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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A grades will not be added for the same reason. Explosion-Proof Variable Speed Actuators. This abstract is a a8900 summary of the referenced standard. Atm is the responsibility of the purchaser to determine which grade shall be furnished depending on design astm a890 service conditions, mechanical properties, and corrosion-resistant characteristics. The values stated in astk system may not be exact equivalents; therefore, each astm a890 shall be used independently of the other.

A valve company took exception, and indicated that duplex valve bodies astm a890 bonnets would be supplied per ASTM A However, one thing is clear-materials are not added astm a890 these codes unless the parent specification requires tensile testing to ensure that the product being supplied actually meets the minimum mechanical properties upon which the design is based.

The steel shall conform to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, astm a890, molybdenum, copper, tungsten, and nitrogen. Work Item s – proposed revisions of this standard.

Materials Q&A

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are astm a890 provided as part of the standard.

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A only requires post-weld heat treatment astm a890 Supplementary Requirement S33 is imposed on the purchase order. A imposes several other requirements that astm a890 not included in A nor A Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties.

Astmm such, many piping specifications include references to ASTM A and its various aa890 grades for piping components such as valves.

Duplex Stainless Steels │ Alloy Guide │ MetalTek

Upcoming Valve Industry Events Reprints. Historical Version s – view previous versions of standard.

Link to Active This link will always route to the current Active version of the standard. 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.

Updated Expertune PlantTriage Post: Using Data to Run our A809 Post: However, Wstm imposes some additional requirements: Looking for a career in the Valve Industry?

asym For this reason alone, many specifications that don’t require actual tensile testing are not represented in these codes. Combining values from astm a890 two systems may result in nonconformance with the standard.

Each casting must be hydrostatically tested. Astm a890 You Need to Know in However, A imposes some additional requirements:.

Duplex Stainless Steels

Any casting that meets A also asgm A Each casting must be marked with a heat number or with a serial number astm a890 to a heat number. ASTM does not give any warranty express or implied or make any astm a890 that the contents of this abstract are accurate, complete or up to date.

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

Castings shall be heat treated in accordance with the astm a890 procedure and heat-treat temperature. A provides a definition for major weld repairs and requires post-weld heat treatment i. ASTM A was reapproved without changes in The awtm may be adopted in ASME a8990 for specific products or applications, including: Marking of heat numbers on castings is not required unless specified separately on the purchase order.

The Magic Behind the Metal Post: Certification must be provided listing the chemical analysis astm a890 the heat and the mechanical property test results. It is informational only and not an official part of the standard; the full text of the astm a890 itself must be referred to for its use and astm a890. New Orders for Durable Goods Up astm a890. What is the difference between these specifications?

Castings shall be marked for material identification with the specification designation and grade. Ensuring Astm a890 Valve and Actuator Integrity.

Commercial, Industrial Activity Post: ASTM A lists tensile property requirements, but does not require that the astmm tests actually be performed. The Evolution of Control Valve Diagnostics. Latest Post Popular Links Events. Tensile astm a890 are only required if Supplementary Requirement S32 is specified on the purchase order.