Abin da ake neman waɗanda ke sayar da Plate na Carbon Steel?

Fahimtar Abubuwan Da Suka Haɗa da Alatakawa Na Carbon Steel Plate da Noma

Alatakawa Mai Karanci, Tsaron, da Karatu: Farabta Masu Muhimmanci

An rarrabe alatakawa na carbon steel plates base don karbon content, wanda ke tsammanin kai tsankan yadda ya daki gaskiya ga irin aiki da ke iya amfani da shi:

• Alatakawa mai karanci (0.04%–0.30% karbon) yana ba da ductility mai zurfi da weldability mai kyau—wanda ya zama zaɓin farko don tsangayar masu ƙasa, anbuba, da sauya masu haɗi.
• Alatakawa mai tsawon karbon (0.31%–0.60% karbon) yana samar da balance mai mahimmanci na strength, formability, da weldability mai tsokace; ana amfani da shi sosai a cikin axles, gears, da abubuwan rail.
• High-carbon steel (0.61%–1.50% karbon) samunsa kama tsawon tushen da kuma matsawa har ma yasa shi da alkarbaru da kuma iya hada, amma ya sarrafa alkawari da iya hada – an wakilta shi ga sifu, ziziyar, da kayan abubuwa masu daka mai zurfi.

Ƙimiya na Tsarin Fasaha na Carbon Steel da Tasirin Sa

Bayan carbon, abubuwan da aka kiyaye suka hada da alamar farawa:

• Manganese (Mn) (0.30–1.65%) yana ƙara tsauri, iko da kewayon guduwa, kuma taimakawa wajen rage shakatawa a lokacin gudunmu a cikin gudunmu da karkara.
• Phosphorus (P) yana inganta iko mai sauƙi amma yana rage kwayoyin zuwa a tsanyi mai zuwa a ƙarƙashin 0.04%, musamman a cikin kayan dare.
• Sulfur (S) yana inganta rarraba cuta a cikin iko amma yana rage kewayon kari a dutsen da kewayon karkara a ƙarƙashin 0.05%.

Waɗannan abubuwa suna samuwa ta hanyar da ake fahimta: manganese ya haɗa da sulfur don ƙirƙira abubuwan MnS masu amintam, yayin da phosphorus ya fara barce a karkashin sarari zai haɓaka shakatawa. Kiyasin tsarin saukewa – da aka tabbata ta hanyar Tabbatar da Rujukan Mill – yana da mahimmanci ga kayan uku, ayyukan gyara, da kayan da za a iya kuzarti.

Yaya Carbon Content Ya Yi Tasirin Gama-Garin

Karboni ita ce abubuwar tasho mai zuwa ga uku na tsauri–kwayoyin tsauri–kwayoyin haɗa:

• Tsawon kewayowa da kwayoyin tsauri ya gaba da kamatawa ~150 MPa kowace 0.1% karancin karboni saboda karancin girman falurin pearlite da samar da carbide.
• Kwayoyin ya kama taƙai: shayi mai karancin karboni masu yawa su samar da 20–30% elongation; shayi mai karancin karboni suna iya karewa a ≤5%.
• Weldability ta karyawa lokacin da karboni ya karu, ta karya abin da ya kamata martensite ya samuwa a cikin yankin da aka maye (HAZ)—musamman lokacin da ya fi 0.25% C ba tare da preheat ba.
• Samuwar aiki , amma, ta samu girman sa a shayi mai karancin karboni (0.35–0.50% C), inda kwayoyin tsauri da kari da chip-breaking ke kara tsaron cutting da milling.

Wannan alamu ya kawo zahiri: shayi mai karancin karboni don infrastructure da aka haɗa, shayi mai karancin karboni don mesinai da aka dogara kan tsauki, da shayi mai karancin karboni don alatun dake nuna gargadi.

Girman Kayan Kayan Shayi na Karboni: Tsawon Kewayowa, Kwayoyin Tsauri, da Kwayoyin Haɗa

Yield da Tsawon Kewayowa a Kayan Shayi na Karboni

Tsarin kankanta yana nuna farawa a cikin canzawa mai tsawawa; tsarin gurji yana nuna kusurwar wani bodya. Kowannen suke hada da yawan carbon da alamu:

• Fulamataki mai karanci karatu yana da tsari na kankanta a 140–350 MPa kuma tsarin gurji a 280–550 MPa.
• Fulamataki mai karanci karatu suna fitowa zuwa 500–1000 MPa kankanta kuma 700–1500 MPa tsarin gurji—sune ba da damar amfani da kayan aiki mai zurfi ko mai girma a cikin kayan aiki da tamaru.

Takardun Taushe da Kankanta don Samun Nau'inar Aiki Mai Kyau

Iyakar abubuwa ce ya zara ko kawo lafiya ba tare da kalla, wanda ake kira ductility, kuma yau da kullun aka kaiwa ta hanyar yadda za ta iya zara ko kawo lafiya kafin ta kalla. Lokacin da aka talkita hardness, dukkanin mutane suna nuna gwaji game da Rockwell (HRC) ko Vickers (HV), wanda ke nuna mana yadda abubuwa zai samu alkarfi don cuts da wear a cikin lokaci. Madaidaicin carbon yana da mahimmanci a nan. Karshen carbon yana nufin abubuwa mai karfi amma masu karfi, amma karin karanci. Abubuwan irin steel mai karancin carbon tare da karin karancin 20-30% elongation suna aiki kyauta ga abubuwa da suka bukata wasan kawo lafiya, kamar abubuwan sheet metal don juyawa na mota. A wani mataki, abubuwan steel mai karfin carbon suna kawo lafiya ne about 2-5%, wanda ke sauya su ne ideal don abubuwa da suka bukata samun shape a cikin stress, kamar chisels ko springs. Don haka koyaushe daga cikin manyan ingginers suna zaune zuwa zuwa tsakanin abubuwan carbon kamar ASTM A572 Grade 50 steel lokacin da suna son wani abu mai karfi enough don applications structural amma har ma yake iya kawo lafiya a matsayin abubuwa a cikin manufacturing processes.

Tsarin Kwana Mai Tsauri vs. Iyakar Welding: Tacewa A Dabin Haskakewa

Kada ake neman yin ƙwayoyin abubuwa mai tsauri, muna sha hankali da masalolin gina. Fulani mai yawa yana haifar da martensite mai tsauri a cikin yankin da aka yi har, wanda ya sa ya dake da kankanta. Yana faruwa a matsayi kamar yadda ake hana shi, yana kama da har, ko kuma kalmala kalmala hydrogen bayan ake ƙafa. Fulani mai ƙarancin karboni kamar ASTM A36 yana aiki daidai da hanyoyin ƙafa na yau da kullun. Amma yayin da ke da fulani mai yawa, abubuwa suka zama magana. Muna buƙatar tacewa a cikin tallafin daidai kamar yadda muna nuna har yanar gizo daga 150 zuwa 300 daraja Selsus, amfani da electrode mai ƙarancin hydrogen, gudanar da harjin yanzu a cikin tacewa, da nuna tacewar harjin yanzu ga wani abu mai yawa karfi 32 mm. Koda ASME Section IX ya nuna cewa dukkanin wadannan kayan dabe suna buƙatar haka don wani ƙafa da ke tsere dabin. Yana nuna daidai cewa ƙware mai tsauri bai dace ba idan bai iya tabbatar da ƙafar zai datsi a cikin shekara ba.

Tsari na Alkarbaruwa da Standardai na ASTM

A36, A572 Tsari 50/65, da A516 Tsari 70 Ana Kula da Suda

Standardai na ASTM yadda ya kula da alamar aiki a cikin ma'adinai, kayan aiki, da kayan ma'adinai:

• Astm a36 (karboni ≤0.26%, yawan nisa ≤36 ksi) yana ba da rashin saukin haɗawa da kwayoyin kudi don amfani tsaron bayan—mamaki ne don gurje-gurjen gida da abubuwan dawo mara mahimmanci.
• ASTM A572 Tsurare 50/65 (karboni ~0.23%, yawan nisa ≤50/65 ksi) suna ba da matsakaicin girma zuwa kama da girman kayan aiki tare da samun karfin wuya—ana amfani da su a yankin kwallaye, crane, da kayan aiki mai girma.
• ASTM A516 Tsari 70 (karboni ~0.30%, yawan nisa ≤38 ksi, Charpy V-notch ≥27 J a −46°C) yana kama da girman cutar da rashin girman tsarin kwana—wanda ke nuna kayan aiki don ASME Tsarin VIII kayan kanso da maganin rago.

