ASTM A511 Stainless Steel Seamless Tubes: Precision Mechanical Tubing
Amardeep Steel Centre is a prominent Manufacturer, Supplier, and Exporter of high-quality ASTM A511 Stainless Steel Seamless Tubes. This specification covers seamless stainless steel tubing intended for mechanical applications where superior corrosion resistance, high-temperature strength, or specific aesthetic qualities are required. Our ASTM A511 Stainless Steel Seamless Tubing is engineered for precision, durability, and reliable performance across a wide range of demanding industrial and commercial uses.
What is ASTM A511 Stainless Steel Seamless Mechanical Tubing?
ASTM A511 Tubing is a standard specification covering seamless stainless steel mechanical tubing. Unlike piping designed primarily for fluid conveyance under pressure, ASTM A511 Stainless Steel Mechanical Seamless Tubes are intended for a broad spectrum of mechanical and structural applications where close dimensional tolerances, specific mechanical properties, and good surface finish are often critical. The "seamless" nature means these tubes are produced from a solid billet, pierced and then hot-finished or cold-drawn to final dimensions, resulting in a homogenous structure without any weld seams.
The ASTM A511 Stainless Steel Tube specification encompasses a wide variety of stainless steel grades, including austenitic (e.g., MT304, MT316, MT321, MT347), ferritic, and martensitic types, allowing for selection based on the specific requirements of corrosion resistance, strength, and high-temperature performance. ASME SA511 tubing is often considered an equivalent standard for certain applications. This versatility makes SS ASTM A511 Seamless Tubes a preferred choice for engineered components.
ASTM A511 Stainless Steel Seamless Mechanical Tubing Specifications
Amardeep Steel supplies ASTM A511 Stainless Steel Seamless Tubing conforming to rigorous industry standards.
| Specification Attribute | Details for ASTM A511 Stainless Steel Seamless Tubes |
|---|---|
| Primary Standard | ASTM A511 / A511M; ASME SA511 (for some grades/applications) |
| Common Austenitic Grades | MT304, MT304L, MT309S, MT310S, MT316, MT316L, MT317, MT321, MT347 |
| Common Ferritic/Martensitic Grades | MT403, MT405, MT410, MT416Se, MT429, MT430, MT440A, MT446, and others. |
| Manufacturing Process | Seamless (Hot Finished or Cold Finished/Cold Drawn). ASTM A511 cold drawn stainless steel tubing offers tighter tolerances and improved surface finish. |
| Shapes | Round (ASTM A511 round mechanical tubing), Square, Rectangular, Oval, Hexagonal, and Special Profiles as specified. |
| Outside Diameter (OD) | Typically from 1/4” (6.35mm) up to 12-3/4” (323.8mm) for round tubing. Other sizes and shapes have specific ranges. |
| Wall Thickness (WT) | From approx. 0.020” (0.5mm) up to 1” (25.4mm) or more, depending on OD and grade. |
| Length | Standard mill lengths, random lengths, or custom cut-to-length services. |
| Heat Treatment | Austenitic tubes are typically supplied in the annealed condition. Ferritic and martensitic grades are heat-treated according to standard requirements or customer specifications to achieve desired mechanical properties. |
| Testing & Certification | Dimensional checks, Mechanical Tests (tensile, hardness, flattening/flaring as applicable per A511), Chemical Analysis. Mill Test Certificate (MTC) to EN 10204 3.1. |
Chemical Composition of Common ASTM A511 Grades (Typical wt %)
The ASTM A511 specification includes numerous stainless steel grades. Below are typical compositions for some frequently used austenitic, ferritic, and martensitic types.
