Chemical composition and mechanical properties of Chinese pressure vessel steel 14Cr1MoR
14Cr1MoR 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
14Cr1MoR ≤0.17 0.50~0.80 0.40~0.65 ≤0.30 ≤0.30 1.15~1.50 0.45~0.65 　 　 　 　 ≤0.020 ≤0.010  

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.
The permissible deviation of the chemical composition of finished steel products shall comply with the provisions of CB/T 713.1.
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 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
≥ 　 ≥
14CrlMoR Normalizing+Tempering 6～100 520～680 310 19 20 47 D=3a
>100～200 510～670 300

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,≥
14CrlMoR >20～200 280 270 255 245 230 220 210 195 176

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