GNEE yog lub chaw tsim khoom ntseeg tau tuav ntau yam ntawv pov thawj muaj koob npe, suav nrog ISO 9001, PED, TÜV thiab ASME. Peb tau ua tiav ntau tshaj 200 txoj haujlwm hauv ntau tshaj 30 lub teb chaws thoob ntiaj teb, thiab txhua pawg ntawm cov khoom tau muab nrog Daim Ntawv Qhia Txog Cov Khoom Siv (MTR). Peb cov khoom yog qhov kev xaiv zoo tshaj plaws rau cov cua kub cua kub hauv cov chaw tsim hluav taws xob nuclear thiab rau cov phiaj xwm hluav taws xob sib txawv hauv kev lag luam petrochemical thiab tshuaj lom neeg.
ASTM A268 TP439 stainless hlau raj yog tsim los siv seamless (kos) los yog welded txheej txheem, tsis tas yuav ntxiv cov muab tub lim hlau thaum vuam. Txhua lub raj hlau yuav tsum tau rov ua kom sov rau qhov kub ntawm 1200 degrees F [650 degrees] lossis siab dua, ua raws li cov txheej txheem txias. Qhov chaw ntawm tag nrho cov raj yuav tsum tsis pub dhau lub zeb nplai thiab yuav tsum nyob rau hauv ib qho chaw tsim nyog rau kev soj ntsuam. Cov yeeb yaj kiab me me ntawm oxide yuav tsis suav tias yog zeb nplai.
Rau ASTM A268 TP439 welded yeeb nkab, cov txheej txheem siab heev xws li TIG vuam thiab Kev Kho Mob Tom Qab Kub Kub (PWHT) yog siv los txo cov kev ntxhov siab seem thiab txo qhov kev pheej hmoo ntawm kev ntxhov siab corrosion cracking (SCC). Peb cov raj seamless kuj muaj qhov roughness ntawm Ra <0.6 μm, kom ntseeg tau tias cov kua dej tsawg tsawg thiab kev ua haujlwm zoo heev.
Tsis tas li ntawd, peb TP439 cua kub exchanger raj muaj qhov tshwj xeeb tsis kam rau kev ntxhov siab corrosion cracking (SCC), nrog rau kev pab cuam lub neej nyob rau hauv chloride ib puag ncig uas deb tshaj li ntawm 304 stainless hlau. Nrog thermal conductivity txog li 26 W / (m·K) thiab linear expansion coefficient ntawm 10.8 × 10⁻⁶ / degree, tshav kub hloov efficiency yog txhim kho los ntawm 15% piv rau cov pa ferritic stainless hlau. Ib yam li ntawd, cov hlab ntsha muaj qhov elongation ntawm ntau dua lossis sib npaug li 25%, uas ua rau lawv zoo heev ductility los txhawb U-shaped khoov thiab txoj haujlwm ua haujlwm.
ASTM A268 Stainless hlau yeeb nkab Specification
| Txoj cai | ASTM A268, ASME SA268 |
|---|---|
| Hom yeeb nkab | Welded thiab Seamless |
| Qib | ASTM A268 TP 410, ASTM A268 TP 430, ASTM A268 TP 439 |
| Sab nraud txoj kab uas hla | 1/4 "(6.25mm) txog 8" (203mm) |
| phab ntsa thickness | 0.02 "(0.5mm) rau 0.5" (12mm) |
| Daim ntawv thov | Thaum tshav kub kub exchangers, cua sov, condensers |
Tshuaj muaj pes tsawg leeg ntawm ASTM A268 TP439 Stainless Hlau Round Pipe
| Qib | TIAB SA 439 |
|---|---|
| UNS | S43035 |
| C, max. | 0.07 ib |
| Mn, mas | 1.00 Nws |
| P, max | 0.040 ib |
| S, max. | 0.030 Nws |
| Yog, max. | 1.00 Nws |
| Tsis yog, max. | 0.50 ib |
| Cr | 17.00 – 19.00 dr hab |
| mo | … |
| Rau qhov | 0.15 |
| Cu | … |
| N | 0.04 ib |
| Koj | Min. 0,20 + 4(C+N), max. 1,10 |
ASTM A268 Yeeb Nkab Dimension Tolerances
| Sab nraud txoj kab uas hla, hauv [mm] | OD kam rau ua, hauv [mm] | Phab ntsa thickness,% | nyias phab ntsa kav |
|---|---|---|---|
| Txog 1⁄2 [12.7], excl. | ± 0.005 [0.13] | ± 15 | - |
| 1⁄2 txog 11⁄2 [12.7–38.1], excl. | ± 0.005 [0.13] | ± 10 | Tsawg dua 0.065 nti [1.6mm] nominal |
| 11⁄2 txog 31⁄2 [38.1–88.9], excl. | ± 0.010 [0.25] | ± 10 | Tsawg dua 0.095 in. [2.4mm] nominal |
| 31⁄2 txog 51⁄2 [88.9–139.7], excl. | ± 0.015 [0.38] | ± 10 | Tsawg dua 0.150 nti [3.8mm] nominal |
| 51⁄2 rau 8 [139.7 rau 203.2], incl. | ± 0.030 [0.76] | ± 10 | Tsawg dua 0.150 nti [3.8mm] nominal |
ASTM A268 yog dab tsi?
