進捗
溶融亜鉛めっきとプレ亜鉛めっき鋼: プロセスとコストの違い
真鍮 vs 銅: 金具に使用する金属, バルブと電気?
Brass and copper are both red metals, but they are engineered for different jobs. Copper is pure, soft and conductive — the default for electrical and thermal applications. Brass is a copper-zinc alloy, より強い, harder and easier to machine — the default for fittings, valves and hardware. This guide explains when to choose which.
The Core Difference
銅 (C11000 ETP) is 99.9 % pure copper. It conducts electricity at 101 % IACS and heat at 391 W/m・K, but it is soft (220 MPa 引張) and dents easily. 真鍮 (C26000, C28000) 追加します 30 – 40 % zinc, raising tensile strength to 330 – 450 MPa and making it machinable, but conductivity drops to 25 – 28 % IACS. 要するに: copper carries current and heat, brass carries load and threads. 私たちのを参照してください C11000銅板 と C12200銅管.
| 財産 | 銅 (C11000) | 真鍮 (C36000) |
|---|---|---|
| Composition | 99.9 % 銅 | 60 % 銅, 39 % 亜鉛, 1 % 鉛 |
| 電気伝導率 | 101 % IACS | 26 % IACS |
| 抗張力 | 220 – 360 MPa | 330 – 450 MPa |
| 被削性 | 貧しい (gummy) | 素晴らしい (free-cutting) |
| 耐食性 | 素晴らしい (atmospheric) | 良い (dezincification risk) |
| 一般的な使用方法 | Busbars, チューブ, wire | 継手, バルブ, ハードウェア |
When to Use Which
Use copper for electrical busbars, 変圧器巻線, 接地, water supply tube, refrigeration lines and heat exchangers. If the part carries current or heat, choose copper. Use brass for threaded fittings, valve bodies, pump components, 歯車, bushings and decorative hardware. If the part needs to be machined to tight tolerances, hold a thread, or resist mechanical wear, choose brass. For plumbing, the tube is copper (C12200 DHP) but the fittings and valves are brass — that is the standard combination because the brass fitting is threaded and the copper tube is brazed onto it.
Common Mistakes
The most common error is using brass for electrical conductors because it looks “stronger.” Brass at 26 % conductivity runs hot and wastes energy — always use pure copper for current-carrying parts. The reverse error is using pure copper for valve bodies because it is “more corrosion resistant.” Pure copper is too soft to hold threads under pressure, and it will deform over time. The other risk with brass is dezincification: in aggressive water, the zinc leaches out, leaving porous copper that crumbles. For potable water, specify dezincification-resistant brass (DZR, C352) or use bronze instead.
