Manufacturer

  • Product markings: company name or logo or trade-marks.

Trace number

  • Product markings: heat number or cast number.

Specifications

  • Product markings: specifications number and grade

Dimensions and tolerance

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 (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 %;

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

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