Chemical composition and mechanical properties of Chinese pressure vessel steel 12Cr1MoVR
12Cr1MoVR 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
12Cr1MoVR 0.08~0.15 0.15~0.40 0.40~0.70 ≤0.30 ≤0.30 0.90~1.20 0.25~0.35 　 0.15~0.30 　 　 ≤0.025 ≤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 strength Impact test 180 °Bending test b=2a
Tensile strength Rm/MPa Lower yield strength ReL/MPa Elongation after fracture A/% Temperature/℃ Impact absorption energy KV2/J
≥ 　 ≥
12Cr1MoVR Normalizing+Tempering 6～60 440～590 245 19 20 47 D=3a
>60～100 430～580 235

Note: D is the diameter of the bending indenter; b is the width of the sample; a is the thickness of the sample.                                
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,≥
12Cr1MoVR >20～100 220 210 200 190 176 167 157 150 142

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