2.70
20 X 80
-
4.32
20 X 100
-
5.40
20 X 320
-
17.28
22.5 X 350
-
21.27
25 X 100
-
6.75
25 X 150
-
10.13
25 X 425
-
28.69
25.4 X 50.8
1 X 2
3.49
25.4 X 63.5
1 X 2-1/2
4.36
25.4 X 76.2
1 X 3
5.23
30.5 X 351
-
28.91
31.75 X 152.4
1-1/4 X 6
13.07
31.75 X 63.5
1-1/4 X 2-1/2
5.45
31.75 X 76.2
1-1/4 X 3
6.54
32 X 101.6
-
8.78
32 X 170
-
14.69
36 X 300
-
29.16
38.1 X 76.2
1-1/2 X 3
7.84
40 X 101.6
-
10.98
40 X 200
-
21.60
42 X 232
-
26.31
45 X 160
-
19.44
50 X 304
-
41.04
50.8 X 76.2
2 X 3
10.46
50.8 X 101.6
2 X 4
13.94
50.8 X 152.4
2 X 6
20.91
50.8 X 254
2 X 10
34.84
55 X 200
-
29.70
60 X 100
-
16.20
63.5 X 76.2
2-1/2 X 3
13.07
65 X 130
-
22.82
65 X 230
-
40.37
70 X 330
-
62.37
76.2 X 101.6
3 X 4
20.91
76.2 X 127
3 X 5
26.13
76.2 X 152.4
3 X 6
31.36
76.2 X 215
-
44.24
90 X 240
-
58.32
101.6 X 127
4 X 5
34.84
101.6 X 152.4
4 X 6
41.81
101.6 X 203.2
4 X 8
55.75
101.6 X 304.8
4 X 12
83.62
112 X 230
-
69.56
152 X 235
-
96.45
Inventory ID
T x W (mm)
T x W (inch)
Kg/MTR
SS304SQ-12.7MM
12.70 X 12.70
½ X ½
1.28
SS304SQ-19.05MM
19.05 X 19.05
¾ X ¾
2.87
SS304SQ-31.75MM
31.75 X 31.75
1 ¼ X 1 ¼
7.98
SS304SQ-40.00MMHRAP
40.00 X 40.00
-
12.67

*Swipe left to view more information on the table

Chemical Composition

The chemical balance of grade 304 stainless steel explains its durability. The chromium and nickel mix ensures corrosion resistance and dependable performance.

(Typical Composition %)

Element Symbol Value
Carbon C ≤0.08
Silicon Si ≤1.0
Manganese Mn ≤2.0
Phosphorus P ≤0.045
Sulfur S ≤0.03
Chromium Cr 18–20
Nickel Ni 8–10.5
Nitrogen N ≤0.10

Mechanical Properties

The mechanical properties of 304 stainless steel make it suitable for tanks, pressure vessels and structural work.

Property Value
Tensile Strength ≥ 515 MPa (typ. 540–750 MPa)
Yield Strength ~205 MPa (0.2% offset)
Elongation ≥ 40% (A50mm)
Hardness ≤ 201 HB

Comparative Specifications

UNS S30400

SAE 304

ASTM 304

JIS SUS304

DIN 1.4301

ISO 15510 X5CrNi18-10

EN X5CrNi18-10

GB 06Cr19Ni10

Machining Allowances and Tolerances

Kormax supplies 304 stainless steel to precise dimensional tolerances, ensuring reliability in engineering applications. All material conforms to ASTM A276 / A479 and meets ISO dimensional standards, aligning with our broader engineered materials solutions.

Diameter (mm) Range Tolerance Class Tolerance (mm)
Up to 19.05 H9 +0 / -0.036
20 and above H11 +0 / -0.090 to -0.18 depending on size

Conforms to ASTM A276 / A479 and dimensional tolerances as per ISO standards.

Explore More Stainless Steel Grades

Looking for an alternative? Explore our broader range of stainless steel materials, including:

316 Stainless Steel

304L Stainless Steel

Duplex Stainless Steel A182 F53

Kormax is your reliable stainless steel supplier, helping engineers source the right materials for lasting performance.

Resources

Data Sheet

Stainless Steel 304

PDF (165 KB)

https://www.kormax.com/wp-content/uploads/2026/07/Stainless-Steel-304-Data-Sheet.pdf

Blog

A Guide to the Grades of Aluminium: Choosing the Right Alloy

Resource

Engineering Metal Bar Manufacturing Methods

PDF (298 KB)

Metal Castings & Engineering Materials pdf cover preview

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Kormax is ISO certified for ISO 9001, ISO 14001, and ISO 45001.

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Why Choose Kormax for 304 Stainless Steel

As a fourth-generation family-owned business, Kormax brings over 75 years of foundry and engineering metals experience to your project.

We operate in various sectors worldwide, utilising our leading engineering, manufacturing and global distribution capabilities to offer world-class solutions for engineers.

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Unique range of quality products, in industry-specific profiles and sizes, including casting alloys.

Top-tier Foundries

Global top-tier supply network with the ability to source specific sizes and metals through trusted stainless steel supplier partnerships.

Supply Security

For anyone working with critical materials like 304 stainless steel, we offer custom supply options to enhance continuity.

Quality Management

With ISO 9001, ISO 14001 and ISO 45001 certification, our quality systems include complete batch traceability across all stainless steel grades.

Competitive Pricing

With a wide supplier network, Kormax can balance quality and value, supporting long-term partnerships with 304 stainless steel suppliers worldwide.

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