Dab tsi yog qhov txawv ntawm 17-4PH thiab Lwm Cov Nroj Tsuag-Hardening (PH) Steels?

Dab tsi yog qhov txawv ntawm 17-4PH thiab Lwm Cov Nroj Tsuag-Hardening (PH) Steels?

Taw qhia

Precipitation-hardening stainless steels (PH steels) yog ib chav kawm ntawm corrosion-resistant alloys uas muab lub zog ntawm martensitic thiab austenitic steels nrog zoo heev corrosion kuj. Ntawm lawv,17-4PH stainless hlauyog arguably qhov feem ntau lug siv vim nws exceptional mechanical zog thiab yooj yim ntawm fabrication. Tab sis nws zoo li cas piv rau lwm qib PH xws li 15-5PH, 13-8Mo, 17-7PH, thiab Custom 465? Cov kab lus no nkag mus tob rau hauv qhov sib txawv ntawm qhov sib txawv, kev kho cua sov, cov khoom siv kho tshuab, kev tiv thaiv corrosion, thiab kev siv.

Txheej txheem cej luam ntawm Precipitation-Hardening Stainless Steels

Precipitation-hardening steels tau txais lawv lub zog los ntawm kev tsim cov precipitates zoo nyob rau hauv cov hlau matrix thaum laus kev kho cua sov. Cov hlau no tau muab faib ua peb pawg loj:

1. Martensitic PH hlau(eg,17-4 PAB15-5PH)
2. Semi-austenitic PH hlau(eg, 17-7PH)
3. Austenitic PH hlau(eg, A286)

Txhua pawg muaj ib qho kev sib xyaw ua ke ntawm cov khoom tsim nyog rau cov kev xav tau tshwj xeeb.

17-4PH (UNS S17400): Tus Qauv Kev Lag Luam

Kev sib xyaw:

• Cr: 15.0-17.5%
• Tsis muaj: 3.0-5.0%
• Kub: 3.0-5.0%
• Nb (Cb): 0.15–0.45%

Kev kho cua sov: Tshuaj kho thiab hnub nyoog (feem ntau H900 txog H1150-M)

Mechanical Properties (H900):

• Tensile zog: 1310 MPa
• Tawm Zog: 1170 MPa
• Elongation: 10%
• Hardness: ~ 44 HRC

Qhov zoo:

• Siab zog
• Nruab nrab corrosion kuj
• Zoo machinability
• Weldable

Daim ntawv thov:

• Aerospace Cheebtsam
• Nuclear reactors
• Valves, shafts, fasteners

Kev sib piv nrog lwm yam PH Stainless Steels

15-5PH (UNS S15500)

Kev sib xyaw:

• Zoo ib yam li 17-4PH, tab sis nrog kev tswj nruj dua ntawm impurities
• Cr: 14.0-15.5%
• Yog ': 3.5-5.5%
• Yog ': 2.5-4.5%

Qhov txawv tseem ceeb:

• Zoo dua transverse toughness vim finer microstructure
• Txhim kho cov khoom siv kho tshuab hauv cov ntu tuab

Siv Cases:

• Aerospace forgings
• Cov khoom siv tshuaj ua haujlwm

13-8Mo (UNS S13800)

Kev sib xyaw:

• Cr: 12.25-13.25%
• Yog ': 7.5-8.5%
• Mov: 2.0-2.5%

Qhov txawv tseem ceeb:

• Superior toughness thiab corrosion kuj
• Lub zog muaj zog ntawm cov ntu tuab tuab
• Tight muaj pes tsawg leeg tswj kev siv aerospace

Siv Cases:

• Structureal aerospace Cheebtsam
• High-kev ua tau zoo springs

17-7PH (UNS S17700)

Kev sib xyaw:

• Cr: 16.0-18.0%
• Yog ': 6.5-7.75%
• Cov ntsiab lus: 0.75-1.50%

Qhov txawv tseem ceeb:

• Semi-austenitic; yuav tsum tau ua haujlwm txias thiab kho cua sov
• Zoo formability tab sis qis corrosion kuj tshaj 17-4PH

Siv Cases:

• Aerospace diaphragms ua
• Hauv qab
• Springs

Kev Cai 465 (UNS S46500)

Kev sib xyaw:

• Cr: 11.0-13.0%
• Yog ': 10.75–11.25%
• Tus nqi: 1.5-2.0%
• Mov: 0.75-1.25%

Qhov txawv tseem ceeb:

• Ultra-siab zog (txog 200 ksi tensile)
• Zoo heev tawg toughness
• Tus nqi siab dua

Siv Cases:

• Cov cuab yeej phais
• Aircraft fasteners
• Landing gear Cheebtsam

Kev sib piv kev kho cua sov

Kev sib piv Corrosion Resistance

• Qhov zoo tshaj plaws:13-8Mo thiab Kev Cai 465
• Zoo:17-4PH thiab 15-5PH
• Ncaj ncees:17-7 PHN

Lus Cim: Tsis muaj qhov cuam tshuam rau kev tiv thaiv corrosion ntawm cov qib austenitic zoo li 316L.

Machinability thiab Weldability

Kev txiav txim siab nqi

• Tus nqi-zoo tshaj plaws:17-4 PAB
• Qib Premium:13-8Mo thiab Kev Cai 465
• Sib npaug:15-5 PHN

Kev sib piv

Cov ntsiab lus

Xaus

Thaum 17-4PH tseem yog qhov mus-rau PH stainless hlau rau ntau daim ntawv thov dav dav, txhua qib PH qib muaj qhov zoo sib xws uas ua rau nws zoo dua rau cov kev cai tshwj xeeb. Kev nkag siab txog cov nuances ntawm cov alloys no ua rau cov khoom siv engineers thiab cov neeg yuav khoom los txiav txim siab raws li lub zog, toughness, corrosion resistance, thiab nqi.