ASTM A268 PDF

More A The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, aluminum, copper, nitrogen, titanium, and columbium. The number of tubes in a lot heat treated by the continuous process shall be determined from the size of the tubes. The steel shall conform to the following tensile properties: tensile strength, yield strength, and elongation.

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A number in parentheses indicates the year of last reapproval. A superscript epsilon? This standard has been approved for use by agencies of the Department of Defense. Two of these grades, TP and UNS S Table 1 , are amenable to hardening by heat treatment, and the high-chromium, ferritic alloys are sensitive to notch-brittleness on slow cooling to ordinary temperatures.

These features should be recognized in the use of these materials. Grade TP is used primarily for hot-water tank service and does not require post-weld heat treatment to prevent attack of the heat affected zone.

Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Referenced Documents 2. Terminology 3. If the? Ordering Information 4. Such requirements may include, but are not limited to, the following: 4.

Current edition approved April 1, Published May Originally approved in DOI: Small outside diameter tubes are de?

D Nickel plus copper. Billets, lengths of? Tensile Requirements Hardness Requirements TABLE 3 Tensile Requirements Tensile strength, min, ksi [MPa] 60 [] 55 [] 60 [] 60 [] 70 [] 70 [] 65 [] 55 [] 60 [] 60 [] [] 65 [] 68 [] 60 [] 80 [] 85 [] 90 [] 75 [] Yield ElongationA,B strength, in 2 in.

S General Requirements 5. Manufacture 6. Heat Treatment 7. Chemical Composition 8. Product Analysis 9. The chemical composition thus determined shall conform to the requirements speci?

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?

Mechanical property requirements do not apply to tubing smaller than 1? B For longitudinal strip tests a deduction of 0. In such tubes, the maximum and minimum diameters at any cross section shall deviate from the nominal diameter by no more than twice the permissible variation in outside diameter given in Table 6; however, the mean diameter at that cross section must still be within the given permissible variation.

NOTE 1—Very thin wall tubing may not be stiff enough for the outside diameter to be accurately measured with a point contact test method, such as with the use of a micrometer or caliper.

When very thin walls are speci? On larger diameters, measurement is commonly performed with a pi tape. Other test methods such as optical test methods may also be considered.

A Calculated elongation requirements shall be rounded to the nearest whole number. Note—The above table gives the computed minimum values for each 1? Surface Condition A slight amount of oxidation will not be considered as scale. Any special? Mechanical Tests Required Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes. For tubes over 8 in. Intergranular Corrosion Test Brinell Hardness, max B Rockwell hardness, C scale.

Permissible Variations in Dimensions On such sizes a variation in wall thickness of For tubes less than 1? B These tolerances apply to cut lengths up to and including 24 ft [7. For lengths greater than 24 ft [7. C Ovality provisions of A Practices A, using samples prepared as agreed upon between the seller and the purchaser. Hydrostatic or Nondestructive Electric Test The type of test to be used shall be at the option of the manufacturer, unless otherwise speci? Product Marking Keywords Pneumatic Test S1.

It is not mandatory for all ASME applications. This condition is referred to as end effect. This portion, as determined by the manufacturer, shall be removed and discarded. Approved April 1, 1 Revised Supplementary Requirement S1 to accommodate the two pneumatic test methods now de? ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm. Permission rights to photocopy the standard may also be secured from the ASTM website www.

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