Qhov sib txawv ntawm S275N thiab S355N steel phaj

Dec 29, 2025 Tso lus

S275N thiab S355N yog cov qauv European (EN 10025-3) zoo-cov khoom siv hlau, sib txawv los ntawm cov khoom siv zog (S275 muaj ~ 275 MPa, S355 muaj ~ 355 MPa), nrog S355 muab lub zog ntau dua rau cov khoom hnyav, xws li S275 thiab lwm yam cranes. Cov qauv dav dav, ob leeg tau txais txiaj ntsig zoo rau kev sib txuas zoo thiab tsis tshua muaj qhov kub thiab txias vim yog 'N' (Normalized) tsim, ua rau lawv muaj ntau yam rau cov haujlwm xav tau.

S275N thiab S355N yog ob qho tib si zoo li qub -cov qauv hlau phaj tsim los rau kev tsim kho welded xav tau kev txhim kho toughness ntawm qhov kub qis mus rau -20℃.

S275N muaj qhov tsawg kawg nkaus lub zog ntawm 275 MPa, thaum S355N muab lub zog siab dua ntawm 355 MPa, ua rau S355N haum rau cov khoom hnyav dua S275N.

Kev sib piv tshuaj lom neeg

Element	Cim	S275N Max (%)	S355N Max (%)
Cov pa roj carbon	C	0.20	0.20
Silicon	Si	0.40	0.50
Manganese	Mn	0.80–1.60	0.90–1.60
Phosphorus	P	0.035	0.025
Sulfur	S	0.030	0.020
Chromium	Cr	0.30	0.30
Molybdenum	Mo	0.10	0.10
Vanadium	V	0.05	0.12
Nitrogen	N	0.012	0.015
Niobium	Nb	0.050	0.050
Titanium	Ti	0.050	0.050
Aluminium	Al	Ntau dua lossis sib npaug rau 0.020	Ntau dua lossis sib npaug rau 0.020
Tooj	Cu	0.35	0.55
CEV	-	0.40	0.43

Mechanical Properties Sib piv

Nominal Thickness (hli)	Yield ReH Min (MPa) S275N	Yield ReH Min (MPa) S355N	Tensile Rm (MPa) S275N	Tensile Rm (MPa) S355N	Elongation A Min (%) Ob leeg	Charpy KV Longitudinal Min (J) ntawm -20℃Ob leeg
Tsawg dua los yog sib npaug li 16	275	355	370–530	470–630	23	47
16	265	345	370–530	470–630	23	47
40	255	335	370–530	470–630	23	47
63	245	325	370–530	470–630	22	47
80	235	315	370–530	470–630	22	47
100	225	295	350–510	450–600	22	47
150	215	285	350–510	450–600	22	47
200	195	265	350–510	450–600	22	47

Kev kho cua sov thiab vuam sib piv
Kev kho cua sov: Ob qho tib si normalized (+N: 880-920℃austenitize, cua txias) kom zoo - nplej.
Vuam: Tsawg CEV (0.40/0.43), tsis muaj preheat Tsawg dua lossis sib npaug li 40 hli; S355N yuav xav tau kev saib xyuas ntau dua rau cov ntu tuab.
Ua raws EN 1011-2. Gangsteel optimizes rau ob qho tib si.