1.4948 Stainless Steel Chemical Composition and Applications
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What is 1.4948 stainless steel?
1.4948 stainless steel (also known as 304H) is a high-carbon austenitic stainless steel, equivalent to ASTM 304H, containing higher levels of chromium (18-20%), nickel (8-10.5%), and carbon (0.04-0.10%). It can be processed into various practical product forms, including plates, coils, tubes, bars, and wires. It is widely used in high-temperature and high-pressure environments such as power plants, boilers, heat exchangers, and pressure vessels, and exhibits good formability, weldability, and corrosion resistance under specific conditions.
What is the chemical composition of 1.4948?
The chemical composition of 1.4948 stainless steel is as follows: carbon content 0.04% to 0.08%, chromium content 17.0% to 19.0%, nickel content 8.0% to 11.0%, manganese content ≤2.0%, silicon content ≤1.0%, phosphorus content ≤0.04%, sulfur content ≤0.02%, and nitrogen content ≤0.10%. The remaining component is iron.
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.12–0.18 |
| Chromium (Cr) | 9.5–11.5 |
| Nickel (Ni) | 0.5–1.0 |
| Molybdenum (Mo) | 0.9–1.2 |
| Vanadium (V) | 0.05–0.15 |
| Tungsten (W) | 0.2–0.4 |
| Niobium (Nb) | 0.05–0.15 |
| Manganese (Mn) | ≤ 0.5 |
1.4948 Mechanical Properties (Typical)
| Property | 1.4948 Stainless Steel |
|---|---|
| Tensile Strength | 850–1100 MPa |
| Yield Strength | 450–700 MPa |
| Elongation | 10–18% |
| Hardness | 240–300 HB |
| Density | 7.7 g/cm³ |
| Operating Temperature | Up to 600°C (intermittent use) |
What is the operating temperature range for 1.4948 stainless steel?
1.4948 stainless steel (also known as 304H) is designed for high-temperature applications, offering higher creep strength in the temperature range of approximately 800°C to 870°C (1500°F - 1600°F), making it ideal for pressure vessels, boilers, and heat exchangers. However, if high resistance to aqueous corrosion is required, prolonged use in the temperature range of 425°C to 860°C should be avoided.
What are the main applications of 1.4948 stainless steel?
1.4948 stainless steel (ASTM 304H) is primarily used in high-temperature, high-stress environments like boilers, pressure vessels, heat exchangers, and power generation piping, offering excellent strength, oxidation resistance, and corrosion resistance, making it ideal for the chemical, petrochemical, and nuclear industries for components like pipes, valves, and fittings.
What are the differences between 1.4948 stainless steel and 17-4PH or 1.4542?
1.4948 (304H) is a standard austenitic stainless steel, while 17-4PH (1.4542/1.4548) is a precipitation-hardening (PH) martensitic stainless steel. 17-4PH has good corrosion resistance (similar to 304 under certain conditions, but susceptible to corrosion in high-temperature chloride environments), while 1.4948 (304H) offers excellent corrosion resistance, good ductility, and weldability, but its strength is significantly lower than 17-4PH. 304H is suitable for high-temperature environments, while the strength of 17-4PH decreases significantly at high temperatures.
GNEE is a comprehensive enterprise specializing in the wholesale of stainless steel raw materials, integrating trade, processing, warehousing, and transportation. We primarily deal in 304 stainless steel, 304L stainless steel, 316L stainless steel, and other stainless steel plates, coils, strips, and flat bars. We maintain a large inventory of over 1000 tons of materials with a wide range of specifications and ample supply. We also provide various stainless steel processing services according to customer requirements, including leveling, slitting, drawing, mirror polishing, oil grinding, polishing, stamping, bending, straightening, cutting, rolling, and punching.Email: info@gneestainless.com
The 304/304L/304H stainless steel sheets are carefully packaged in wooden crates and boxes to ensure safe transportation. All sheets undergo rigorous testing and quality inspection and are supplied with test certificates to guarantee quality.
