Stainless steel is one of the industry’s most versatile and widely used materials today. With several grades of stainless steel available, choosing the right one for your particular application can be challenging. This blog post will explore everything you need about Stainless Steel Grade 19-9 DL – its composition, properties, heat treatment, and applications.
Stainless Steel Grade 19-9 DL Composition
Stainless Steel Grade 19-9 DL is a precipitation-hardening, nickel-chromium alloy with high strength and corrosion resistance. It contains about 19% chromium, 9% nickel, and 0.15% carbon, which makes it resistant to most forms of corrosion and oxidation at elevated temperatures. The alloy also contains small amounts of manganese, silicon, sulfur, phosphorus, and nitrogen.
| Element | Content (%) |
|---|---|
| Chromium, Cr | 18 – 20 |
| Nickel, Ni | 8-11 |
| Manganese, Mn | 1.5 – 0.75 |
| Molybdenum, Mo | 1 – 1.75 |
| Tungsten | 1 – 1.75 |
| Silicon, Si | 0.3 – 0.8 |
| Carbon, C | 0.28 – 0.55 |
| Niobium (Nb) + Tantalum (Ta) | 0.25 – 0.6 |
| Titanium, Ti | 0.5 max |
| Iron, Fe | Balance |
Stainless Steel Grade 19-9 DL Physical Properties
Stainless Steel Grade 19-9 DL has a density of 8.02 g/cm3 and a melting point of 1399-1430°C. It has good ductility and excellent strength, which heat treatment can further increase. The alloy also exhibits good toughness and high-temperature resistance and is non-magnetic.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.02 g/cm3 | 0.29 lb/in3 |
Stainless Steel Grade 19-9 DL Mechanical Properties
Stainless Steel Grade 19-9 DL can be precipitation-hardened, increasing strength. The alloy offers a good combination of tensile, yield, and hardness properties. The specific tensile strength ranges from 1300-1900 MPa, the yield strength varies from 1140-1870 MPa, and the hardness is up to HRC 45.
Stainless Steel Grade 19-9 DL Equivalents
| ASTM A477 (651) | ASTM A458 (651) | ASTM A457 (651) | ASTM A453 (651) | AMS 5579 |
| AMS 5526 | AISI 651 |
Stainless Steel Grade 19-9 DL Uses
Stainless Steel Grade 19-9 DL has wide applications in the aerospace, defence, and oil and gas industry. It is commonly used for components and parts that require high strength, corrosion resistance, and toughness at elevated temperatures. Hence it is used in aircraft engine parts, nuclear reactor components, and oil drilling rigs. It can be used as tubes, bars, sheets, and wire.
Stainless Steel Grade 19-9 DL Hardness
Stainless Steel Grade 19-9 DL can achieve high hardness levels through heat treatment. The alloy can undergo solution annealing, followed by ageing, which develops the precipitation-hardened microstructure and increases strength and hardness. The alloy’s hardness can be further improved by cold working.
Stainless Steel Grade 19-9 DL Heat Treatment
Stainless Steel Grade 19-9 DL can be heat-treated through solution annealing and ageing. Solution annealing involves heating the alloy to 1050-1080°C, followed by rapid cooling. This process removes the strain hardening and gives the alloy a uniform grain structure. Ageing is carried out at 470-620°C to promote the formation of precipitates that contribute to the strengthening of the alloy.
Conclusion
Stainless Steel Grade 19-9 DL is a high-strength, corrosion-resistant alloy used in various industries. Its unique mechanical and physical properties make it ideal for high-temperature applications. The alloy can be precipitation-hardened through heat treatment, which improves its strength and hardness. Its vast and diverse applications from aircraft engine components to oil drilling rigs. Understanding the composition, properties, and heat treatment of Stainless Steel Grade 19-9 DL can help you decide when selecting a stainless steel grade for your application.
Sakshee is a talented blogger, with a particular focus on the Business and Metal Industry. She is passionate about sharing her insights on various metal products and helping professionals to make a better decisions.
