Spot tallace-tallace na 40Cr karfe bututu don sarrafawa
40Cr karfe bututu ne irin zagaye karfe da m sashe kuma babu gidajen abinci a kusa da. Ana yin shi da ƙaƙƙarfan bututu mara kyau ta hanyar ɓarna, sannan a yi shi da jujjuyawar zafi, jujjuyawar sanyi ko zane mai sanyi. Idan aka kwatanta da karfen zagaye da sauran karfen karfe, lokacin lankwasawa da karfin juzu'i iri daya ne, nauyin bututun karfe yana da sauki, wanda nau'in karfe ne na bangaren tattalin arziki.
Dangane da GB / T 3077-2008: abun da ke ciki na sinadarai (jashi mai yawa,%) C 0.37 ~ 0.44, Si 0.17 ~ 0.37, Mn 0.50 ~ 0.80, cr0.80 ~ 1.10, Ni ≤ 0.30【 Mechanical Properties]
Samfura mara girman (mm): 25
Zafin zafi na farkon quenching (℃): 850; Coolant: mai
Na biyu quenching dumama zafin jiki (℃):
Tempering dumama zafin jiki (℃): 520; Coolant: ruwa, mai
Ƙarfin ƙarfi (σ b/MPa): ≧980
Matsayin Haɓaka (σ s/MPa): ≧785
Tsawaitawa bayan karaya (δ 5/%): ≧9
Rage yanki (ψ/%): ≧45
Ƙarfin shayar da tasiri (aku2 / J): ≥ 47
Brinell taurin (hbs100/3000) (annealed ko babban zafin jiki): ≤ 207
A misali karfe maki na GB a kasar Sin ne 40Cr, Din abu No. 1.17035 / 1.7045, DIN 41Cr4 / 42gr4, en 18, BS 41Cr4, AFNOR 42c4, NF 38cr4 / 41Cr4, jami'a 41Cr4, NbN 42cr4, SS 2245 American Aisi / Sae / ASTM Standard Karfe No. 5140, Jafananci JIS misali karfe No. scr440 (H) / scr440, American AISI / SAE / ASTM Standard Karfe No. 5140, kasa da kasa kungiyar for Standardization ISO misali karfe No. 41Cr4.
(kimanin) ACM = 780 ℃
Zazzabi 850 ~ 870 ℃, taurin 179 ~ 229hbs.
Zazzabi shine 740 ~ 760 ℃, lokacin riƙewa shine 4 ~ 6h, sannan ana sanyaya zafin jiki zuwa ≤ 600 ℃ a ƙimar sanyaya na 5 ~ 10 ℃ / h.
Taurin kafin magani ≤ 217hbs, taurin bayan laushi ≤ 163hbs.
(670 ± 10) ℃ × 2H, zafin jiki Yunƙurin tare da tanderun, (710 ± 10) ℃ × 2H, kwantar da hankali tare da tanderun, (670 ± 10) ℃ × 2H, zazzabi tashi tare da tanderun, (710 ± 10) ℃ × 2H, sa'an nan kuma rage yawan zafin jiki tare da tanderun, (670 ± 10) ℃ × 2H, zafin jiki tashi tare da tanderun, (710 ± 10) ℃ × 2H, kwantar da hankali tare da tanderun for 3 hawan keke, sa'an nan kwantar da hankali zuwa 550 ℃ don sanyaya iska. Taurin bayan magani shine 153hbs.
Quenching zafin jiki 850 ℃ ± 10 ℃, mai sanyaya; Tempering zafin jiki 520 ℃± 10 ℃, ruwa, mai da iska sanyaya.
Matsakaici carbon modulated karfe, sanyi kan gaba mutu karfe. Karfe yana da matsakaicin farashi da sauƙin sarrafawa. Bayan maganin zafi mai dacewa, zai iya samun wasu tauri, filastik da juriya. Normalizing zai iya inganta spheroidization na nama da kuma inganta yankan aikin na blanks tare da taurin kasa da 160hbs. Tempered a 550 ~ 570 ℃, da karfe yana da mafi kyau m inji Properties. Hardenability na wannan karfe ya fi na karfe 45. Ya dace da jiyya mai taurin ƙasa kamar babban mitar quenching da kashe wuta.
