Chemical composition and mechanical properties of Chinese pressure vessel steel 12Cr2Mo1R
12Cr2Mo1R Approximate Grade Lookup Table

Table 1  Chemical Composition

Grade Chemical Composition(Quality Fraction)/%
C Si Mn Cu Ni Cr Mo Nb V Ti Altb P S Others
12Cr2Mo1R 0.08~0.15 ≤0.50 0.30~0.60 ≤0.20 ≤0.30 2.00~2.50 0.90~1.10 　 　 　 　 ≤0.020 ≤0.010 　

7.1.6 The content of residual elements chromium, nickel, and copper should not exceed 0.30% each, and molybdenum should not exceed 0.080%, with the total content of these elements not exceeding 0.70%. Analysis is not required if the supplier can guarantee this.
7.1.8  The permissible deviation of the chemical composition of finished steel products shall comply with the provisions of CB/T 713.1.
7.1.9  For a comparison of similar grades with relevant international standards, please refer to Appendix A.

Table 2  Mechanical properties and processing properties

Grade Delivery status Thickness mm Tensile test Impact 180°Bending test b=2a
Tensile strengthRm/MPa Lower yield strengthReL/MPa Elongation after fractureA/% Temperature/℃ Impact absorption energy KV2/J
≥ 　 ≥
12Cr2MolR Normalizing+Tempering 6～200 520～680 310 19 20 47 D=3a

Note: D is the diameter of the bending indenter; b is the width of the specimen; a is the thickness of the specimen. When the yielding phenomenon is not obvious, the specified plastic elongation strength Rp0.2 can be used instead.

Table 3  High temperature mechanical properties

Grade Thickness/mm Test temperature/℃
100 150 200 250 300 350 400 450 500
ReLᵃ( or Rp0.2)/MPa,≥
12Cr2MolR >20～200 280 270 260 255 250 245 240 230 215

ᵃ When the yielding phenomenon is not obvious, the specified plastic elongation strength Rp0.2 can be used instead.