Incoloy 800 vs 800H vs 800HT: Cov ntsiab lus carbon, Grain Size, thiab Creep Strength sib txawv

• Alloy 800, 800H, thiab 800HT sib koom tib lub hauv paus muaj pes tsawg leeg (30–35% Ni, 19–23% Cr, 39.5% Fe min.) tab sis txawv ntawm cov ntsiab lus carbon, aluminium-ntxiv rau-titanium cov ntsiab lus, thiab cov nplej loj - peb lub zog {{12} creep.

• Alloy 800 tsis muaj cov pa roj carbon tsawg kawg (0.10% max.) thiab tsis muaj qhov yuav tsum tau ua loj; nws yog qhov dav dav - qib hom phiaj, tsis yog npaj rau kev nkag siab- kev pabcuam tseem ceeb tshaj 1,500℃F (816℃).

• Alloy 800H nce carbon mus rau 0.05-0.10% thiab yuav tsum muaj cov tshuaj anneal uas ua rau ASTM grain loj ntawm 5 los yog coarser, uas ua rau kom muaj zog creep thiab rupture.

• Alloy 800HT nqaim cov pa roj carbon ntau ntxiv mus rau 0.06-0.10% thiab nce qhov tsawg kawg nkaus Al + Ti mus rau 0.85-1.20%, muab nws qhov siab tshaj plaws tso cai ASME tsim kev ntxhov siab ntawm peb qib, hauv ASME Code Case 1987.

• Rau ntev -lub sij hawm, siab - kub siab- ciam teb Cheebtsam (reformer tubing, ethylene cracking hlab, radiant rauv tubes), 800HT feem ntau yog cov nyiam specification; 800H yog lub hauv paus creep- qib resistant; Plain 800 yog tshwj tseg rau qis dua -kub lossis tsis yog - nkag- kev pabcuam.

Incoloy 800, 800H, thiab 800HTbelongs rau tib lub npib tsib xee- hlau-chromium alloy tsev neeg, tsim los ntawm Special Metals Corporation pib nyob rau hauv 1950s kom xa cov cua sov thiab corrosion kuj yam tsis muaj kev vam khom rau cov ntsiab lus nickel loj uas ua rau INCONEL alloy 600 yog cov khoom siv tsis tshua muaj thaum lub sijhawm. Tag nrho peb qhov sib koom ua ke nominal nickel, chromium, thiab hlau ntau. Dab tsi cais lawv - thiab dab tsi tus kws tshaj lij lossis tus thawj tswj xyuas qhov yuav tsum tau nkag siab - yog cov txheej txheem me me ntawm kev sib xyaw thiab kev siv hlau: cov ntsiab lus carbon, aluminium-ntxiv rau- cov ntsiab lus titanium, thiab cov nplej loj ua tiav los ntawm qhov kawg anneal. Ua ke, cov kev tswj xyuas no txiav txim siab ntau npaum li cas creep thiab kev ntxhov siab- tawg lub zog cov khoom tuaj yeem xa tuaj thaum lub xyoo uas muaj kev kub ntxhov ntau ntxiv - kev pabcuam kub.

Incoloy 800 vs 800H vs 800HT

Kab lus no sib piv tag nrho peb qib ncaj qha, siv qhov txwv cov tshuaj muaj pes tsawg leeg thiab ntev -lub sij hawm tawg- cov ntaub ntawv muaj zog tshaj tawm los ntawm Special Metals Corporation hauv nws cov INCOLOY alloy 800 (SMC-046) thiab INCOLOY alloy 800H & 800HT (SMC-047) kom kho cov kev pab cuam kom raug thiab ntsuas kub kom raug. lub neej.

Tag nrho peb cov alloys sib koom tib yam 30-35% nickel / 19-23% chromium / 39.5% min. hlau puag, tab sis 800H thiab 800HT yog metallurgically hloov kho versions ntawm 800 - ua rau nruj dua carbon thiab txhuas-ntxiv rau-titanium txwv thiab muab siab -kub tshuaj anneal uas loj hlob ib coarser grain qauv, tshwj xeeb tshaj yog rau nce creep thiab kev nyuaj siab{1}{12} ntev zog elevated -kev pabcuam kub.

Tshwj xeeb Metals 'tus kheej cov ntaub ntawv qhia tau meej meej ntawm qhov no: lub hauv paus ntsiab lus nyob rau hauv tag nrho peb alloys yog tib yam, thiab cov alloys 'lub cev thiab thermal zog (density, thermal expansion, hluav taws xob resistivity, modulus ntawm elasticity) yog qhov tseem ceeb zoo tib yam vim hais tias lawv tag nrho compositional ranges sib tshooj. Qhov sib txawv ntawm qhov tseem ceeb yog metallurgical, tsis yog tshuaj lom neeg hauv kev nkag siab dav - lawv txhawj xeeb yuav ua li cas nruj peb qhov tshwj xeeb yog tswj: cov ntsiab lus carbon, aluminium -ntxiv rau- cov ntsiab lus titanium, thiab cov nplej kawg.

Vim li no, alloy 800 feem ntau yog qhov siab dua - lub zog xaiv rau luv luv - lub sij hawm thauj khoom ntawm chav tsev kub lossis nruab nrab kub, thaum 800H thiab 800HT yog qhov kev xaiv raug thaum twg cov khoom yuav tsum tawm tsam lub sij hawm- nyob ntawm deformation (creep) nyob rau hauv lub xyoo ntawm kev sib txuas mus tas li saum toj no roughly 1,000℃F ().

Alloy 800 tso cai rau cov pa roj carbon ntau txog 0.10% tsis muaj qhov tsawg kawg nkaus; alloy 800H xav tau 0.05-0.10% carbon; thiab alloy 800HT nruj uas muaj ntau ntxiv mus rau 0.06–0.10% carbon - ib qho kev nqaim, siab dua hauv pem teb uas yog ib qho loj tshaj plaws rau kev nkag siab - tawg lub zog hauv tsev neeg hlau no.

Cov ntawv xov xwm tshwj xeeb ntawm cov hlau tau sau tseg tias nws tau lees paub ntev dua tias siab dua -carbon alloy 800 muaj qhov nkag siab dua thiab tawg ntau dua li qis- cov khoom siv carbon ntawm tib lub npe nominal, uas yog vim li cas lub tuam txhab pib melting mus rau 0.05–0.10% ntau yam - sab sauv ntawm nws cov qauv tau tso cai rau ntau tshaj 0.10%. tus kheej qib. Cov pa roj carbon nyob rau hauv tsev neeg alloy no precipitates li chromium carbides ntawm cov ciam teb nplej thaum lub sij hawm siab - kub raug; tswj ntawm txoj cai theem thiab grain loj, cov carbides pin lis ciam teb thiab tiv thaiv tus ciam teb zawv zawg uas tsav creep deformation.

Qib	Cov pa roj carbon ntau (%)	UNS npe	Tsim Lub Hom Phiaj
alloy 800	0.10 max. (tsis muaj yam tsawg kawg nkaus)	N08800	General -lub hom phiaj; tsis optimized rau creep
Hlau alloy 800H	0.05 – 0.10	N08810	Creep - thiab rupture - lub zog optimized
Hlau alloy 800HT	0.06 – 0.10	N08811	Qhov siab tshaj plaws tso cai tsim kev ntxhov siab ntawm koob

Source: Special Metals Corporation, INCOLOY alloy 800H & 800HT technical bulletin, Publication No. SMC-047 (Table 1).

Ib qho tseem ceeb nuance rau cov neeg yuav khoom: vim alloy 800's carbon qab nthab (0.10% max.) overlaps tag nrho nrog 800H thiab 800HT ntau yam, lub tshav kub ntawm lub tiaj alloy 800 tau, los ntawm chemistry ib leeg, twb poob rau hauv lub 800H carbon qhov rais. Cov ntsiab lus ntawm cov pa roj carbon ib leeg tsis ua kom muaj cua sov 800H- tsim nyog, txawm li cas los xij - cov qoob loo loj uas tau tham hauv qab no kuj yuav tsum tau ua raws thiab txheeb xyuas.

Alloy 800 tsis muaj qhov yuav tsum tau muaj cov qoob loo loj, thaum ob qho tib si 800H thiab 800HT yuav tsum muaj qhov nruab nrab ASTM nplej loj ntawm No. 5 lossis coarser, ua tiav los ntawm kev daws teeb meem annealing ntawm 2,100–2,200℃F (1,150–1,200 degree) - lub ntsiab lus ntxiv rau kev nyuaj siab ntau ntxiv kub, ntawm qee tus nqi rau kev tshaj tawm - raug toughness.

Why Does Grain Size Matter for Creep Strength

Cov qoob loo loj thiab creep tsis kam yog txuas ncaj qha rau hauv cov txheej txheem alloy no vim tias nkag deformation ntawm qhov kub thiab txias yog tsav los ntawm zawv zawg raws li cov ciam teb. Ib coarser grain qauv muaj proportionally tsawg grain - thaj tsam ntawm ib chav tsev ntim, uas txo txoj kev uas muaj nyob rau hauv ciam teb zawv zawg zawv zawg qhov rooj thiab, nyob rau hauv ua ke nrog nrog carbide pinning, ua rau muaj kev nyuaj siab ib tug tivthaiv yuav txhawb nqa ua ntej nws deforms unacceptably los yog ruptures nyob rau hauv ib tug muab lub neej tsim.

Cov ntawv xov xwm tshwj xeeb ntawm cov hlau tshwj xeeb yog tshwj xeeb txog yuav ua li cas qhov no ua tiav hauv kev tsim khoom: alloys 800H thiab 800HT yog cov tshuaj annealed raws li qib kawg ntawm kev tsim khoom ntawm 2,100–2,200℃F (1,150–1,200 degree), nrog rau lub sij hawm ntawm qhov kub thiab txias kho rau ntu qhov loj me thiab cov yam ntxwv rau qhov cub kom ncav cuag qhov tsawg kawg nkaus qhov nruab nrab ntawm 10M AST.

Cov ntawv xov xwm tseem qhia txog qhov txo qis rov qab thiab qhov cuam tshuam kev lag luam- tawm ncaj qha: qhov kub thiab lub sijhawm yuav tsum tau tswj kom txwv tsis pub cov qoob loo ntau dhau, vim tias me ntsis ntxiv creep zog tau dhau los ntawm qee qhov coarseness, thaum cov nplej ntxhib heev txo qis toughness tom qab siab - kub raug. Rau cov ntawv thov uas ntau tshaj li ntawm 20% txias txias yuav ua raws li, los yog qhov yuav tsum tau ua kom zoo nto tiav, tib daim ntawv tshaj tawm pom zoo kom xaj cov khoom nyob rau hauv ib qho kev nplua - cov qoob loo es tsis txhob, hais tias cov ntxhib - kev kho cov nplej yog ib qho kev pab cuam tshwj xeeb - kev lag luam tshwj xeeb - tawm, tsis yog kev hloov kho thoob ntiaj teb.

Qib	Noob Noob Noob	Anneal Kub	nyhuv
alloy 800	Tsis tau teev tseg	~ 1,800℃F (980 degree) ib txwm anneal	Zoo, dav dav - hom phiaj nplej
Hlau alloy 800H	ASTM Tsis yog . 5 lossis coarser	2,100-2,200 ° F (1,150-1,200 ° F)	Nce creep/rupture kuj
Hlau alloy 800HT	ASTM Tsis yog . 5 lossis coarser	2,100℃F (1,149 degree) yam tsawg kawg nkaus	Nce creep/rupture kuj

Source: Special Metals Corporation, INCOLOY alloy 800H & 800HT technical bulletin, Publication No. SMC-047 (Table 1 and Annealing - Basic Practice section).

Tshwj xeeb (finer lossis coarser) nplej- qhov ntau thiab tsawg - ASTM 1–5 rau phaj thiab raj / yeeb nkab, thiab ASTM 2–5 rau daim ntawv - kuj tuaj yeem pom zoo rau kev txiav txim tshwj xeeb, yog li cov neeg yuav khoom nrog kev sib txawv txawv ntawm kev tsim thiab kev pabcuam yuav tsum qhia meej qhov loj ntawm daim ntawv xaj es tsis yog ASTM 5 tus qauv .

Alloy 800 thiab 800H ob leeg tso cai rau 0.30–1.20% ua ke txhuas ntxiv rau titanium, tab sis alloy 800HT txwv tsis pub sib xyaw ua ke rau qhov nqaim, siab dua 0.85–1.20% - thib peb tswj, nrog rau cov pa roj carbon thiab cov nplej loj, uas Cov Hlau Tshwj Xeeb siv los thawb 800HT 's siab dua.

Cov ntawv xov xwm tshwj xeeb ntawm Cov Hlau piav qhia qhov no ncaj qha raws li kev txiav txim siab lub tswv yim: lub tuam txhab khaws cov khoom txhuas thiab titanium nyob rau sab sauv ntawm qhov kev teev tseg rau nws tus kheej 800H ntau lawm vim tias ua li ntawd ua rau muaj kev nkag siab ntau dua thiab kev ntxhov siab ntau dua - cov khoom tawg yooj yim dua li cov neeg sib tw '800H cov khoom sib ntsib tsuas yog qhov tsawg kawg nkaus. Es tsis txhob tso qhov siab tshaj -qhov kev coj ua raws li qhov kev nyiam sab hauv, Cov Hlau Tshwj Xeeb tau tsim nws rau hauv qhov sib txawv, txwv -chemistry qib - 800HT - nrog qhov yuav tsum tau ua 0.85–1.20% Al+Ti pem teb thiab qab nthab, ntxiv rau 0.06–10.10% qib carbon thiab qib qis tshaj 0.06-10.10, 10% carbon, ntau yam tshuaj-anneal kub tau piav saum toj no.

Vim tias 800HT chemistry qhov rais zaum tag nrho hauv 800H qhov rais, txhua qhov cua sov ua rau 800HT cov kev cai cia li txaus siab rau 800H cov kev cai ib yam nkaus - yog vim li cas 800HT cov khoom yog niaj hnub dual - ntawv pov thawj rau UNS N08811 thiab UNS N088. Qhov kev thim rov qab tsis muaj tseeb: cov khoom siv 800H zoo tib yam tsis tuaj yeem lees paub tias yog 800HT tshwj tsis yog nws tus kheej ua tau raws li cov pa roj carbon nruj dua, Al+Ti, thiab nplej- qhov xav tau loj.

Peb qib sib txawv tsuas yog hauv carbon, aluminium, titanium, thiab grain loj - txhua lwm yam txwv tsis pub muaj cov ntsiab lus (nickel, chromium, hlau, manganese, sulfur, silicon, tooj liab) yog teev nyob rau hauv tag nrho peb.

Element / Requirement	Hlau alloy 800 (N08800)	Hlau alloy 800H (N08810)	Hlau alloy 800HT (N08811)
Nickel	30.0 – 35.0%	30.0 – 35.0%	30.0 – 35.0%
Chromium	19.0 – 23.0%	19.0 – 23.0%	19.0 – 23.0%
Hlau	39.5% min.	39.5% min.	39.5% min.
Cov pa roj carbon	0.10% max.	0.05 – 0.10%	0.06 – 0.10%
Aluminium	0.15 – 0.60%	0.15 – 0.60%	0.25 – 0.60%
Titanium	0.15 – 0.60%	0.15 – 0.60%	0.25 – 0.60%
Aluminium + Titanium	0.30 – 1.20%	0.30 – 1.20%	0.85 – 1.20%
ASTM Grain Loj	Tsis tau teev tseg	5 los yog coarser	5 los yog coarser

Source: Special Metals Corporation, INCOLOY alloy 800H & 800HT technical bulletin, Publication No. SMC-047, Table 1 - Limiting Chemical Compositions for INCOLOY alloys 800, 800H, thiab 800HT.

Alloy 800HT muab qhov ntev tshaj plaws - lub sij hawm nkag mus - tawg lub zog ntawm peb qib, ua raws li 800H; Plain alloy 800 tsis pom zoo los ntawm Cov Hlau Tshwj Xeeb rau cov ntawv thov uas xav tau kev nkag siab zoo tshaj plaws - cov khoom tawg, tshwj xeeb tshaj yog siab dua 1,500℃F (816℃).

Which Alloy Has the Highest Creep-Rupture Strength

Cov Hlau Tshwj Xeeb hais meej meej tias alloy 800H thiab 800HT muaj qhov nkag siab ntau dua thiab tawg lub zog ntau dua li cov hlau 800, thiab cov hlau 800 feem ntau tsis siv qhov zoo tshaj plaws creep - cov khoom tawg yog yuav tsum tau - 800H lossis 800HT yuav tsum tau teev tseg. Qhov qeb duas no tuav tshwj xeeb rau lub sijhawm ntev -ntev, nce siab- qhov kub thiab txias loading; nyob rau hauv chav tsev kub thiab thaum lub sij hawm luv luv -lub sij hawm raug, alloy 800 tuaj yeem pom muaj zog tensile ntau dua 800H lossis 800HT, txij li cov ntxhib{14}} nplej, siab - kub-anneal mob ntawm 800H / 800HT ua lag luam{} lub sij hawm luv luv 20} {19}

Cov lus hauv qab no rov tsim dua Special Metals 'tus neeg sawv cev 10,000-, 30,000-, 50,000-, thiab 100,000-teev rupture-strength qhov tseem ceeb rau alloys 800H thiab 800HT, uas yog kho nyob rau hauv tib cov ntaub ntawv vim hais tias ntawm ib qho chaw tsim khoom tov-anneal grain-loj lub hom phiaj; 800HT's nruj dua carbon thiab Al + Ti chemistry nce nws txoj hauj lwm nyob rau hauv qhov kev ntxhov siab no thiab tau cuam tshuam nyob rau hauv ASME qhov kev tso cai tsim kev ntxhov siab (sib tham hauv ntu tom ntej).

Kub	10,000 h (ksi / MPa)	30,000 h (ksi / MPa)	50,000 h (ksi / MPa)	100,000 h (ksi / MPa)
1,200℃F (650 degree)	17.5 / 121	15.0 / 103	14.0 / 97	13.0 / 90
1,300℃F (705 degree)	11.0 / 76	9.5 / 66	8.8 / 61	8.0 / 55
1,400℃F (760 degree)	7.3 / 50	6.3 / 43	5.8 / 40	5.3 / 37
1,500℃F (815 degree)	5.2 / 36	4.4 / 30	4.1 / 28	3.7 / 26
1,600℃F (870 degree)	3.5 / 24	3.0 / 21	2.8 / 19	2.5 / 17
1,700℃F (925 degree)	1.9 / 13	1.6 / 11	1.4 / 10	1.2 / 8.3
1,800℃F (980 degree)	1.2 / 8.3	1.0 / 6.9	0.9 / 6.2	0.8 / 5.5

Source: Special Metals Corporation, INCOLOY alloy 800H & 800HT technical bulletin, Publication No. SMC-047, Table 7 - Tus Neeg Sawv Cev Rupture-Strength Values for INCOLOY alloys 800H/800HT.

Nyeem cov tswv yim: rupture lub zog ntog tawm sharply nrog ob qho tib si nce kub thiab nce lub neej tsim, uas yog raws nraim li qhov creep-rupture mechanism kwv yees. Cov khoom siv tsim los rau 100,000-teev (kwv yees li 11.4- xyoo) kev pabcuam lub neej ntawm 1,600℃F (870 degree) tuaj yeem nqa tsuas yog li 2.5 ksi (17 MPa) - piv rau 3.5 ksi ntawm tib qhov kub thiab txias.70} lub neej tsim 0 10h Qhov no yog vim li cas sib piv cov qib raug thiab qhov tsim nyog-lub neej kev ntxhov siab tus nqi rau qhov kev khiav hauj lwm qhov kub thiab txias yog qhov tseem ceeb rau kev nyab xeeb, cov cuab yeej siv raws cai hauv cov tsev neeg hlau no, thiab vim li cas tsuas yog nyeem ib qho "qhov kub siab tshaj" tus lej tawm ntawm cov ntaub ntawv tsis yog lub hauv paus tsim tsim rau cov kev pabcuam tsis pub dhau.

Alloy 800HT (ASME Code Case 1987) nqa siab tshaj plaws tsim kev ntxhov siab tshaj alloy 800H (ASME Code Case 1325) hla 1,100–1,650℃F kev pabcuam, uas yog qhov ncaj qha, code- lees paub qhov tshwm sim ntawm 800HT's ntau qhov kev sib tw thiab cov pa roj carbon monoxide ntau dua 800HT txawm qhov twg 800H yuav txwv tsis pub ua raws li qhov yuav tsum tau ua tsawg kawg nkaus.

Raws li ASME Boiler thiab Pressure Vessel Code, alloy 800 tsim kev ntxhov siab rau Tshooj I thiab Tshooj VIII, Division 1 kev tsim kho tau teev ncaj qha rau hauv Tshooj II, Ntu D thiab kev pabcuam npog txog 1,500℃F (816 degree). Alloy 800H's design stresses kuj tau teev nyob rau hauv Tshooj II, Ntu D thiab hais ntxiv los ntawm Code Case 1325 (txog 1,500℃F/816 degree) thiab Code Case 1983 rau Tshooj VIII, Division 1 kev pabcuam txog 1,800℃F (982 degree).

Alloy 800HT qhov siab tshaj plaws uas tau tso cai, them los ntawm Code Case 1987, yog qhov tseeb siab tshaj 800H's thoob plaws 1,100–1,650℃F ntau, thiab cov ntaub ntawv pov thawj raws li 800HT yeej ua tau raws li tag nrho 800H cov kev cai - uas yog vim li cas 11} ob qho tib si UNST{100}{101} N08811 thiab UNS N08810 ntawm daim ntawv pov thawj zeb.

Alloy 800 (N08800) - Tshooj I / Tshooj VIII, Div. 1 & 2 tsim kev ntxhov siab rau ASME II Tshooj D; kev pabcuam rau 1,500℃F (816 degree).
Alloy 800H (N08810) - ASME Code Case 1325 (rau 1,500℃F/816 degree) thiab Code Case 1983 rau Tshooj VIII, Div. 1 kev pabcuam rau 1,800℃F (982℃).
Alloy 800HT (N08811) - ASME Code Case 1987 ( kho tshiab kawg); siab tso cai siab tshaj 800H ntawm 1,100–1,650℃F; kuj tau them rau 1,800℃F (982 degree) ntawm Code Case 1983 qhov tseem ceeb.

Daim ntawv yuav khoom tsim nyog tshaj tawm ncaj ncees: cov ntaub ntawv keeb kwm qhia tau hais tias cov kev ntxhov siab no tau txav mus ua ntej thiab tuaj yeem txav mus ntxiv. Raws li Special Metals 'tus account, thaum ASME Metals Property Council reanalyzed pooled 800H creep -rupture data from 87 heats and 1,052 data point across many producers - including material weaker than Special Metals' own heats - the Code's allowable wards revised the 800H 1,100-1,500℃F (593-816 degree) ntau yam. Qhov ntu ntawd yog qhov tseeb yog vim li cas 800HT muaj nyob ua ke sib cais, nruj dua- qib chemistry: nws cia Cov Hlau Tshwj Xeeb txuas ntxiv muab cov qauv tsim siab dua nws tus kheej cov khoom tuaj yeem txhawb nqa, txhawb nqa los ntawm nws tus kheej cov ntaub ntawv, ywj pheej ntawm kev hloov kho 800H.

Qhia meej meej alloy 800 rau kev xeb dav dav - thiab cua sov- cov kev pabcuam tiv taus qis dua li ntawm 1,500℃F (816 degree) qhov twg creep tsis yog tus qauv tsim; qhia kom meej 800H raws li qib pib qhov twg nkag los- tawg lub zog tswj kev tsim lub neej saum toj no; thiab qhia 800HT qhov twg daim ntawv thov pom zoo rau nws qhov kev tsim qauv siab dua thiab daim ntawv pov thawj UNS dual - feem ntau yog qhov siab tshaj - kub, ntev tshaj plaws -tsim- lub neej siab- thaj tsam thaj tsam.

When Should You Specify Alloy 800 vs 800H vs 800HT

Alloy 800 - rauv pob tawb, tais, thiab khoom siv; Thaum tshav kub kub exchangers thiab piping nyob rau hauv nitric - kua qaub los yog chloride - bearing media qhov twg tsis kam mus rau kev ntxhov siab -corrosion cracking teeb meem ntau tshaj creep lub neej; hluav taws xob cua sov-element sheathing.

Alloy 800H - chav / hydrocarbon hloov pauv catalyst tubing, convection tubing, pigtails thiab qhov hluav taws xob manifolds; ethylene cracking thiab convection tubes; radiant raj, muffles, thiab retorts nyob rau hauv tshav kub- kho rauv; steam-generator thiab superheater tubing.

Alloy 800HT - tib yam creep- qhov tseem ceeb rau qhov cub thiab kev hloov kho daim ntawv thov raws li 800H, tau teev tseg es tsis yog 800H thaum kev xam tsim xav tau ntau dua Code Case 1987 tso cai rau kev ntxhov siab, lossis thaum tus neeg yuav khoom xav tau ob daim ntawv pov thawj N08810/N08811 rau ntau qhov kev ua haujlwm yooj yim.

Nyob rau hauv kev xyaum, feem ntau mills niaj hnub no tsim alloy 800H cov ntaub ntawv rau chemistry thiab grain loj nruj txaus los kuj tsim nyog raws li 800HT, thiab dual-certify nws rau ob UNS tooj ntawm lub zeb xeem daim ntawv qhia - yog li cov neeg yuav khoom yuav tsum nco ntsoov xyuas qhov tseeb MTR chemistry thiab nplej- qhov loj me ntawm qhov kev txiav txim siab tshaj li qhov kev txiav txim siab 10 H. 800HT- theem tsim kev nyuaj siab.

Q: Puas yog Incoloy 800HT tsuas yog qib siab dua ntawm 800H?

A: Tsis yog ib tsev neeg hlau sib cais - 800HT cov khoom muaj pes tsawg leeg yog txwv tsis pub dhau 800H's, ib txwm poob hauv 800H qhov txwv. Qhov txawv yog tias 800HT yuav tsum tau nqaim carbon (0.06–0.10% vs. 0.05-0.10%) thiab siab dua txhuas-plus-titanium (0.85–1.20% vs. 0.30–1.20%) cov ntsiab lus, ntxiv rau 2,100℃carne Ane, thiab 1,100℃F (1,100 degree) tsim kev ntxhov siab nyob rau hauv Code Case 1987.

Q: Alloy 800H puas tuaj yeem hloov pauv rau 800HT ntawm qhov project uas qhia txog 800HT?

A: Tsis yog, tsis tau. Alloy 800HT cov khoom ib txwm ua tau raws li 800H qhov yuav tsum tau ua, yog li nws tuaj yeem ua tau ob- ntawv pov thawj, tab sis qhov rov qab tsis tau lees paub - cov khoom siv 800H zoo tib yam tsuas yog tsim nyog raws li 800HT yog tias nws qhov tseeb chemistry thiab grain loj ntawm nws tus kheej ua tau raws li cov kev txwv nruj dua 800HT. Daim ntawv ntsuam xyuas zeb yuav tsum tau kuaj xyuas.

Q: Puas yog coarser grain loj ua 800H thiab 800HT tsis muaj zog tag nrho?

A: Tsis yog - nws yog kev txhob txwm ua lag luam- tawm ntawm qhov kev taw qhia ntawm qhov "tsis muaj zog" feem ntau cuam tshuam. Coarser grain (ASTM Tsis yog. 5 lossis coarser) txhim kho ntev -lub sij hawm nkag thiab kev ntxhov siab- tawg lub zog ntawm qhov kub siab, uas yog cov cuab yeej cov qib no tau tsim los rau. Kev ua lag luam-tawm yog txo cov tawv nqaij tom qab siab- qhov kub thiab txias thiab qis qis- lub sij hawm chav- qhov kub thiab txias piv nrog nplua - nplej alloy 800, tsis yog tag nrho cov tsis muaj zog.

Q: Qhov kev pab kub siab tshaj plaws rau txhua qib yog dab tsi?

A: Raws li ASME Tshooj I thiab Tshooj VIII, Division 1, alloy 800 raug tso cai rau 1,500℃F (816 degree). Alloy 800H kuj tau teev tseg rau 1,500℃F (816 degree) raws li Code Case 1325, nrog Tshooj VIII, Division 1 kev pabcuam txuas ntxiv mus rau 1,800℃F (982 degree) raws li Code Case 1983. Alloy 800HT's Code Case 1987 stresses npog tib yam li 10 F, 1, 8℃ntau dua. tso cai qhov tseem ceeb, nrog 1,800℃F (982 degree) kev pabcuam kuj tau hais los ntawm Code Case 1983.

Q: Vim li cas tag nrho peb cov alloys muaj qhov tseem ceeb tib yam corrosion kuj?

A: Vim tias npib tsib xee, chromium, thiab hlau - cov ntsiab lus uas tswj oxidation tsis kam, carburization tsis kam, thiab tsis kam rau chloride kev nyuaj siab -corrosion cracking - yog teev nyob rau hauv tag nrho peb qib. Qhov sib txawv ntawm qhov sib txawv ntawm 800, 800H, thiab 800HT raug kaw rau cov pa roj carbon, txhuas, thiab titanium, uas cuam tshuam rau cov khoom siv kho tshuab thiab nkag siab ntau dua li kev coj ua corrosion.

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