Qhov sib txawv ntawm DNV E460 thiab DNV E550 steel phaj - Kev Paub

DNV E460 yog lub siab - lub zog steel phaj ntawv pov thawj los ntawm DNV (Det Norske Veritas) rau kev siv dej hiav txwv thiab sab nrauv. Qib "E" txhais tau hais tias nws tau raug kuaj ntawm -40 degree, nrog qhov cuam tshuam tsawg kawg nkaus ntawm 23 ft-lbs (kwv yees li 31J) longitudinally . Nws muaj qhov tsawg kawg nkaus lub zog ntawm 460 MPa (67 ksi) thiab lub zog tensile xws li 570 txog 720 MPa (83-105 ksi), nrog qhov tsawg kawg nkaus elongation ntawm 17%. Cov tshuaj muaj pes tsawg leeg yog tswj nruj me ntsis nrog cov pa roj carbon tsawg dua lossis sib npaug li 0.20% thiab manganese Tsawg dua lossis sib npaug li 1.70%. Qib no feem ntau yog muab rau hauv cov xwm txheej zoo li qub lossis TMCP. Nws yog dav siv rau kev tsim kho lub nkoj, cov chaw tawm sab nrauv, thiab cov txheej txheem marine ua haujlwm hauv qhov chaw txias.

DNV E550 yog ib qho ntxiv - siab - lub zog marine steel phaj kuj tau lees paub los ntawm DNV nrog rau kev cuam tshuam toughness kuaj ntawm -40℃. Lub "550" qhia txog qhov tsawg kawg nkaus lub zog ntawm 550 MPa thiab lub zog tensile xws li 670 txog 830 MPa, nrog qhov tsawg kawg nkaus elongation ntawm 16%. Kev cuam tshuam lub zog yuav tsum muaj tsawg kawg yog 37J (transverse) lossis 55J (ntev) ntawm -40 degree. Cov tshuaj muaj pes tsawg leeg muaj cov pa roj carbon tsawg dua lossis sib npaug li 0.20% thiab manganese Tsawg dua lossis sib npaug li 1.70%, nrog cov ntsiab lus microalloying suav nrog Nb, V, thiab Ti. Qib no yuav tsum tau ua tiav qib siab thiab feem ntau yog muab rau hauv quenched thiab tempered (QT) lossis TMCP cov xwm txheej. Nws yog tsim los rau kev xav tau cov khoom siv hauv nkoj tsim thiab offshore platforms xav tau lub zog zoo dua.

Ob leeg DNV E460 thiab DNV E550 yog DNV- ntawv pov thawj siab - lub zog marine steels nrog zoo heev qis - kub toughness kuaj ntawm -40 degree, kom ntseeg tau tias kev ua tau zoo nyob rau hauv hnyav marine ib puag ncig . Lawv qhov sib txawv tseem ceeb nyob hauv qib siab: E460 muaj qhov tsawg kawg nkaus lub zog ntawm 460 MPa nrog lub zog tensile ntawm 570-720 MPa, haum rau kev siv lub zog dav dav dav dav thiab cov qauv sab nrauv, thaum E550 muab qhov siab tshaj qhov siab tshaj tawm lub zog ntawm 550 MPa nrog tensile lub zog xav tau ntau tshaj-806 txog 3070 MPa. xav tau superior zog. Ob qib tshwj xeeb tswj cov tshuaj muaj pes tsawg leeg nrog cov pa roj carbon tsawg dua lossis sib npaug li 0.20% thiab manganese Tsawg dua lossis sib npaug li 1.70%, tab sis E550 feem ntau yuav tsum tau ua tiav ntau dua li QT lossis TMCP kom ua tiav nws cov khoom siv kho kom zoo thaum tuav cov khoom zoo rau kev pabcuam marine tseem ceeb.

Tshuaj muaj pes tsawg leeg

DNV E460 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
DNV E460	0.20	0.10-0.55	1.7	0.030	0.030	0.015-0.08	0.020
	Nb	V	Ti	Cu	B	Ni	Mo
	0.02-0.05	0.04-0.10	0.02		0.005

DNV E550 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
DNV E550	0.20	0.10-0.55	1.7	0.030	0.030	0.015-0.08	0.020
	Nb	V	Ti	Cu	B	Ni	Mo
	0.02-0.05	0.04-0.10	0.02		0.005

Mechanical Property

DNV E460 ntxiv cov khoom muaj zog dav dav
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Energy 1	Zog 2
DNV E460	mm	Min Mpa	Mpa	Tsawg%	-40	J	J
	t Tsawg dua lossis sib npaug li 50	460	570-720	17%		31	46
	50＜t Tsawg dua lossis sib npaug rau 70	460	570-720	17%		31	46
	70＜t Tsawg dua lossis sib npaug rau 150	460	570-720	17%		31	46
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev

DNV E550 ntxiv cov khoom muaj zog dav dav
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
DNV E550	mm	Min Mpa	Mpa	Tsawg%	-40	J	J
	t Tsawg dua lossis sib npaug li 50	550	670-830	16%		37	55
	50＜t Tsawg dua lossis sib npaug rau 70	550	670-830	16%		37	55
	70＜t Tsawg dua lossis sib npaug rau 150	550	670-830	16%		37	55
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev