SUS316 vs SUS316L: Txheem vs Tsawg- Carbon Molybdenum Austenitic Stainless Hlau
Dec 30, 2025
Tso lus
Tshuaj muaj pes tsawg leeg rau JIS G4303 thiab G4304
Ob qib sib piv cov qauv tsim tshwj xeeb rau cov pa roj carbon, uas yog tag nrho lub hauv paus ntawm qhov sib txawv ntawm lawv.
| Cov ntsiab lus,% | SUS 316 | SUS 316L |
|---|---|---|
| Cov pa roj carbon (C) | 0.08 max | 0.030 max |
| Silicon (Si) | max 1.00 Nws | max 1.00 Nws |
| Manganese (Mn) | max 2.00 Nws | max 2.00 Nws |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.030 max | 0.030 max |
| Chromium (Cr) | 16.00-18.00 | 16.00-18.00 |
| Nickel (Ni) | 10.00-14.00 | 10.00-14.00 |
| Molybdenum (hli) | 2.00-3.00 | 2.00-3.00 |
Cov npe sib npaug: SUS316=UNS S31600, EN 1.4401 (X5CrNiMo17-12-2), AISI 316; SUS316L=UNS S31603, EN 1.4404 (X2CrNiMo17-12-2), AISI 316L.
Mechanical Properties
Yam tsawg kawg nkaus annealed khoom yog qhia hauv qab no; Cov pa roj carbon ntau dua ntawm SUS316 muab nws lub zog me me kom zoo dua.
| Property (ntxiv) | SUS316 (JIS G4304) | SUS316L (JIS G4304) |
|---|---|---|
| Tensile zog, MPa | 520 min | 480 min |
| 0.2% pov thawj kev ntxhov siab, MPa | 205 feeb | 175 feeb |
| Elongation,% | 40 feeb | 40 feeb |
Qhov sib npaug ASTM A240 yam tsawg kawg nkaus yog 515/205 MPa rau S31600 thiab 485/170 MPa rau S31603, nrog 217 HBW siab tshaj plaws hardness rau ob qho tib si. Ob qib khaws cia zoo heev ntawm qhov kub thiab txias ntawm qhov kub thiab txias mus txog -196 degree, yog li qhov kev xaiv ntawm lawv tsis tshua muaj kev txiav txim siab los ntawm tus cwj pwm kub qis.
Weldability thiab Intergranular Corrosion
Thaum cov qib austenitic tsis ruaj khov yog cua sov hauv 425-815℃ntau yam, carbon thiab chromium daim ntawv chromium carbides ntawm cov ciam teb nplej, depleting chromium thiab ua kom muaj kev sib txhuam. Qhov no tshwm sim nyob rau hauv lub tshav kub- cuam tshuam cheeb tsam ntawm welds thiab thaum lub sij hawm kev pab cuam nyob rau hauv uas kub ntau yam. SUS316, nrog 0.08% carbon, muaj kev cuam tshuam rau qhov rhiab heev, thiab rau kev pab cuam corrosive nws cov weldments yuav tsum tau tov annealed, uas yog impractical rau cov hlab ntsha loj thiab teb pob qij txha. SUS316L, nrog 0.03% carbon, muaj cov pa roj carbon me me uas chromium-carbide nag lossis daus tau zoo, yog li nws tiv thaiv intergranular corrosion nyob rau hauv raws li -welded mob thiab tsis xav tau tom qab-weld kub kho nyob rau hauv feem ntau thicknesses. Rau kev siv welded hauv chloride, acidic lossis siab - kev pabcuam purity, SUS316L yog tus qauv xaiv; SUS316 suits tsis-welded qhov chaw xws li forgings, valve lub cev thiab machined Cheebtsam.
Corrosion Resistance thiab Kev Pabcuam Kub
Ob qib nqa tib lub molybdenum, yog li lawv tsis kam rau pitting, crevice corrosion thiab chloride stress corrosion nyob rau hauv seawater, brine thiab tshuaj lom neeg kev pab cuam yog sib npaug thaum cov khoom nyob rau hauv qhov raug tshav kub- kho mob. Qhov sib txawv yog nyob rau hauv lub xeev welded, qhov twg SUS316L khaws nws cov tsis kam thiab SUS316 tsis yog tsis muaj annealing. Kev pabcuam kub tsis tu ncua yog feem ntau hais txog 870℃rau cov khoom me me hauv oxidizing cua rau ob qib, nrog txo lub zog ntawm qhov ntau; tsim tshaj li 550℃yuav tsum siv cov ntaub ntawv nkag. Hauv kev txo qis acids lossis cov tshuaj chloride siab heev, tsis muaj qib txaus thiab siab dua - qib alloy xws li 904L lossis 6% molybdenum super- austenitic yuav tsum raug txiav txim siab.
Daim Ntawv Thov thiab Kev Taw Qhia Kev Xaiv
SUS316 yog qhov zoo dua rau cov uas tsis yog- vuam lossis ncej-weld- cov khoom siv tsis zoo hauv cov kev pabcuam corrosive: forged valve lub cev thiab stems, machined twj tso kua mis qhov chaw, shafting, fasteners, furnace Cheebtsam thiab architectural hardware. SUS316L yog lub neej ntawd rau kev vuam-kev tsim khoom hnyav hauv qhov chaw hnyav: cov tshuaj tiv thaiv cov hlab ntsha, cov tso tsheb hlau luam thiab cov kav dej, cov dej hiav txwv desalination cog, cov khoom siv tshuaj thiab bioprocess, marine engineering Cheebtsam, thiab zaub mov thiab dej haus ua cov nroj tsuag. Txoj cai siv tau: yog tias ib feem yog welded thiab ib puag ncig yog corrosive, siv SUS316L; Yog hais tias ib feem yog machined los yog forged, nqa ntau dua loads, thiab vuam tsis tuaj, SUS316 muaj ib tug me me lub zog thiab tus nqi kom zoo dua.
Cov lus nug nquag
Q1: Dab tsi yog qhov sib txawv ntawm SUS316 thiab SUS316L?A1: Cov ntsiab lus carbon. SUS316 txwv carbon rau 0.08% siab tshaj plaws thiab SUS316L rau 0.030% siab tshaj plaws; tag nrho lwm cov ntsiab lus zoo ib yam.
Q2: Vim li cas SUS316L nyiam rau cov khoom siv welded?A2: Cov ntsiab lus carbon tsawg suppresses chromium-carbide nag lossis daus nyob rau hauv lub vuam kub- cuam tshuam cheeb tsam, yog li cov welded sib koom tiv thaiv intergranular corrosion tsis muaj ncej-weld annealing. SUS316 weldments xav tau kev daws annealing rau kev pabcuam hnyav.
Q3: Puas yog SUS316 muaj zog dua SUS316L?A3: Me ntsis. Ib JIS G4304, SUS316 muaj 520 MPa lub zog tensile yam tsawg kawg nkaus thiab 205 MPa pov thawj kev ntxhov siab rau 480 MPa thiab 175 MPa rau SUS316L. Qhov txawv yog me me thiab tsis tshua muaj tswj kev tsim.
Q4: Puas yog SUS316L xav tau kev tshaj tawm -weld cua sov kho?A4: Tsis yog rau corrosion kuj nyob rau hauv feem ntau thicknesses. Cov ntu tuab heev lossis kev pabcuam hauv qhov kev nkag siab ntau yam tseem tuaj yeem lees paub qhov tseeb los ntawm kev ntsuas kev sib xyaw ua ke ntawm ASTM A262.
Q5: Qib twg kim dua?A5: SUS316L feem ntau yog 5-10% kim dua SUS316 vim tias cov pa roj carbon nruj dua thiab kev xav tau ntau dua. Tus nqi yog me me txheeb ze rau vuam thiab tshuaj xyuas cov nqi nws txuag.
Q6: Puas tuaj yeem SUS316 hloov SUS316L hauv kev pabcuam welded?A6: Tsuas yog cov welding tuaj yeem daws tau tom qab vuam. Hauv cov txheej txheem loj welded qhov twg annealing yog tsis yooj yim sua, lub tshav kub - cuam tshuam cheeb tsam ntawm SUS316 txaus ntshai intergranular corrosion thiab SUS316L yuav tsum tau siv.
Xa kev nug