ASTM A105 Specification

Forgings, Fasteners, Boltings, Stud Bolts, Screws, Nuts


ASTM A105 specification covers forged carbon steel piping components for ambient- and higher-temperature 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, ASME, and API specifications referenced in Section 2. Forgings made to this specification are limited to a maximum weight of 10 000 lb [4540 kg]. Larger forgings may be ordered to Specification A266/A266M. 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 5.2), it does not cover raw material produced in these product forms.
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.
Specification A266/A266M covers other steel forgings and Specifications A675/A675M and A696 cover other steel bars.
ASTM A105 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. The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other Combining values from the two systems may result in nonconformance with the standard.

Related Specifications of ASTM A105

A181 A266 A350 A541 A694 A707 A727

ASTM A105 Chemical Composition

Element C Mn P S Si Cu Ni Cr Mo V
Composition, % 0.35 max 0.60-1.05 0.035 max 0.040 max 0.10-0.35 0.40 max A 0.40 max A 0.30 maxA ,B 0.12 max A ,B 0.08 max
  • (A) The sum of copper, nickel, chromium, molybdenum and vanadium shall not exceed 1.00 %.
    (B) The sum of chromium and molybdenum shall not exceed 0.32 %.

ASTM A105 Mechanical Requirements

Tensile strength, min, ksi [MPa] 70 [485]
Yield strength, min, ksi [MPa]B 36 [250]
Elongation in 2 in. or 50 mm, min, %:  
Basic minimum elongation for walls 5/16 in. [7.9 mm]
   and over in thickness, strip tests.
When standard round 2-in. or 50-mm gauge length or
    smaller proportionally sized specimen with the gauge
    length equal to 4D is used
For strip tests, a deduction for each 1/32-in. [0.8-mm]
   decrease in wall thickness below 5/16 in. [7.9 mm]
   from the basic minimum elongation
   of the percentage points of Table 3
Reduction of area, min, %D 30
Hardness, HBW, max 197
  • (A) For small forgings
    (B) Determined by either the 0.2 % offset method or the 0.5 % extension-under-load method.
    (C) See Table 3 for computed minimum values.
    (D) For round specimens only.

ASTM A105 Certifications

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103

ASTM A105 Supplementary Requirements

S1  Hardness 
S2  Heat Treatment 
S3  Marking Small Forgings 
S4  Carbon Equivalent