Qhov sib txawv ntawm LR DH40 thiab LR DH42 steel phaj

Dec 18, 2025 Tso lus

Qhov sib txawv tseem ceeb ntawm LR DH40 thiab LR DH42 steel daim hlau yog nyob rau hauv lawv lub zog thiab toughness theem, nrog "D" qhia lub zog siab, "H" qhia txog kev kho cua sov, thiab tus lej (40 vs. 42}) taw qhia rau lawv qhov tsawg kawg nkaus tawm lub zog (nyob ib ncig ntawm 390 MPa vs . 420 MPa) thiab txhim khu kev ua haujlwm qis {{6} DH42 haum rau txias, hnyav marine tej yam kev mob dua DH40, thaum ob leeg muab zoo weldability rau shipbuilding.

LR: Lloyd's Register (lub koom haum kev faib tawm qhia tus qauv).

D: Siab zog hlau.

H: Thaum tshav kub kub kho.

40 / 42: Qhia qhov tsawg kawg nkaus yield zog (kgf / mm²) thiab coj toughness.

Tshuaj muaj pes tsawg leeg

LR DH40 siab zog tshuaj muaj pes tsawg leeg
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR DH40	0.18	0.05	0.9-1.6	0.035	0.035	0.015
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.03-0.10	0.02	0.35	0.20	0.40	0.08

LR DH42 ntxiv muaj zog Chemical Composition
Qib	Cov ntsiab lus Max (%)
Qib	C	Si	Mn	P	S	Al	N
LR DH42	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 DH40 siab zog khoom
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR DH40	mm	Min Mpa	Mpa	Tsawg%	-20	J	J
	t Tsawg dua lossis sib npaug li 50	390	510-650	20%		26	39
	50＜t Tsawg dua lossis sib npaug rau 70	390	510-650	20%		31	46
	70＜t Tsawg dua lossis sib npaug rau 100	390	510-650	20%		37	55

LR DH42 ntxiv cov khoom muaj zog
Qib		Mechanical Property			Charpy V Impact Test
Qib	Thickness	Yield	Tensile	Elongation	Qib	Zog 1	Zog 2
LR DH42	mm	Min Mpa	Mpa	Tsawg%	-20	J	J
	t Tsawg dua lossis sib npaug li 50	420	530-680	20%		28	42
	50＜t Tsawg dua lossis sib npaug rau 70	420	530-680	20%		28	42
	70＜t Tsawg dua lossis sib npaug rau 100	420	530-680	20%		28	42
Lus Cim: Lub Zog 1 yog qhov kev cuam tshuam cuam tshuam, Lub Zog 2 yog qhov ntev