Chemical composition and mechanical properties of Chinese pressure vessel steel 07Cr2AlMoR
07Cr2AlMoR 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
07Cr2A1MoR ≤
0.09		 0.20~0.50 0.40~0.90 ≤
0.30		 ≤
0.30		 2.00
2.40		 0.30
0.50		 　 　 　 0.30
0.50		 ≤
0.020		 ≤
0.010		 　

7.1.5   According to the customer's requirements, an appropriate amount of rare earth elements can be added to 07Cr2AlMoR steel.
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 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
≥ 　 ≥
07Cr2AlMoR Normalizing+Tempering 6～36 420～580 260 21 20 47 D=3a
>36～60 410～570 250

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 Rpo,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,≥
07Cr2AlMoR >20～60 215 205 195 185 175 　 　 　 —

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