ASTM A105 - material inspection

Order information

  • Quantity,
  • Size and pressure class or dimensions, (tolerances and surface finishes should be included),
  • Specification number with grade or class, or both, as applicable, and year/date,
  • Supplementary requirements, and
  • Additional requirements.


Who make a production/shape.
Product markings: company name or logo or trade-marks.

Trace number

A heat number, ladder number (L), cast number declared in the MTC.

The trace number is traceability to all the test results such as chemical analysis results, mechanical test results, etc.

The marking code also accept in the MTC by process manufacturer which they assigned another making code under company quality manual control.

Product markings: heat number or cast number.


A material specification includes grade, year of edition.

Product markings: specifications number and grade

Dimensions and tolerance

Forming: ASME B16.11 or ASME B16.5, or other standards.

Identification marking acc. to ASME B16.11 or ASME B16.5.

Mechanical properties

The material shall conform to the mechanical property requirements prescribed in Table 2 and Table 3 are tensile strength, yield strength and percentage of elongation, hardness value.

Tensile strength: min. 70 000 psi;

Yield strength (0.2% or 0.5% offset): min. 36 000 psi;

Elongation (standard specimen): 22%

Elongation (trip specimen): 30% and refer to ASTM A105 table 3.

Hardness: max. 187 HB

NOTE: ASTM A105 is P-No. 1 and Gr-No. 2

Chemical analysis

Heat analysis and/or product analysis. Some MTC stated heat analysis (H) and/or product analysis § refer to ASTM A105 table 1.Tolerance refer to ASTM A961.

C = max. 0.35 % (see general note);

Mn = 0.6 - 1.05 % (max. 1.35 see general note);

P = max. 0.035%;

P = max. 0.040%;

Si = 0.1 - 0.35%;

Cu = max. 0.4%;

Ni = max. 0.4 % ;

Cr = max. 0.3 %;

Mo = max. 0.12 %;

V = max. 0.08 %;

Please don’t forget general note and note 1, note 2 in the table 1.

Product markings: heat number or heat code.

Heat treatment

Heat treatment is a mandatory requirement of class above 300 or special design. Material shall subject to annealing, normalizing, or normalizing and tempering or quenching and tempering.

This depend on the applicable specification and heat treatment, most flange, fitting and flanged fitting normally subject to normalize at 920 deg. C, then slow cooling in still air.

Normalizing as marked “N”, such as ASTM A105N.

Product markings: not required


Such tests shall be conducted by the forging manufacturer only when supplementary requirement S8 in specification A 961 is specified.


The supplementary requirements shall apply only when specified by the purchaser in the inquiry, contract, and order such as CE%, hardness, heat treatment, etc.