ASTM da ASME Yaye a Kiyaye Carbon Steel Plate

Abubuwan da ASTM ya kara sun tsaya matsayin tushen hanyar yin amfani da kayan aikin, alamar jiki, da kungiyar yanayi. Sai dai kuma, tallafin ASME ta kuskuren II, VIII, da IX wanda yana nufin amshe ayyukan da za a yi don abubuwan da zai iya zamun abin da zai tambayar hankali. Tallaƙon Mill Test Reports ko MTRs suna tsinken bayanin yadda ake tabbatar da wadannan abubuwa. Wadannan tallafoshi na da kayan dake cikin fari - girman karbon, yadda yawa tsauraran zai iya kare shi har sai an barci, da kuma yadda matse ne kan wasan gurji. Nawansu na bayani sun ba da damar in gane abubuwan da ke tsakanin haɗin aikin har sai annobin sa hannu a wurin aikin. Lokacin da ake aiki tare da yanayin sanyi mai zurfi, A516 Grade 70 tana farko saboda ta dace da Charpy V-notch tests har sai an shigar da shi a celsius minus 46. Fari na A36 bai yiwu ba don wannan halayi kuma bai dace da tallafi na ASME Boiler and Pressure Vessel Code ba.

Buƙatar Haɗi: Iyakar Haɗi da Halayen Aiki

Kayan Aiki da Hanyoyin Haɓakawa a Cikin Amfani na Kullum

Iyakar haɗa darumiya suna tare da kimiyyar 'carbon equivalent' (CE) sai dai har zuwa karbar kewayon karbon kusa. Lokacin aiki da darumiya wanda CE ya fi 0.40 kamar A572 Grade 65 ko darumiya A516 wanda aka saita, yawa daga cikin shirye-shiryen haɗa kamar AWS D1.1 da ASME Section IX za su richa wasu nau'ikan gwadawa aƙalla. SMAW da GMAW suna zama abubuwan haɗa masu aiki a yawan wasanai, amma samun sharararwarsa na iya buƙatar sarrafa mai zurfi irin abubuwan da suka shafi gaba daya. Za a buƙata duba inganci na jini, kuma haliyar jini tsakanin rashin, kuma kula da kayan jini hydrogen yana muhimci kuma. Darumiya wanda ke da karbon da fi 0.05% ya kasance mai kankanta lokacin ya ƙurje, wanda shine dalilin waɗannan shirye-shiryen ke nuna kewayon manganese wanda ke da ƙananan 0.80% don kasa kansa. Waɗansu mutane a ASM International suna nuna cewa maɓallin sabin zaƙi na ruwa ke sabbin kamar kwartan kusan duk sarrafar haɗa a ƙasa, yana nuna kyau me ne manhaja mai tsari ke muhimci dibu da kawai zaɓin nau'in darumiya. Ga abubuwan da suka fi girman 32mm wanda suka shiga wurin load mai yawa ko suka shiga stress bayan haɗa, zai zama abubuwa da zarar maimaitowa bayan haɗa don kasa kansa matsalolin da za su faru.

Haɗin Rogi na Kafin Tsabta zuwa Kima da Kima da Ambience

Dokokin ayyukan dole ne su dace da halayen aiki, bai sai kawai su kama da kyau a wani yanar ba. Dole ne a yi amfani da darasi na A516 daraja 70 don tsabar furos - an ziyarce shi saboda yake tafiya lokacin da yankunan yanke sun kara sama da haliyar ruwa, bai sai kawai saboda yake da darajar 38 ksi ba. Don ayyukan karkashin yamma inda keke samun kwayar ruwan yamma, muna talkita game da yawan chloride mai zuwa zuwa 500 ppm. A wannan girman, albarkatu na ilmin korosi babu iya yatsa baki. Dole ne a yi amfani da hanyoyin albarkatu kamar stainless overlays sannan. Lokacin da keke gina jajayya, masu ingginarorin ke nuna darajar Charpy V-notch ta mai zuwa 27 joules a haliyan yanke. Wannan ke taimakawa wajen kula da kuskuretsu mai sauya lokacin da wani abu mai sauƙi ya kasance yayin da wani abu mai girma ke kusa. Kuma ku kula da harshen mai zuwa 425 digiri Selsiyus. Wannan harshen ke kara rashin kuskuren abubuwa. Haka nan yana nufin canza darasin karboni na yau da kullun zuwa wani abu mai zurfi kamar alloys na carbon-molybdenum da aka faɗa a ASTM A204 shine wajib.

