Qib 321 thiab 347 yog qhov yooj yim austenitic 18/8 steel (Qib 304) stabilized los ntawm Titanium (321) lossis Niobium (347) ntxiv.Cov qib no yog siv vim lawv tsis nkag siab rau intergranular corrosion tom qab cua sov hauv carbide nag lossis daus ntawm 425-850 ° C.Qib 321 yog qib kev xaiv rau cov ntawv thov nyob rau hauv qhov kub thiab txias txog li 900 ° C, sib txuas lub zog siab, tsis kam mus rau scaling thiab theem stability nrog kev tiv thaiv tom qab aqueous corrosion.
Qib 321H yog kev hloov kho ntawm 321 nrog cov ntsiab lus ntawm cov pa roj carbon ntau dua, txhawm rau txhim kho qhov kub thiab txias zog.
Ib qho kev txwv nrog 321 yog tias titanium tsis hloov mus zoo hla qhov kub-kub arc, yog li nws tsis pom zoo ua cov khoom siv vuam.Hauv qhov no, qib 347 yog qhov zoo dua - niobium ua haujlwm zoo ib yam carbide stabilization tab sis tuaj yeem hloov mus hla lub vuam arc.Qib 347 yog, yog li ntawd, tus qauv siv tau rau vuam 321. Qib 347 tsuas yog qee zaus siv los ua niam txiv cov khoom siv.
Zoo li lwm cov qib austenitic, 321 thiab 347 muaj cov qauv zoo heev thiab vuam cov yam ntxwv, tau yooj yim nres lossis yob tsim thiab muaj cov yam ntxwv zoo heev.Tom qab vuam annealing tsis tas yuav tsum tau.Lawv kuj muaj zoo heev toughness, txawm mus rau cryogenic kub.Qib 321 tsis polish zoo, yog li tsis pom zoo rau kev siv kho kom zoo nkauj.
Qib 304L yog yooj yim dua nyob rau hauv feem ntau cov ntaub ntawv cov khoom, thiab yog li feem ntau yog siv nyob rau hauv kev nyiam rau 321 yog hais tias qhov yuav tsum tau tsuas yog rau kev tiv thaiv intergranular corrosion tom qab vuam.Txawm li cas los xij, 304L muaj lub zog kub qis dua 321 thiab yog li tsis yog qhov kev xaiv zoo tshaj plaws yog tias qhov yuav tsum tau muaj kev tiv thaiv rau qhov chaw ua haujlwm tshaj li 500 ° C.
Cov khoom tseem ceeb
Cov khoom no tau teev tseg rau cov khoom lag luam tiaj tus (phaj, ntawv, thiab coil) hauv ASTM A240 / A240M.Zoo sib xws tab sis tsis tas yuav zoo ib yam khoom yog teev rau lwm yam khoom xws li yeeb nkab thiab bar hauv lawv cov specifications.
Kev sib xyaw
Cov khoom sib xyaw ua ke rau qib 321 stainless hlau yog muab rau hauv rooj 1.
Table 1.Kev sib xyaw ua ke rau 321-qib stainless hlau
| Qib | C | Mn | Si | P | S | Cr | Mo | Ni | N | Lwm yam | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 321 | min. max | - 0.08 ib | 2.00 Nws | 0.75 ib | 0.045 ib | 0.030 Nws | 17.0 Nws 19.0 Nws | - | 9.0 ib 12.0 Nws | 0.10 | Ti = 5 (C + N) 0.70 ib |
| 321 h ua | min. max | 0.04 ib 0.10 | 2.00 Nws | 0.75 ib | 0.045 ib | 0.030 Nws | 17.0 Nws 19.0 Nws | - | 9.0 ib 12.0 Nws | - | Ti = 4(C+N) 0.70 ib |
| 347 ib | min. max | 0.08 ib | 2.00 Nws | 0.75 ib | 0.045 ib | 0.030 Nws | 17.0 Nws 19.0 Nws | - | 9.0 ib 13.0 Nws | - | Nb=10(C+N) 1.0 |
Mechanical Properties
Tej yam khoom siv rau qib 321 stainless hlau yog muab rau hauv rooj 2.
Rooj 2.Mechanical zog ntawm 321-qib stainless hlau
| Qib | Tensile zog (MPa) min | Yield Strength 0.2% Pov thawj (MPa) min | Elongation (% hauv 50 mm) min | Hardness | |
|---|---|---|---|---|---|
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 321 | 515 | 205 | 40 | 95 | 217 |
| 321 h ua | 515 | 205 | 40 | 95 | 217 |
| 347 ib | 515 | 205 | 40 | 92 | 201 |
Lub cev muaj zog
Cov khoom siv lub cev zoo rau qib annealed qib 321 stainless hlau yog muab rau hauv rooj 3.
Table 3.Lub cev muaj zog ntawm 321-qib stainless hlau nyob rau hauv cov mob annealed
| Qib | Qhov ceev (kg / m3) | Elastic Modulus (GPa) | Qhov nruab nrab Coefficient ntawm Thermal Expansion (μm / m / ° C) | Thermal conductivity (W / mK) | Kev kub ceev 0-100 ° C (J / kg.K) | Hluav taws xob tsis kam (nΩ.m) | |||
|---|---|---|---|---|---|---|---|---|---|
| 0-100 ° C | 0-315 ° C | 0-538 ° C | ntawm 100 ° C | ntawm 500 ° C | |||||
| 321 | ib 8027 | 193 | 16.6 | 17.2 ib | 18.6 ib | 16.1 | 22.2 | 500 | 7 20 |
Qib Specification piv
Kwv yees qib sib piv rau 321 stainless hlau ntawv yog muab rau hauv rooj 4.
Rooj 4.Qib specifications rau 321-qib stainless hlau
| Qib | UNS No | Laus British | Euronorm | Swedish SS | Japanese JIS | ||
|---|---|---|---|---|---|---|---|
| BS | En | No | Lub npe | ||||
| 321 | S32100 | 321s31 ib | 58b,58 ib | 1.4541 ib | X6CrNiTi18-10 | 2337 ib | TIAB SA 321 |
| 321 h ua | S32109 | 321s51 ib | - | 1.4878 ib | X10CrNiTi18-10 | - | SUS 321 H |
| 347 ib | S34700 Nws | 347s31 ib | 58g ua | 1.4550 Nws | X6CrNiNb18-10 | ib 2338 | TIAB SA 347 |
Post lub sij hawm: Jun-06-2023