Perbedaan antara karbon dan baja.
1. Tungsten steel: the finished products contain about 18% tungsten alloy steel, tungsten steel belongs to the hard alloy, also known as tungsten titanium alloy. The hardness is 10K, second only to diamond. Because of this, tungsten steel commodity (see more tungsten steel watch), with the characteristics of not easy to be worn. It is often used on lathe tools, percussion drill bits, glass cutting head, and ceramic tile cutting knife.

2. Carbide: to cemented carbide powder metallurgy field and metal-ceramic metal carbide (WC, TaC TiC, NBC, etc.) or metal oxide (such as Al2O3, ZrO2, etc) as the primary ingredients, in just the right amount of metal powder (Co, Cr, Mo, Ni, Fe) made by powder metallurgy method, has the qualities of some metal ceramics. Cobalt (Co) is used to bond the alloy. During sintering, it encloses tungsten carbide (WC) powder and binds it tightly together. General content: 3%--30% tungsten carbide (WC) is the primary component of some metallic properties of this carbide or cermet, 70%-- 97% (component ratio) is widely used for wear resistance, high-temperature resistance, corrosion resistance, harsh working conditions of parts or tool, tool head. Tungsten steel is attributed to the hard alloy, but the hard alloy is tungsten steel is different, nowadays the customer of Taiwan and southeast Asia country likes to use tungsten steel this word, if talk with them carefully thorough, can discover, the majority still is to point to hard alloy.
Perbedaannya antara baja alpha dan baja yang keras adalah baja berkecepatan tinggi yang juga dikenal sebagai baja berkecepatan tinggi atau baja alat yang dilebur dengan teknik alpha dan besi, alias baja berkecepatan tinggi atau baja peralatan yang kadarnya biasanya 15-25 persen. Paduan keras terbuat dari tungau karbonasi dengan arsenik atau logam lengket lainnya yang dibakar melalui teknik metalurgi bubuk, yang biasanya memiliki kadar beta di atas 80 persen.
Arief mengatakan bahwa apa pun yang memiliki tingkat kekerasan melebihi HRC65, selama paduan dapat disebut dengan paduan yang keras, baja alfa merupakan paduan keras antara HRC 85-92, yang sering digunakan sebagai alat non tolokratis dan takaran.