Qhov sib txawv ntawm DNV E620 thiab DNV E690 - Kev Paub

DNV E620 thiab DNV E690 yog ultra- siab- lub zog steel daim hlau cais los ntawm DNV (Det Norske Veritas), lub ntiaj teb kev ua dej hiav txwv thiab kev faib hluav taws xob thoob ntiaj teb. Cov qib no yog tsim los rau cov kev xav tau tshaj plaws nyob rau sab ntug dej hiav txwv thiab kev siv dej hiav txwv, xws li hnyav- nqa lub nkoj, cov qauv saum toj kawg nkaus rau cov ntug dej hiav txwv, thiab cov qauv tshwj xeeb Arctic. Lawv tau tsim los muab kev sib xyaw tshwj xeeb ntawm qhov kawg tensile lub zog, zoo toughness ntawm qhov kub thiab txias, thiab weldability, ua rau kev tsim kho ntawm cov qauv sib dua thiab ua haujlwm zoo dua.

Qhov txawv tseem ceeb:

Qhov sib txawv tseem ceeb yog lawv qhov tsawg kawg nkaus qhov kawg tensile zog (UTS). DNV E620 muaj UTS ntawm 620 MPa, thaum DNV E690 muaj ntau dua UTS ntawm 690 MPa. Lub ntsiab lus 'E' nyob rau hauv qib qhia txog qhov nce siab tawm los- rau- tensile ratio, uas yog qhov tseem ceeb rau cov qib no. Ob leeg yog quenched thiab tempered steels, tab sis ua kom tiav lub zog siab dua ntawm E690 yuav tsum muaj ntau yam meej thiab nruj alloy muaj pes tsawg leeg thiab cov txheej txheem kho cua sov.

Yog li ntawd, thaum ob qib xav tau kev tsim cov txheej txheem siab, DNV E690 feem ntau nthuav tawm cov teeb meem ntau dua. Nws xav tau kev tswj hwm nruj dua li cov txheej txheem vuam, suav nrog kev xaiv tshwj xeeb siab -toughness muab tub lim hlau, kev tswj xyuas meej ntawm preheating thiab interpass kub, thiab nruj ncej-weld heat treatment (PWHT) kom muaj kev ncaj ncees ntawm cov cua sov- thaj chaw cuam tshuam thiab tiv thaiv hydrogen{5}}assistist. Yog li ntawd, kev xaiv ntawm E620 thiab E690 suav nrog kev ntsuas qhov xav tau rau qhov kev ua haujlwm siab tshaj plaws thiab kev txuag lub cev hnyav (E690) tiv thaiv cov khoom ntawm cov khoom siv thiab cov khoom siv ntau dua.

Tshuaj muaj pes tsawg leeg

DNV E620 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
DNV E620	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 E690 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
DNV E690	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 E620 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 E620	mm	Min Mpa	Mpa	Tsawg%	-40	J	J
	t Tsawg dua lossis sib npaug li 50	620	720-890	15%		41	62
	50＜t Tsawg dua lossis sib npaug rau 70	620	720-890	15%		41	62
	70＜t Tsawg dua lossis sib npaug rau 150	620	720-890	15%		41	62
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev

DNV E690 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 E690	mm	Min Mpa	Mpa	Tsawg%	-40	J	J
	t Tsawg dua lossis sib npaug li 50	690	770-940	14%		46	69
	50＜t Tsawg dua lossis sib npaug rau 70	690	770-940	14%		46	69
	70＜t Tsawg dua lossis sib npaug rau 150	690	770-940	14%		46	69
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev