Lub hardness ntawm txias dov steel nyob ntawm ntau yam, nrog rau cov qib tshwj xeeb ntawm cov hlau, cov txheej txheem txias dov, thiab lwm yam kev kho cua sov los yog ua hauj lwm hardening. Cold rolled steel feem ntau paub txog nws cov hardness siab dua li kub dov hlau. Nov yog ob peb lub ntsiab lus tseem ceeb hais txog qhov hardness ntawm txias dov hlau.
Ua hauj lwm hardening: Txias dov yuav txo tau lub thickness ntawm cov hlau nyob rau hauv los yog nyob ze chav tsev kub. Cov txheej txheem deformation no ua rau kev ua haujlwm hardening, uas ua rau muaj zog thiab lub zog ntawm cov hlau. Qhov ntau cov hlau yog txias dov, qhov ntau dua qhov kev ua haujlwm hardening.
Qib: Cov qib txias txias sib txawv muaj qhov sib txawv hardness. Qee qib yog qhov nyuaj dua li lwm tus, thaum lwm tus yog tsim los rau kev tsim kom zoo dua tab sis yuav nyuaj me ntsis.
Annealing: Qee zaum, txias dov hlau yuav tsum tau annealed tom qab txias dov. Annealing muaj cua sov cov hlau mus rau qhov kub thiab txias thiab maj mam txias nws. Annealing txo hardness thiab txhim kho ductility.
Surface Finish: Qhov saum npoo tiav ntawm cov khaub thuas dov hlau kuj cuam tshuam rau nws qhov hardness. Lub steel nrog ib tug du nto yuav muaj ib tug sib txawv hardness faib tshaj ib tug hlau nrog ib tug rougher nto.
Test Method: Lub hardness ntawm steel feem ntau yog ntsuas los ntawm cov tswv yim xws li Rockwell (HRB los yog HRC), Vickers (HV) los yog Brinell (HB). Qhov kev xaiv ntawm txoj kev sim cuam tshuam rau qhov qhia txog tus nqi hardness.
Temper Rolling: Qee qhov txias dov steels tuaj yeem ua rau npau taws, txheej txheem uas txhim kho lub tiaj tus thiab hardness uniformity ntawm cov hlau.
Coatings: Yog hais tias lub saum npoo ntawm txias dov hlau yog coated nrog lwm yam ntaub ntawv, xws li zinc (galvanized) los yog aluminium zinc (galvalume), lub txheej yuav cuam tshuam rau tag nrho cov hardness ntawm cov khoom.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias hardness tsuas yog ib qho khoom ntawm txias dov hlau. Lwm yam khoom siv kho tshuab, xws li lub zog tensile, yield zog thiab ductility, kuj tseem ceeb rau kev siv ntau yam.
