LR DH62 vs LR DH69 - Kev Paub

LR DH62 yog ultra-siab- lub zog marine steel phaj ntawv pov thawj los ntawm Lloyd's Register (LR). Qib "D" qhia tau hais tias nws muaj kev cuam tshuam los ntawm -20 ° C, kom ntseeg tau tias muaj zog toughness rau qhov chaw txias marine. Nws muaj qhov tsawg kawg nkaus yield zog ntawm 620 MPa thiab tensile lub zog ntawm 720 mus rau 890 MPa, nrog tsawg kawg elongation ntawm 17%. Cov tshuaj muaj pes tsawg leeg yog nruj me ntsis tswj nrog carbon ≤0.20% thiab manganese ≤1.70%, featuring microalloying ntsiab xws li Nb, V, Ti, Cu, Cr, Ni, thiab Mo. Cov qib no feem ntau yog muab rau hauv quenched thiab tempered (QT) lossis TMCP cov xwm txheej thiab yog tsim los rau cov txheej txheem kev nyuab siab hauv kev tsim cov nkoj niaj hnub thiab kev ua haujlwm 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 ° C . Lub "69" qhia txog qhov tsawg kawg nkaus lub zog ntawm 690 MPa thiab lub zog tensile xws li 770 txog 940 MPa, nrog qhov tsawg kawg nkaus elongation ntawm 16%. Kev cuam tshuam lub zog yuav tsum muaj tsawg kawg yog 69J (ntev) lossis 46J (transverse) ntawm -20 ° C . Cov tshuaj muaj pes tsawg leeg zoo ib yam li DH62 nrog carbon ≤0.20% thiab manganese ≤1.70%, nrog rau microalloying ntsiab. Qib no yuav tsum tau ua tiav qib siab xws li TMCP lossis quenching thiab tempering thiab yog tsim los rau qhov xav tau tshaj plaws load-cov ntaub ntawv bearing xav tau qhov siab tshaj plaws-rau-hnyav piv .

Ob leeg LR DH62 thiab LR DH69 yog LR- ntawv pov thawj ultra- siab- lub zog marine steels nrog rau kev cuam tshuam zoo heev ntawm kev sim ntawm -20 ° C, 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: DH62 muaj qhov tsawg kawg nkaus tawm lub zog ntawm 620 MPa nrog tensile lub zog ntawm 720-890 MPa, haum rau cov kev ntxhov siab ntawm cov qauv, thaum DH69 muab ib tug ntau dua qhov tsawg kawg nkaus yield zog ntawm 690 MPa nrog tensile xav tau lub zog mus txog 770-90 requirement rau pob ntseg siab tshaj plaws loading. poob phaus.

Tshuaj muaj pes tsawg leeg

LR DH62 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR DH62	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 DH62 muaj zog muaj zog ntxiv
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR DH62	mm	Min Mpa	Mpa	Tsawg%	-20	J	J
	t≤50	620	720-890	17%		41	62
	50 t 70	620	720-890	17%		41	62
	70＜t≤100	620	720-890	17%		41	62
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≤50	690	770-940	16%		46	69
	50 t 70	690	770-940	16%		46	69
	70＜t≤100	690	770-940	16%		46	69
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev