304 Stainless Steel

Type 304 stainless is perhaps the most commonly referenced stainless steel.

It is a general purpose stainless steel grade with a wide range of applications in construction and engineering.

It is an alloy of 18% Chromium, 8% Nickel, austenitic stainless steel. Sometimes written as 18/8.

Grade 304 Stainless Steel references
304 1.4301 Type 304 UNS S30400
304 L 1.4307 Type 304L UNS S30403

Widely available as:

  • Sheet – 0.5mm-3mm thick
  • Plate – 3mm-15mm thick
  • Heavy plate – 20mm and above
  • Tube, pipe, castings
  • hot rolled angle
  • hot rolled channel section.
Hot Rolled 304 Stainless Steel Angles
3mm 20 x 20 25 x 25 30 x 30 40 x 40 50 x 50        
5mm 25 x 25 30 x 30 40 x 40 50 x 50 60 x 60        
6mm 25 x 25 30 x 30 40 x 40 50 x 50 60 x 60 70 x 70 75 x 75 80 x 80 100 x100
10mm       50 x 50 60 x 60 70 x 70   80 x 80 100 x 100

All other angle sizes can be sheared from plate and cold formed by CNC pressbrake.

Cold Formed 304 Stainless Steel Angles
3mm 30 x 30 mm Up to 300 x 300 mm 3000mm long
4mm 40 x 40 mm Up to 300 x 300 mm 3000mm long
5mm 50 x 50 mm Up to 300 x 300 mm 3000mm long
6mm 60 x 60 mm Up to 300 x 300 mm 3000mm long
8mm 75 x 75 mm Up to 300 x 300 mm 3000mm long
10mm 90 x 90 mm Up to 300 x 300 mm 3000mm long
12mm 120 x 120 mm Up to 300 x 300 mm 2500mm long
15mm 150 x 150 mm Up to 300 x 300 mm 1500mm long

Other combinations of unequal leg lengths are also possible, see Cold Forming

Irregular shaped pieces and curved shapes can be cut by plasma, laser or waterjet. The cutting process selection depends on the thickness of the material and the quality and profile of the finished cut edge. See Plasma Cutting

Holes can be drilled or milled. See Holes & Slots

Slotted holes can be punched or milled. See Holes & Slots

304 stainless can be welded with MMA, MIG or TIG welding. Grade 304L for welding. 304L has a lower carbon content, which prevents precipitation of complex Cr Carbides at the grain boundaries in the heat affected zone (sensitisation). The majority of plate and sections are currently double certified as 304/304L, but check. For more about welding

There are a range of surface finishes available for stainless steel see polishing

Typical Mechanical Properties

(Note - these are indicative guideline values- not to be used for design – check with appropriate standard)

Typical 304 Stainless Steel Mechanical Properties
0.2% proof stress N/mm2 200-230
UTS N/mm2 520-720
Elongation % 40
Density g/cm3 8

See BS EN ISO 10088-2



Need Holes or Slots?

We punch holes or slots in stainless steel or mild steel plates. The Punched Holes diameter must be greater than the plate thickness. Holes less than the plate thickness must be drilled - please contact the Sales Desk for a price
Holes or slots in Stainless or Mild Steel to your specification

How Accurate?

Download our Cutting & Bending tolerance specifications PDF
Accuracy Tolerances and Specifications

How Soon?

Delivery and manufacturing lead times. Depending upon the size of the order we aim to despatch goods within 2-5 working days. Carriage cost depends upon the size and weight of the order, and the delivery address postcode.
Delivery and manufacturing lead times