Qhov sib txawv ntawm S355G7+N thiab S355G9+N - Kev Paub

S355G7+N thiab S355G9+N yog qhov zoo li qub- cov qauv steel phaj ua raws li European tus qauv EN 10025-4. Qhov kev xaiv qhia tau hais tias qhov tsawg kawg nkaus tawm lub zog ntawm 355 MPa, nrog rau "+ N" suffix qhia qhov kev xa khoom zoo. Qhov tseem ceeb "G" tivthaiv xaiv cov qib no rau kev siv qis (sub- xoom) qhov kub thiab txias, qhov "G7" thiab "G9" qhia qhov lav qhov tsawg kawg nkaus Charpy V-notch cuam tshuam lub zog (hauv Joules) ntawm qhov ntsuas kub tshwj xeeb. Cov qib no yog tsim los rau cov txheej txheem welded tseem ceeb ua haujlwm hauv Arctic thiab huab cua txias ib puag ncig, xws li offshore platforms, LNG cia tso tsheb hlau luam, icebreaker hulls, thiab txuas hniav hauv cheeb tsam txias.

Qhov txawv tseem ceeb:

Qhov sib txawv tseem ceeb nyob rau hauv lawv qhov qis -kub toughness kev ua tau zoo. S355G7+N yog raug kuaj ntawm -50℃nrog kev lees paub qhov tsawg kawg nkaus lub zog ntawm 27 Joules, whereas S355G9+N yog kuaj ntawm qhov kub thiab txias ntawm -60℃nrog tib yam 27 Joules yam tsawg kawg nkaus. Qhov no ua rau S355G9+N cov khoom siv tawv dua, tsim los rau qhov hnyav dua Arctic lossis tob-cryogenic qhov twg S355G7+N yuav tsis haum.

Ua kom tiav qhov kev txhim kho toughness ntawm qhov kub qis dua yuav tsum muaj txheej txheem hlau nruj dua rau S355G9+N. Thaum ob qib siv zoo -kev xyaum nplej thiab normalization, S355G9+N feem ntau muaj kev tswj xyuas nruj dua ntawm cov tshuaj muaj pes tsawg leeg (tshwj xeeb tshaj yog qis dua phosphorus thiab sulfur qib rau kev txhim kho kev huv) thiab kev ua haujlwm tsis zoo kom ntseeg tau tias muaj kev sib haum xeeb ntau dua thiab tsis zoo- tiv taus cov kab mob khaub thuas uas muaj peev xwm tiv taus. Yog li ntawd, kev tsim thiab vuam ntawm S355G9+N xav tau cov txheej txheem nruj dua los khaws nws qhov qis dua -kub toughness nyob rau hauv weld tshav kub- cuam tshuam cheeb tsam, feem ntau yuav tsum tau tshwj xeeb tsim nyog welding consumables thiab tswj kub input.

S355G7+N steel phajTshuaj muaj pes tsawg leeg

S355G7+NTshuaj muaj pes tsawg leeg
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
S355G7+N	0.14	0.15-0.55	1.0-0.01	0.02	0.01	0.0055	0.01
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.04	0.06	0.025	0.3	0.25	0.5	0.08

S355G9+N steel phajTshuaj muaj pes tsawg leeg

C	Si	Mn	P	S	Cr	Mo	Ni	Al	Cu	N	Nb	Ti	V	Nb + V
0.12	0.15/0.55	1.65	0.02	0.01	0.20	0.08	0.7	0.015/0.055	0.3	0.01	0.03	0.025	0.06	0.06

S355G7+N steel phajzog khoom

S355G7+N siabzog khoom
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
S355G7+N	mm	Min Mpa	Mpa	Tsawg%	-40	J	J
	t Tsawg dua lossis sib npaug li 50	355	470-630	22%		50	50
	50＜t Tsawg dua lossis sib npaug rau 63	355	470-630	22%		50	50
	63＜t Tsawg dua lossis sib npaug rau 100	325	490-630	22%		50	50
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev

S355G9+N steel phaj Mechanical Properties

Qib	S355G9+N steel phaj Mechanical Properties (min) tshwj tsis yog hais
	Tensile zog		Yield zog						Elongation A
	Thickness (hli)		Thickness t - hli						Elongation A
	Tsawg dua los yog sib npaug li 100	>100	Tsawg dua los yog sib npaug li 16	16	25	40	63	100	%
S355G9+N	470/630	–	355	355	345	335	325	–	22