ASTM A268 yog "Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Pipe, General Service." Cov qib uas tau txais los ntawm tus qauv no suav nrog TP410, TP405, TP420, TP430, TP430Ti, TP403, TP409, TP444, TP439 thiab TP446, uas yog tsim rau siv nyob rau hauv dav corrosion kuj thiab kub ib puag ncig; ASME SA268 yog qhov sib npaug sib npaug.
Yield zog ntawm TP439 Stainless hlau yeeb nkab
Cov hlau yuav tsum ua tau raws li cov khoom tensile nram qab no: tensile lub zog, elastic txwv thiab elongation.
| Qib | Tensile zog, min., Ksi [MPa] | Yield zog, min., Ksi [MPa] | Elongation, min.,% |
|---|---|---|---|
| TIAB SA 410 | 55 [380] | 30 [205] | 20 |
| TIAB SA 430 | 60 [415] | 35 [240] | 20 |
| TIAB SA 439 | 60 [415] | 30 [205] | 20 |
Cov hlab ntsha yuav tsum muaj tus nqi hardness uas tsis tshaj li Brinell thiab Rockwell hardness qhov tseem ceeb; rau qib TP410, TP430 thiab TP439, qhov siab tshaj plaws ntawm Rockwell hardness yuav yog 90. Daim ntawv tshaj tawm kev xeem ntawv lees paub ua raws li Specification A1016/A1016M yuav tsum tau.
Dab tsi yog qhov txawv ntawm TP439 thiab TP304 stainless hlau raj?
Qhov sib txawv tseem ceeb yog TP304 yog austenitic stainless hlau nrog cov ntsiab lus npib tsib xee (18/8), uas muaj kev tiv thaiv zoo dua thiab sib npaug, nrog rau kev ua kom zoo dua qub; Rau nws feem, TP439 yog ferritic stainless hlau stabilized nrog titanium (18% Cr), tsim los muaj kev tiv thaiv corrosion thiab zoo zog ntawm qhov kub thiab txias, nquag siv hauv tsheb tso tsheb vim nws cov nqi qis.
Ntau yam kev sim tshuab yuav tsum tau ua, xws li:
Tensile xeem;
Flaring xeem (rau seamless kav);
Flange formation test (rau welded kav);
Kev sim hardness;
Rov qab applanation test;
Intergranular corrosion test; thiab
Hydrostatic test los yog tsis muaj kev puas tsuaj hluav taws xob.
Packing thiab marking:
Cov khoom siv yuav tsum tau ntim rau hauv cov pob khoom lossis cov thawv plywood, qhwv hauv cov yas thiab muab cov kev tiv thaiv tsim nyog los xyuas kom muaj kev nyab xeeb ntawm kev xa khoom los ntawm hiav txwv, lossis ntim raws li lwm yam teev tseg.
Kev kos npe yuav tsum ua raws li cov cai ntawm Specification A1016/A1016M. Lub cim yuav tsum qhia seb cov yeeb nkab puas kub lossis txias tiav, thiab yuav suav nrog -tab sis tsis txwv rau - cov ntaub ntawv hauv qab no: tus qauv, qib, qhov ntev, tus lej casting thiab batch tooj.
