ASTM A249 PDF

More A Heat and product analysis shall conform to the requirements as to chemical composition for carbon, manganese, phosphorous, sulfur, silicon, chromium, nickel, molybdenum, nitrogen, copper, and others. All materials shall be furnished in the heat-treated condition in accordance with the required solution temperature and quenching method. When the final heat treatment is in a continuous furnace, the number of tubes of the same size and from the same heat in a lot shall be determined from the prescribed size of the tubes.

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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this speci?

Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the speci?

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. A speci?

Referenced Documents 2. Current edition approved May 1, Published June Originally approved in Ordering Information 3.

Such requirements may include, but are not limited to, the following: 3. Copper Other Other Cb 10x C Cb 10x C TP TPH A Maximum, unless otherwise indicated.

C The method of analysis for nitrogen shall be a matter of agreement between the purchaser and manufacturer. D For small diameter or thin walls, or both, where many drawing passes are required, a carbon maximum of 0. Small outside diameter tubes are de? General Requirements 4. Manufacture 5. The method of cold working may be speci? When cold drawn, the purchaser may specify the minimum amount of reduction in cross-sectional area or wall thickness, or both.

Heat Treatment 6. When speci? Chemical Composition 7. Product Analysis 8. The chemical composition thus determined shall conform to the requirements given in Section 7. The product analysis tolerance is not applicable to the carbon content for material with a speci? Both retests for the elements in question shall meet the requirements of the speci? The manufacturer is not required to run the test unless it is speci? Note that Practices A requires the test to be performed on sensitized specimens in the low carbon and stabilized types and on specimens representative of the as-shipped condition of the other types.

B Quenched in water or rapidly cooled by other methods. DCooled in still air, or faster. Lengths of? NOTE 1—For? When the? NOTE 2—For tension and hardness test requirements, the term lot applies to all tubes prior to cutting, of the same nominal diameter and wall thickness which are produced from the same heat of steel.

Tensile Requirements 9. Hardness Requirements Reverse-Bend Test Requirement The sample shall then be opened and bent around a mandrel with a maximum thickness of four times the wall thickness, with the mandrel parallel to the weld and against the original outside surface of the tube.

The weld shall be at the point of maximum bend. There shall be no evidence of cracks, or of overlaps resulting from the reduction in thickness of the weld areas by cold working. When the geometry or size of the tubing make it difficult to test the sample as a single piece, the sample may be sectioned into smaller pieces provided a minimum of 4 in. NOTE 3—The reverse bend test is not applicable when the speci? Under these conditions the reverse? S 90 [] 40 [] S t 0. S 75 [] 30 [] S 80 [] 35 [] S [] 62 [] S 78 [] 37 [] N t 0.

N 71 [] 31 [] The tensile properties of such small diameter or thin wall tubes shall be a matter of agreement between the manufacturer and the purchaser.

Grain Size Requirement Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes Note 2. The purchaser may specify which test is to be used. The test is not required unless S7 is speci? Permissible Variations in Dimensions Workmanship, Finish, and Appearance Surface Condition When bright annealing is used, pickling or chemical descaling is not necessary.

Forming Operations All tubes, when properly manipulated, shall be able to stand expanding and beading without showing cracks and? Product Marking Keywords Stress-Relieved Annealed Tubes S1. Details of these supplemental requirements shall be agreed upon by the manufacturer and the purchaser. Cooling from this temperature range may be either in air or by slow cooling. No mechanical straightening is permitted after the stress-relief treatment.

Minimum Wall Tubes S2. Such tubes shall satisfy the minimum wall thickness requirements of Speci? In addition to the marking required by Section 18, the tubing shall be marked S2. Air Underwater Pressure Test S3. Stabilizing Heat Treatment S4. The temperature of stabilization heat treatment shall be at a temperature as agreed upon between the purchaser and vendor.

Unstraightened Tubes S5. Intergranular Corrosion Test S6. NOTE S6. Weld Decay Test S7. Shorter, 1-in.

Split the sample longitudinally to allow for easy micrometer measurements. Remove all burrs and sharp edges by lightly grinding. Remove dust and grease by cleaning with soap and water or other suitable solvents. Then, place sample s in the? It is not recommended to test more than four samples together, or to mix alloy types. Warning—Protect eyes and use rubber gloves when handling acid. Mixing shall be done under a hood and testing shall be run under a hood. The volume of the solution shall be approximately mL.

In both cases, take measurements at approximately equal longitudinal intervals along the section lengths. Make these measurements with a sharp pointed micrometer accurate to at least 0. The micrometer must be suitable for measuring the small features in the surface after testing. Typical pin micrometers have tapered anvils with a tip radius of less than 0.

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Difference between ASTM A249, A269, A270, and A554 Stainless steel tubing

The possible conditions range from a "mill finish" i. Surface finishes may also be specified in terms of Ra values, but no limits are given in the specification. Clause Thus a large proportion of A tube used in the Australian market is supplied in the externally polished or buffed conditions, in the range of about - , or with a very highly polished Surface , typically stated as

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