Dab tsi yog qhov txawv ntawm LR DH36 thiab LR DH42 steel phaj? - Kev Paub

LR DH36 yog qhov siab dua - lub zog steel phaj ntawv pov thawj los ntawm Lloyd's Register (LR) rau kev tsim khoom nkoj thiab kev siv dej hiav txwv. Qib "D" txhais tau hais tias nws raug kuaj ntawm -20 degree. Nws muaj qhov tsawg kawg nkaus lub zog ntawm 355 MPa thiab tensile lub zog ntawm 490 mus rau 620 MPa, nrog qhov tsawg kawg nkaus elongation ntawm 21%. Cov tshuaj muaj pes tsawg leeg yog nruj me ntsis tswj nrog carbon Tsawg dua los yog sib npaug rau 0.18% thiab manganese 0.90-1.60%. Qib no yog siv dav rau cov qauv hull, offshore platforms, thiab cov khoom tsim nkoj xws li cov neeg nqa khoom loj thiab cov nkoj ntim khoom.

LR DH42 yog ib qho ntxiv - siab - lub zog steel phaj kuj tau lees paub los ntawm Lloyd's Register (LR) nrog rau kev cuam tshuam toughness kuaj ntawm -20℃. Lub "42" qhia txog qhov tsawg kawg nkaus lub zog ntawm 420 MPa thiab lub zog tensile xws li 530 txog 680 MPa, nrog qhov tsawg kawg nkaus elongation ntawm 20%. 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 rau cov khoom txhim kho. Qib no yog tsim los rau kev xav tau ntau yam ntawm cov qauv hauv kev tsim cov nkoj thiab offshore platforms xav tau lub zog ntau dua.

Ob leeg LR DH36 thiab LR DH42 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 nyob rau hauv qhov chaw txias marine. Lawv qhov sib txawv tseem ceeb nyob rau hauv lub zog theem: DH36 muaj qhov tsawg kawg nkaus lub zog ntawm 355 MPa nrog tensile lub zog ntawm 490-620 MPa, haum rau kev siv lub zog loj dav dav, thaum DH42 muab qhov siab tshaj qhov tawm los ntawm 420 MPa nrog lub zog tensile thov mus txog 530-680 cov ntaub ntawv siv zog ntau dua. . Ob chav kawm muaj cov tshuaj tiv thaiv muaj pes tsawg leeg thiab tswj cov weldability zoo rau cov kev pabcuam tseem ceeb hauv hiav txwv.

Tshuaj muaj pes tsawg leeg

LR DH36 siab zog tshuaj muaj pes tsawg leeg
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR DH 36	0.18	0.05	0.9-1.6	0.035	0.035	0.015
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.03-0.10	0.02	0.35	0.20	0.40	0.08

LR DH42 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR DH42	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 DH36 siab zog khoom
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR DH 36	mm	Min Mpa	Mpa	Tsawg%	-20	J	J
	t Tsawg dua lossis sib npaug li 50	355	490-630	21%		24	34
	50＜t Tsawg dua lossis sib npaug rau 70	355	490-630	21%		27	41
	70＜t Tsawg dua lossis sib npaug rau 100	355	490-630	21%		34	50
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev

LR DH42 ntxiv zog muaj zog
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR DH42	mm	Min Mpa	Mpa	Tsawg%	-20	J	J
	t Tsawg dua lossis sib npaug li 50	420	530-680	20%		28	42
	50＜t Tsawg dua lossis sib npaug rau 70	420	530-680	20%		28	42
	70＜t Tsawg dua lossis sib npaug rau 100	420	530-680	20%		28	42
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev