Qhov sib txawv ntawm DNV F420 thiab DNV F460 steel phaj - Kev Paub

DNV F420 thiab DNV F460 yog offshore structural steel daim hlau ntawv pov thawj los ntawm Det Norske Veritas (DNV), muaj nyob rau hauv tshwj xeeb "F" (Fatigue resistant) zoo qeb. Lawv tau tsim tshwj xeeb rau cov pob qij txha tseem ceeb, cov pob qij txha, thiab lwm yam kev ntxhov siab ntau hauv cov txheej txheem sab nrauv xws li lub tsho platforms, qhov uas tiv thaiv kev qaug zog tawg nyob rau hauv cyclic yoj loading yog qhov tseem ceeb. Ob qib muab kev sib txuas zoo heev thiab muab nkag rau hauv qhov normalized (N) lossis thermomechanically dov (TM) kom ntseeg tau tias cov khoom zoo ib yam.

Qhov txawv tseem ceeb

Thawj qhov txawv yog nyob rau hauv lawv lub zog theem. Cov lej lej suav hais tias qhov tsawg kawg nkaus tawm lub zog hauv megapascals (MPa). Yog li ntawd, DNV F460 muab ib tug ntau dua guaranteed yield zog ntawm 460 MPa, piv rau F420's 420 MPa. Qhov no kwv yees li 9.5% lub zog kom zoo dua tso cai rau txo qhov hnyav hauv cov qauv tsim lossis nce load-cov kabmob muaj peev xwm nyob rau hauv tib seem seem. Txawm li cas los xij, kev ua tiav lub zog siab dua no hauv F460 feem ntau cuam tshuam nrog kev sib koom ua ke nruj dua thiab cov txheej txheem tswj hwm, uas tuaj yeem ua rau qis qis qis dua thiab lub qhov rai nqaim dua rau kev pom zoo weldability piv rau F420. Yog li ntawd, DNV F420 feem ntau pom zoo rau txoj kev nyuaj, tuab - cov pob qij txha nodal uas yooj yim ntawm kev tsim khoom yog qhov tseem ceeb, thaum F460 raug xaiv rau cov ntawv thov uas ua kom muaj zog tshaj plaws - rau - qhov hnyav piv yog tus qauv tsim tseem ceeb yam tsis muaj kev cuam tshuam qhov tseem ceeb qaug zog thiab toughness cov khoom yuav tsum tau los ntawm "F specification.

Tshuaj muaj pes tsawg leeg

DNV F420 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
DNV F420	0.18	0.10-0.55	1.6	0.025	0.025	0.015-0.08	0.020
	Nb	V	Ti	Cu	B	Ni	Mo
	0.02-0.05	0.04-0.10	0.02		0.005

DNV F460 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
DNV F460	0.18	0.10-0.55	1.6	0.025	0.025	0.015-0.08	0.020
	Nb	V	Ti	Cu	B	Ni	Mo
	0.02-0.05	0.04-0.10	0.02		0.005

Mechanical Property

DNV F420 ntxiv cov khoom muaj zog dav dav
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
DNV F420	mm	Min Mpa	Mpa	Tsawg%	-60	J	J
	t Tsawg dua lossis sib npaug li 50	420	530-680	18%		28	42
	50＜t Tsawg dua lossis sib npaug rau 70	420	530-680	18%		28	42
	70＜t Tsawg dua lossis sib npaug rau 150	420	530-680	18%		28	42
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev

DNV F460 ntxiv cov khoom muaj zog dav dav
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
DNV F460	mm	Min Mpa	Mpa	Tsawg%	-60	J	J
	t Tsawg dua lossis sib npaug li 50	460	570-720	17%		31	46
	50＜t Tsawg dua lossis sib npaug rau 70	460	570-720	17%		31	46
	70＜t Tsawg dua lossis sib npaug rau 150	460	570-720	17%		31	46
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev