If you're sourcing seamless stainless steel mechanical tubing for high-precision engineering, understanding ASTM A511/A511M-04 is essential. This standard covers seamless stainless steel tubing for mechanical applications where dimensional accuracy, smooth internal surfaces, and mechanical strength are critical. Whether you're in aerospace, automotive, or industrial machinery manufacturing, ASTM A511 provides a reliable framework for evaluating tubing quality.
ASTM A511/A511M is a standard specification from ASTM International that covers seamless stainless steel mechanical tubing. This specification applies to tubing used in mechanical applications where corrosion resistance or high-temperature strength is needed. It includes both cold-finished and hot-finished tubes, with sizes up to 12 3/4 inches (313.8 mm) in outside diameter and various wall thicknesses.
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 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.
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).
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.
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