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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Duplex Steel and Pipe. Within w790 text, the SI units are shown in brackets. Within the text, the SI units are shown in brackets.

NOTE 1—The dimensionless designator NPS nominal pipe size has been substituted in this standard for such traditional terms as nominal diameter, size, and nominal size. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.

ASTM A Seamless Pipe, ASTM A Welded Pipe, ASTM AM Duplex Pipes.

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by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. This resistance is extremely important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications.

The high chromium, molybdenum and nitrogen contents of provide corrosion resistance superior to common stainless steels, such as, L and L in most environments and Citizen Metals has been actively involved in ensuring the best quality of the same to our clients.

Subject to agreement between the purchaser and s790, retest and retreatment provisions asgm these supplementary requirements may also be modied.

Typically only pipe up to 8 inch is produced to this specification. For seamless pipe, as an alternate to nal heat treatment in a continuous furnace or batch-type furnace, immediately following hot forming while the temperature of the pipes is not less than the satm minimum solution treatment temperature, pipes may be individually quenched in water a7790 rapidly cooled by other means.

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Heat analysis shall be made to determine the percentages of the elements specified. Link to Active This link will always route to the current Active version of the standard. Home Contact Us Back to Top.

Mechanical Tests Required To be accepted, a repaired pipe must pass the same non-destructive test by which it was rejected, and it must meet the minimum wall thickness requirements of this specication. We also provide Standard certificates like EN 3. If a specimen from any length shows objectionable defects, the length shall be rejected, subject to removal of the defective end and subsequent retests indicating the remainder of the length to be sound and reasonably uniform material.

A superscript epsilon e indicates an editorial change since the last revision or reapproval. If this supplementary requirement is specied, the number of tests per pipe shall also be specied. Duplex Steel Tubing Supplied to.

Extended elevated temperature exposure can embrittle stainless. The pipe shall be made by the seamless or an automatic welding process, with no addition of filler metal in the welding operation. The width of the notch shall not exceed twice the depth. The dimensionless designator Nominal Pipe Size nominal pipe size has been substituted in this standard for such traditional terms as nominal diameter, size, and nominal size.

If a specimen from any length of pipe fails because of a zstm of soundness that length shall be rejected, unless subsequent retesting indicates that the remaining length is sound.

The methods used for cleaning and preparing the surfaces for examination shall not be detrimental to the base metal or the surface nish. Short lengths are acceptable w790 the number and minimum length shall be agreed upon between the manufacturer and the purchaser.

Tension tests shall be made on specimens from 2 pipes for lots of more than pipes.

ASTM A790 Seamless and Welded Pipe

The pipe shall be made by the seamless or an automatic welding process, with no addition of filler metal in the welding operation. The holes shall be drilled radially and completely through the pipe wall, with care being taken to avoid distortion of the pipe while drilling.

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Unless specically called out by the purchaser, the selection of the nondestructive electric test will be at the option of the manufacturer. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification. Thus, even third party inspection consolidates our claims about superior quality. Link to Active This link will always route to the current Active version of asgm standard. The area a709 the signal may be reexamined.

The Class Number dictates how the pipe is welded and what non-destructive tests:. The inch-pound units shall apply unless the M designation of this zstm is specified in the order. The values stated in each system may not be exact equivalents; 7a90, each system shall be used independently of the other.

A number in parentheses indicates the year of last reapproval.

The primary reason for this is the priority that we give to complete satisfaction of the customer. The inch-pound units shall apply unless the M designation of this specification is specified in the order.

ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

ASTM A790 Standard for Duplex Stainless Steel Pipe

ASTM International asfm no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. It appears that you have disabled your Javascript.

Tensile and Hardness Requirements. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.