316L vs . 904L Stainless Hlau Heat Exchanger Tubes
Mar 20, 2026
Tso lus
Thaum lub sij hawm xaiv cov txheej txheem rau stainless hlau tshav kub exchanger raj, kev xaiv ntawm cov khoom ncaj qha cuam tshuam rau lub neej kev pab cuam, corrosion kuj, thiab tag nrho cov nqi system. Ntawm cov khoom siv ntau yam austenitic stainless hlau, ob qho tib si 316L thiab 904L pom zoo corrosion kuj. Txawm li cas los xij, qhov twg ntawm ob cov ntaub ntawv no yog qhov zoo tshaj plaws rau koj qhov kev thov tshwj xeeb?
Tsab ntawv xov xwm no muab cov ncauj lus kom ntxaws sib piv ntawm 316L thiab 904L stainless hlau cua kub exchanger raj, aiming pab engineers, purchasing managers, thiab kawg -cov neeg siv hauv kev txiav txim siab.
316L vs . 904L Stainless Hlau Heat Exchanger Tubes
Dab tsi yog 316L stainless hlau tshav kub exchanger raj?
316L stainless hlau tshav kub exchanger tube yog nyias-walled tubular tivthaiv fabricated los ntawm qis-carbon austenitic stainless hlau (UNS S31603). Tshwj xeeb tsim los rau cov tshuab kev lag luam-xws li condensers, boilers, thiab plhaub-thiab- raj kub exchangers- nws muaj 16-18% chromium, 10-14% npib tsib xee, thiab 2-3% molybdenum, yog li txhim kho nws cov chloride thiab tshuaj corrosion. Nws tsim lub hom phiaj los pab txhawb kev hloov pauv kom muaj txiaj ntsig zoo thaum ua kom lub sijhawm ntev - corrosion kuj.
Dab tsi yog 904L stainless hlau tshav kub exchanger raj?
904L stainless hlau tshav kub exchanger tubes yog siab -alloy austenitic stainless hlau raj (UNS N08904 / 1.4539) uas muaj cov pa roj carbon tsawg, siab nickel, thiab molybdenum, tailored rau huab corrosion kuj, tshwj xeeb tshaj yog nyob rau hauv sulfuric, phosphoric, thiab acetic acid ib puag ncig. Lawv muaj qhov zoo tshaj pitting thiab crevice kuj nyob rau hauv chloride - hnyav, siab - kub, los yog seawater daim ntaub ntawv.
316L vs . 904L Stainless hlau:Kev sib piv tshuaj lom neeg (% Max)
| Qib | UNS | Cov pa roj carbon (C) | Chromium (Cr) | Nickel (Ni) | Molybdenum (hli) | Copper (Cu) |
| AISI 316L | S31603 | 0.03 | 16.0 – 18.0 | 10.0 – 14.0 | 2.0 – 3.0 | - |
| AISI 904L | N08904 | 0.02 | 19.0 – 23.0 | 23.0 – 28.0 | 4.0 – 5.0 | 1.0 – 2.0 |
316L vs . 904L Stainless hlau:Mechanical Properties (ntawm chav tsev kub)
Thaum 904L muaj kev tiv thaiv corrosion zoo heev, nws lub zog txhua yam yog qis dua los yog piv rau 316L.
| Khoom | AISI 316L | AISI 904L |
| Tensile zog (min) | 485 MPa (70 ksi) | 490 MPa (71 ksi) |
| Yield zog (0.2% offset) | 170 MPa (25 ksi) | 220 MPa (32 ksi) |
| Elongation (% hauv 50mm) | 35% | 35% |
| Hardness (Max) | 192 HWB / 90 HRB | 192 HWB / 90 HRB |
316L vs . 904L Stainless hlau:Lub cev muaj zog
| Khoom | AISI 316L | AISI 904L |
| Qhov ceev (g / cm³) | 7.98 | 8.05 |
| Thermal conductivity (W / m · K) | 16.3 (ntawm 100 degree) | 12.9 (ntawm 100 degree) |
| Thaum tshav kub kub tshwj xeeb (J / kg·K) | 500 | 450 |
| Thermal Expansion | 16.5 (0-100 degree) | 15.0 (0-100 degree) |
| Elastic Modulus (GPa) | 193 | 190 |
316L Vs . 904L Stainless Hlau: Corrosion Resistance
| Performance Metric | AISI 316L | AISI 904L |
| PREN Tus nqi | 23.0 – 28.5 | 32.2 – 39.5 |
| Pitting Resistance | Nruab nrab | Superior |
| SCC Resistance | Low (Susceptible >60 degree) | Siab (Nickel{0}} nplua nuj matrix) |
| chloride txwv (ppm) | < 1,000 ppm | Txog li 30,000 ppm |
| Critical Pitting Temp (CPT) | ~ 15 degree | ~ 40 degree |
Thaum twg los xaiv 904L Tshaj 316L Kub Exchanger Tubes?
