Yield Strength

Definition(s)


Yield strength

Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.

  • NOTE: 1 The term is expressed in Newton’s per square millimeter (pounds per square inch) of loaded area.
  • NOTE: 2 All yield strength (YS) specified in this standard are considered as being the 0.2 % yield offset strength in accordance with ISO 6892 or ASTM A370.

Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

Yield strength

Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.

  • NOTE: 1 The term is expressed in newtons per square millimeter (pounds per square inch) of loaded area.
  • NOTE: 2 All yield strengths specified in this standard are considered as being the 0.2 % yield offset strength in accordance with ISO 6892 or ASTM A370.

Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards

Yield strength

Material specification corresponding to measured tensile stress required to produce a total elongation of 0.5 % of test specimen gauge length.

Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Yield strength

Stress level, measured at room temperature, at which material plastically deforms and does not return to its original dimensions when the load is released.

  • NOTE: All yield strengths specified in this document are the 0,2 % offset yield strength in accordance with ISO 6892-1 or ASTM A370.

Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards

 

Yield strength

Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.

  • NOTE: 1 It is expressed in newtons per square millimetre (pounds per square inch) of loaded area.
  • NOTE: 2 All yield strengths specified in this American National Standard are considered as being the 0,2 % yield offset strength in accordance with ISO 6892.

Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards

 

Yield strength

The stress level measured at room temperature, expressed in pounds per square inch of loaded area, at which material plastically deforms and will not return to its original dimensions when the load is released. Yield strengths specified in this standard shall be considered as being the 0.2% yield offset strength per ASTM A 370.

Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards

 

Yield strength

The stress level measured at room temperature, expressed in pounds per square in. of loaded area, at which material plastically deforms and will not return to its original dimensions when the load is released. All yield strengths specified in this standard shall be considered as being the 0.2% yield offset strength per ASTM A 370.

Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards

 

Yield strength

Stress level at which a metal or other material ceases to behave elastically.

Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global Standards

 

Yield strength

Engineering stress at which, by convention, it is considered that plastic elongation of the material has commenced (ASTM E6). NOTE This stress may be specified in terms of: a) a specified deviation from a linear stress–strain relationship, b) a specified total extension attained, or c) maximum or minimum engineering stresses measured during discontinuous yielding. EXAMPLE In API 6A, yield strength values are the 0.2 % offset yield strengths determined from tests conducted in accordance with ASTM A370. In API 5CT, the stress occurs at specified strains (0.5 %, 0.65 %, etc.).

Source: API TR 1PER15K-1, Protocol for Verification and Validation of High-pressure High-temperature Equipment, First Edition, March 2013. Global Standards