Chemical composition ntawm railway steel rail
Rail steel yog tsim los ntawm ntau cov tshuaj tseem ceeb uas yog Fe, C, Mn, Si, P, S, thiab lwm yam.
A. Yog hais tias C nce, tensile lub zog, abrasion tsis kam thiab hardness ntawm rail hlau yuav kuj nce tab sis toughness txo.
B. Yog hais tias Mn nce, tensile lub zog thiab toughness ntawm rail steel kuj yuav nce. Yog tias tshem cov hlau thiab sulfur, cov hlau manganese siab yuav tsum muaj kev hnav zoo.
C. Yog hais tias Si yog ua ke nrog O, rail hlau yuav tsum tshem tawm npuas thiab ua kom ceev. Yog tias Si nce ntxiv, rail hlau yuav tsum muaj kev hnav zoo.
D. P ua rau cov hlau rail muaj qhov txias brittleness.
E. S tsis yaj hauv Fe, uas muaj nyob rau hauv daim ntawv ntawm hlau sulfide, nws ua rau rail steel muaj kub brittleness.
(2) Mechanical kev ua tau zoo ntawm railway steel rail
Mechanical zog ntawm rail steel muaj xws li lub zog limitationσb, yield limitationσs, qaug zog limitationσr, elongationδ5, seem shrinkageψ, toughness h thiab hardness.