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304h Stainless Steel Sheet & Plate

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304H Stainless Steel Sheet & Plate (UNS S30409,1.4301)

304H stainless steel, designated as UNS S30409 and EN 1.4948, is a high-carbon version of the popular 304 stainless steel. It is specifically designed for use in applications where elevated temperatures and mechanical stress are present.

 

304H stainless steel sheet and plate are widely used in industries such as power generation, petrochemical processing, and heat exchangers. Common applications include boiler and superheater tubes, pressure vessels, and furnace parts, where strength and durability under thermal stress are critical.

 

Key Features

  • High-Temperature Strength: The increased carbon content improves creep resistance and strength at temperatures up to 800°C (1472°F), making it ideal for heat-intensive environments.
  • Corrosion Resistance: 304H maintains good resistance to oxidation and corrosion in a variety of environments, including mildly acidic and oxidizing conditions.
  • Durability: It combines strength with excellent ductility, ensuring reliability in demanding applications.

 

Technical Specifications:

  • UNS Number: S30409
  • DIN/EN Designation: 1.4948

Available Thickness

3/16″
1/4″
5/16″
3/8″
7/16″
1/2″
9/16″
5/8″
3/4″
7/8″
1″
1 1/8″
4.8mm
6.3mm
7.9mm
9.5mm
11.1mm
12.7mm
14.3mm
15.9mm
19mm
22.2mm
25.4mm
28.6mm
1 1/4″
1 3/8″
1 1/2″
1 5/8″
1 3/4″
2″
2 1/4″
2 1/2″
2 3/4″
3″
3 1/4″
3 1/2″
31.8mm
34.9mm
38.1mm
41.3mm
44.5mm
50.8mm
57.2mm
63.5mm
69.9mm
76.2mm
82.6mm
88.9mm
3 3/4″
4″
4 1/4″
4 1/2″
4 3/4″
5″
5 1/4″
5 1/2″
5 3/4″
6″
95.3mm
101.6mm
108mm
114.3mm
120.7mm
127mm
133.4mm
139.7mm
146.1mm
152.4mm
304h-stainless-steel-sheet-plate

Application

  • Automotive
  • Chemical and Pharmaceutical
  • Fertilizer
  • Food Processing and Handling
  • Manufacturing
  • Mining
  • Oil & Gas
  • Phosphate Mining

Standard

  • ASTM A240 / A240M
  • ASTM A276 / A276M
  • ASTM A312 / A312M
  • ISO 15510
  • EN 10088-2
  • IN 10204
  • HE G4304
  • HE G4305
  • ASME SA240 / SA240M
  • ASME SA312 / SA312M

Worldwide equivalents of grade 304H

(USA: AISI, ASTM, UNS)

Country
Standard
Grade
USA 
ASTM
304H
USA 
AISI
304H
Germany
DIN
X5CrNi18-10
Europe
EN
1.4948
UK
BS
304S31
Japan
JIS
SUS 304H
Russia
Gost
08Cr18Ni10
ISO
International
1.4301 / 1.4306

Corrosion Resistance

  1. General Corrosion: 304H, like standard 304, has good resistance to a wide range of corrosive environments. It resists oxidation and corrosion in environments like air, fresh water, and some chemicals.
  2. High-Temperature Corrosion: 304H has better resistance to high-temperature oxidation compared to standard 304 stainless steel. It can withstand higher temperatures while maintaining its structural integrity.
  3. Intergranular Corrosion: 304H is less prone to intergranular corrosion than some other stainless steels, especially when used in the annealed condition. However, it’s still advisable to avoid conditions that lead to chromium carbide precipitation, which can occur in the temperature range of 425–870°C (800–1590°F).
  4. Pitting and Crevice Corrosion: 304H provides decent resistance to pitting and crevice corrosion. However, in highly chlorinated environments or where there’s a high risk of localized corrosion, more resistant alloys (such as 316H) might be preferable.
  5. Stress Corrosion Cracking: 304H generally exhibits good resistance to stress corrosion cracking in most environments. However, exposure to chlorides or high-temperature environments may increase susceptibility, so care should be taken with those conditions.

Chemical Composition of Stainless Steel 304H

Element
Typical Composition (wt%)
Carbon (C)
0.04 – 0.10
Chromium (Cr)
18.00 – 20.00
Nickel (Ni)
8.00 – 12.00
Manganese (Mn)
2.00 (max)
Silicon (Si)
1.00 (max)
Phosphorus (P)
0.045 (max)
Sulfur (S)
0.030 (max)
Nitrogen (N)
0.10 – 0.16
Iron (Fe)
Balance

Physical Properties of Stainless Steel 304H

Property
Value
Density
8.00 g/cm³ (8000 kg/m³)
Melting Point
1400-1450°C (2552-2642°F)
Specific Heat Capacity
500 J/kg·K
Thermal Conductivity
16.2 W/m·K
Electrical Resistivity
72 × 10⁻⁹ Ω·m
Modulus of Elasticity
193-200 GPa (28-29 × 10⁶ psi)
Poisson’s Ratio
0.27-0.30
Thermal Expansion
16.0 × 10⁻⁶ /K (at 20-100°C)
Yield Strength
205 MPa (30 ksi)
Tensile Strength
515 MPa (75 ksi)
Elongation
40% (minimum)
Hardness (Rockwell B)
85-95 RB

Mechanical Properties of Stainless Steel 304H

Property
Value
Tensile Strength
515 MPa (75 ksi)
Yield Strength
205 MPa (30 ksi)
Elongation
40% (minimum)
Reduction of Area
60% (minimum)
Hardness (Rockwell B)
85-95 RB
Modulus of Elasticity
193-200 GPa (28-29 × 10⁶ psi)
Poisson’s Ratio
0.27-0.30
Shear Modulus
77-82 GPa (11-12 × 10⁶ psi)

Fabrication Data

  • Welding: Stainless steel 304H can be welded using standard methods such as TIG (Tungsten Inert Gas) or MIG (Metal Inert Gas) welding. It is often recommended to use fillers that are compatible with 304H, like 308H or 309H, to maintain joint integrity.

  • Machining: Stainless steel 304H can be machined using conventional methods. Tools should be sharp and made from materials suitable for stainless steel to ensure a smooth finish and reduce work-hardening.

  • Forming: Hot forming is generally performed at temperatures between 1040 – 1170°C (1900 – 2150°F). Cold forming is also possible but requires more force and may require intermediate annealing.

  • Heat Treatment: Heat treatment is typically used to relieve stresses. Annealing should be done at high temperatures, followed by a controlled cooling process to achieve the desired mechanical properties and avoid sensitization.

  • Corrosion Resistance: 304H offers good resistance to oxidation and general corrosion but may require additional protection or alloying in more aggressive environments.

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