Qhov sib txawv ntawm LR DH46 thiab LR DH69 steel phaj - Kev Paub

LR DH46 yog ib qho ntxiv - siab - lub zog marine steel phaj ntawv pov thawj los ntawm Lloyd's Register (LR). Qhov kev xaiv "DH" txhais tau hais tias nws yog qib siab dua - qib zog nrog kev cuam tshuam toughness kuaj ntawm -20℃. Nws muaj qhov tsawg kawg nkaus yield zog ntawm 460 MPa thiab tensile zog xws li 570 mus rau 720 MPa, nrog tsawg kawg nkaus elongation ntawm 19% rau thicknesses txog 100 hli. Kev cuam tshuam lub zog ntawm -20℃yog yam tsawg kawg nkaus 46J (ntev) lossis 31J (transverse). Cov tshuaj lom neeg muaj pes tsawg leeg muaj cov pa roj carbon tsawg dua lossis sib npaug li 0.20%, manganese Tsawg dua lossis sib npaug li 1.70%, nrog cov ntsiab lus microalloying suav nrog Nb thiab V. Cov qib no feem ntau muab rau hauv cov xwm txheej zoo li qub lossis tswj tau thiab siv dav rau kev tsim vaj tsev thiab sab nrauv.

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 ntau dua li ntawm 770 txog 940 MPa thiab qhov tsawg kawg nkaus elongation ntawm 16% rau thicknesses txog 100mm. Kev cuam tshuam lub zog ntawm -20℃yog yam tsawg kawg nkaus 69J (ntev) lossis 46J (transverse). Cov tshuaj muaj pes tsawg leeg zoo ib yam li DH46 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 ntawm cov khoom siv hauv nkoj tsim thiab cov chaw tawm sab nrauv uas xav tau qhov siab tshaj plaws ntawm lub zog-rau-hnyav piv.

Ob leeg LR DH46 thiab LR DH69 yog LR- ntawv pov thawj siab - lub zog marine steels nrog rau kev cuam tshuam toughness kuaj ntawm -20 degree, kom ntseeg tau tias kev ua tau zoo hauv cov dej hiav txwv txias. Lawv qhov sib txawv tseem ceeb nyob rau hauv lub zog theem: DH46 muaj qhov tsawg kawg nkaus lub zog ntawm 460 MPa nrog tensile lub zog ntawm 570-720 MPa, haum rau kev siv lub zog siab dav dav dav, thaum DH69 muab qhov muaj zog ntau dua qhov tsawg kawg nkaus lub zog ntawm 690 MPa nrog tensile-lub zog ntau tshaj 70% ntawm 70% siab tshaj. xav tau daim ntawv thov load-bearing yuav tsum tau txo qhov hnyav tshaj plaws. Ob qib muaj cov tshuaj tiv thaiv zoo sib xws nrog cov pa roj carbon tsawg dua lossis sib npaug li 0.20% thiab yuav tsum tau ua tiav qib siab kom ua tiav lawv cov khoom siv kho tshuab thaum tuav cov weldability zoo rau kev pabcuam marine tseem ceeb.

Tshuaj muaj pes tsawg leeg

LR DH46 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR DH46	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 DH69 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR DH69	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 DH46 ntxiv zog muaj zog
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR DH46	mm	Min Mpa	Mpa	Tsawg%	-20	J	J
	t Tsawg dua lossis sib npaug li 50	460	570-720	19%		31	46
	50＜t Tsawg dua lossis sib npaug rau 70	460	570-720	19%		31	46
	70＜t Tsawg dua lossis sib npaug rau 100	460	570-720	19%		31	46
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev

LR DH69 muaj zog muaj zog ntxiv
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR DH69	mm	Min Mpa	Mpa	Tsawg%	-20	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