Siab -Carbon Stainless hlau 321H

Stainless hlau 321H yog siab -carbon (0.04–0.10%) variant ntawm 321, tsim los txhawb siab - kub lub zog thiab nkag siab tsis kam. Ntau titanium carbides (los ntawm cov pa roj carbon ntau dua) txhawb nws cov qauv, ua rau nws zoo tagnrho rau 800-900℃load-cov kabmob xws li boiler superheaters.

Tshuaj muaj pes tsawg leeg (Key, % ASTM A240)C0.04–0.10; Cr17.0–19.0; 9.0–12.0; Ti5 × C–0.70 (min 0.10); Mn Tsawg dua lossis sib npaug rau 2.0

Mechanical Properties (Annealed): Tensile Strength Ntau dua lossis sib npaug li 550MPa; Yield zog ntau dua los yog sib npaug rau 220MPa; Elongation Ntau dua lossis sib npaug li 35%; Hardness Tsawg dua los yog sib npaug rau 235HB

Kev Ua Haujlwm ZooKub: 900℃kev pab cuam temp; 50% tsawg dua creep dua 321 ntawm 850 degree; titanium stabilization; zoo thermal stress kuj.

Daim ntawv thov: Boiler superheaters, turbine qhov chaw, hnyav- lub luag haujlwm rau cov khoom siv hluav taws xob.

Qib sib npaugTom ntej: EN1.4542, JIS SUS321H, DIN X10CrNiTi18-10

Sib piv nrog 321: 321H muaj zog tensile ntau dua (550 vs . 515MPa); 321 yog pheej yig dua rau Tsawg dua los yog sib npaug rau 800 degree, 321H rau 800-900℃kev ntxhov siab.

FAQs

Vim li cas cov pa roj carbon ntau dua txhim kho 321H siab -kev ua haujlwm kub? 0.04–0.10% carbon reacts nrog titanium los tsim ntau titanium carbides dua 321. Cov carbides nyuaj pin lis ciam teb, slowing atomic zog (ua rau softening / creep) ntawm high temps. Ntawm 850 degree, 321H lub zog tawm los yog 15-20% siab dua 321. Cov nplej nplua nuj los ntawm cov carbides ntxiv txo cov qoob loo ciam teb zawv zawg, ua rau muaj kev nkag siab loj, txhim kho cov qauv kev ruaj ntseg.

 

Puas yog 321H khaws cov tshuaj tiv thaiv corrosion nrog cov pa roj carbon ntau dua? Yog-titanium cov ntsiab lus ntsuas nrog carbon (5 × C min0.10%). Rau 0.10% C, Ti Ntau dua lossis sib npaug li 0.50% khi tag nrho cov pa roj carbon, tiv thaiv chromium carbides. Tsis muaj Cr-depleted aav daim ntawv, yog li intergranular corrosion kuj ntais ntawv 321. Tsuas yog nyob rau hauv huab acids nws lag me ntsis, negligible rau nws siab -kub npaj siv.

 

321H qhov ntsuas kub li cas piv rau lwm qib? Nws 900℃max kev pabcuam zaum ntawm 321 (870 degree) thiab 309S (980 degree). Boiler superheaters (800–850 degree) siv 321H-321 creeps ntau heev, 309S yog overpriced. 347H (980 degree) yog pricier; 310S (1150 degree) yog rau ultra-siab kub. 321H yog tus nqi-zoo rau 800-900℃load-bearing qhov chaw.

Dab tsi fabrication sib txawv ntawm 321H thiab 321? Siv 321H muab tub lim (321 muab tub lim tsis muaj zog welds); me ntsis siab dua vuam tam sim no kom fusion (tsawg tshav kub tseem ceeb heev). dabtsi yog khoov xav tau ntau zog (220 vs . 205MPa yield zog) -pre-anneal rau complex khoov. Tshuab 10–15% qeeb (235 vs. 217HB hardness); siv cov cuab yeej carbide. Anneal post-fabrication (tib yam li 321) los daws kev ntxhov siab.

 

Thaum twg los xaiv 321H tshaj 347H? 347H (niobium-stabilized) tuav 980℃tab sis tus nqi ntau dua . 321H pheej yig dua rau 800-900℃(boiler qhov chaw). 321H welds yooj yim dua (347H txaus ntshai tawg nrog cov tsis zoo). Nyob rau hauv sulfur- ib puag ncig nplua nuj, 321H zoo dua (niobium forms brittle sulfides). Xaiv 321H rau qis-weld, 800-900℃apps; 347H rau ultra{19}}siab kub / hnyav vuam.