X6CrNiNb18-10 material chemical composition
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What material is X6CrNiNb18-10?
X6CrNiNb18-10 (material number 1.4550) is an austenitic stainless steel produced in Germany, conforming to international standards including DIN 17440, EN 10250-4, and ISO 15510. It possesses corrosion resistance, intergranular corrosion resistance, and high-temperature oxidation resistance, making it suitable for high-temperature environments of 600℃-700℃. 1.4550 stainless steel can be strengthened by cold working and exhibits excellent processing and welding properties. Product forms include round bars, plates, and tubes.
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USA - |
France AFNOR |
England BS |
Sweden SS |
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Chemical composition % of steel X6CrNiNb18-10 (1.4550): EN 10088-2-2005
| Nb = 10 * C to 1.0 Elements not listed in this table shall not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. |
| C | Si | Mn | Ni | P | S | Cr | Nb |
| max 0.08 | max 1 | max 2 | 9 - 12 | max 0.045 | max 0.015 | 17 - 19 | max 1 |
Mechanical properties of steel X6CrNiNb18-10 (1.4550)
| Rm - Tensile strength (MPa) (+A) | 500-740 |
| Rm - Tensile strength (MPa) (+AT) | 510-740 |
| Rp0.2 0.2% proof strength (MPa) (+AT) | 205 |
| Rp0.2 0.2% proof strength (MPa) (+A) | 200-240 |
| KV - Impact energy (J) transverse, (+A) | +20° 60 |
-196° 40 |
| KV - Impact energy (J) longitud., (+A) | +20° 100 |
| A - Min. elongation at fracture (%) (+A) | 30-40 |
| A - Min. elongation at fracture (%) longitud., (+AT) | 35 |
| Brinell hardness (HB): (+A) | 230 |
| Brinell hardness (HB): (+AT) | 210 |
Is X6CrNiNb18-10 stainless steel magnetic?
X6CrNiNb18-10 stainless steel is an austenitic grade, so it is generally non-magnetic in the annealed condition due to its face-centered cubic (FCC) crystal structure. However, slight magnetism may appear after cold working, such as bending, deep drawing, or machining, because deformation can induce a small amount of martensite. Even then, its magnetic permeability remains low (typically μr < 1.02), far below that of ferritic or martensitic stainless steels.
What is the density of X6CrNiNb18-10 stainless steel?
The density of X6CrNiNb18-10 stainless steel is typically 7.90 g/cm³ (or 7,900 kg/m³), consistent with standard austenitic stainless steels in the 18Cr-10Ni family. This density value is essential for weight calculations in applications such as pressure vessels, heat exchanger tubing, piping systems, and structural components.
What is the yield strength of X6CrNiNb18-10 stainless steel?
The yield strength (0.2% proof stress) of X6CrNiNb18-10 stainless steel is typically 205–230 MPa in the annealed condition, depending on product form and thickness. This grade maintains stable mechanical properties even at high temperatures, and at elevated service temperatures (600–800°C), its yield strength generally decreases but still performs better than non-stabilized grades like 304 due to niobium stabilization that improves creep resistance.
What are the typical applications of X6CrNiNb18-10 in chemical, petrochemical, and heat-resistant systems?
X6CrNiNb18-10 stainless steel (AISI 347 / 1.4550) is commonly used in the chemical industry for reactors, storage tanks, piping systems, and heat exchangers that handle acids, alkalis, and other corrosive media. In petrochemical plants, it is used for furnace tubes, superheater components, and process piping, where operating temperatures can exceed 800°C and thermal cycling frequently occurs.
GNEE Stainless Steel is an independent stockist and processor of 347/347H stainless steel. With extensive inventory and superior processing capabilities, we can meet the needs of most projects, whether for stock products or custom orders. We offer: stock size plates and sheets, stock length round bars, custom-cut plates and sheets, custom-cut round bars, cold forming of plates, sheets, and round bars, and any other necessary processing services. For any inquiries, please Email: info@gneestainless.com
