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What is the difference between 20MnMoNi55 and 20MnMoR steel plate

20MnMoNi55 and 20MnMoR steel plates are for boilers and pressure vessels. The delivery status of 20MnMoNi55 steel plate: normalizing + tempering, quenching and tempering (Q+T), mainly used for the production of methanol synthesis tower. The delivery status of 20MnMoR steel plate: normalized + tempered (NT), mainly used in the production of tube sheet of the reactor.

Smelting analysis of chemical composition of 20MnMoNi55 steel plate and 20MnMoR steel plate:

Grade C Si Mn P S Cr Ni Mo Al Cu V Ti Sn As N
22MnMoNi55 0.15-0.25 0.10-0.35 1.15-1.55 ≤0.015 ≤0.012 ≤0.2 0.45-0.85 0.40-0.55 0.01-0.05 ≤0.15 ≤0.02 ≤0.03 ≤0.011 ≤0.025 ≤0.013
20MnMoR 0.17-0.23 0.17-0.37 1.10-1.40 ≤0.025 ≤0.010 ≤0.30 ≤0.300 0.20-0.35 ≤0.25 ≤0.25 ≤0.02 ≤0.03 ≤0.011 ≤0.025 ≤0.013

Note: (1) N is the finished product analysis, Sn is the provided value
(2) 20MnMo-R requires Ceq≤0.50%. Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15

Mechanical properties of 20MnMoNi55 steel plate and 20MnMoR steel plate:

Grade Delivery status Room temperature stretch 300 stretch AKV 180°
cold bending
Re(MPa) Rm(MPa) A(%) Rp0.2(MPa) (room temperature, J) d=3.5a
22MnMoNi55 N+T ≥450 570-740 ≥18 ≥390 Average≥40 In good condition
Q+T 590-760 Single value≥34
20MnMoR N+T ≥370 530-680 ≥18 - ≥34 -
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