Yuav ua li cas txhua yam khoom ntawm Q355NH weathering steel phaj piv rau lwm hom hlau phaj? - Kev Paub

Q355NH (GB/T 4171) yog ib qho qis - alloy weathering steel, nrog rau cov khoom siv kho tshuab tseem ceeb sib npaug ntawm cov qauv siv zog, huab cua tsis kam thiab kev ua haujlwm. Nws qhov kev ua tau zoo yog piv nrogCov pa roj carbon zoo tib yam (Q235B), General qis- alloy steel (Q355B)thiabimported weathering steel (SPA-H/A588 Gr.B)raws li hauv qab no, tsom mus rau chav tseem ceeb- ntsuas qhov ntsuas kub (rau daim hlau ≤16mm) thiab qhov tseem ceeb ntawm kev ua haujlwm sib txawv:

1. Core Mechanical Property Table piv

Hom hlau	Yield zog (≥MPa)	Tensile zog (MPa)	Elongation (≥%)	-20℃Impact Toughness (KV ≥ J)	Core Highlight
Q355NH (Wathering)	355	470~630	21	34	Huab cua corrosion kuj + siab zog + zoo toughness
Q355B (Tsawg- alloy)	355	470~630	21	34 (≥0℃tus qauv, -20℃xaiv tau)	Siab zog, tsis muaj huab cua tsis kam
Q235B (Carbon steel)	235	375~500	26	- (tsis muaj qhov yuav tsum tau muaj kev cuam tshuam)	Tsawg zog, tsis zoo corrosion kuj
SPA-H (JIS Huab cua)	345	480~620	22	34	Zoo sib xws huab cua tsis kam, me ntsis qis tawm lub zog tshaj Q355NH
A588 Gr.B (ASTM Weathering)	345	480~650	21	27 (-30 ° C)	Zoo dua qis-kub toughness, sib piv huab cua tsis kam nrog Q355NH

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2. Qhov tseem ceeb Performance Differences & Positioning

▶ VS Ordinary Carbon Steel (Q235B)

Q355NH muaj60% siab dua yield zogdua li Q235B, nrog deb zoo dua qis-kub qhov cuam tshuam toughness (yuav tsum tau -20℃KV≥34J vs Q235B tsis tas yuav tsum tau ua). Qhov sib txawv loj tshaj plaws yoghuab cua corrosion kuj: Q355NH forms a dense protective patina (corrosion rate ≤0.03mm/year), while Q235B rusts continuously (corrosion rate 0.1~0.3mm/year) and requires regular coating.

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▶ VS General Low- alloy hlau (Q355B)

Ib yam yooj yim mechanical zog(yield / tensile / elongation), thiab ob leeg muaj weldability / formability zoo. Qhov sib txawv tseem ceeb yog Q355NH'sCu/Cr/Ni alloy weathering system(ntxiv 0.2 ~ 0.5% Cu, 0.4 ~ 0.8% Cr), uas endows nws nrog inherent atmospheric corrosion resistance-Q355B tsis muaj weathering hais thiab yuav xeb sai sai nyob rau hauv sab nraum zoov uncoated tej yam kev mob.

▶ VS Imported Weathering Steel (SPA-H/A588 Gr.B)

VS SPA-H (Japanese standard):Q355NH ib10MPa siab dua yield zog, nrog yuav luag tib lub zog tensile thiab huab cua tsis kam; ob qho tib si tsim nyog rau kev siv toj roob hauv pes / vaj tse, thiab Q355NH yog tus nqi ntau dua -zoo rau cov haujlwm hauv tsev.

VS A588 Gr.B (tus qauv Asmeskas): A588 Gr.B tau zoo dua ultra-tsawg- kub toughness (-30℃KV≥27J vs Q355NH's -20 degree), thiab me ntsis zog tensile lub zog sab sauv txwv; Q355NH tau sib tw ntau dua nrog cov qauv kev tsim vaj tsev hauv Suav teb thiab muaj tus nqi qis dua.

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3. Kev Ua Haujlwm Zoo Tshaj Plaws

Q355NH yog atus nqi-kev ua tau zoo tshaj plaws huab cua steelrau kev siv sab nraum zoov:

Nws ua rau qhov tsis xws luag ntawm Q235B / Q355B (tsis muaj huab cua tsis kam, tus nqi saib xyuas siab) thiab muajsib npaug los yog me ntsis zoo dua cov qauv siv zogdua li cov hlau uas muaj huab cua txawv teb chaws (SPA-H);

Piv nrog rau siab - alloy corrosion- cov hlau tsis muaj zog (xws li 304 stainless hlau), nws lub zog yog nyob ze tab sis tus nqi tsuas yog 1/3 ~ 1/2, thiab nws muaj qhov zoo dua formability / weldability (stainless hlau yog feem ntau rau intergranular corrosion thaum vuam);

Qhov kev txwv nkaus xwb yog tias nws qhov kev tiv thaiv corrosion yog qis dua cov hlau tsis muaj steel, thiab nws tsis haum rau qhov chaw corrosive hnyav (siab- ntsev / kua qaub).

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