ASTM A178 Cov khoom lag luamsteel hlab yog hluav taws xob tsis kam welded (ERW) hlab ntawmcarbon thiab carbon-manganese hlausiv los ua boiler raj, boiler flues, superheater flues, thiab kev ruaj ntseg xaus.
Nws yog tsim rau steel tubes nrog ib tug sab nraud txoj kab uas hla ntawm 12.7-127mm thiab phab ntsa thickness ntawm 0.9-9.1mm.
ASTM A178 cov hlab ntsha yog tsim rau cov kav hlau tsis muaj zog nrogSab nraud diameters ntawm 1/2 - 5 hauv [12.7 - 127 mm] thiab phab ntsa thicknesses ntawm 0.035 - 0.360 hauv [0.9 - 9.1 mm], txawm tias lwm qhov ntau thiab tsawg yog qhov tseeb muaj raws li qhov yuav tsum tau ua, muab cov raj no ua tau raws li tag nrho lwm cov kev cai ntawm qhov kev qhia tshwj xeeb no.
Muaj peb qib los tiv thaiv ib puag ncig kev siv sib txawv.
Qib A, Qib C, thiab Qib D.
| Qib | Carbon Steel Hom |
| Qib A | Tsawg-Carbon Steel |
| Qib C | Nruab nrab-Carbon Steel |
| Qib D | Carbon-Manganese hlau |
Cov khoom uas muaj nyob rau hauv qhov kev qhia tshwj xeeb no yuav tsum ua raws li qhov yuav tsum tau ua ntawm tam sim no tsab ntawm Specification A450 / A450M.tshwj tsis yog tias muaj lwm yam hauv no.
Qib AthiabQib Ctsis qhia meej txog cov hlau tshwj xeeb;xaiv cov khoom siv raw raws li xav tau.
Steel rauQib Dyuav raug tua.
Cov hlau tua yog tsim los ntawm kev ntxiv deoxidizers (xws li, silicon, aluminium, manganese, thiab lwm yam) rau molten steel thaum lub sij hawm tsim cov hlau, yog li txo lossis tshem tawm cov pa oxygen ntawm cov hlau.
Qhov kev kho no txhim kho cov homogeneity thiab ruaj khov ntawm cov hlau, txhim kho nws cov khoom siv kho tshuab, thiab txhim kho corrosion kuj.
Yog li ntawd, cov hlau tua tau siv dav hauv cov ntawv thov uas yuav tsum muaj qib siab ntawm homogeneity thiab cov cuab yeej zoo heev, xws li kev tsim cov hlab ntsha siab, boilers, thiab cov khoom siv loj.
Cov raj steel yog tsim los ntawm kev siv lub tshuabERWkev tsim khoom.
ERW (Electric Resistance Welded)yog cov txheej txheem tsim nyog rau kev tsim cov pa roj carbon steel yeeb nkab.
Nrog rau qhov zoo ntawm lub zog vuam siab, du sab hauv thiab sab nrauv, kev tsim khoom ceev ceev, thiab tus nqi qis, nws yog dav siv nyob rau hauv ntau yam kev lag luam thiab kev tsim kho.
ASTM A178 Cov khoom lag luamcev steelyuav tsum tau kho cua sovthaum lub sij hawm kev tsim khoom.Nws yog siv los txhim kho cov khoom siv kho tshuab thiab cov qauv kev ruaj ntseg ntawm cov yeeb nkab, nrog rau kev tshem tawm cov kev ntxhov siab uas yuav tau qhia thaum lub sij hawm vuam txheej txheem.
Tom qab vuam, tag nrho cov raj yuav tsum tau kho cua sov ntawm qhov kub ntawm 1650 ° F [900 ° C] los yog siab dua thiab ua raws li cua txias los yog nyob rau hauv lub txias chamber ntawm ib tug tswj-kub cua sov.
Cov tubes txias txiasyuav tsum tau kho cua sov tom qab qhov kawg txias-draw dhau ntawm qhov kub ntawm 1200 ° F [650 ° C] lossis siab dua.
Thaum soj ntsuam cov khoom lag luam, qhov zaus ntawm kev tshuaj xyuas yog txiav txim raws li hauv qab no.
| Kev faib tawm | Kev soj ntsuam zaus |
| Sab nraud txoj kab uas hla ≤ 3in [76.2mm] | 250 pcs / lub sijhawm |
| Sab nraud txoj kab uas hla ＞ 3in [76.2mm] | 100 pcs / lub sijhawm |
| Distinguishes los ntawm tube cua sov tooj | Rau tus naj npawb cua sov |
Cov cuab yeej cuab tam yuav tsum tsis txhob siv rau tubing me dua 1/8 nyob rau hauv.