| Grade | C (Carbon) Max | Mn (Manganese) Max | P (Phosphorus) Max | S (Sulfur) Max | Si (Silicon) Max | Cr (Chromium) | Ni (Nickel) | Mo (Molybdenum) | Other Elements |
|---|---|---|---|---|---|---|---|---|---|
| MT304 | 0.08 | 2.00 | 0.040 | 0.030 | 1.00 | 18.0 - 20.0 | 8.0 - 11.0 | - | - |
| MT304L | 0.035 | 2.00 | 0.040 | 0.030 | 1.00 | 18.0 - 20.0 | 8.0 - 13.0 | - | N: 0.10 max (often specified) |
| MT316 | 0.08 | 2.00 | 0.040 | 0.030 | 1.00 | 16.0 - 18.0 | 10.0 - 14.0 | 2.00 - 3.00 | - |
| MT316L | 0.035 | 2.00 | 0.040 | 0.030 | 1.00 | 16.0 - 18.0 | 10.0 - 15.0 | 2.00 - 3.00 | N: 0.10 max (often specified) |
| MT321 | 0.08 | 2.00 | 0.040 | 0.030 | 1.00 | 17.0 - 20.0 | 9.0 - 13.0 | - | Ti: 5x(C+N) min - 0.70 max |
| MT347 | 0.08 | 2.00 | 0.040 | 0.030 | 1.00 | 17.0 - 20.0 | 9.0 - 13.0 | - | Cb+Ta: 10xC min - 1.10 max |
| MT410 (Martensitic) | 0.15 | 1.00 | 0.040 | 0.030 | 1.00 | 11.5 - 13.5 | 0.50 max | - | - |
| MT430 (Ferritic) | 0.12 | 1.00 | 0.040 | 0.030 | 1.00 | 16.0 - 18.0 | 0.50 max | - | - |
Mechanical Properties of Common ASTM A511 Grades
Mechanical properties vary by grade and heat treatment condition. The following are typical minimum values for common austenitic grades in the annealed condition, and representative values for others.
| Grade | Tensile Strength min. psi [MPa] | Yield Strength min. (0.2% offset) psi [MPa] | Elongation in 2" (50mm) min. % | Hardness (Max, unless noted) |
|---|---|---|---|---|
| All Austenitic (e.g., MT304, MT304L, MT316, MT316L, MT321, MT347) | 75,000 [515] | 30,000 [205] | 35 | 90 HRB / 192 HBW |
| MT403 (Martensitic, Annealed) | 60,000 [415] | 30,000 [205] | 20 | 95 HRB / 207 HBW |
| MT410 (Martensitic, Annealed) | 60,000 [415] | 30,000 [205] | 20 | 95 HRB / 207 HBW |
| MT429/MT430 (Ferritic, Annealed) | 60,000 [415] | 35,000 [240] | 20 | 90 HRB / 190 HBW |
| MT446-1 (Ferritic, Annealed) | 70,000 [485] | 40,000 [275] | 18 | 95 HRB / 207 HBW |
ASTM A511 Tubing Tolerances
ASTM A511 Stainless Steel Seamless Tubes are manufactured to specific dimensional tolerances. While the standard provides detailed tables for various shapes, sizes, and conditions (hot-finished vs. cold-finished), below is a simplified example illustrating typical Outside Dimension (OD) tolerances for Square and Rectangular Seamless Mechanical Tubing:
| Largest Specified Outside Dimension (Across Flats), Inches | Applicable Wall Thickness Range, Inches | Outside Dimension (OD) Tolerance, ± Inches |
|---|---|---|
| To 1-1/4 | All | 0.015 |
| Over 1-1/4 to 2-1/2 (assuming a typo in your input, was "2") | All | 0.020 |
| Over 2-1/2 to 5-1/2 (assuming a typo in your input, was "5") | All | 0.030 |
| Over 5-1/2 | All | 0.060 |
Manufacturing of Stainless Steel ASTM A511 Seamless Tubes:
- Billet Preparation: High-quality certified stainless steel billets of the specified grade are selected.
- Hot Working (Piercing & Rolling): Billets are heated and then pierced to create a hollow shell. This shell is often further hot-rolled to reduce wall thickness and elongate the tube. This results in Hot-Finished Seamless Tubing.
- Cold Finishing (Drawing) (Optional but Common): For tighter tolerances, improved surface finish, and enhanced mechanical properties, hot-finished tubes can be further cold-drawn through dies and over mandrels. This produces ASTM A511 cold drawn stainless steel tubing. Intermediate annealing may be required between drawing passes.
- Heat Treatment: Tubes are heat-treated (e.g., annealed for austenitic grades) to relieve stresses from forming, optimize microstructure, and achieve the required mechanical properties.
- Straightening, Cutting & Finishing: Tubes are straightened, cut to specified lengths, and may undergo further finishing operations like polishing or passivation.
