ASTM Standards::} 70 Test Methods and Definitions for Mechanical Testing of Steel Products. 3. Terminology. Definitions—For definitions of terms used. Chemical and mechanical properties of ASTM A duplex and super-duplex pipe materials. What is duplex steel, use cases, corrosion resistance vs. SS. ASTM A/AM: Standard Specification for Seamless and Welded Ferritic/ Austenitic Stainless Steel Pipe.

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ASTM A ASTM SA Duplex Steel Seamless Tubing Tubes India – Citizen Metals

It should be recognized that asmt techniques should be employed to detect differently oriented imperfections. The holes shall be drilled radially and completely through the pipe wall, with care being taken to avoid distortion of the pipe while drilling. Materials and Manufacture 6. Pipe shall be double welded by processes employing filler metal in all passes and shall be completely radiographed.

The width of the notch shall not exceed twice the depth. NOTE 2—This value applies when the inch-pound designation of this specication is the basis of purchase. Optional supplementary requirements are provided for pipe when a greater ast of testing is desired.

These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures. When the M designation of this specication is the basis of purchase, the corresponding metric value s shall be agreed upon between the manufacturer and purchaser.

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in z790 standard.


Etching tests shall be made on a cross section from one end or both ends of each pipe and shall show sound and reasonably uniform material free of injurious laminations, cracks, and similar objectionable defects. Pipe having other dimensions may be furnished provided such pipe complies astn all other requirements of this specication. Subject to agreement between the purchaser and manufacturer, retest and retreatment provisions of these supplementary requirements may also be modied.

UNS s Pipes Tubes. Workmanship, Finish, and Appearance asfm High quality exotic piping products from approved manufacturers: Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides.

But all pipe tested since the last acceptable standardization must be retested for acceptance.

ASTM A790 Standard for Duplex Stainless Steel Pipe

Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification. The ductility of the weld shall be considered acceptable when there is no evidence of cracks in the weld or between the weld and the base metal after bending. Home Contact Us Back to Top. Single-seam, single- or double- welded austenitic pipe for high temperature and general corrosive asrm. Within the text, the SI units are shown in brackets.

These supplementary requirements call for additional tests to be made and, when desired, one or more of these may be specified in the order. Duplex Steel Flangesand Grades. To be accepted, retested pipe shall meet the test requirement.

Tensile and Hardness Requirements. The values stated in each system are not exact equivalents; therefore, each system must be used independently of a90 other.


ASTM A790 Seamless and Welded Pipe

Our products go through appropriate testing, both in Government and private laboratories. Duplex stainless steel plate is often used for storage tanks. If the equipment contains a reject notice lter setting, this shall remain off during calibration and testing unless linearity can be demonstrated at that setting.

Duplex Steel Sheet Plates Manufacturers This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.

Seamless austenitic pipe for high temperature applications. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

Heat analysis shall ast made to determine ast, percentages of the elements specified. Combining values from the two systems may result in nonconformance with the specification.

The hole diameter shall vary with NPS as follows: Tension tests shall be made on specimens from 2 pipes for lots of more than pipes.

Duplex Steel Tubing Supplied to. The inch-pound units shall apply unless the M designation of this specification is specified in the order.

It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.

Originally approved in