ASTM A511 MT 430 Stainless Steel Seamless Mechanical Tubing
ASTM A511 MT 430 Stainless Steel Seamless Mechanical Tubing
Comprehensive technical data for ASTM A511 MT 430 stainless steel pipe, including chemical composition, mechanical and physical properties, equivalent standards, and application guidance.
Cold drawing, hot finishing, machining, welding, bending
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ASTM A511 MT 430 Stainless Steel Seamless Mechanical Tubing Introduction
ASTM A511 MT 430 is a ferritic stainless steel grade supplied as seamless mechanical tubing. It offers good corrosion resistance, formability, and oxidation resistance, combined with moderate mechanical strength. The alloy is non-hardenable by heat treatment and is typically used in the annealed condition. Key characteristics include excellent resistance to stress corrosion cracking in chloride environments, good ductility, and the ability to be readily welded and machined.
- Ferritic structure provides magnetic properties.
- Resistant to scaling up to approximately 815°C in continuous service.
- Commonly used for automotive exhaust components, heat exchanger tubing, and general mechanical applications.
ASTM A511 MT 430 Stainless Steel Seamless Mechanical Tubing Chemical Composition
The chemical composition for ASTM A511 MT 430 as specified in the standard. The analysis represents heat and product limits. Iron is the balance.
| Element | Standard Value (max % unless range given) | Remarks |
|---|---|---|
| Carbon (C) | 0.12 | |
| Manganese (Mn) | 1.00 | |
| Phosphorus (P) | 0.040 | |
| Sulfur (S) | 0.030 | |
| Silicon (Si) | 1.00 | |
| Chromium (Cr) | 16.00 - 18.00 | |
| Nickel (Ni) | 0.75 | |
| Iron (Fe) | Balance | Approximately 79–82% |
ASTM A511 MT 430 Stainless Steel Seamless Mechanical Tubing Thermal and Electrical Physical Properties
Physical properties at ambient temperature unless otherwise noted. Values are typical for ferritic stainless steel grade 430 and may vary slightly depending on processing and exact composition.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.70 | g/cm³ | 20°C |
| Elastic Modulus (E) | 200 | GPa | 20°C |
| Shear Modulus (G) | 78 | GPa | 20°C, calculated from E and ν |
| Poisson's Ratio (ν) | 0.28 | — | 20°C |
| Thermal Expansion Coefficient (α) | 10.4 | ×10⁻⁶/°C | 20–100°C |
| Thermal Expansion Coefficient (α) | 11.0 | ×10⁻⁶/°C | 20–500°C |
| Thermal Conductivity (λ) | 26 | W/(m·°C) | 100°C |
| Specific Heat Capacity (Cp) | 460 | J/(kg·°C) | 20°C |
| Electrical Resistivity (ρₑ) | 0.60 | µΩ·m | 20°C |
ASTM A511 MT 430 Stainless Steel Seamless Mechanical Tubing Mechanical Properties
Mechanical properties are based on ASTM A511 requirements for seamless mechanical tubing in the annealed condition. Testing is performed at room temperature. Elongation requirements vary with wall thickness.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 517 (75) | MPa (ksi) | Room temperature, longitudinal |
| Yield Strength (ReH, 0.2% offset) | ≥ 276 (40) | MPa (ksi) | Room temperature, longitudinal |
| Elongation (A) | ≥ 20 | % | Wall thickness < 5/16 in., gauge length 2 in. |
| Elongation (A) | ≥ 25 | % | Wall thickness ≥ 5/16 in., gauge length 2 in. |
| Hardness | ≤ 90 HRB | HRB | Rockwell B, typical for annealed condition |
ASTM A511 MT 430 Stainless Steel Seamless Mechanical Tubing Completely Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A511 | MT 430 | Original specification, UNS S43000 |
| International | ISO 9329-4 | X6Cr17 | Same as EN 1.4016 |
| European Union | EN 10216-5, EN 10088-1 | 1.4016 (X6Cr17) | Fully equivalent ferritic grade |
| Japan | JIS G3463 | SUS430TB | Seamless boiler and heat exchanger tubes |
| Japan | JIS G3446 | SUS430 | Stainless steel pipes for machine and structural purposes |
| China | GB/T 14976, GB/T 1220 | 10Cr17 | Equivalent Chinese ferritic stainless steel |
ASTM A511 MT 430 Stainless Steel Seamless Mechanical Tubing Application Introduction
ASTM A511 MT 430 is widely used in mechanical and structural applications requiring corrosion resistance and moderate strength. Its good formability allows manufacturing of complex shapes. Typical applications and processing are summarized below.
Product Applications: Seamless tubing for fluid transport, Structural hollow sections, Heat exchanger tubes, Exhaust pipes and tubing, Conveyor rollers and guide rails
Processed into products: Muffler and exhaust pipe assemblies, Heat exchanger tube bundles, Machine tool spindles and shafts, Bushings and wear rings, Kitchen sink bowls and base frames, Decorative architectural tubing
Application industries: Automotive (exhaust systems, mufflers, catalytic converter shells), Food processing and kitchen equipment (sinks, countertops, containers), Heat exchangers and boiler components, Architecture (trim, decorative panels, handrails), General engineering (shafts, bushings, fasteners)
ASTM A511 MT 430 Stainless Steel Seamless Mechanical Tubing Similar or Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A511 | MT 434 (UNS S43400) | Higher Mo content improves corrosion resistance |
| USA | ASTM A511 | MT 439 (UNS S43035) | Stabilized with Ti, better weldability |
| European Union | EN 10088-2 | 1.4017 (X6CrNi17-1) | Contains small Ni, balanced properties |
| Japan | JIS G4304 | SUS430LX | Low interstitial 430 with improved toughness |
| China | GB/T 3280 | 019Cr18MoTi | Stabilized ferritic, better for high temperature |
Notes:
Processing notes: MT 430 is magnetic and non-hardenable by heat treatment. Annealing is typically performed at 760–815°C followed by air cooling or water quenching. Cold working increases strength. Welding requires preheating (150–200°C) and post-weld annealing for optimal corrosion resistance. Corrosion resistance: Resists nitric acid, organic acids, and atmospheric corrosion. Not suitable for reducing acids or chloride environments where pitting may occur. Surface finish: Available with pickled, bright annealed, or polished surfaces depending on application requirements.
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