?url_ver=Z39.88-2004&rft_id=1015021014&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=SIFAT+KEKERASAN+DAN+KOMPOSISI+KIMIA+PERMUKAAN+BAJA+ST41+HASIL+PROSES+PACK+CARBURIZING+MENGGUNAKAN+ARANG+CANGKANG+BUAH+KETAPANG+SEBAGAI+MEDIA+KARBON+PADAT&rft.creator=SINGGIH+TRENGGONO%2C+1015021014&rft.subject=Mesin+(General).+Mesin+Sipil+(General)&rft.description=Baja+karbon+rendah+(ST41)+adalah+jenis+baja+konstruksi+yang+mempunyai+kandungan+karbon+dibawah+0%2C3%25+memiliki+ferrite+yang+lebih+banyak+dibandingkan+pearlite+dengan+tensile+strength+(kekuatan+tarik)+sebesar+40+kg%2Fmm2.+Akan+tetapi%2C+baja+karbon+rendah+mempunyai+kelemahan+kualitas+kekerasan+yang+rendah.Salah+satu+cara+meningkatkan+kualitas+kekerasan+baja+karbon+rendah+dengan+dilakukannya+proses+pack+carburizing.+Tujuan+dari+penelitian+ini+adalah+untuk+mengetahui+pengaruh+variasi+waktu+penahanan+dengan+temperatur+konstan+pada+proses+pack+carburizing+ditinjau+dari+nilai+kekerasan+dan++komposisi+kimia+baja+ST41.+Proses+pack+carburizing+ini+menggunakan+variasi+waktu+penahanan+30+menit%2C+45+menit%2C+dan+60+menit+dengan+temperatur+konstan+850%E2%84%83.+Penelitian+ini+menggunakan+arang+cangkang+buah+ketapang+sebagai+karbon+aktif+dan+cangkang+telur+sebagai+katalisator.+Pendinginan+dilakukan+dengan+prosesquenchingmenggunakan+media+air.+Pengujian+yang+dilakukan+adalah+uji+kekerasan+micro+vickers+dan+uji+komposisi+kimia.+Hasil+penelitian+menunjukkan+bahwa+proses+pack+carburizing+dapat+meningkatkan+nilai+kekerasan+baja+ST41.+Nilai+kekerasan+pada+baja+sebelum+proses+pack+carburizing+adalah+137%2C4+HV%2C+setelah+dilakukan+proses+pack+carburizingdengan+peningkatan+nilai+kekerasan+tertinggi+pada+saat+waktu+penahanan+60+menitsebesar+216%2C4+HV.+nilai+kekerasan+meningkat+seiring+dengan+semakin+lamanya+waktu+penahanan.+Dari+hasil+uji+komposisi+kimia+dapat+diketahui+bahwa+kandungan+karbon+pada+baja+meningkat+setelah+dilakukan+proses+pack+carburizing.+Kandungan+karbon+pada+baja+sebelum+proses+pack+carburizing+sebesar+0%2C115+(wt.%25)%2Csetelah+dilakukan+proses+pack+carburizing+dengan+peningkatan+kandungan+karbon+tertinggi+pada+saat+waktu+penahanan+60+menit+sebesar+0%2C353+(wt.%25).+Semakin+lama+waktu+penahanan+saat+karburasi+maka+jumlah+kandungan+karbon+pada+baja+semakin+meningkat%2C+seiring+Semakin+meningkatnya+jumlah+kandungan+karbon+maka+baja+akan+mempunyai+sifat+yang+lebih+keras.%0D%0AKata+kunci+%3A%09baja+karbon+rendah+(ST41)%2Cpack+carburizing%2C+waktu+penahanan%2C+uji+kekerasan%2C+uji+komposisi+kimia.%0D%0A%0D%0A%0D%0A%0D%0A%0D%0AABSTRACT%0D%0A%0D%0ALow+carbon+steel+(ST41)+is+kind+construction+steel+which+has+acarbon+content+below+0%2C3+%25+has+more+ferrite+than+pearlite+with+tensile+strengthof+40+kg%2Fmm2.However%2C+low+carbon+steel+has+debility+like+low+quality+of+hardness.+One+way+toincrease+the+hardness+qualityof+low+carbon+steel+by+usedpack+carburizing+process.+The+purpose+of+this+research+is+to+determine+the+effect+of+holding+time+on+variation+with+the+temperature+constantof+pack+carburizing+process+reviewed+from+value+of+the+hardness+and+chemical+composition+of+the+steel+ST41.+The+pack+carburizing+process+used+30+minutes%2C+45+minutes+and+60+minutes+variations+of+holding+time+while+the+temperature+constant+was+at+850+%E2%84%83.+this+research+used+charcoal+ketapang+shell+as+activated+carbon+and+egg+shell+as+catalyst.+Cooling+was+done+by+quenching+process+used+water+media.+This+experiment+was+micro+vickers+hardness+examination+and+chemical+composition+examination.+The+result+of+the+research+is+showed+that+the+pack+carburizing+process+can+increase+the+hardness+value+of+steel+ST41.+Hardness+value+before+being+processingpack+carburizing+steel+was+137%2C4+HV%2C+after+donea+pack+carburizing+process+with+increasedthe+highest+hardness+during+holding+time+of+60+minutes+which+equal+to+216%2C4+HV.+Hardness+value+increases+with+the+length+holding+time.+Chemical+composition+of+the+test+results+also+showed+that+the+content+of+the+carbon+steel+increased+after+pack+carburizing+process.+Carbon+contentbefore+processing+pack+carburizing+steel+was0%2C115+(wt.%25)%2C+after+done+a+pack+carburizing+process+with+increased+the+highest+carbon+content+during+holding+time+of+60+minutes+which+equal+to+0%2C353+(wt.%25).The+longer+the+holding+time+during+carburizingthen+The+amount+of+carbon+content+in+steel+increases%2C+along+with+the+increasing+amount+of+carbon+contentthenthe+higher+of+steel+hardness+will+be.%0D%0A%0D%0AKeywords+%3A+low+carbon+steel+(ST41)%2C+pack+carburizing%2C+holding+time%2C+hardness+test%2C+test++of+chemical+composition.&rft.publisher=UNIVERSITAS+LAMPUNG&rft.date=2018-05-03&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F32861%2F1%2FABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F32861%2F2%2FSKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F32861%2F3%2FSKRIPSI%2520TANPA%2520BAB%2520PEMBAHASAN.pdf&rft.identifier=++SINGGIH+TRENGGONO%2C+1015021014++(2018)+SIFAT+KEKERASAN+DAN+KOMPOSISI+KIMIA+PERMUKAAN+BAJA+ST41+HASIL+PROSES+PACK+CARBURIZING+MENGGUNAKAN+ARANG+CANGKANG+BUAH+KETAPANG+SEBAGAI+MEDIA+KARBON+PADAT.++UNIVERSITAS+LAMPUNG%2C+FAKULTAS+TEKNIK.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F32861%2F