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18MnMoNbR steel plate melting composition / yield tensile / impact performance

Posted:2021-08-18 11:05:07

1. The material 18MnMoNbR is steel plate for boilers and pressure vessels, and the implementation standard is GB713.

2. 18MnMoNbR steel plate chemical composition:

C	Si	Mn	P	S	Ni	Cr	Mo	Cu	Nb
≤0.22	0.15-0.5	1.2-1.6	≤0.025	≤0.02	≤0.3	≤0.3	0.45-0.65	≤0.3	0.025-0.05

3. 18MnMoNbR heat treatment method: normalizing and tempering.

4. 18MnMoNbR flaw detection standard NB/T47013.3

5. 18MnMoNbR steel plate mechanical properties:

Thickness	Heat treatment	Details
30-60mm	Normalizing, tempering	ReL(MPa)	≥440
		Rm(MPa)	590～740
		A5(%)	≥17
		Impact temperature	0
		Akv(J)	≥31	horizontal
		Bend diameter	3a
		Bending angle	180
		Performance description	Heat treatment: normalizing + tempering
60-100mm		ReL(MPa)	≥410
		Rm(MPa)	570～720
		A5(%)	≥17
		Impact temperature	0
		Akv(J)	≥31	horizontal
		Bend diameter	3a
		Bending angle	180
		Performance description	Heat treatment: normalizing + tempering

6. 18MnMoNbR steel plate: "18" is 0.18% carbon content, "Mn" indicates the composition contains a certain chemical element - manganese, "Mo" indicates the composition contains a certain chemical element - molybdenum, "Nb" means niobium, and "R" is letter of the vessel plate, which represents its purpose.