1. Tensile Property
Rau cov chav kawm C thiab D, ib qho kev ntsuas tensile yuav tsum tau ua ntawm ob lub raj hauv txhua qhov ntau.
Rau Qib A tubing, kev ntsuas tensile tsis yog ib txwm xav tau.Qhov no yog vim qhov tseeb tias Qib A tubing feem ntau yog siv rau kev siv qis thiab qis kub.
Table 3 muab qhov xam qhov tsawg kawg nkaus elongation qhov tseem ceeb rau txhua 1/32 in. [0.8 mm] txo cov phab ntsa thickness.
Yog tias cov phab ntsa tuab ntawm cov yeeb nkab steel tsis yog ib qho ntawm cov phab ntsa thicknesses, nws kuj tuaj yeem raug xam los ntawm cov qauv.
Ib nti: E = 48t + 15.00los yogISI Units: E = 1.87t + 15.00
E = elongation hauv 2 nti lossis 50 mm, %,
t = tiag specimen thickness, in. [mm].
2. Crush Test
Extrusion xeem yog ua nyob rau hauv cov yeeb nkab seem 2 1/2 ntiv tes [63 mm] nyob rau hauv ntev uas yuav tsum tiv taus longitudinal extrusion yam tsis muaj cracking, splitting, los yog splitting ntawm lub welds.
Rau tubing tsawg dua 1 in. [25.4 mm] nyob rau sab nraud txoj kab uas hla, qhov ntev ntawm cov qauv yuav tsum yog 2 1/2 npaug ntawm txoj kab uas hla sab nraud ntawm lub raj.Kev tshuaj xyuas me ntsis saum npoo yuav tsis ua rau kev tsis lees paub.
3. Kev xeem Flattening
Txoj kev sim ua raws li cov kev cai ntawm ASTM A450 Tshooj 19.
4. Flange Test
Txoj kev sim ua raws li cov kev cai ntawm ASTM A450 Tshooj 22.
5. Rov qab Flattening Test
Txoj kev sim ua raws li cov kev cai ntawm ASTM A450, Tshooj 20.
Kev ntsuas hluav taws xob hydrostatic lossis tsis muaj kev puas tsuaj yog ua rau ntawm txhua cov yeeb nkab steel.
Cov kev xav tau yog raws li ASTM A450, Tshooj 24 lossis 26.
Cov ntaub ntawv hauv qab no yog muab los ntawm ASTM A450 thiab ua tau raws li qhov yuav tsum tau muaj rau welded steel yeeb nkab nkaus xwb.
Qhov hnyav sib txawv
0 - + 10%.
Phab ntsa Thickness Deviation
0 - +18%.
Sab nraud Diameter Deviation
| Sab nraud txoj kab uas hla | Permissible Variations | ||
| in | mm | in | mm |
| OD ≤1 | OD≤ 25.4 | ± 0.004 | ± 0.1 |
| 1＜OD ≤1½ | 25.4＜OD ≤38.4 | ± 0.006 | ± 0.15 |
| 1½＜OD＜2 | 38.1 OD 50.8 | ± 0.008 | ± 0.2 |
| 2≤ OD＜2½ | 50.8≤ OD＜63.5 | ± 0.010 | ± 0.25 |
| 2 ½ ≤ OD＜3 | 63.5≤ OD＜ 76.2 | ± 0.012 | ± 0.30 |
| 3 ≤ OD ≤ 4 | 76.2≤ OD ≤101.6 | ± 0.015 | ± 0.38 |
| 4＜OD ≤ 7½ | 101.6＜OD ≤190.5 | -0.025 - 0.015 | -0.64 - 0.038 |
| 7½＜ OD ≤ 9 | 190.5＜ OD ≤ 228.6 | -0.045 - 0.015 | -1.14 - +0.038 |
Tom qab muab tso rau hauv lub boiler, lub raj yuav tsum muaj peev xwm tiv tau expansion thiab dabtsi yog khoov yam tsis muaj cracking defects los yog tawg ntawm welds.
Lub superheater tubing yuav tsum muaj peev xwm tiv taus txhua qhov tsim nyog forging, vuam, thiab khoov ua haujlwm yam tsis muaj teeb meem.
