Martensit 436 (UNS S43600) Ferritic Stainless Steel Plate/Coil
Martensit 436 (UNS S43600) Ferritic Stainless Steel Plate/Coil - Technical Data & Equivalents
Detailed technical data for Martensit 436 (UNS S43600) ferritic stainless steel plate and coil according to ASTM A240. Includes chemical composition, mechanical properties, physical data, international equivalents, and application guide.
Cold forming, bending, deep drawing, welding (with appropriate filler), machining (slightly more difficult than austenitic grades), bright annealing
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Martensit 436 Ferritic Stainless Steel Plate/Coil Introduction
Martensit 436 is a proprietary designation for UNS S43600 ferritic stainless steel, typically supplied as plate and coil. This grade is stabilized with niobium and offers moderate corrosion resistance combined with good formability and weldability. It is designed to resist intergranular corrosion after welding and to withstand continuous and cyclic oxidation up to approximately 800 °C. The low nickel content provides an economic advantage over austenitic grades. Key characteristics:
- Ferritic, magnetic structure
- Excellent resistance to stress corrosion cracking
- Good deep drawability and bending properties
- Niobium stabilization prevents sensitization
- Scalable performance for automotive exhaust and heat exchange applications
Martensit 436 Ferritic Stainless Steel Plate/Coil Chemical Composition
The composition limits listed below correspond to UNS S43600 ferritic stainless steel in accordance with ASTM A240/A240M. Niobium is added as a stabilizing element; the standard requires Nb+Ta to be at least five times the carbon content, but not more than 0.80 %. Nickel is not deliberately added and appears only as a residual element.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.12 % | Max |
| Manganese (Mn) | ≤ 1.00 % | Max |
| Phosphorus (P) | ≤ 0.040 % | Max |
| Sulfur (S) | ≤ 0.030 % | Max |
| Silicon (Si) | ≤ 1.00 % | Max |
| Chromium (Cr) | 14.0 – 16.0 % | Typical range |
| Molybdenum (Mo) | 0.75 – 1.25 % | Typical range |
| Nitrogen (N) | ≤ 0.10 % | Max |
| Niobium + Tantalum (Nb+Ta) | 5 × C min, ≤ 0.80 % | Stabilization requirement |
Martensit 436 Ferritic Stainless Steel Plate/Coil Physical Properties
Physical data are typical for UNS S43600 ferritic stainless steel in the annealed condition. Values are derived from recognised literature (ASM, Outokumpu, etc.) and may vary slightly with actual product form and heat treatment. Thermal expansion and conductivity data are provided for two temperature ranges.
| Property | Typical Value | Unit | Test Conditions / Temperature Range |
|---|---|---|---|
| Density (ρ) | 7.70 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 200 | GPa | 20 °C |
| Shear Modulus (G) | 78 | GPa | 20 °C (calculated) |
| Poisson's Ratio (ν) | 0.28 | – | 20 °C |
| Thermal Expansion Coefficient (α) | 10.4 | µm/m·°C | 20 – 100 °C |
| Thermal Expansion Coefficient (α) | 11.0 | µm/m·°C | 20 – 300 °C |
| Thermal Conductivity (λ) | 25.0 | W/m·K | 100 °C |
| Thermal Conductivity (λ) | 26.5 | W/m·K | 500 °C |
| Specific Heat Capacity (cp) | 460 | J/kg·K | 20 °C |
| Electrical Resistivity (ρe) | 0.60 | µΩ·m | 20 °C |
Martensit 436 Ferritic Stainless Steel Plate/Coil Mechanical Properties
The stated mechanical properties apply to material in the annealed condition at room temperature, for thicknesses typically up to 6.35 mm (plate) and all standard sheet/coil gauges. Reported values are longitudinal test results. Hardness is not specified in the standard but is typically ≤ 95 HRB for this grade.
| Property | Standard Requirement | Unit | Test Conditions |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 415 | MPa | Room temperature, annealed |
| Yield Strength (Rp0.2) | ≥ 310 | MPa | Room temperature, annealed |
| Elongation (A) in 50 mm (2 in.) | ≥ 20 | % | Room temperature, annealed |
Martensit 436 Ferritic Stainless Steel Plate/Coil Fully Equivalent Grade Standards and Substitutable Designations
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASTM A240/A240M | UNS S43600 | Base standard; commercially also known as AISI 436 |
| Japan | JIS G4304 | SUS436L | Essentially the same chemistry; carbon is typically controlled to ≤0.025 %, still within UNS S43600 range. Widely accepted as direct equivalent. |
| International | ISO 15510 | X2CrMoTi18‑2 (approximate) | Composition close to S43600; Ti‑stabilized variant may be used for similar applications. Not a 100 % identical match due to stabilization element difference. |
Martensit 436 Ferritic Stainless Steel Plate/Coil Application Introduction
Martensit 436 ferritic stainless steel is optimised for applications requiring excellent resistance to high‑temperature oxidation, good thermal fatigue behaviour, and ease of fabrication. It is the material of choice in weight‑sensitive designs where high‑temperature strength and corrosion resistance are required without the cost of nickel‑bearing alloys. Typical thicknesses range from 0.5 mm to 6.0 mm in coil and cut‑plate form.
Product Applications: Cold‑rolled sheet for stamped exhaust parts, Hot‑rolled plate for industrial silencers and heat exchanger shells, Continuously welded tube and pipe for exhaust and process piping, Roll‑formed profiles and decorative channels
Processed into products: Automotive exhaust flanges and brackets, Deep‑drawn catalytic converter housings, Stamped burner components, Laser‑welded manifolds, Flexible coupling membranes
Application industries: Automotive – exhaust manifolds, catalytic converters, mufflers, tailpipes, turbocharger components, Heat exchangers – recuperators, charge air coolers, EGR coolers, Appliances – oven liners, dishwasher tubs, washing machine drums, Architecture – roofing, cladding, trim, sunscreens, Industrial – fume extraction ducts, chimney liners
Martensit 436 Ferritic Stainless Steel Plate/Coil Recommendations for Similar / Closely Related Alternative Materials
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASTM A240 | 439 (S43035) | Ti‑stabilized ferritic stainless steel with similar corrosion resistance but lower Mo; suitable for less demanding exhaust components. |
| USA | ASTM A240 | 444 (S44400) | Niobium‑ and titanium‑stabilized with higher Mo (1.75–2.50 %) for superior pitting resistance; an upgrade for more aggressive environments. |
| Europe | EN 10088‑2 | 1.4526 (X2CrMoTi18‑2) | Ti‑stabilized equivalent to UNS S43600 with very similar mechanical and physical properties; widely used in European automotive applications. |
| Japan | JIS G4304 | SUS444 | Corresponds to ASTM 444; offers improved corrosion resistance while retaining the ferritic structure. |
Notes:
Weldability: 436 stainless steel can be welded by all common processes using matching or slightly over‑alloyed fillers (e.g., E/ER 309L or Ni‑based). Post‑weld heat treatment is not required for most service environments. Corrosion resistance: In the annealed condition, it exhibits good resistance to oxidation up to 800 °C and adequate resistance to atmospheric corrosion and mild acids. Intergranular attack after welding is prevented by the niobium stabilization. Machining: Machinability is comparable to other ferritic stainless steels; high‑speed steel or carbide tooling with appropriate cutting oils is recommended.
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