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

API STANDARD 20C

SECOND EDITION, NOVEMBER 2015 EFFECTIVE DATE: NOVEMBER 1, 2016

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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. Qualification 6

   1. General 6

   2. Qualification Forging 6

   3. Qualification Forging Evaluation 7

   4. Limits of Forging Qualifications 10

   5. Records of Qualification 11

5. Production Forgings 13

   1. Qualification of Procurement Sources for Starting Material 13

   2. Material Specifications 14

   3. Manufacturing Process Specification (MPS) 14

   4. Process Control Parameters 14

   5. Forging Production 15

   6. Inspection, Quality Control, Marking, and Documentation 15

   7. Repair Welding 16

   8. Traceability 16

   9. Marking 16

   10. Records Type and Retention 17

   11. Handling, Storage, and Shipping 17

6. Facility Requirements 17

   1. Minimum Facility Requirements for the Forging Manufacturer 17

   2. Activities Applicable to a Forging Manufacturer 17

Annex A Use of the API Monogram by Licensees 19

Tables

1. Material Groups 6

2. As-forged Weight Range Classes (weight in pounds) 7

3. ASTM E45 Method A Inclusion Rating Limits 9

4. Minimum Facility Requirements 18

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

1. Scope

   1. Purpose

      
      

      This API standard specifies requirements for the 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 different 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.

ASTM A3701, Standard Test Methods and Definitions for Mechanical Testing of Steel Products

ASTM A388/A388M, Standard Practice for Ultrasonic Examination of Steel Forgings

ASTM A604, Standard Practice for Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets

ASTM E10, Standard Test Method for Brinell Hardness Test of Metallic Materials ASTM E18, Standard Test Method for Rockwell Hardness Test 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 Method for Determining Average Grain Size

ASTM E165, Standard Practice for Liquid Penetrant Examination for General Industry

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

ASTM E428, Standard Practice for Fabrication and Control of Metal, Other than Aluminum, Reference Blocks Used in Ultrasonic Testing

ASTM E562, Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count

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

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