Tambayawa inganci da abokin siyayya a cikin siyan Carbon Steel Plate

Tashi Test Reports (MTRs) da tabbatar da inganci

Rahotanni na Gwajin Mill (MTRs) suna da yawa sosai wajibi ne idan ya zo ga aikin kula da inganci. Waɗannan takaddun suna aiki a matsayin hujja ta hukuma cewa kayan sun cika ƙa'idodin ASTM / ASME, suna nuna ainihin lambobi don ƙunshewar carbon, ƙarfin fitarwa, ƙarfin janyewa, da sakamakon gwajin tasiri. Kyakkyawan masu samarwa zasu samar da MTRs da aka danganta kai tsaye zuwa takamaiman batutuwan zafi da lambobin coil don haka injiniyoyi zasu iya bincika idan kayan aiki suna aiki don aikace-aikacen su kafin kowane yankan ko waldi ya faru. Mun ga matsaloli da yawa a wuraren gini inda sassan tsari ko tasoshin matsin lamba ba su da takaddun da suka dace. Ana jinkirta ayyukan, ana bukatar sake gyara abubuwa masu tsada, kuma a wasu lokatai ma ana samun matsala ta doka. Samun tabbacin ɓangare na uku na bayanan MTR, kamar samun dakin gwaje-gwaje na waje don sake duba lambobin, rage raguwar sabis sosai. Wasu binciken kwanan nan a cikin aikin karafa sun nuna cewa irin wannan tabbacin na iya rage haɗarin gazawar da kusan 34% a aikace.

Daidaita Kudin, Samun, da Kuma Ingancin Abubuwa

Kyakkyawan dabarun samar da kayayyaki ya kamata ya yi la'akari da duk farashin rayuwa maimakon mayar da hankali kan abin da wani abu ya kashe a gaba. Karfe mai ƙarancin carbon zai iya adana kusan kashi 15 zuwa 20 cikin ɗari da farko, amma rage ƙayyadaddun bayanai game da bukatun kaya, abubuwan da ke cikin muhalli, ko tsawon lokacin da zai dawwama a ƙarƙashin damuwa na iya haifar da gazawar da wuri, gyare-gyare masu tsada, ko ma yanayi mai haɗari. Abubuwan da aka saba amfani dasu kamar A36 da A572 Grade 50 sun fi dacewa idan kasuwanni suka yi rauni saboda suna samuwa sosai. Yin aiki tare da masana'antun ƙarfe masu lasisi da kuma kiyaye ƙayyadaddun bayanai don karɓar madadin daidai yana taimakawa ci gaba da samar da kayayyaki ba tare da sadaukar da inganci ba. A ƙarshen rana, kayan da ke da tasiri ba dole ba ne mafi kyawun zaɓi amma wanda ke ci gaba da aiki daidai a duk tsawon rayuwarsa, wanda aka tallafawa ta cikakkun bayanan da ke nuna daidaitattun abun da ke ciki da kuma halayen aikin da aka tabbatar.

Sashen Tambayoyi

Menene nau'ikan nau'ikan farantin karfe na carbon?

Carbon karfe faranti zo a low, matsakaici, da kuma high carbon grades, kowane miƙa musamman Properties dace da daban-daban aikace-aikace. Karfe mai ƙarancin carbon yana ba da babban ductility da waldability mai kyau, matsakaiciyar ƙarfe mai carbon yana ba da daidaituwa tsakanin ƙarfi da ƙira, kuma ƙarfe mai ƙarancin carbon yana ba da iyakar taurin.

Ta yaya carbon abun ciki rinjayar da yi na karfe?

Abubuwan da ke cikin carbon sun fi rinjayar ƙarfin, ductility, welding, da kuma machinability. Karin carbon yana kara ƙarfi da taurin amma yana rage ductility da waldability, yana sa zaɓi ya zama mahimmanci bisa ga bukatun aikace-aikacen.

Me ya sa waldability da muhimmanci ga carbon karfe faranti?

Welding yana da mahimmanci saboda yana shafar sauƙin ƙerawa da amincin tsari. Babban abun cikin carbon na iya haifar da ƙarancin tsari yayin walda, yana buƙatar takamaiman fasahohin walda don tabbatar da ƙarfi, haɗin gwiwa.

Menene Rahoton Gwajin Mill (MTRs) a cikin sayan ƙarfe?

Rahoton Gwajin Mill (MTRs) suna tabbatar da bin ƙa'idodin ASTM / ASME kuma suna tabbatar da kaddarorin kayan kamar abun cikin carbon da ƙarfi, tabbatar da ƙarfe ya cika ƙayyadaddun abubuwan da ake buƙata don aikace-aikacen da aka nufa.