Feem ntau yog siv hauv boiler raj, boiler flues, superheater flues, thiab kev nyab xeeb kawg.
ASTM A178 Qib Atubing cov ntsiab lus qis carbon muab nws zoo weldability thiab siab toughness rau cov ntawv thov uas tsis raug rau siab siab.
Nws yog feem ntau yog siv rau kev siv hluav taws xob tsawg thiab nruab nrab kub xws li cov boilers uas tsis tshua muaj siab (piv txwv li, cov boilers hauv tsev, cov chaw ua haujlwm me me, los yog lub Hoobkas boilers) thiab lwm yam kub exchangers nyob rau hauv qis-kub ib puag ncig.
ASTM A178 Qib Cmuaj cov pa roj carbon ntau dua thiab manganese cov ntsiab lus muab cov raj no zoo dua lub zog thiab kub ua haujlwm rau kev xav tau kev ua haujlwm ntau dua.
Haum rau nruab nrab siab thiab nruab nrab kub daim ntaub ntawv xws li kev lag luam thiab dej kub boilers, uas feem ntau yuav tsum tau siab dua thiab kub dua li domestic boilers.
ASTM A178 Qib Dcov hlab ntsha muaj cov ntsiab lus siab manganese thiab cov ntsiab lus silicon tsim nyog los muab lub zog zoo thiab ua haujlwm kub, ua rau lawv ruaj khov nyob rau hauv qhov kub thiab txias ib puag ncig thiab tsim nyog rau kev ua haujlwm hnyav.
Feem ntau siv nyob rau hauv high-pressure thiab high-temperature ib puag ncig, xws li lub hwj chim chaw nres tsheb boilers thiab industrial superheaters.
1. ASTM A179 / ASME SA179 Cov Lus Qhia: Seamless me me steel tshav kub exchanger thiab condenser raj rau kev pab cuam cryogenic.Feem ntau siv nyob rau hauv qhov chaw qis qis, nws zoo ib yam hauv tshuaj thiab cov khoom siv kho tshuab rau ASTM A178.
2. ASTM A192 / ASME SA192: Seamless carbon steel boiler raj hauv kev pabcuam siab.Feem ntau siv rau hauv kev tsim cov phab ntsa dej, cov khoom siv nyiaj txiag thiab lwm yam khoom siv siab rau ultra-siab siab boilers.
3. ASTM A210 / ASME SA210 / ASTM A210 / ASTM A210 / ASME SA210 / ASTM A210 / ASME SA210 / ASTM A210 / ASME SA210 / ASTM A210 / ASME SA210 / ASTM A210 / ASTM A210 / ASME SA210 / ASTM A210 / ASME SA210 / ASTM A210 / ASME SA210 / ASTM A210 / ASME SA210 / ASTM A210 / ASME SA210 / ASTM A210 / ASTM A210 / ASME SA210 / ASME SA210 / ASTM A210 / ASME SA210 / ASTM A210 / ASME SA210 / ASTM A210 / ASME SA210): Npog seamless nruab nrab carbon thiab alloy steel boiler thiab superheater raj rau kub thiab nruab nrab siab boiler systems.
4. TIAB SA 17175: Seamless steel raj thiab kav dej siv rau hauv kev kub siab thiab kub ib puag ncig.Feem ntau yog siv rau hauv kev tsim cov kav dej rau boilers thiab cov hlab ntsha siab.
5. TS EN 10216-2: Qhia cov txheej txheem rau cov raj seamless thiab cov kav dej ntawm cov hlau tsis muaj hlau thiab cov hlau tsis muaj hlau nrog cov khoom siv kub kub rau cov ntawv thov hauv siab.
6. JIS G3461: Npog carbon steel raj rau boilers thiab tshav kub exchangers.Nws yog qhov tsim nyog rau qhov dav dav qis thiab nruab nrab siab kub pauv cov xwm txheej.
Peb yog ib tug zoo welded carbon steel yeeb nkab chaw tsim tshuaj paus thiab tsum los ntawm Tuam Tshoj, thiab kuj yog ib tug seamless steel yeeb nkab stockist, muab koj ib tug ntau yam ntawm cov yeeb nkab steel kev daws teeb meem!
Yog xav paub ntxiv los yog xav paub ntxiv txog peb cov khoom, tsis txhob yig tiv tauj peb.Koj cov yeeb nkab steel zoo tshaj plaws tsuas yog cov lus tawm!
