Dab tsi yog qhov txawv ntawm LR DH62 thiab LR DH69 steel phaj? - Kev Paub

LR DH62 yog ultra-siab- lub zog marine steel phaj ntawv pov thawj los ntawm Lloyd's Register (LR). Qhov kev xaiv "DH" qhia tias nws yog qib siab dua - qib zog nrog kev cuam tshuam toughness kuaj ntawm -20 ° C . Nws muaj qhov tsawg kawg nkaus lub zog ntawm 620 MPa thiab tensile lub zog ntawm 720 txog 890 MPa, nrog rau qhov tsawg kawg nkaus elongation ntawm 17% rau thicknesses txog 100 hli. 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, thiab Ti. Kev cuam tshuam lub zog yuav tsum muaj tsawg kawg yog 62J (ntev) lossis 41J (transverse) ntawm -20 ° C . Cov qib no yog tsim los rau cov txheej txheem tseem ceeb hauv kev tsim cov nkoj niaj hnub thiab kev ua haujlwm sab nrauv, muab qhov tshwj xeeb ntawm lub zog-rau-hnyav piv.

LR DH69 yog ib qho tseem ceeb dua 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 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. Cov tshuaj muaj pes tsawg leeg zoo ib yam li DH62 nrog carbon ≤0.20% thiab manganese ≤1.70%, nrog rau microalloying ntsiab. Kev cuam tshuam lub zog yuav tsum muaj tsawg kawg yog 69J (ntev) lossis 46J (transverse) ntawm -20 ° C. Qib no yog tsim los rau qhov xav tau tshaj plaws load-cov ntaub ntawv siv hauv nkoj tsim, ultra- cov nkoj loj, thiab cov qauv hauv ntug dej hiav txwv uas xav tau qhov siab tshaj plaws ntawm qhov hnyav-rau-qhov hnyav.

Ob leeg LR DH62 thiab LR DH69 yog LR- ntawv pov thawj ultra- siab- 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 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 kev ntxhov siab cov yam ntxwv Cheebtsam, thaum DH69 muab ib tug ntau dua qhov tsawg kawg nkaus yield zog ntawm 690 MPa nrog tensile lub zog ncav cuag 770-90% kev thov zoo heev. yuav tsum tau txo qhov hnyav tshaj plaws. Cov qib ob muaj cov tshuaj zoo sib xws nrog cov pa roj carbon ≤0.20% thiab manganese ≤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 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