Bayan quenching da tempering, wannan karfe da aka yi amfani da kerarre inji sassa hali matsakaici load da matsakaici gudun, kamar tuƙi ƙugiya, raya rabin shaft na mota, gear, shaft, tsutsa, spline shaft, tsakiyar hannun riga, da dai sauransu a kan inji kayan aiki; Bayan quenching da matsakaicin zafin jiki tempering, ana amfani da shi don kera sassan da ke ɗauke da babban nauyi, tasiri da matsakaicin sauri, kamar gear, babban shaft, rotor famfo mai, shinge mai zamiya, abin wuya, da sauransu; Bayan quenching da ƙananan zafin jiki na zafi, ana amfani da shi don kera sassa tare da nauyi mai nauyi, ƙananan tasiri, juriya da ƙaƙƙarfan kauri ƙasa da 25mm akan sashin, kamar tsutsa, babban shaft, shaft, abin wuya, da dai sauransu; Bayan quenching da tempering da high-mita surface quenching, ana amfani da su tsirar sassa da high surface taurin da kuma sa juriya ba tare da babban tasiri, kamar kaya, hannun riga, shaft, babban shaft, crankshaft, spindle, fil, haɗa sanda, dunƙule, goro, bawul mai shiga, da dai sauransu Bugu da ƙari, wannan ƙarfe kuma ya dace da kera sassa daban-daban na watsawa da ake bi da su ta hanyar carbonitriding, irin su gears da shafts tare da babban diamita da ƙananan zafin jiki mai kyau.
Annealed, taurin ≤ 207hbs. 40Cr na roba modulus: na roba modulus E (20 ℃) / MPA 200000 ~ 211700, karas modulus G (20 ℃) 80800
Tsarin kashe 40Cr
40Cr quenching, 850 ℃, mai sanyaya; Tempering 520 ℃, sanyaya ruwa, mai sanyaya. The surface quenching taurin na 40Cr karfe bututu ne hrc52-60, da kuma harshen wuta quenching iya isa hrc48-55.
40Cr nitriding magani
40Cr na da nitrided karfe ne, kuma abubuwan da ke cikinsa suna da amfani ga nitriding. 40Cr iya samun mafi girma surface taurin bayan nitriding magani, da kuma mafi girma taurin bayan nitriding magani iya isa hra72 ~ 78, watau hrc43 ~ 55. Nitriding workpiece tsari hanya: forging annealing m machining quenching da tempering gama machining danniya kau m nika nitriding gama nika ko niƙa. Saboda nitrided Layer na bakin ciki ne kuma gaggautsa, shi ake bukata don samun wani high-ƙarfi core tsarin, don haka wajibi ne don gudanar da quenching da tempering zafi magani da farko don samun tempered sorbite da inganta inji Properties na core da kuma ingancin. Layer na nitrided. Nitriding mai laushi yana aiki nitriding, kuma ana amfani da nitriding iskar gas akai-akai
40Cr walda
Kafin waldawar 40Cr, kula da preheating don hana quench crack a cikin walda saboda matrix zafi dissipation. Zai fi dacewa don daidaitawa kafin waldawa.
Weldability na 40Cr: yana da sauƙin rarrabewa yayin crystallization kuma yana kula da fashewar crystallization (wani nau'in fashewar thermal). Yana da sauƙi a fashe a cikin ramuka da ɓangarori a cikin walda yayin walda. Tare da babban abun ciki na carbon, yana da sauƙi don samun tsari mai tauri (martensite) wanda ke da matukar damuwa ga fashewar sanyi a lokacin sanyi mai sauri. Lokacin da yawan sanyaya yanki mai zafi ya yi girma, yana da sauƙi a samar da babban carbon martensite mai ƙarfi da gatsewa da ƙwanƙwasa yanki mai zafi.
1. Ana yin walda gabaɗaya a cikin yanayin da ba a daidaita ba.
2. Hanyar walda ba ta da iyaka
3.Za'a iya ƙara yawan zafin jiki mai zafi da kyau tare da babban ƙarfin layi. Gabaɗaya, ana iya sarrafa zafin jiki na preheating da zafin jiki tsakanin 250 ~ 300 ℃.
4. Kayan walda zai tabbatar da cewa abun da ke tattare da karfen da aka ajiye ya kasance daidai da na karfen tushe, kamar j107-cr.
5.Quenching da tempering zafi magani za a za'ayi a cikin lokaci bayan waldi. Idan yana da wuya a aiwatar da quenching da tempering magani a cikin lokaci, matsakaici annealing ko rike a zazzabi sama da preheating na wani lokaci za a iya za'ayi don kawar da diffused hydrogen da taushi tsarin. Don samfuran da ke da sarƙaƙƙiya tsari da walƙiya da yawa, ana iya yin ɓarnar tsaka-tsaki bayan walda wani adadin welds.
