Qhov txawv ntawm LR DH50 thiab LR DH69 steel phaj - Kev Paub

LR DH50 yog ib qho ntxiv -siab- lub zog marine steel phaj ntawv pov thawj los ntawm Lloyd's Register (LR). Qhov kev xaiv "DH" qhia txog qib siab dua - lub zog muaj zog nrog kev cuam tshuam toughness kuaj ntawm -20℃. Nws muaj qhov tsawg kawg nkaus lub zog ntawm 500 MPa thiab tensile lub zog xws li 610 txog 770 MPa, nrog qhov tsawg kawg nkaus elongation ntawm 18% rau thicknesses txog 100 hli. Kev cuam tshuam lub zog yuav tsum muaj tsawg kawg yog 50J (ntev) lossis 33J (transverse) ntawm -20 degree. Cov tshuaj muaj pes tsawg leeg yog tswj hwm nruj nrog cov pa roj carbon tsawg dua lossis sib npaug li 0.20% thiab manganese Tsawg dua lossis sib npaug li 1.70%, muaj cov ntsiab lus microalloying suav nrog Nb, V, thiab Ti. Qib no feem ntau yog muab rau hauv cov xwm txheej zoo li qub lossis tswj tau dov thiab siv dav rau kev xav tau cov khoom siv hauv nkoj tsim thiab tawm ntug dej hiav txwv.

LR DH69 yog ib qho ultra-siab- lub zog marine steel phaj kuj tau lees paub los ntawm Lloyd's Register (LR) nrog rau kev cuam tshuam toughness kuaj ntawm -20℃. Lub "69" qhia txog qhov tsawg kawg nkaus tawm lub zog ntawm 690 MPa . Nws muaj lub zog tensile xws li 770 txog 940 MPa thiab qhov tsawg kawg nkaus elongation ntawm 16% rau thicknesses txog 100 hli. Kev cuam tshuam lub zog yuav tsum muaj tsawg kawg yog 69J (ntev) lossis 46J (transverse) ntawm -20℃. Cov tshuaj muaj pes tsawg leeg zoo ib yam li DH50 nrog carbon Tsawg dua lossis sib npaug li 0.20% thiab manganese Tsawg dua lossis sib npaug li 1.70%, nrog rau cov ntsiab lus microalloying. Qib no yog tsim los rau qhov xav tau tshaj plaws load-cov ntaub ntawv siv hauv kev tsim cov nkoj, ultra- cov nkoj loj, thiab cov qauv hauv ntug dej hiav txwv uas xav tau qhov siab tshaj plaws-rau-qhov hnyav piv.

Ob leeg LR DH50 thiab LR DH69 yog LR- ntawv pov thawj ntxiv - siab - lub zog marine steels nrog rau kev cuam tshuam toughness kuaj ntawm -20 degree, kom ntseeg tau tias kev ua tau zoo nyob rau hauv qhov chaw txias marine. Lawv thawj qhov sib txawv yog nyob rau hauv lub zog theem: DH50 muaj qhov tsawg kawg nkaus yield zog ntawm 500 MPa nrog tensile lub zog ntawm 610-770 MPa, haum rau high-strength offshore qauv, thaum DH69 muab ib tug ntau dua yield zog tsawg kawg nkaus lub zog ntawm 690 MPa nrog tensile xav tau mus txog 770-940% zoo heev daim ntaub ntawv. qhov siab tshaj qhov hnyav. Cov qib ob muaj cov tshuaj zoo sib xws nrog cov pa roj carbon tsawg dua lossis sib npaug li 0.20% thiab manganese Tsawg dua lossis sib npaug li 1.70%, thiab yuav tsum tau ua tiav zoo li TMCP lossis quenching thiab tempering kom ua tiav lawv cov khoom siv zoo tshaj plaws thaum tuav cov weldability zoo rau kev pabcuam marine tseem ceeb.

Tshuaj muaj pes tsawg leeg

LR EH50 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR EH 50	0.20	0.55	1.70	0.030	0.030	0.015	0.020
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.03-0.10	0.02

LR EH69 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR EH 69	0.20	0.55	1.70	0.030	0.030	0.015	0.020
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.03-0.10	0.02

Mechanical Property

LR EH50 muaj zog muaj zog ntxiv
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR EH 50	mm	Min Mpa	Mpa	Tsawg%	-40	J	J
	t Tsawg dua lossis sib npaug li 50	500	610-770	18%		33	50
	50＜t Tsawg dua lossis sib npaug rau 70	500	610-770	18%		33	50
	70＜t Tsawg dua lossis sib npaug rau 100	500	610-770	18%		33	50
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev

LR EH69 muaj zog muaj zog ntxiv
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR EH 69	mm	Min Mpa	Mpa	Tsawg%	-40	J	J
	t Tsawg dua lossis sib npaug li 50	690	770-940	16%		46	69
	50＜t Tsawg dua lossis sib npaug rau 70	690	770-940	16%		46	69
	70＜t Tsawg dua lossis sib npaug rau 100	690	770-940	16%		46	69
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev