ASTM A511 MT 317 Stainless Steel Pipe
ASTM A511 MT 317 Stainless Steel Pipe - Expert Material
Comprehensive material data for ASTM A511 MT 317 stainless steel mechanical tubing: chemical composition, mechanical properties, physical properties, equivalent grades, and application guidance.
Hot working, cold working, machining, welding, solution annealing
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ASTM A511 MT 317 Stainless Steel Pipe Introduction
ASTM A511 MT 317 is an austenitic stainless steel seamless mechanical tube grade featuring elevated molybdenum content (3.0–4.0%) for enhanced pitting and crevice corrosion resistance in chloride environments compared to standard 316 grades. It offers a good combination of strength, ductility, and weldability. The material is typically supplied in the solution-annealed condition and is designed for mechanical and general engineering applications where higher corrosion resistance is required. 317 stainless steel maintains its mechanical properties at both low and moderately high temperatures and exhibits non-magnetic behavior in the annealed state.
ASTM A511 MT 317 Stainless Steel Pipe Chemical Composition
The chemical composition of ASTM A511 MT 317 stainless steel conforms to the requirements for UNS S31700 as specified in ASTM A511. The alloy is characterized by a molybdenum content of 3.0–4.0% for improved corrosion resistance, along with a chromium and nickel content that stabilizes the austenitic structure. Single values are maximum unless otherwise indicated.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | 0.08 max | Maximum allowed |
| Manganese (Mn) | 2.00 max | Maximum allowed |
| Phosphorus (P) | 0.045 max | Maximum allowed |
| Sulfur (S) | 0.030 max | Maximum allowed |
| Silicon (Si) | 1.00 max | Maximum allowed |
| Chromium (Cr) | 18.0 – 20.0 | Range |
| Nickel (Ni) | 11.0 – 15.0 | Range |
| Molybdenum (Mo) | 3.0 – 4.0 | Range |
| Nitrogen (N) | Not specified | May be present as residual |
| Iron (Fe) | Balance | Approximately 57-67% |
ASTM A511 MT 317 Stainless Steel Pipe Thermal and Electrical Physical Properties
The physical properties of 317 stainless steel are representative for the fully austenitic structure in the solution-annealed condition. These values are derived from published data for UNS S31700 and similar grades and are provided for design guidance. Property changes with temperature; specific test condition ranges are given where applicable.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.98 | g/cm³ | At 20 °C |
| Elastic Modulus (E) | 193 | GPa | At 20 °C |
| Shear Modulus (G) | 77 | GPa | At 20 °C (calculated from E and Poisson's ratio) |
| Poisson's Ratio (ν) | 0.27 – 0.30 | — | At 20 °C |
| Thermal Expansion Coefficient (α) | 16.0 | 10⁻⁶/K | 20–100 °C range |
| Thermal Expansion Coefficient (α) | 16.2 | 10⁻⁶/K | 20–200 °C range |
| Thermal Expansion Coefficient (α) | 17.0 | 10⁻⁶/K | 20–500 °C range |
| Thermal Conductivity (λ) | 14.0 | W/m·K | At 100 °C |
| Thermal Conductivity (λ) | 16.3 | W/m·K | At 300 °C |
| Thermal Conductivity (λ) | 18.5 | W/m·K | At 500 °C |
| Specific Heat Capacity (cₚ) | 500 | J/kg·K | At 20 °C |
| Electrical Resistivity (ρₑ) | 0.74 | µΩ·m | At 20 °C |
| Melting Range | 1370 – 1400 | °C | Approximate |
ASTM A511 MT 317 Stainless Steel Pipe Mechanical Properties
Mechanical properties of ASTM A511 MT 317 are determined on solution-annealed tubing according to the standard. The values listed represent minimum requirements for room temperature tensile testing. The test is conducted in accordance with ASTM A370 or equivalent. Elongation is measured over a gauge length of 2 inches or 50 mm. Hardness and bending requirements are not mandatory in ASTM A511 but are often agreed upon between purchaser and supplier.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | 515 min | MPa | Room temperature, longitudinal specimen |
