ASTM A511 Seamless Stainless Steel Mechanical Tubing Specification
What is the ASTM A511/A511M standard?
ASTM A511 is a standard specification from ASTM International covering seamless stainless steel mechanical tubing. This tubing is designed for mechanical applications where corrosion resistance and high-temperature strength are essential. The specification includes various austenitic, ferritic, and martensitic stainless steel grades, such as 304, 316, 321, and 347. It covers both cold-finished and hot-finished seamless tubing with a wide range of sizes and shapes, including round, square, and rectangular.
ASTM A511 Stainless Steel Mechanical Tubing Chemical Composition
ASTM A511 stainless steel mechanical tubing encompasses various grades, each with a specific chemical composition. Common grades include 304, 304L, 316, and 316L, among others. These grades are characterized by varying percentages of carbon, manganese, phosphorus, sulfur, silicon, nickel, and chromium. For example, 304 typically contains 18-20% chromium and 8-10.5% nickel. 316 and 316L contain 16-18% chromium, 10-14% nickel, and 2-3% molybdenum.
ASTM A511 stainless steel cold-Finished pipe tolerances
ASTM A511 specifies tolerances for seamless stainless steel mechanical tubing, including cold-finished round tubing. These tolerances vary based on the outside diameter (OD) and wall thickness of the tubing, with wall thickness tolerances typically being ±10% of the specified wall thickness.
ASTM A511 Hot-Finished Round Tubing Tolerances
These tolerances appiyto cutlengths up to and including 24 ft (7.3 m. For lenghs over 24 ft an additional over tolerance of % in.(3.1 mm for each 10 ft (3 m) or faction thereof shall be permissible, up to a maximum tolerance of ½ in. (12.7 mm).
ASTM A511Cold-/Finished or Hot-/Finished Round Tubing Straightness Tolerances
A common method of measuring straightness is to use a 3-inch (0.9-meter) straightedge and feeler gauge. If measured with a dial indicator, the value obtained is approximately twice the value measured with a straightedge and feeler gauge.
