Killed Carbon Steels

[Peregrino7]

Killed Carbon Steels are usually specified for many vessels and heat Exchangers. ASME materials like SA-516 and SA-106 are killed (per ASME spec.)
Tubing and forging materials like SA-179 and SA-266 are not killed per Specification, so should I specify these materials should be killed??? Is it a usual practice??
Killed Carbon Steel is a process of deoxidation that is performed during the steel making process… Is it possible to specify an ASME Material to be killed, even if it is not per Specification ??

Thanks for your answer….


GH

 

[metengr]

The SA-266 Grades 1-4 are killed steels because of the required silicon additions as alloying elements per ASME SA 266 Table 1. Normally, ASME B&PV Code requires steels that have 0.24% or greater carbon contents to be killed (fully de-oxidized) using either Al or Si additions, and especially those steels that fall under a forging grade. For ASME SA-179, killed steels are not necessary because these steels are low carbon grade, low strength, are thin wall for easier expansion into tubesheets or headers and are normally specified for use in heat exchangers and condensers. You can specify killed steels for ASME SA-179, but this is not really necessary.

 

[Peregrino7]

Metengr,

May you please tell me where in ASME B&PV is indicated the requirement of steels that have 0.24% or greater carbon contents to be killed ???

Thanks a lot for your reply...!



GH

 

[metengr]

Peregrino7;
It is not stated in the Code, it is considered general practice. When ASTM Specifications are submitted and reviewed by the ASME Section II subcommittee, melting practice is carefully reviewed and either endorsed or revised. The ASME Specifications are considered minimum requirements.