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Qib 8.8 Dacromet Hex Bolt –IN 933 | ISO 4014 | Tag Nrho Cov Xov Hexagon Bolt nrog Dacromet Anti-Corrosion Txheej
2026-07-06 : kuv
Qib 8.8 Dacromet DIN 933 hex ntsia liaj qhov rooj sib txuas nruab nrab-siab txhua yam muaj zog nrog kev lag luam-kev tiv thaiv corrosion. Dav siv nyob rau hauv sab nraum zoov cov qauv steelwork, cua zog, railway infrastructure, thiab choj kev tsim kho, lub fastener no muab txhim khu kev qha clamping kev ua tau zoo raws li xav tau ib puag ncig tej yam kev mob - tsis muaj hydrogen embrittlement kev pheej hmoo cuam tshuam nrog electroplated lwm txoj.
Ntu 1 — Nkag siab Qib 8.8
Raws li ISO 898-1, cov cuab yeej hauv chav kawm tsim ntawm lub bolt muaj ob tus lej sib cais los ntawm tus lej lej. Rau Qib 8.8:
Thawj tus lej (8): Qhia 1/100 ntawm nominal tensile lub zog nyob rau hauv MPa - piv txwv li, yam tsawg kawg nkaus tensile zog = 800 MPa.
Tus lej thib ob (8): Qhia qhov piv ntawm qhov tsawg kawg nkaus lub zog rau qhov tsawg kawg nkaus tensile zog × 10 - piv txwv li, yield ratio = 0.80, lub ntsiab lus tsawg kawg nkaus yield zog = 640 MPa.
Mechanical Properties
| Khoom | Tus nqi | Txuj | Txoj Kev Xeem |
| Tensile zog (min.) | 800 MPa | TS EN ISO 898-1 | Tensile xeem |
| Yield zog (min.) | 640 MPa ua | TS EN ISO 898-1 | Tensile xeem |
| Pov thawj Load Stress | 580 MPa rau | TS EN ISO 898-1 | Pov thawj load |
| Yield Ratio | 0.80 | TS EN ISO 898-1 | Kev suav |
| Hardness (Vickers) | 245–335 HWV | ISO 6507 Kev Tswj Xyuas | Vickers xeem |
| Hardness (Rockwell) | 22-32 HRC | ISO 6508 Kev Tswj Xyuas | Rockwell xeem |
| Elongation ntawm Break (min.) | 12% | TS EN ISO 898-1 | Tensile xeem |
| Impact Toughness (min.) | 52 J @ -20 ° C | TS EN ISO 898-1 | Charpy xeem |
Qib 8.8 fasteners yog tsim los ntawm nruab nrab-carbon steel (piv txwv li, 45 # / SAE 1045) lossis cov hlau tsis tshua muaj hlau (piv txwv li, 40Cr / SCM435) thiab raug rau quenching thiab tempering (Q&T) kev kho cua sov kom ua tiav qhov yuav tsum tau muaj zog profile. Kev sib xyaw ua ke ntawm lub zog tensile siab thiab kev tswj hwm qhov sib piv ua rau Qib 8.8 bolts txhim khu kev qha hauv kev sib txuas ua ntej kev sib txuas.
Tej daim ntawv thov teb
Kev tsim kho steel: Structure bolting hauv thav duab, kab teeb, trusses (BS EN 14399 / ASTM A325-sib npaug).
Infrastructure: Choj decking, crane rails, txoj kev loj guardrails, expansion pob qij txha.
Renewable zog: Cua turbine ntauwd puag sib txuas, hnub ci mounting qauv.
Tshuab: General-purpose machinery thav duab, khoom siv ua liaj ua teb, khoom siv.
Automotive (tsis tseem ceeb): Chassis mounting, lub cev-rau-ncej, lub cav tsheb txhawb nqa.
Tshooj 2 - DIN 933 Hex Bolt Standard
DIN 933 (Deutsches Institut für Normung, German Standards Institute) txhais cov kev xav tau ntawm qhov ntev thiab geometric rau tag nrho threaded hexagon bolts nrog ntxhib metric suab threads. Txawm hais tias feem ntau cuam tshuam los ntawm ISO 4017 ntawm qib thoob ntiaj teb, DIN 933 tseem yog qhov tseem ceeb tshaj plaws hauv European thiab thoob ntiaj teb kev lag luam kev lag luam.
Cov yam ntxwv tseem ceeb ntawm DIN 933
Tag nrho xov: Lub bolt yog threaded raws nws tag nrho shank ntev - maximizing xov kev koom tes thiab load faib.
Hexagonal taub hau: Standard dav-dav-flats dimension tso cai rau siv nrog tus qauv metric spanners thiab socket wrenches.
