1. Manganese; Nws tuaj yeem txhim kho lub zog ntawm cov hlau, ua kom tsis muaj zog thiab tshem tawm qhov tsis zoo ntawm cov sulfur, thiab txhim kho cov hardenability ntawm steel. High alloy steel (high manganese steel) nrog cov ntsiab lus siab manganese muaj kev hnav zoo thiab lwm yam khoom siv lub cev.
2. Silicon; Nws tuaj yeem txhim kho cov tawv tawv ntawm cov hlau, tab sis cov plasticity thiab toughness raug txo. Cov hlau hluav taws xob muaj qee qhov nyiaj ntawm silicon, uas tuaj yeem txhim kho cov khoom sib nqus mos.
3. Tungsten; Nws tuaj yeem txhim kho cov xim liab thiab thermal zog ntawm cov hlau, thiab txhim kho qhov hnav tsis kam ntawm cov hlau.
4. Chromium; Nws tuaj yeem txhim kho lub hardenability thiab hnav tsis kam ntawm steel, thiab txhim kho corrosion kuj thiab oxidation tsis kam ntawm hlau.
