API STD 6A718-2009 pdf download.Nickel Base Alloy 718 (UNS N07718) for Oil and Gas Drilling and Production Equipment.
1 Scope 1.1 Purpose This document provides requirements for Nickel Base Alloy 718 (UNS N07718) that are intended to supplement the existing requirements of API 6A and ISO 10423. These additional requirements include detailed process control requirements and detailed testing requirements. The purpose of these additional requirements is to ensure that the Nickel Base Alloy 718 used in the manufacture of API 6A or ISO 10423 pressure-containing and pressure-controlling components is not embrittled by the presence of an excessive level of deleterious phases. 1.2 Applicability This standard is intended to apply to pressure containing and pressure controlling components covered by API 6A and ISO 10423, but is not invoked by API 6A and ISO 10423. This standard is applicable when invoked by the equipment manufacturer or the equipment purchaser. 2 Normative References The following normative documents contain provisions that, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document applies. Members of ISO and IEC maintain registers of currently valid standards. API Specification 6A, Specification for Wellhead and Christmas Tree Equipment ASTM A370 1 , Standard Test Methods and Definitions for Mechanical Testing of Steel Products ASTM A604, Standard Test Method for Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets ASTM B880, General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys ASTM E10, Standard Test Method for Brinell Hardness Test of Metallic Materials
220.127.116.11 Chemical Composition Frequency and Test Methods The chemical composition shall be tested on a remelt ingot basis on product representative of a remelt ingot per ASTM E354, ASTM E1473, or a nationally or internationally recognized industry standard. 18.104.22.168 Check (Product) Analysis When material is qualified by the use of a check (product) analysis performed on either the test coupon or a non- critical area of the production material, the analysis shall conform to the check (product) analysis variation specified in ASTM B880. 4.1.2 Melt Practice Requirements 22.214.171.124 Acceptable Melt Practices The alloy shall be melted by one of the following sequences of processes. a) Step 1—Basic electric furnace (EF). Step 2—Either argon oxygen decarburization (AOD) or vacuum oxygen decarburization (VOD). Step 3—Vacuum arc remelting (VAR). Step 4—Additional VAR.
4.1.3 Forging and Hot Working Requirements—Hot Work Reduction Ratio The minimum total hot work reduction ratio shall be 4:1. 4.1.4 Heat Treating Requirements 126.96.36.199 Heat Treating Equipment Qualification and Calibration The practice for qualification of heat-treating equipment shall be per the API 6A annex for qualification of heat-treating equipment or another internationally recognized standard. Furnaces shall be calibrated no less than once a year or when a furnace is moved, repaired or rebuilt. When the API 6A annex for qualification of heat-treating equipment is selected as the basis for furnace calibration, the requirements of the API 6A annex shall be treated as normative. 188.8.131.52 Temperature Monitoring The material temperature shall be measured by use of either a contact surface thermocouple or a heat sink as described in API 6A or ISO 10423. The hold time shall not commence until the contact surface thermocouple or a heat sink reaches at least the minimum required material temperature. The material manufacturer or material supplier shall maintain copies of the heat treating charts showing the material temperature as measured by the contact surface thermocouple or heat sink for five years minimum following the date of heat treatment.