What is a equivalent material to 1.4550 stainless steel?
Jul 01, 2025
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1.4550 is a stainless steel grade defined under the EN/DIN standard, also known by its designation X6CrNiNb18-10. It is a niobium-stabilized austenitic stainless steel, comparable to AISI 347. The addition of niobium (Nb) improves intergranular corrosion resistance, especially in welded conditions, making it highly suitable for pressure vessels and high-temperature applications.
What is a equivalent material to 1.4550 stainless steel?
| Standard System | Equivalent Grade |
|---|---|
| ASTM / AISI | 347 / 347H |
| UNS | S34700 / S34709 |
| JIS (Japan) | SUS347 / SUS347H |
| ISO / AFNOR | X6CrNiNb18-10 |
What is the standard for 1.4550 stainless steel?
| Grade : | X6CrNiNb18-10 | ||||||
| Number: | 1.4550 | ||||||
| Classification: | Austenitic stainless steel - special grade | ||||||
| Density: | 7.9 g/cm ³ | ||||||
| Standard: |
|
Chemical Composition of EN 1.4550 Stainless Steel
| Element | Content (% by weight) |
|---|---|
| C | ≤ 0.08 |
| Si | ≤ 1.00 |
| Mn | ≤ 2.00 |
| P | ≤ 0.045 |
| S | ≤ 0.015 |
| Cr | 17.0 – 19.0 |
| Ni | 9.0 – 12.0 |
| Nb (or Nb + Ta) | ≥ 10 × C (min), typically 0.3 – 1.0% |
EN 1.4550 Stainless Steel Mechanical Properties (Annealed Condition, Room Temperature)
| Property | Value (Typical or Min.) |
|---|---|
| Tensile Strength (Rm) | 500 – 750 MPa |
| Yield Strength (Rp0.2) | ≥ 190 MPa |
| Elongation (A5) | ≥ 40% |
| Hardness (HBW) | ≤ 215 |
| Modulus of Elasticity | ~200 GPa |
| Density | ~7.90 g/cm³ |
| Operating Temp. Range | Up to 850°C (continuous) |
key advantages of 1.4550 stainless steel
Corrosion Resistance
When properly heat-treated, the atmospheric corrosion resistance is good.
It has good corrosion resistance in weak organic acid environments, detergents, and alkaline solutions. However, it is highly sensitive to chlorides in oxidizing environments.
High-Temperature Performance
It can be used continuously up to 800°C and intermittently up to 850°C.
It has adequate scale formation resistance.
It also has good corrosion resistance against sulfur-containing gases in coal and oil-fired furnaces.
Weldability
Weldability is moderate, and post-weld annealing is recommended.
Applications
It is used in the automotive industry for body parts, bumpers,
all kitchen equipment, and cutlery production,
as well as in the food and chemical industries and interior design.
Why Choose Gnee for 1.4550 Stainless Steel?
Gnee supplies high-quality 1.4550 stainless steel sheets, pipes, bars, and custom fabricated parts, with:
Full MTC / EN 10204 3.1 certification
Fast delivery for pressure vessel and high-temp clients
In-house machining, welding, and surface treatment
Export-ready packaging and third-party inspection
Besides, we also offer 1.4550 Stainless Steel Polished Pipe, 1.4550 stainless steel solution annealed pipe, 1.4550 Stainless steel Bright annealed pipe, 1.4550 Stainless steel pickling pipe, 1.4550 Mirror Polished steel pipe.
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