Stainless steel 304h plate manufacturer supplier. Contact us to get free quote and sample!
Stainless steel 304H is a high carbon version of 304 austenitic stainless steel (H stands for High Carbon). Its core difference is that the carbon content is strictly controlled within the range of 0.04%-0.10% (the upper limit of ordinary 304 is usually 0.08%, and the upper limit of low carbon 304L is 0.03%). HT PIPE is a SS304h Plate supplier with 15+ export experience. Contact us for more information and quotes for free!
ss 304h steel plate Features
s304h sheet Creep resistance
This is the core value of 304H. In the typical high temperature service range of 550°C to 800°C, its ability to resist slow and continuous deformation far exceeds that of 304/L. For example, at 650°C/100MPa stress, the creep rupture life of 304H can be several times or even an order of magnitude higher than that of 304.
s30409 steel High temperature yield/tensile strength
In a continuously heated environment, 304H has a high temperature short-term strength (yield strength, tensile strength) significantly better than 304/L due to the high carbon solid solution strengthening effect.
Composition 304 grade stainless steel
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 304H | min. max. |
0.04 0.10 |
- 2.0 |
- 0.75 |
-0.045 | - 0.030 |
18.0 20.0 |
- | 8.0 10.5 |
- |
304H Stainless Steel Plate Physical properties
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) | |||
| 0-1000C | 0-3150C | 0-5380C | at 1000C | at 5000C | |||||
| 304/L/H | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
s304H Stainless Steel sheet Cornerstone of stability
Organization stability: In long-term service at high temperature, 304H has better resistance to the precipitation of harmful phases (such as σ phase), reduces the risk of embrittlement, and extends the safe life of equipment.
Antioxidation: Inheriting the excellent antioxidant ability of the 304 series, it can form a stable chromium oxide protective layer in high-temperature air or combustion product environment, effectively resisting continuous oxidation corrosion.
UNS 30409 Basic performance inheritance
corrosion resistance: Reliable performance in general atmosphere, fresh water, and a variety of mild chemical media, equivalent to 304, better than ordinary carbon steel.
hot and cold processing: Austenite structure gives it good ductility and toughness, which is convenient for stamping, bending, deep drawing and other forming processes (but high carbon has a slight effect on extreme deep drawing).
astm ss304h Weldability
Sensitization risk: The heat-affected zone of welding is prone to precipitate chromium carbide in the sensitization range of 425-850°C, resulting in intergranular corrosion tendency. Solution treatment (rapid cooling) is required after welding to dissolve carbides.
Hot cracking tendency: Slightly higher than 304L, heat input and interlayer temperature need to be strictly controlled.
Recommended welding materials: Usually Nb-stabilized welding materials (such as 347 type) or ultra-low carbon welding materials (such as 308L) are selected to improve the resistance to intergranular corrosion.
