ASTM A270 Sanitary Pipe Standard Specification.pdf
Tso lus
ASTM A270 khoom yog dab tsi?
ASTM A270 yog ib qho kev qhia tshwj xeeb rau kev huv huv (siab huv si) cov kav dej ua los ntawm austenitic thiab ferritic stainless hlau, haum rau kev lag luam uas xav tau kev nyiam huv heev, xws li zaub mov, dej haus, thiab biopharmaceutical ua. Cov qib siv feem ntau suav nrog 304 thiab 316 stainless hlau. Cov qauv no yuav tsum tau cov kav dej kom muaj qhov ua tiav ntawm qhov chaw siab heev, qhia txog qhov ntev ntawm qhov ntev, thiab tswj xyuas cov cuab yeej cuab tam thiab tsis yog -kev sim ua kom puas tsuaj kom ntseeg tau tias lawv tsim nyog rau kev siv huv huv.
Dab tsi yog A270 khoom specification?
Qhov kev qhia tshwj xeeb no suav nrog seamless, welded, thiab txias hnyav - ua haujlwm welded austenitic thiab ferritic / austenitic stainless hlau huv tubing siv rau hauv cov khoom noj siv mis thiab zaub mov. Cov tubings no muaj kev kho tshwj xeeb saum npoo thiab npog tubing nrog qhov siab tshaj plaws sab nraud ntawm 12 ntiv tes (300 mm).
Cov tshuaj muaj pes tsawg leeg ntawm ASTM A270 yog dab tsi?
ASTM A270 qhia txog cov tshuaj muaj pes tsawg leeg ntawm ntau qib ntawm austenitic stainless hlau, feem ntau 304L thiab 316L. Piv txwv li, 304L muaj cov ntsiab lus siab tshaj plaws ntawm 0.035% thiab cov ntsiab lus nickel ntawm 8% thiab 13%; thaum 316L muaj 2% mus rau 3% molybdenum ntxiv los txhim kho nws cov corrosion kuj.
| Qib | UNS Tsim |
Kev sib xyaw,% | ||||||||||
| C | Mn | P | S | Si | Cr | Ni | Mb | Ti | Nb | N | ||
| TIAB SA 304 | S30400 | 0.08 | 2 | 0.045 | 0.03 | 1 | 18.0–20 | 8.0–11 | . . . | . . . | . . . | . . . |
| TP 304 L | S30403 | 0.035 | 2 | 0.045 | 0.03 | 1 | 18.0–20 | 8.0–13 | . . . | . . . | . . . | . . . |
| TIAB SA 316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0–18 | 10.0–14 | 2.00–3 | . . . | . . . | . . . |
| TP 316 L | S31603 | 0.035 | 2 | 0.045 | 0.03 | 1 | 16.0–18 | 10.0–14 | 2.00–3 | . . . | . . . | . . . |
| TIAB SA 321 | S32100 | 0.08 | 2 | 0.045 | 0.03 | 1 | 17.0–19 | 9.0–12 | . . . | Ti 5 × (C+N) min, 0.70 max | . . . | 0.1 |
A270 / A270M tubing Txheem Mechanical Properties
ASTM A270 (tseem hu ua A270/A270M-15/19) qhia txog qhov muaj zog tensile yam tsawg kawg nkaus, qhov tsawg kawg nkaus yield zog, yam tsawg kawg nkaus elongation, thiab siab tshaj Rockwell hardness.
| Qib (UNS) | Tensile zog, min (ksi [MPa]) | Yield zog, min (0.2% offset) (ksi [MPa]) | Elongation hauv 2 nti, min (%) | Rockwell Hardness, max |
|---|---|---|---|---|
| TP 304 (S30400) | 75 [515] | 30 [205] | 35 | B90 |
| TP304L (S30403) | 70 [485] | 25 [170] | 35 | B90 |
| TP 316 (S31600) | 75 [515] | 30 [205] | 35 | B90 |
| TP316L (S31603) | 70 [485] | 25 [170] | 35 | B90 |
| S31803 | 90 [620] | 65 [450] | 25 | C30.5 |
| 2205 (S32205) | 95 [655] | 70 [485] | 25 | C30.5 |
| 2507 (S32750) | 116 [800] | 80 [550] | 15 | C32 |
Dab tsi yog qhov kam rau ua ntawm ASTM A270?