Heat Treatment of ASTM A511 Stainless Steel Grades
Proper heat treatment is essential for achieving the desired mechanical properties, corrosion resistance, and microstructure in ASTM A511 Stainless Steel Seamless Tubes. The typical heat treatment varies by the stainless steel family:
| Stainless Steel Family | Common ASTM A511 Grades (Examples) | Typical Heat Treatment Type(s) | Typical Temperature Range °F [°C] | Quench/Cooling Method | Primary Purpose(s) |
|---|---|---|---|---|---|
| Austenitic | MT304, MT304L, MT316, MT316L, MT321, MT347 | Solution Annealing & Quench | Annealing: 1900–2100 [1040–1150] | Rapid quench in water or rapid air cool (for thin sections) | Relieve stresses, dissolve carbides, maximize corrosion resistance, optimize ductility & toughness, refine grain structure. |
| Ferritic | MT405, MT429, MT430, MT446 | Annealing | Annealing: Approx. 1400–1600 [760–870] | Air cool or furnace cool. (Rapid cool for some grades to avoid 475°C embrittlement) | Relieve stresses, improve ductility & toughness, refine grain structure. Not hardenable by conventional heat treatment. |
| Martensitic | MT403, MT410, MT414, MT440A | 1. Annealing (for supply/machinability) 2. Hardening & Tempering (for final properties) |
1. Annealing: Varies (Subcritical or Full) 2. Hardening (Austenitizing): 1700–1950 [925–1065] 3. Tempering: 300–1400 [150–760] |
1. Slow cool 2. Oil or Air Quench (after austenitizing) 3. Air Cool (after tempering) |
1. Soften for machinability/formability. 2. Achieve high strength & hardness, then temper to improve toughness and adjust final properties. |
Applications of ASTM A511 Stainless Steel Tubing
The versatility and robust properties of ASTM A511 Tubing make it suitable for a wide range of mechanical and structural applications where corrosion resistance or high-temperature strength is necessary:
- Machinery & Equipment Components: Shafts, rollers, bearings, bushings, cylinders, and other structural or moving parts.
- Automotive & Transportation: Structural components, exhaust system parts (for certain grades), suspension components.
- Aerospace & Defense: Components requiring high strength-to-weight ratio and corrosion resistance.
- Fluid Power Systems: Hydraulic and pneumatic cylinder barrels (often honed).
- Agricultural Equipment: Structural members and moving parts for machinery.
- Construction & Architecture: Structural supports, railings, ornamental features (for specific grades and finishes).
- Material Handling Equipment: Conveyor rollers, support frames.High-Temperature
- Applications: Components for furnaces, heat exchangers, and other equipment operating at elevated temperatures (using appropriate high-temperature grades within A511).
- Corrosive Environments: Parts exposed to chemicals or other corrosive media (using appropriate corrosion-resistant grades like MT316L).
The wide range of available grades and shapes, including ASTM A511 round mechanical tubing, square, and rectangular profiles, allows for tailored solutions.
Why Choose Amardeep Steel for Your ASTM A511 Stainless Steel Seamless Tubes?
Amardeep Steel is your premier Manufacturer, Supplier, and Exporter of ASTM A511 Stainless Steel Seamless Tubes in India and for the global market:
- Wide Range of Grades & Shapes: We offer an extensive selection of austenitic, ferritic, and martensitic grades in round, square, rectangular, and special profiles as per ASTM A511 Tubing specifications.
- Hot-Finished & Cold-Finished Options: Catering to diverse needs for tolerances and surface finish, including ASTM A511 cold drawn stainless steel tubing.
- Stringent Quality Control: Our ISO 9001 certified processes ensure that every SS ASTM A511 Seamless Tube meets high standards of quality and dimensional accuracy.
- Competitive Pricing: We provide an excellent Price for high-quality ASTM A511 Stainless Steel Tube, offering superior value.
- Global Export Network: Proven experience in efficiently exporting Stainless Steel ASTM A511 Seamless Tubes worldwide.
- Customization & Technical Expertise: We offer cut-to-length services, custom orders, and expert technical support to assist with grade selection and application challenges.
Related Products
Here are some related products to ASTM A511 Stainless Steel Seamless Tubes that might be of interest, as they share similar applications, materials, or manufacturing processes:
- ASTM A213/A213M Seamless Tubes
- ASTM A269 / A269M Seamless Tubes
- Stainless Steel Seamless Steel Pipe
- Cold Drawn Steel Pipes Seamless Tube
- Hot Rolled Steel Pipes Seamless Tube
- Hot Expanded Pipes Seamless Tube
- API 5L Pipes
- Precision Tubes
- Seamless Boiler Steel Pipes
- Seamless Structural Steel Pipes
Get Your ASTM A511 Stainless Steel Seamless Tubing Price & Consultation
For the latest Price, detailed technical specifications, or to discuss your project requirements for ASTM A511 Stainless Steel Seamless Tubes, contact the mechanical tubing experts at Amardeep Steel Centre today. We are committed to providing high-quality ASTM A511 Stainless Steel Seamless Tubing, including ASTM A511 round mechanical tubing and ASTM A511 cold drawn stainless steel tubing, tailored to your precise applications.