ASTM A-105/A-105M – Material inspection and review MTC

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.

Manufacture

Who is finished to size or shape.

Product marking is company name, logo or trade-marks (example M.E.G.A or Uluma).

Trace number

Also called 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 marking is heat number or cast number (example 1172HB)

Specifications

A material specification, in the MTC should have year of edition.

Product markings is specifications number (ASTM A105)

Dimensions and tolerance

Forged fittings are accordance to ASME B16.11.

Flange and flanged fittings are are accordance to ASME B16.5.

Learn more: identification marking acc. to ASME B16.11 and 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

Chemical analysis

Heat analysis and/or product analysis. Some MTC stated heat analysis (H) and/or product analysis (P) 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 marking is 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 marking is not required

Learn more: inspection material compliance with NACE MR0175

Hydrotest

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

Supplementary

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

Nguyen Duy Bien
 

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