| Yield Strength (ReH, 0.2% offset) | 205 min | MPa | Room temperature, longitudinal specimen |
| Elongation (A, 2 in. or 50 mm) | 35 min | % | Gauge length 50 mm |
| Hardness (Rockwell B) | 90 max (typical) | HRB | Approximate value, not mandatory |
| Hardness (Brinell) | 217 max (typical) | HB | Approximate value, not mandatory |
ASTM A511 MT 317 Stainless Steel Pipe Fully Equivalent Material Standards and Replaceable Grades
| Country / Region | Standard | Grade Designation | Remarks |
|---|---|---|---|
| USA | ASTM A511 | MT 317 | Seamless mechanical tubing; identical grade |
| USA | ASTM A213 / ASTM A269 | TP317 | Seamless/welded tube for boilers, heat exchangers, general service; equivalent chemical and mechanical properties |
| USA | UNS | S31700 | Unified Numbering System designation for 317 |
| USA | AISI | 317 | American Iron and Steel Institute designation |
| Japan | JIS G3459 / JIS G4303 | SUS 317 | Equivalent austenitic stainless steel grade |
| International | ISO 9328-7 (or similar) | X5CrNiMo17-12-3 (might differ slightly) | Check exact Mo range; often 316. For 317 Mo is higher. |
ASTM A511 MT 317 Stainless Steel Pipe Application Introduction
ASTM A511 MT 317 stainless steel tubing is used where superior corrosion resistance compared to 304 and 316 grades is required, particularly in acidic, chloride, and high-temperature aqueous environments. The tubes are easily fabricated by bending, flaring, expanding, and welding. They are suitable for mechanical and pressure applications in accordance with the standard.
Product Applications: Heat exchanger tubes, Boiler tubes, Condenser tubes, Instrumentation tubing, Hydraulic and mechanical tubing, Corrosion-resistant fluid handling lines, Structural hollow sections in corrosive environments
Processed into products: Tube bundles for heat exchangers, U-bend tubes, Spray bars and nozzles, Shafts and axles in corrosive service, Valve stems and fittings, Custom machined parts such as bushings and sleeves, Welded tubular frames for chemical tanks
Application industries: Chemical and petrochemical processing, Pulp and paper, Desalination plants, Marine and offshore engineering, Food and beverage processing (where extra corrosion resistance is needed), Pharmaceutical industry, Heat exchanger and condenser manufacturing, Pollution control equipment
ASTM A511 MT 317 Stainless Steel Pipe Similar/Comparable Substitute Material Recommendations
| Country / Region | Standard | Grade Designation | Remarks |
|---|---|---|---|
| Europe | EN 10088-2 / 10088-3 | 1.4438 (X2CrNiMo18-15-4) | 317L grade with lower carbon (0.03 max) for improved weldability; slightly higher nickel. Mechanical properties may differ, but corrosion resistance similar. |
| Europe | EN 10088-2 | 1.4449 (X3CrNiMo18-12-3) | Carbon content ≤0.04%, Mo 2.5-3.0% – lower Mo than 317, closer to a lean 317. Offers reasonable substitution with caution regarding corrosion performance. |
| USA | ASTM A240 / A511 | MT 316L (UNS S31603) | Lower molybdenum (2.0-2.5%) reduces pitting resistance; suitable for less aggressive environments. |
| USA | ASTM A511 | MT 317L (UNS S31703) | Low-carbon variant; nearly identical corrosion resistance but slightly lower strength in annealed condition. Direct substitute for welded structures. |
Notes:
ASTM A511 MT 317 stainless tubes may be supplied in lengths of 6 m, 12 m, or cut-to-length. The standard also allows supplementary requirements (S1 to S6) for non-destructive testing, etching, tolerance control, etc., which should be agreed upon at the time of order. For high-temperature applications, refer to ASTM A213 TP317 pressure tube data. Note that this grade does not exhibit magnetic properties in the annealed condition but may become slightly magnetic after cold working. Welding procedures should follow standard practices for austenitic stainless steels, typically using ER317 or E317 electrodes.
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