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Q: Our piping specification requires that duplex stainless-steel castings be supplied per ASTM A A valve company took exception, and indicated that duplex. CD3MN; 4A. Cast UNS: J Cast Grade: CD3MN; 4A. Cast ASTM: A, A, 4A (CENT, INVEST, SAND). Wrought UNS: S Wrought Grade: 26 Sep Heat treatment can modify the corrosion resistance of stainless steels. Thus, the corrosion behavior of ASTM A/A M GR 5A super duplex.

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Duplex Stainless Steels

Certification must be astm a890 listing the chemical analysis of the heat and the mechanical property test results. Proper heat treatment of these alloys is usually necessary to astm a890 corrosion resistance and in some cases to meet mechanical properties. Any casting that meets A also meets A Combining values from the two systems may result in nonconformance with the standard.

However, one thing is clear-materials are not added in these codes unless the parent specification requires tensile testing to ensure that the product being supplied astm a890 meets the minimum mechanical properties upon which the design is based.

What You Need to Know in The Magic Behind the Metal Post: Explosion-Proof Astm a890 Speed Actuators. Ensuring Pipeline Valve and Actuator Integrity.

Each heat of material must be tensile tested. Latest Post Popular Links Events. Castings shall be marked for material identification with the specification astm a890 and grade.

Work Item s – astm a890 revisions of this standard. The Evolution of Control Valve Diagnostics. Each casting axtm be marked with a heat number or with a serial number traceable to a heat number. Marking of heat numbers astm a890 castings is not required unless specified separately on the purchase order. Historical Version s – view previous astm a890 of standard.


A only requires post-weld heat treatment if Supplementary Requirement S33 is imposed on the purchase order. For this reason alone, many specifications that don’t require actual tensile testing are not asrm in these codes.

Duplex Stainless Steels │ Alloy Guide │ MetalTek

However, A imposes some additional requirements:. Referenced Documents purchase astm a890 The documents listed below are referenced within the subject standard but are not provided as part of the astm a890. This abstract is a brief summary of the referenced standard. Castings astm a890 be heat treated asrm accordance with the required procedure and heat-treat temperature. The values stated in each system may not be exact equivalents; therefore, asgm system shall be used independently of the other.

A imposes several other requirements that are not included sstm A nor A A valve company took exception, and indicated that duplex valve bodies and bonnets would be supplied per ASTM A Commercial, Industrial Activity Post: ASTM A lists tensile property requirements, but does not require that the tensile tests actually be performed.

Link to Active This link will always astm a890 to the current Active version of the standard. What is the difference between these specifications?

Each casting must be hydrostatically tested. ASTM does not astm a890 any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Materials Q&A

The steel shall conform to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, copper, tungsten, and nitrogen. New Astm a890 for Durable Goods Up 1.


In order to obtain a test report showing the actual chemistry and tensile test results, Supplementary Requirement S12 must also be imposed.

Using Data to Run our Plants Post: It astm a890 the responsibility of the purchaser to determine which astm a890 shall be furnished depending on design and service conditions, mechanical properties, and corrosion-resistant characteristics. ASTM A was reapproved without changes in The material may be adopted in ASME codes for ashm products or applications, including: A provides a definition for major weld repairs and requires post-weld heat treatment i.

A grades will not be added for the same reason. Upcoming Valve Industry Events Reprints. Minimum heat-treat temperatures are specified; however, it is sometimes necessary to heat-treat at astm a890 temperatures, hold for some minimum time at temperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet the required mechanical properties.

Tensile tests are only required if Supplementary Requirement S32 is specified on the purchase order. It is informational only and not an official part of the standard; the full text of the standard itself must be asgm to for its use and application.

As such, many piping specifications include references astm a890 ASTM A astm a890 its various duplex grades for piping components such as valves. Updated Expertune PlantTriage Post: However, A imposes some additional requirements: Looking for a career in the Valve Industry?