What is the ASTM A511 standard?
ASTM A511 is a standard specification that covers seamless stainless steel mechanical tubing and hollow bars. The tubing is made by punching holes in solid steel billets and then hot-working or cold-working to the final dimensions. The specification covers MT304 and MT316 round tubing, which is the most common, but the standard also includes square, rectangular and custom shapes. The tubing is usually supplied in an annealed condition.
What is ASTM A269 material?
ASTM A269 is a standard specification for seamless and welded austenitic stainless steel tubes suitable for general corrosion resistance and high or low temperature environments. It is the preferred standard for general-purpose stainless steel tubes (such as hydraulic lines, instrumentation, and pharmaceutical equipment), but does not include standards for specialized boilers or condensers.
ASTM A511 vs ASTM A269: Key Differences
| Feature | ASTM A511 | ASTM A269 |
| Standard Specification for Seamless Stainless Steel Mechanical Tubing | Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service | |
| Primary Application | Mechanical parts, bushings, spacers, structural components, and parts requiring machining. | General corrosion-resisting service, low or high-temperature service, fluid lines, and instrumentation. |
| Manufacturing Process | Seamless only. (Hot-finished or cold-finished). | Seamless or Welded. |
| Material Grades | Austenitic, Ferritic, Martensitic, and Duplex stainless steels. | Primarily Austenitic stainless steels (e.g., 304, 316, 317, 321, 347). |
| Dimensional Focus | Focuses on OD (Outside Diameter) and Wall Thickness, or ID and Wall Thickness to suit machining needs. | Focuses on precise OD and Average Wall Thickness for fitting and flow consistency. |
| Tolerances | Generally larger/looser. Optimized for machining allowances (often allows for "cleanup"). | Much tighter/stricter tolerances on OD and Wall to ensure compatibility with compression fittings. |
| Mechanical Testing | Usually not required unless specifically requested by the purchaser. | Mandatory. Includes Hardness test, Flaring test (seamless), and Flange test (welded). |
| Pressure Testing | Not required (Hydrostatic/Eddy current tests are optional). | Mandatory. Must undergo Hydrostatic or Nondestructive Electric Test (Eddy Current). |
| Heat Treatment | Can be "As Rolled" (for Martensitic/Ferritic) or Annealed. | Mandatory. All material must be furnished in the heat-treated (Solution Annealed) condition. |
| Surface Finish | May have a rougher surface (Hot finished) or typical cold-drawn finish. | Usually smooth, bright annealed, or polished surface. |
What is the difference between A269 and A270?
The primary difference is that ASTM A269 is for general-service stainless steel tubing where mechanical integrity and corrosion resistance are the focus, while ASTM A270 is a sanitary specification that requires specific, highly polished surface finishes for use in food, beverage, and pharmaceutical industries.
What is the difference between ASTM A213 and ASTM A269?
ASTM A213 and ASTM A269 are both stainless steel tubing standards, but they differ fundamentally in their applications and manufacturing specifications. A213 is engineered for high-pressure, high-temperature equipment like boilers and heat exchangers. A269 is a general-purpose standard used for moderate-condition, corrosion-resistant fluid and gas transport.
What is the difference between ASTM A269 and ASTM A312?
ASTM A269 and ASTM A312 are specifications for austenitic stainless steel. ASTM A269 applies to tubing for general corrosive and temperature services, requiring precise dimensions and finishes for instrumentation and low-pressure systems. ASTM A312 governs pipe for high-temperature, industrial pressure applications.
ASTM A511 ASTM A269 stainless steel pipe suppliers
If you have project requirements for ASTM A511 and ASTM A269 stainless steel pipes, please feel free to place an order. GNEE has a large inventory of popular products for you to choose from, including 304, 316, MT304, MT316, etc. For detailed chemical compositions and free samples, please contact our factory immediately. We offer competitive prices and excellent service.
| Feature | ASTM A511 | ASTM A269 |
| Product Type | Seamless Mechanical Tubing / Hollow Bar | Seamless and Welded General Service Tubing |
| Common Grades | 304/304L, 316/316L, 321, 310S, 410, 430, 904L, Duplex 2205/2507 | 304/304L, 316/316L, 317L, 321, 347, S31254 (6-Moly) |
| Outside Diameter (OD) | 6.0 mm to 1219 mm (up to 48") | 6.35 mm (1/4") to 219.1 mm (8") |
| Wall Thickness (WT) | 0.5 mm to 100 mm (Heavy wall specialty) | 0.5 mm to 12.7 mm |
| Length | Single Random, Double Random, or Fixed Length (up to 18m) | 6 meters (standard) or Coiled Tubing (up to 1000m+) |
| Surface Finish | Hot Finished, Cold Drawn, Annealed & Pickled (AP), Machined | Bright Annealed (BA), Polished (Grit 180, 240, 320, 400, 600) |
| End Preparation | Plain ends, Beveled ends, or Square cut | Plain ends, Square cut (burr-free for fittings) |
| Testing Available | Chemical/Mechanical Analysis, UT (Ultrasonic), Dimensional Inspection | Hydrostatic Test, Eddy Current Test, Flaring & Flattening Tests |
| Processing Services | CNC Machining, Boring, Honing, Cutting to size | Precision Bending, Coiling, Laser Cutting, Polishing |
