Qhov txawv ntawm LR DH32 thiab LR DH36 steel phaj - Kev Paub

LR DH32 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" qhia tau hais tias nws muaj kev cuam tshuam los ntawm -20 ° C, kom ntseeg tau tias muaj kev ruaj ntseg rau cov nkoj ua haujlwm hauv qhov chaw txias marine. Nws muaj qhov tsawg kawg nkaus lub zog ntawm 315 MPa (46 ksi) thiab lub zog tensile xws li 440 txog 590 MPa (64-85 ksi), nrog qhov tsawg kawg nkaus elongation ntawm 22%. Cov tshuaj muaj pes tsawg leeg yog nruj me ntsis tswj nrog carbon ≤0.18% thiab manganese 0.90-1.60%. Cov qib no feem ntau yog muab rau hauv cov xwm txheej zoo li qub lossis tswj tau dov thiab tau siv dav rau cov qauv hull, offshore platforms, thiab cov khoom siv nkoj dav dav.

LR DH36 kuj tseem yog qhov siab dua - lub zog steel phaj ntawv pov thawj los ntawm LR, nrog rau tib qhov kev ntsuas kub ntawm -20 ° C . Lub "36" qhia txog qhov tsawg kawg nkaus lub zog ntawm 355 MPa thiab tensile lub zog ntawm 490 txog 620 MPa, nrog qhov tsawg kawg nkaus elongation ntawm 21%. Cov tshuaj muaj pes tsawg leeg zoo ib yam li DH32 nrog carbon ≤0.18% thiab manganese 0.90-1.60%, tab sis DH36 yuav muaj microalloying ntsiab zoo li Nb thiab V kom ua tiav nws lub zog siab dua. Qib no yog tsim los rau kev xav tau ntau dua load-bearing daim ntaub ntawv nyob rau hauv shipbuilding, nrog rau cov hull shells, longitudinal stiffeners, thiab thawj cov qauv.

Ob leeg LR DH32 thiab LR DH36 yog LR- ntawv pov thawj siab dua - lub zog marine steels nrog rau kev cuam tshuam toughness kuaj ntawm -}20 ° C, 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: DH32 muaj qhov tsawg kawg nkaus lub zog ntawm 315 MPa nrog lub zog tensile ntawm 440-590 MPa, haum rau kev siv lub zog loj dav dav thiab cov qauv tsim theem nrab, thaum DH36 muab qhov siab tshaj qhov tawm los ntawm 355 MPa nrog tensile lub zog xav tau ntau tshaj 490 MPa, xav tau lub zog zoo dua. Ob qib tshwj xeeb tswj cov tshuaj muaj pes tsawg leeg thiab tswj kom muaj kev sib txuas zoo rau cov kev pabcuam tseem ceeb hauv hiav txwv, ua rau lawv cov khoom tseem ceeb rau kev tsim cov nkoj thiab cov chaw tawm ntug dej hiav txwv.

Tshuaj muaj pes tsawg leeg

LR DH32 siab zog tshuaj muaj pes tsawg leeg
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR DH 32	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 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

Mechanical Property

LR DH32 siab zog khoom
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR DH 32	mm	Min Mpa	Mpa	Tsawg%	-20	J	J
	t≤50	315	440-590	22%		20	31
	50 t 70	315	440-590	22%		26	38
	70＜t≤100	315	440-590	22%		31	46
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev

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≤50	355	490-630	21%		24	34
	50 t 70	355	490-630	21%		27	41
	70＜t≤100	355	490-630	21%		34	50
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev