Closed Die Forgings for Use in the Petroleum and Natural Gas Industry

API SPECIFICATION 20C

FIRST EDITION, OCTOBER 2009 EFFECTIVE DATE: APRIL 1, 2010

ADDENDUM 1, JULY 2014

Closed Die Forgings for Use in the Petroleum and Natural Gas Industry

Upstream Segment

API SPECIFICATION 20C

FIRST EDITION, OCTOBER 2009 EFFECTIVE DATE: APRIL 1, 2010

ADDENDUM 1, JULY 2014

Special Notes

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Copyright © 2009 American Petroleum Institute

Foreword

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Contents

Page

1. Scope 1

   1. Purpose 1

   2. Applicability 1

   3. Forging Specification Levels (FSLs) 1

2. Normative References 1

3. Terms, Definitions, Acronyms, and Abbreviations 2

   1. Terms and Definitions 2

   2. Acronyms and Abbreviations 6

4. Limits of Forging Qualifications 6

   1. General 6

      4.2 FSL-1 7

      4.3 FSL-2 7

      4.4 FSL-3 8

      4.5 FSL-4 8

5. Forging Qualification Testing 8

   1. Qualification Sample Product 8

   2. Examination Procedure 8

   3. Mechanical Testing 9

   4. Metallographic Examination 9

   5. Acceptance of the Qualification Sample Product 10

   6. Records of Qualification 10

6. Production of Qualified Forgings 10

   1. Qualification of Procurement Sources for Starting Material 10

   2. Material Specifications 11

   3. Design and Maintenance of Forging Dies and Equipment 11

   4. Manufacturing Procedure Specification (MPS) 12

   5. Process Control Variables 12

   6. Forging Production 13

   7. Inspection, Quality Control, Marking, and Documentation 13

   8. Traceability 14

   9. Record Retention 15

   10. Handling, Storage, and Shipping 15

Annex A (informative) Use of the API Monogram by Licensees 16

Bibliography 20

Tables

1. Material Grades 7

2. As-forged Weight Range Classes 7

3. Modified JK Inclusion Rating Limits 10

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Closed Die Forgings for Use in the Petroleum and Natural Gas Industry

1. Scope

   1. Purpose

      
      

      This standard specifies requirements and gives recommendations for the design, qualification, and production of closed die forgings for use in API service components in the petroleum and natural gas industries when referenced by an applicable equipment standard or otherwise specified as a requirement for compliance.

      
      

   2. Applicability

      
      

      This standard is applicable to equipment used in the oil and natural gas industries where service conditions warrant the use of closed die forgings. Examples include pressure-containing or load-bearing components.

      
      

   3. Forging Specification Levels (FSLs)

      
      

      This standard establishes requirements for four FSLs. These FSL designations define different levels of forged product technical, quality, and qualification requirements.

      
      

2. Normative References

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

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 Practice for Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets

ASTM E10, Standard Test Method for Brinell Hardness of Metallic Materials ASTM E18, Standard Test Methods for Rockwell Hardness of Metallic Materials ASTM E45, Standard Test Method for Determining the Inclusion Content of Steel

ASTM E110, Standard Test Method for Indentation Hardness of Metallic Materials by Portable Hardness Testers

ASTM E112, Standard Test Methods for Determining Average Grain Size

ASTM E381, Standard Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings

ISO 2859-1 2, Sampling procedures for inspection by attributes—Part 1: Sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection

NCSL Z540.3 3, Requirements for the Calibration of Measuring and Test Equipment

1. ASTM International, 100 Barr Harbor Drive, West Conshohocken, Pennsylvania 19428, www.astm.org.

2. International Organization for Standardization, 1, ch. de la Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, www.iso.org.

3. NCSL International, 2995 Wilderness Place, Suite 107, Boulder, Colorado 80301-5404, www.ncsli.org.

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