ASME SA-513-2021 pdf – SPECIFICATION FOR ELECTRIC-RESISTANCE-WELDED CARBON AND ALLOY STEEL MECHANICAL TUBING
ASME SA-513-2021 pdf – SPECIFICATION FOR ELECTRIC-RESISTANCE-WELDED CARBON AND ALLOY STEEL MECHANICAL TUBING.
tions with inside diameter cleanup allowances is considered to be cylinder tubing. Table S1.l shows the minimum inside diameter allowance for removal of inside surface imperfections by a honing operation.
S2. Cleanup by Centerless Grinding
S2.1 Round tubing, mandrel drawn for applications with outside diameter allowances is considered to be special smooth outside surface tubing. Table S2.l shows the minimum outside diameter stock allowance for removal of outside surface imperfections by centerless grinding.
S3. Cleanup by Machining
S3.1 Cleanup is permitted on round tubing. mandrel drawn for applications where machining is required to remove surface imperfections. Table S3. 1 shows the minimum stock allowance for removal of surface imperfections from either or both the outside and inside surfaces by machining.
S4. Special Smooth Inside Surface
S4.1 Round tubing, special smooth inside diameter for cylinder applications with microinch finish and inside diameter cleanup allowances is considered to he special smooth inside surface tubing. Table S4.l shows the maximum average microinch readings on the inside surface. Table S4.2 shows the minimum wall depth allowance for inside surface imperfections.
S5. Hardness and Tensile Requirements
S5.1 When hardness properties are specified on the order, round tubing shall conform to the hardness limits specified in Table S5. 1 unless Tensile Properties Required” is specified in the purchase order. When ‘Tensile Properties Required” is specified in the purchase order, round tubing shall conform to the tensile requirements and not necessarily the hardness limits shown in Table S5.l. For grades of round tubing not shown in Table S5. I, and for all square and rectangular tubing, tensile or hardness limits shall be upon agreement between the manufacturer and the purchaser.
S5.2 Number of tests and retests shall be as follows:
one tension test per lot shall be made (Note S 1) and 1% of all tubes per lot but in no case less than 5 tubes shall be tested for hardness. If the results of the mechanical tests do not conform to the requirements shown in the table, retests shall he made on additional tubes double the original number selected, each of which shall conform to the specified requirements.
NOTE Si—A lot shall consist of all tubes, before cutting to length, of
the same size and wall thickness which are produced from the same heat of steel and, when heat treated, subjected to the same finishing treatment in a continuous furnace. When final heat treatment is done in a batch- type furnace, the lot shall include all those tubes which are heat treated in the same furnace charge.
S5.3 The yield strength corresponding to a permanent offset of 0.2% of the gage length of the specimen or to a total extension of 0.5% of the gage length under load shall be determined.
S6. Destructive Veld Tests
S6.1 Round tubing and tubing to be formed into other shapes when in the round form shall meet the following destructive weld tests.
S6.2 Flattening Test —A test 4 to 6 in. (101.6 to 152.4 mm) in length shall be flattened between parallel plates with the weld 900 from the direction of applied force (at the point of maximum bending) until opposite walls of the tubing meet. Except as allowed in S6.2.1, no opening in the weld shall take place until the distance between the plates is less than two thirds of the original outside diameter of the tubing. No cracks or breaks in the base metal shall occur until the distance between the plates is less than one third of the original outside diameter of the tubing, but in no case less than five times the thickness of the tubing wall.