Ob qhov suab paj nruag yog ob qho tib si ntaus thiab tau siv ntau txoj hauv kev sib txuam. Yog li cas cov teeb meem yuav tsum tau them rau koj thaum lub sijhawm siv?
Feem ntau, nws yog ib qho tseem ceeb kom paub meej tias lub kauj pauj ob lub suab yuav txuag lub zog thiab ua haujlwm zoo, dawb tom thiab tom; txo cov kev cuam tshuam thiab hu rau kev nyuab siab thaum lub qhov txuas thiab lub ntsej muag hlawv; thiab qhov loj nrug cov saw pitch tau nce vim yog hnav. Muaj peev xwm los pab ua haujlwm. Yog tias cov khoom hnyav tsis zoo, nws yuav ua rau hnav thiab kua muag tau yooj yim. Yog li ntawd, 45 # hlau siv tau, uas muaj quenched thiab tempered hardness ntawm HRC 40-45, uas yog, kev kho tshav kub ua rau lub zog hardness.
