1. ** Er ERW Carbon Steel? **
Ja, ERW (elektrisk modstandsvejset) rør er primært lavet af ** carbon stål ** . ERW -processen beskriver, hvordan sømmen svejses, ikke materialet . kulstofstål er det mest almindelige basismateriale til ERW -rør .
2. ** Hvorfor ikke bruge galvaniseret rør? **
Galvanized pipe is often avoided for potable water plumbing today primarily due to **corrosion and scale buildup** over time (leading to reduced water pressure and flow), potential **lead contamination** from the zinc coating (especially in older pipes), and **limited lifespan** compared to alternatives like copper, PEX, or CPVC. It's also generally **more expensive** and ** Sværere at arbejde med ** end moderne plastrør .
3. ** Hvornår stoppede vi med at bruge galvaniserede rør? **
The widespread use of galvanized pipes for *new* potable water plumbing in homes **primarily stopped in the 1970s to 1980s**, coinciding with the rise of copper and later plastic (CPVC, PEX) pipes. Many building codes restricted or prohibited new galvanized water lines by the 1980s due to corrosion and lead concerns, though it remained in use for other applikationer (som gaslinjer eller strukturelle anvendelser) og eksisterende systemer vedvarede .
4. ** Er galvaniseret rørrustbevis? **
No, galvanized pipe is **not rust-proof**. It is **rust-resistant**. The zinc coating provides a sacrificial barrier that corrodes *before* the underlying steel rusts, significantly extending its lifespan. However, the zinc coating eventually degrades (especially in acidic, basic, or aggressive Vand/jord), så stålet kan rustes og lækker .
5. ** Hvorfor bruge galvaniseret stål over rustfrit stål? **
Galvanized steel is primarily chosen over stainless steel due to **significantly lower cost**. It offers good corrosion resistance for many non-critical applications (like fencing, handrails, structural supports, outdoor frames, some agricultural uses) where the extreme corrosion resistance of stainless steel is unnecessary. It's also generally **easier to fabricate og svejsning ** (med forholdsregler for zinkdampe) end nogle kvaliteter af rustfrit stål .