ASTM A270 tau teev tseg tiasphab ntsa thickness ntawm txhua qhov chaw tsis tuaj yeem tshaj 12.5%ntawm qhov xav tau phab ntsa thickness.
| OD Loj | Nominal phab ntsa | Sab nraum Dia | Ntev | Phab ntsa |
| 1/2″ (12.7) | 0.065″ (1.65) | +/-0.005 (0.13) | +1/8″ (3.18)/-0 | +/-10% |
| 3/4″ (19.1) | 0.065″ (1.65) | +/-0.005 (0.13) | +1/8″ (3.18)/-0 | +/-10% |
| 1″ (25.4) | 0.065″ (1.65) | +/-0.005 (0.13) | +1/8″ (3.18)/-0 | +/-10% |
| 1-1/2″ (38.1) | 0.065″ (1.65) | +/-0.008 (0.20) | +1/8″ (3.18)/-0 | +/-10% |
| 2″ (50.8) | 0.065″ (1.65) | +/-0.008 (0.20) | +1/8″ (3.18)/-0 | +/-10% |
| 2-1/2″ (63.5) | 0.065″ (1.65) | +/-0.010 (0.25) | +1/8″ (3.18)/-0 | +/-10% |
| 3″ (76.2) | 0.065″ (1.65) | +/-0.010 (0.25) | +1/8″ (3.18)/-0 | +/-10% |
| 4″ (101.6) | 0.083″ (2.11) | +/-0.015 (0.38) | +1/8″ (3.18)/-0 | +/-10% |
| 6″ (152.4) | 0.109″ (2.77) | +/-0.030 (0.76) | +3/16″ (4.76)/-0 | +/-10% |
| 8″ (203.2) | 0.109″ (2.77) | +/-0.030 (0.76) | +3/16″ (4.76)/-0 | +/-10% |
ASTM A270 Kev ntsuas siab
ASTM A270 tsis muaj ib qho "siab ntsuas"; Hloov chaw, qhov ntsuas siab yog txiav txim siab los ntawm lub raj qhov tshwj xeeb qhov ntev, xws li sab nraud (OD) thiab phab ntsa tuab, nrog rau cov khoom siv qib (xws li 304, 316L). Piv txwv li, 1 "OD, 0.065" phab ntsa ASTM A270 raj tuaj yeem muaj kev ua haujlwm siab ntawm ib puag ncig 2,440 PSI, thaum lub 1½ "OD raj nrog tib phab ntsa tuab yuav muaj qhov ntsuas qis dua ntawm kwv yees li 1,630 PSI.
ASTM A270 yeeb nkab yog dab tsi?
ASTM A270 sanitary stainless yeeb nkab feem ntau yog hais txog cov yeeb nkab me me, feem ntau ntawm 1/2 "rau 2 1/2", thickness ntawm 0.049 hauv (1.24mm) txog 0.15 hauv (3.81mm). Qhov siab tshaj plaws sab nraud ntawm ASTM A270 tubing yog 12 nti (304.8 mm).
Dab tsi yog qhov txawv ntawm ASTM A269 thiab A270?
Qhov sib txawv tseem ceeb yog tias A270 tubing feem ntau siv rau hauv kev lag luam xws li khoom noj khoom haus thiab tshuaj, thiab suav nrog cov kev cai xws li tshem tawm cov hlua khi sab hauv, sab hauv phab ntsa polishing, thiab kev soj ntsuam nruj dua. ASTM A269 tubing, ntawm qhov tod tes, yog qhov tsim nyog rau ntau daim ntawv thov kev lag luam, xws li cov khoom siv hluav taws xob thiab cov condensers, qhov chaw me me ntawm qhov tsis xws luag yog tso cai.
