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

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

≤0.02

≤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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