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Giredhi Black Oxide Double-End Zvitutu
2026-07-21
Giredhi 8.8 dema oxide yakapetwa kaviri-magumo matudhi ari epakati-yakakwirira simba akarukwa zvisungo zvine shinda pamigumo yese ine isina kuverengwa shank centre. Iwo anosanganisa akavimbika emuchina kuita (800 MPa tensile simba), yehupfumi corrosion dziviriro kuburikidza neakatetepa Fe3O4 shanduko yekubatisa, uye inogoneka kuisirwa kwemaindasitiri muchina, mota, uye zvimiro zvekushandisa.
1. Grade 8.8 Classification
Per ISO 898-1, iyo "8.8" zita rinoreva zita rekusimba simba re800 MPa uye goho reshiyo ye0.8 (goho simba 640 MPa). Yakagadzirwa kubva kukadzimwa-uye-yakadzikama yepakati kabhoni alloy simbi, Giredhi 8.8 inopa yakanakisa simba-ku-mutengo-chiyero.
| Property | Value | Property | Value |
| Kusimba Simba (Rm) | 800 MPa | Min. Elongation | 12% |
| Goho Simba (ReL) | 640 MPa | Kuoma (HV) | 250-320 |
| Proof Load Stress | 600 MPa | Impact Toughness | 27 J |
Tafura 1 - Key Mechanical Properties (ISO 898-1)
2. Black Oxide Surface Kurapa
Black oxide (Fe3O4) ikemikari inoshandura coating 0.5-1.5 micrometers gobvu, inoumbwa nekunyudzwa mune inopisa alkaline nitrate bath pa 140-150C. Kusiyana ne electroplating, haikonzeri shanduko yedimensional uye hapana hydrogen embrittlement. Kana yakavharwa nemafuta ekudzivirira ngura, inopa kusvika maawa makumi mapfumbamwe nematanhatu ekusapfapfaidza munyu.
| Feature | Tsanangudzo |
| Coating Ukobvu | 0.5-1.5 um - hapana dimensional shanduko kune shinda |
| Corrosion Resistance | Pakati nepakati (96 maawa munyu pfapfaidzo kana yaiswa mafuta) |
| Chitarisiko | Uniform matte dema, nyanzvi yekupedzisira |
| Hydrogen Embrittlement | Hapana - hapana electroplating inobatanidzwa |
| Max Service Temperature | 250C inoenderera |
| Mutengo | Yakaderera pakati pezvakajairwa zvinodzivirira coatings |
Tafura 2 - Black Oxide Coating Properties
3. Double-End Stud Design
Chigadziko chechipiri chine pombi yepombi (yakaputirwa mugomba rakaputika) uye nut end (inogamuchira nut), inoparadzaniswa neshank isina kuverengwa. Iyo yepombi yekupedzisira kureba inowanzoita 1.0-1.5d uye nati inopera 2.0-3.0d, uko d ndiyo dhayamita yezita.
| Size | Pitch (mm) | Tap End | Nut End | Zvose L (mm) | Shank dia. (mm) |
| M8 | 1.25 | 1.0d | 2.0d | 50-120 | 8.0 |
| M10 | 1.5 | 1.25d | 2.0d | 60-150 | 10.0 |
| M12 | 1.75 | 1.25d | 2.5d | 70-200 | 12.0 |
| M16 | 2.0 | 1.25d | 2.5d | 80-250 | 16.0 |
| M20 | 2.5 | 1.5d | 3.0d | 100-300 | 20.0 |
Tafura 3 - Yakajairwa Metric Thread Tsanangudzo
Giredhi 8.8 dema oxide yakapetwa kaviri-yekupedzisira zvitubu zvinopa musanganiswa wakakwana wesimba, hupfumi, uye kuita zvakasiyana-siyana - zvichiita kuti ive sarudzo inosarudzika pamakina akajairwa, mota, kuvaka, uye petrochemical flange application.
Summary
8.8 giredhi maviri-ekupedzisira matudhi ane akakwirira-simba fasteners ane shinda pamativi ese uye shank yepakati. Per ISO 898-1: 800 MPa tensile simba, 640 MPa goho, 250-320 HV kuoma. Iyo yepombi inopera inobatirira mugomba rakadzvanywa uku iyo nut yekupedzisira ichibvumira kudzokororwa kusangana pasina base-tambo kupfeka. Mabhandi anowanikwa anosanganisira black oxide, zinc plating, hot-dip galvanizing, uye Dacromet yevarying corrosion protection. Yakanakira mabhuroko einjini, simbi yezvimiro, mapiping flanges, uye muchina weindasitiri uko kunodiwa simba repakati-pamusoro, reusability, uye mutengo-kubudirira.
