X6CrMoS17 (1.4105) Ferritic Stainless Steel
X6CrMoS17 (1.4105) Ferritic Stainless Steel - EN 10088-1
Detailed technical data for X6CrMoS17 (1.4105) ferritic stainless steel: chemical composition, mechanical properties, physical properties, and international equivalents per EN 10088.
Machining, blanking, bending, light forming; not recommended for welding
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X6CrMoS17 Ferritic Stainless Steel Introduction
X6CrMoS17, designated 1.4105 under EN 10088-1, is a ferritic chromium stainless steel containing molybdenum and controlled sulfur additions. The sulfur enhances machinability, making this grade suitable for high‑speed automatic machining while retaining good corrosion resistance in mildly aggressive environments. The molybdenum addition slightly improves pitting resistance compared to standard 17% Cr ferritic steels. Typically supplied in the annealed condition as plate or coil, the alloy offers a combination of moderate strength, excellent machinability, and adequate formability. It is not recommended for welding due to risk of grain growth and embrittlement, and its corrosion resistance is lower than that of austenitic grades. Common applications include turned parts, fasteners, valve components and pump shafts.
X6CrMoS17 Ferritic Stainless Steel Chemical Composition
Chemical composition according to EN 10088-1 for grade X6CrMoS17 (1.4105). All values are in weight percent. The intentional sulfur addition (0.15–0.35%) ensures excellent machinability. Nickel content is restricted to maintain a fully ferritic structure.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | Maximum |
| Silicon (Si) | ≤ 1.00 | Maximum |
| Manganese (Mn) | ≤ 1.50 | Maximum |
| Phosphorus (P) | ≤ 0.040 | Maximum |
| Sulfur (S) | 0.15 – 0.35 | Intentional addition for machinability |
| Chromium (Cr) | 16.0 – 18.0 | Ferrite stabilizer |
| Molybdenum (Mo) | 0.20 – 0.60 | Improves pitting resistance |
| Nickel (Ni) | ≤ 1.00 | Maximum; kept low to avoid austenite |
X6CrMoS17 Ferritic Stainless Steel Thermal and Electrical Physical Properties
Typical physical properties for X6CrMoS17 (1.4105) ferritic stainless steel at room temperature unless otherwise noted. These values are representative and may show minor variations depending on exact processing. Data compiled from recognised stainless steel handbooks.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.7 | g/cm³ | 20 °C |
| Modulus of elasticity (E) | 200 | GPa | 20 °C; tension |
| Shear modulus (G) | 77 | GPa | 20 °C |
| Poisson's ratio (ν) | 0.28 | – | 20 °C; within elastic range |
| Thermal expansion coefficient (α) | 10.5 × 10⁻⁶ | K⁻¹ | 20–100 °C |
| Thermal conductivity (λ) | 25 | W/(m·K) | 20 °C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρe) | 0.60 | μΩ·m | 20 °C |
X6CrMoS17 Ferritic Stainless Steel Mechanical Properties
Mechanical properties at room temperature in the annealed condition as per EN 10088-2 for plate, sheet and coil. The values are valid for thicknesses up to 75 mm. Elongation is reported on two gauge lengths according to thickness. Bending test is mandatory for thickness ≤ 10 mm.
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (Rp0.2) | ≥ 250 | MPa | Annealed; thickness ≤ 75 mm |
| Tensile strength (Rm) | 430 – 630 | MPa | Annealed; thickness ≤ 75 mm |
| Elongation (A80) | ≥ 18 | % | Annealed; thickness 0.5 mm to < 3 mm |
| Elongation (A) | ≥ 20 | % | Annealed; thickness 3 mm – 75 mm (L0 = 5.65√S0) |
| Bending test | No cracks | – | Bending angle 180°; mandrel diameter = 2 × thickness; applicable up to 10 mm |
X6CrMoS17 Ferritic Stainless Steel Full Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10088-1 | X6CrMoS17 (1.4105) | Base grade |
| USA | ASTM A240/A240M | UNS S43020 (430F) | Identical chemical and mechanical property requirements |
| Japan | JIS G4304 | SUS430F | Matching composition and machinability |
| International | ISO 15510 | X6CrMoS17 | Equivalent to EN grade |
| China | GB/T 1220 | Y10Cr17 | Very close match; slightly higher carbon limit (≤0.12) |
X6CrMoS17 Ferritic Stainless Steel Application Introduction
X6CrMoS17 (1.4105) is specifically designed for components that require high production rates via automatic machining. The controlled sulfur addition forms manganese sulfides that act as chip breakers, reducing tool wear and improving surface finish. Typical uses span the automotive, electrical, and industrial sectors. Because of its stable ferritic structure, the alloy is magnetic and has low thermal expansion, making it suitable for parts that must maintain dimensional stability during temperature cycling.
Product Applications: Pump shafts, Valve spindles and bodies, Solenoid cores and armatures, Precision-turned fasteners (bolts, nuts, screws), Bushings and bearings
Processed into products: Precision shafts with tight tolerances, Threaded rods and studs, Small gears and pinions, Nozzles and metering parts, Camshaft components
Application industries: Automotive manufacturing, Electrical appliances and electronics, Mechanical engineering, General industrial machinery, Fastener production
X6CrMoS17 Ferritic Stainless Steel Similar or Comparable Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10088-1 | X6Cr17 (1.4016) | Standard ferritic 17% Cr steel; no Mo or S; lower machinability, similar corrosion resistance |
| Europe | EN 10088-1 | X12CrS13 (1.4005) | Martensitic free-cutting steel; lower Cr, higher C; magnetic and hardenable but less corrosion resistant |
| Europe | EN 10088-1 | X14CrMoS17 (1.4104) | Higher carbon ferritic grade with Mo and S; slightly higher strength after heat treatment; poorer weldability |
| USA | ASTM A240 | 430 | Plain 17% Cr ferritic; slightly better corrosion resistance but inferior machinability |
Notes:
Machining: Excellent machinability due to sulfide inclusions; use cemented carbide tools at moderate speeds. Welding: Not recommended because of risk of grain coarsening, embrittlement, and reduced corrosion resistance. If welding is unavoidable, use low heat input and post‑weld annealing. Corrosion: Suitable for mild atmospheric, fresh water, and mildly acidic environments. Not intended for chloride‑rich or marine environments. Heat treatment: Typically annealed at 780–850 °C followed by rapid cooling; cannot be hardened by heat treatment.
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