ASTM A105 Standard Specification

A105 is the Standard Specification for Forgings for Piping and fittings Applications.

1.1 This specification covers forged carbon steel piping components for ambient- and higher- service in pressure systems. Included are flanges, fittings, Valves, and similar parts ordered either to dimensions specified by the purchaser or to dimensional standards such as the MSS, , and API specifications referenced in Section. Forgings made to this specification are limited to a maximum weight of 10000 lb [4540 kg]. Larger forgings may be ordered to Specification A 266/A 266M. Tubesheets and hollow cylindrical forgings for pressure vessel shells are not included within the scope of this specification. Although this specification covers some piping components machined from rolled bar and seamless tubular products (see), it does not cover raw produced in these product forms.
1.2 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.
1.3 Specification A 266/A 266M covers other steel forgings and Specifications A 675/A 675M and A 696 cover other steel bars.
1.4 This specification is expressed in both inch-pound units and SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.5 The values stated in either inch-pound units or SI are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
Note 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter”, “size”, “and nominal size”.

Referenced Documents

  • A266/A266M Specification for Carbon Steel Forgings for Pressure Vessel Components
  • A370 Test Methods and Definitions for Mechanical Testing of Steel Products
  • A675/A675M Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality, Mechanical Properties
  • A696 Specification for Steel Bars, Carbon, Hot-Wrought or Cold-Finished, Special Quality, for Pressure Piping Components
  • A788 Specification for Steel Forgings, General Requirements
  • A961 Specification for Common Requirements for Steel Flanges, , Valves, and Parts for Piping Applications
  • API-600 Flanged and Butt-Welding-End Steel Gate Valves
  • API-602 Compact Design Carbon Steel Gate Valves for Refinery Use
  • B16.10 Face-to-Face and End-to-End Dimensions of Ferrous Valves
  • B16.11 Forged Steel Fittings, Socket Weld, and Threaded
  • B16.34 Valves-Flanged, Threaded and Welding End
  • B16.47 Large Diameter Steel Flanges
  • B16.5 Dimensional Standards for Steel and Flanged Fittings
  • B16.9 Wrought Steel
  • Section IX Welding Qualifications
  • SP44 Standard for Line Flanges
Chemical Requirements ASTM A105
Element Composition, %
Carbon 0.35 max
Manganese 0.60-1.05
Phosphorus 0.035 max
Sulfur 0.040 max
Silicon 0.10-0.35
Copper 0.40 max (1)
Nickel 0.40 max (1)
Chromium 0.30 max (1-2)
Molybdenum 0.12 max (1-2)
Vanadium 0.08 max
(1) The sum of copper, nickel, chromium, molybdenum and vanadium shall not exceed 1.00%.
(2) The sum of chromium and molybdenum shall not exceed 0.32%.
For each reduction of 0.01% below the specified carbon maximum (0.35%), an increase of 0.06% manganese above the specified maximum (1.05%) will be permitted up to a maximum of 1.35%.

Mechanical Properties
Tensile 70 ksi, min
Yield, note A 36 ksi, min
Elongation in 2in, Basic minimum for wall 5/16″ and over, strip test 30%
Hardness 187 HBW max
Note A – Determined by either the 0.2% offset method or the 0.5% extension-under-load method. Other test methods available as listed in A105.
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