Boiler quality 15Mo3 VS 16Mo3 pressure vessel steel plate

Boiler quality 15Mo3 steel was the designation in DIN 17155, replaced in 1993 by EN 10028-2. At the same time, the name was changed to 16Mo3, maintaining the steel number 1.5415. There are small differences in minimum values between boiler quality 15Mo3 and 16Mo3 pressure vessel steel plate.

Boiler quality 15Mo3 VS 16Mo3 pressure vessel steel plate in chemical composition:

Grade	C	Si	Mn	P	S	Cr	Cu	Mo	Ni	N
15Mo3	0.12-0.20	0.10-0.35	0.40-0.90	≦0.035	≦0.030	≦0.25	≦0.30		≦0.30
16Mo3	0.12-0.20	≦0.35	0.40-0.90	≦0.025	≦0.010	≦0.30	≦0.30	0.25-0.35	≦0.30	≦0.012

Boiler quality 15Mo3 VS 16Mo3 pressure vessel steel plate in mechanical properties:

Grade	Yield Strength	Tensile Strength	Elongation
Grade	(Mpa)	(MPa)	(%)
15Mo3	≧275	440-590	≧20
16Mo3	≧275	440-590	≧22

16Mo3 pressure vessel steel, designated with steel number 1.5415, is an European (DIN EN) steel grade for alloy steels. 16Mo3 pressure vessel steel plate is Cr-Mo alloy steel. The addition of molybdenum (Mo) not only improves the resistance of 16Mo3 pressure vessel steel plate to pitting corrosion, but also significantly enhances creep strength of 16Mo3 pressure vessel steel plate at elevated temperatures. The chromium(Cr) improves the resistance of 16Mo3 pressure vessel steel plate to high-temperature hydrogen attack and graphitization.

The main pressure vessel steel standards and grades of BBN steel are A202, A203, A204, A285, A299, A302, A387, A515, A516, A517, A533, A537, A612, A662, A841;
EN10028-2 P235GH P265GH P295GH P355GH 16Mo3;
EN10028-3 P275NH P275NL1 P275NL2 P355N P355NH P355NL1 P355NL2 P460NH P460NL1 P460NL2;
EN10028-5 P355M P355ML1 P355ML2 P420M P420ML1 P420ML2 P460M P460ML1 P460ML2;
EN10028-6 P355Q P355QH P355QL1 P355QL2 P460Q P460QH P460QL1 P460QL2 P500Q P500QH P500QL1 P500QL2 P690Q P690QH P690QL1 P690QL2;
JIS G3115 SPV235 SPV315 SPV355 SPV410 SPV450 SPV490;
JIS G3103 SB410 SB450 SB480 SB450M SB480M;
GB713 Q245R Q345R Q370R 18MnMoNbR 15CrMoR 14Cr1MoR 13MnNiMoR 12Cr2Mo1R 12Cr1MoVR;
GB3531 16MnDR 15MnNiDR 09MnNiDR;
DIN17155 HI HII 17Mn4 19Mn6 15Mo3 13CrMo44 10CrMo9-10 and so on.

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