Coarse thread suab: Metric ntxhib suab (raws li ISO 261) rau kev sib dhos ceev thiab tsis kam rau xoob hauv kev vibration.
Dimensional kam rau ua: Cov khoom qib A (m ≤ 10d lossis ≤ 150 mm) thiab cov khoom qib B (qhov loj dua) rau ISO 4759-1.
DIN 933 Dimension Reference Table
Kos Npe
DIN 933 Qib 8.8 bolts yog lub taub hau cim nrog cov khoom vaj khoom tsev cim "8.8" thiab cov chaw tsim khoom cov cim cim. Thaum Dacromet-coated, ib qho ntxiv cim lossis cim npe yuav qhia txog kev kho saum npoo.
Ntu 3 - Dacromet Corrosion Protection
Dacromet (tseem sau li Dacrotised los yog DACROMET®) yog ib qho chromate-free, zinc-and-aluminium flake-based water-borne txheej thev naus laus zis yog tsim los ntawm Pob Zeb Diamond Shamrock Chemicals. Nws muab kev tiv thaiv corrosion zoo heev thiab tau dhau los ua qhov kev kho mob saum npoo zoo rau Qib 8.8 bolts siv rau sab nraum zoov thiab kev ua phem-ib puag ncig.
Dacromet ua haujlwm li cas
Cov txheej txheej muaj ntau qhov sib tshooj zinc thiab txhuas flakes ua ke los ntawm ib qho inorganic chromate-based binder matrix, siv los ntawm dip-spinning thiab kho ntawm kwv yees li 300 ° C. Cov txheej txheej microstructure tsim ib txoj kev tortuous rau corrosive agents, muab ob qho tib si barrier thiab sacrificial (galvanic) tiv thaiv:
Barrier tiv thaiv: Dense, overlapping flake layers physically block moisture and chloride ions from reaching the steel substrate.
Sacrificial (galvanic) tiv thaiv: Zinc flakes yog electrochemically tsawg tshaj li hlau; lawv corrode preferentially, tiv thaiv raug cov npoo ntawm qhov chaw txiav thiab puas.
Cov nyhuv kho tus kheej: Zinc corrosion khoom ib feem kaw me me txheej tsis xws luag, ncua kev tiv thaiv lub neej.
Cov ntaub ntawv tseem ceeb
| Khoom | Dacromet | Kub-dip Galvanizing | Zinc Electroplating | Phosphating |
| Ntsev Txau Resistance | ≥ 480 h (tuaj yeem ncav cuag 1000 + h) | 200-500 h | 96-120 : kuv | <72 hnub |
| Txheej Thickness | 6-10 µm | 50-100 µm | 5-15 µm | 5-15 µm |
| Hydrogen embrittlement | Tsis muaj (tsis tas yuav ci) | Tsis muaj | Kev pheej hmoo siab | Kev pheej hmoo tsawg |
| Xov Tolerance | Tsis muaj teeb meem (thin coat) | Feem ntau cuam tshuam | Feem ntau OK | Feem ntau OK |
| RoHS / REACH Raws Cai | Yog (hexavalent-Cr-dawb) | Yog lawm | Ntau yam | Yog lawm |
| Daim ntawv thovs | Sab nraum zoov qauv, cua ntauwd, choj | Hnyav sab nraum zoov | Sab hauv / teeb | Sab hauv |
Ntsev tshuaj ntsuam raws ISO 9227. Hom Dacromet thickness: 6-10 µm. Cov txiaj ntsig tuaj yeem sib txawv nrog cov qauv tsim tshwj xeeb thiab daim ntawv thov.
Siv tau Standards & Specifications
ISO 10683: Tsis siv hluav taws xob siv zinc flake coatings rau fasteners.
TS EN ISO 10683: Kev lees paub European ntawm ISO 10683.
ASTM F1136 Cov Lus Qhia: Zinc / aluminium corrosion-tiv thaiv txheej rau fasteners.
VDA 235-104: German automotive standard rau zinc flake coatings.
Hais txog Fujirui Hlau - Professional Fastener Chaw Tsim Tshuaj & Exporter
Fujirui Hlau manufactures thiab xa tawm precision fasteners nrog rau Qib 8.8 / 10.9 / 12.9 hex bolts, DIN 933 tag nrho-xov bolts, DIN 931 ib nrab xov bolts, stud bolts, thiab kev cai fasteners. Cov kev kho deg muaj xws li Dacromet, Ruspert, kub-dip galvanising, thiab zinc electroplating. Tag nrho cov khoom yog tsim los rau ISO, DIN, thiab ASTM cov qauv nrog tag nrho cov ntaub ntawv xeem daim ntawv pov thawj (MTC).