Kev Pabcuam Sulfuric Acid:904L tau tsim tshwj xeeb los tiv thaiv sulfuric acid ib puag ncig; Nws tswj tau zoo heev corrosion kuj nyob rau hauv ib tug kub ntawm txog 40 degree, tsis hais cov kua qaub concentration.
Kub Seawater Thaum tshav kub kub Exchangers:Thaum cov dej hiav txwv kub siab tshaj 25 degree, 316L stainless hlau yuav ua rau muaj kev cuam tshuam sai rau pitting corrosion. Hauv qhov sib piv, 904L muab qhov kev nyab xeeb txaus rau cov chaw tsim hluav taws xob hauv ntug dej hiav txwv thiab cov ntug dej hiav txwv drilling.
High-Chloride "High-Tsub Cheeb Tsam":Yog tias koj lub tshuab hluav taws xob ua haujlwm nyob rau hauv ib puag ncig siab tshaj 60℃thiab raug rau cov kua dej uas muaj cov tshuaj chloride siab, 316L stainless hlau muaj feem yuav raug kev txom nyem los ntawm Stress Corrosion Cracking (SCC) li ntawm 1 mus rau 2 xyoos; 904L zoo inhibits qhov tsim ntawm cov kab nrib pleb.
904L Tubing Procurement Checklist
Ntawm GNEE, peb xav kom koj hais kom ua raws li cov cai hauv qab no thaum tso qhov kev txiav txim rau ib pawg ntawm 904L tubing:
100% PMI Kev Ntsuas: Xyuas kom meej tias cov ntsiab lus Nickel (Ni) tiag tiag ntau dua 23% thiab cov ntsiab lus Molybdenum (Mo) ntau dua 4%.
Kev kho Annealing kev kho: Cov khoom siv 904L yuav tsum tau ua raws li tus txheej txheem annealing los xyuas kom meej tias cov khoom tooj liab yog tag nrho yaj rau hauv cov hlau matrix, yog li ua tiav cov kua qaub zoo.
Precise Phab Ntsa Thickness Control: Qhia kom meej phab ntsa thickness kam rau ua ntau yam ntawm ± 0.05mm los xyuas kom meej qhov sib xws hauv kev ua haujlwm kub.
Traceability: Muab daim ntawv pov thawj tiav Cov Khoom Siv Xeem (MTC) ua raws li EN 10204 3.1 tus qauv, qhia meej txog tus nqi PREN.
Ntawm GNEE, peb tshwj xeeb hauv siab - tubing kev ua tau zoo rau cov txheej txheem thermal tseem ceeb. Txawm hais tias koj xav tau tus nqi -kev ua tau zoo ntawm ASTM A213 316L lossis qhov tsis zoo ntawm ASTM A213 904L, peb muab:
Advanced NDT: Eddy Tam sim no thiab Hydro{0}} kuaj ntawm 100% ntawm cov raj.
Kev Thauj Khoom Thoob Ntiaj Teb: Kev ntim khoom ruaj ntseg hauv cov dej noo- pov thawj, cov rooj ntoo ntxiv rau kev puas tsuaj- pub dawb.
Kev Pabcuam Kev Pabcuam: Pab koj cov engineers xam qhov PREN txoj cai rau koj cov kua dej tshwj xeeb.
Xa kev nug