Electrical resistance is often thought of as how easily electricity can flow through a specific material. Georg Ohm, a German physicist, is best known for Ohm’s Law. This scientific law says that “the current flow through a conductor is directly proportional to the potential difference (voltage) and inversely proportional to the resistance.” Electrical conductivity in metals follows Ohm’s law. Electrical resistance is the measure of oppositional flow to an electric current. Electricity’s relationship to metal changes based on the specific metal. For example, silver and copper, both metals with only one valence electron, are more conductive to electricity. ASTM A513/A513M-18: Standard Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing provides guidelines specifically on electric-resistance-welded carbon and alloy steel tubing for use as mechanical tubing.
The mechanical tubing discussed in ASTM A513/A513M-18 has been welded. Welding is the process of joining metallic parts usually through the use of heat. Welding has been around for a long time. Early instances of welding can be traced to regions like India and Ireland. Some of these examples go back as far as the Bronze Age.
ASTM A513/A513M-18 has a wide scope. The standard covers electric-resistance-welded carbon and alloy steel tubing for use as mechanical tubing. Mechanical tubing made from hot-rolled or cold-rolled steel is covered under ASTM 513/A513M-18. It also covers square, round, rectangular, and special shape tubing.
ASTM A513/A513M-18’s referenced documents include:
- ASTM A370: Test Methods and Definitions for Mechanical Testing of Steel Products
- ASTM A700: Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment
- ASTM A751: Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
- ASTM A1008/A1008M: Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy, High Strength Low-Alloy with Improved Formability, Solution Hardened, and Bake Hardenable
- ASTM A1011/A1011M: Specification for Steel, Sheet and Strip, Hot-Rolled, Carbon, Structural, High-Strength LowAlloy, High-Strength Low-Alloy with Improved Formability, and Ultra-High Strength
- ASTM A1039/A1039M: Specification for Steel, Sheet, Hot Rolled, Carbon, Commercial, Structural, and High-Strength Low Alloy, Produced by Twin-Roll Casting Process
- ASTM A1040: Guide for Specifying Harmonized Standard Grade Compositions for Wrought Carbon, Low-Alloy, and Alloy Steels
- ASTM E213: Practice for Ultrasonic Testing of Metal Pipe and Tubing
- ASTM E273: Practice for Ultrasonic Testing of the Weld Zone of Welded Pipe and Tubing
- ASTM E309: Practice for Eddy Current Examination of Steel Tubular Products Using Magnetic Saturation
- ASTM E570: Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
- ASME B46.1 Surface Texture
- MIL-STD-129 Marking for Shipment and Storage
- Std. No. 123 Marking for Shipments (Civil Agencies)
ASTM A513/A513M-18 revises the 2015 edition of the same standard, so it has been changed. This change is:
- 7.2 was revised to allow spectrochemical analysis per Practice A751.
ASTM A513/A513M-18: Standard Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing is available on the ANSI Webstore.