Puas yuav cov ntsiab lus carbon ntawm weathering steel daim hlau cuam tshuam rau huab cua tiv thaiv?

Dec 30, 2025 Tso lus

Covcov ntsiab lus carbonntawm weathering steel daim hlau cuam tshuam rau lawv cov huab cua tsis kam, txawm tias nws yog ibthib ob yam-cov tsav tsheb tseem ceeb ntawm huab cua tsis kam yog cov khoom siv hlau xws li Cu, Cr, Ni, thiab P.

info-401-386

1. Optimal Carbon Content Range for Good Weather Resistance

Mainstream weathering steel qib (piv txwv li, SPA-H, Q355NH, Corten A) yog tsim los nrogTsawg thiab tswj cov ntsiab lus ntawm 0.08-0.20%. Qhov no range:

Txhawb kev hnav khaub ncawsferrite-pearlite microstructure, uas muab lub hauv paus zoo ib yam rau nucleation thiab kev loj hlob ntawm cov txheej txheem patina.

Zam kev nyuaj, ntu ntu (xws li pearlite) uas ua rau micro-galvanic corrosion thiab cuam tshuam patina txuas ntxiv.

info-491-455

2. Negative Impacts of Excessive Carbon Content (>0.20%)

Thaum cov ntsiab lus carbon ntau tshaj 0.20%, cov hlau tsis zoo rau huab cua tsis zoo rau ob qho laj thawj tseem ceeb:

Nce pearlite ntsiab lus: Pearlite yog electrochemically nquag tshaj ferrite, tsim me me galvanic hlwb ntawm cov hlau nto. Qhov no accelerates thawj rusting thiab tiv thaiv kev tsim ntawm ib tug ntom, nruam patina txheej.

Txo weldability thiab ductility: Cov ntsiab lus carbon siab ua rau muaj kev pheej hmoo ntawm vuam tawg thiab tom qab- ua cov brittleness. Cov kab nrib pleb thiab qhov tsis xws luag dhau los ua cov ntsiab lus pib rau hauv cheeb tsam corrosion (xws li pitting), ua rau tsis muaj zog ntxiv mus ntev - huab cua tsis kam.

info-492-479

3. Cov ntsiab lus carbon vs. Alloying Elements: Qhov tseem ceeb ua ntej

Nws yog ib qho tseem ceeb kom nco ntsoov tiasalloying ntsiab yog lub hauv paus txiav txim siab ntawm huab cua tsis kam. Txawm tias muaj cov ntsiab lus carbon zoo, huab cua hlau yuav tsis txhim kho nws qhov kos npe tiv thaiv patina yam tsis muaj Cu (0.20-0.55%), Cr (0.30-1.25%), thiab lwm yam alloy ntxiv. Cov ntsiab lus no tau muab tso rau hauv patina txheej kom txo cov porosity thiab txhim kho adhesion rau steel substrate.

info-497-492