Qhov txawv ntawm LR AH55 thiab LR AH62 steel phaj - Kev Paub

LR AH55 yog ib qho ultra-siab- lub zog marine steel phaj ntawv pov thawj los ntawm Lloyd's Register (LR) rau kev thov rau kev tsim nkoj thiab kev siv sab nrauv. Nws muaj qhov tsawg kawg nkaus lub zog ntawm 355 MPa thiab tensile lub zog ntawm 550 mus rau 700 MPa, nrog rau qhov tsawg kawg nkaus elongation ntawm 21%. Cov tshuaj muaj pes tsawg leeg muaj cov pa roj carbon tsawg dua lossis sib npaug li 0.18%, manganese 0.90-1.60%, thiab suav nrog cov ntsiab lus alloying xws li chromium (0.20-0.40%), nickel (0.20-0.80%), thiab tooj liab (0.35%). Impact toughness yog kuaj ntawm -40 degree, yuav tsum tau yam tsawg kawg nkaus 47J. Cov qib no feem ntau yog muab rau hauv qhov qub, quenched thiab tempered (QT), lossis TMCP cov xwm txheej thiab yog siv rau cov ntug dej hiav txwv drilling platforms thiab nkoj hulls.

LR AH62 yog ib qho ultra- siab- lub zog marine steel phaj kuj tau lees paub los ntawm Lloyd's Register (LR), tsim los rau cov kev xav tau tshaj plaws ntawm cov qauv siv. Nws muaj qhov tsawg kawg nkaus lub zog ntawm 620 MPa (los yog 440 MPa nyob ntawm tus qauv) thiab lub zog tensile xws li 620 txog 800 MPa, nrog qhov tsawg kawg nkaus elongation ntawm 17-19%. Cov tshuaj muaj pes tsawg leeg yog complex tshaj AH55, nrog carbon tsawg dua los yog sib npaug zos rau 0.18-0.21%, manganese 0.90-1.70%, thiab ntxiv alloying ntsiab xws li npib tsib xee (0.70-1.80%), chromium (0.40-1.60%), thiab molybdenum (tsawg tshaj li 70%). Impact toughness yog kuaj ntawm 0 degree, yuav tsum tau yam tsawg kawg nkaus 41J (transverse) thiab 62J (ntev). Qib no yog xa mus rau hauv cov xwm txheej zoo li qub lossis quenched thiab tempered (QT).

Ob leeg LR AH55 thiab LR AH62 yog LR- ntawv pov thawj ultra- siab- lub zog marine steels tsim los rau kev tsim nkoj thiab kev siv sab nrauv. Lawv qhov sib txawv tseem ceeb yog nyob rau theem siab zog thiab qis-kub kev ua haujlwm: AH55 muaj lub zog tensile ntau ntawm 550-700 MPa nrog superior kub-kub toughness kuaj ntawm -40 degree, ua rau nws zoo tagnrho rau Arctic offshore platforms; thaum AH62 muab lub zog ntau dua (txog 800 MPa tensile) thiab ntiav cov txheej txheem ntau dua alloying nrog Ni, Cr, thiab Mo ntxiv kom ua tiav nws cov khoom kho kom zoo dua qub. 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 AH55 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR AW 55	0.21	0.55	1.70	0.035	0.035	0.015	0.020
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.03-0.10	0.02

LR AH62 ntxiv zog muaj zog tshuaj lom neeg muaj pes tsawg leeg
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR AH 62	0.21	0.55	1.70	0.035	0.035	0.015	0.020
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.03-0.10	0.02

Mechanical Property

LR AH55 muaj zog muaj zog ntxiv
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR AW 55	mm	Min Mpa	Mpa	Tsawg%	0	J	J
	t Tsawg dua lossis sib npaug li 50	550	670-830	18%		37	55
	50＜t Tsawg dua lossis sib npaug rau 70	550	670-830	18%		37	55
	70＜t Tsawg dua lossis sib npaug rau 100	550	670-830	18%		37	55
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev

LR AH62 muaj zog muaj zog ntxiv
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR AH 62	mm	Min Mpa	Mpa	Tsawg%	0	J	J
	t Tsawg dua lossis sib npaug li 50	620	720-890	17%		41	62
	50＜t Tsawg dua lossis sib npaug rau 70	620	720-890	17%		41	62
	70＜t Tsawg dua lossis sib npaug rau 100	620	720-890	17%		41	62
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev

Qhov sib txawv ntawm LR AH55 thiab LR AH62 steel phaj