Dab tsi yog qhov tshwj xeeb annealing kub thiab sijhawm rau SPA-H weathering steel?

Jan 20, 2026 Tso lus

Annealing parameters rau SPA-H weathering steel yogtied los ntawm annealing hom( txheej txheem annealing rau txias - dov ductility restoration, tag nrho annealing rau siab tshaj plaws formability) thiabhlau thickness(qhov tseem ceeb tshaj plaws rau lub sijhawm tuav), nrog rau qhov kub ntawm 650-850℃thiab tuav lub sij hawm xam los ntawm tuab. Hauv qab no yog kev lag luam- tus qauv, kev ua haujlwm tsis zoo rau ob daim ntawv thov kev sib tsoo ntau tshaj plaws rau SPA-H:

1. Txheej txheem Annealing (Feem ntau)

Lub hom phiaj: Relieve txias dov ua hauj lwm hardening, restore ductility thaum khaws cia ib nrab txias-rolled zog/precision (rau nyias -gauge SPA-H 1.6–10 mm)

Kub: 650-750 degree(subcritical annealing, hauv qab austenitization ~ 850 degree)

Tuav Sijhawm: 1-2 feeb ib hli tuab(tsawg kawg 30 mins rau nyias cov ntsuas<3 mm)

Txias: Rauv cua txias (qeeb) lossis cua txias (rau- qhov yuav tsum tau ua kom tsawg)

Piv txwv: 6 hli txias-rolled SPA-H → 680℃+ 6–12 mins tuav + rauv txias

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2. Tag Nrho Txhua Yam

Lub hom phiaj: Maximize ductility/formability, fully eliminate work hardening (for thick-gauge SPA-H >10 mm los yog hnyav txias -tsim qhov chaw)

Kub: 780-850 degree(ze / tseem ceeb austenitization, rau tag nrho cov nplej recrystallization)

Tuav Sijhawm: 2-3 feeb ib hli tuab (minimum 1 hour for thick gauges >25 hli)

Txias: Lub tshuab cua txias qeeb (tsawg dua lossis sib npaug li 50℃/ teev) mus rau chav tsev kub (tsis txhob rov- tawv)

Piv txwv: 20 hli txias-rolled SPA-H → 820℃+ 40–60 mins tuav + qeeb cub txias

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3. Cov cai tseem ceeb Universal

Cua sov tus nqi: ≤150°C/hour for thick gauges (>25 hli) los tiv thaiv thermal stress/cracking; tsis muaj kev txwv nruj rau nyias gauges (<10 mm).

Kev tsis sib xws: Xyuas kom tag nrho SPA-H workpiece ncav cuag qhov kub ntawm lub hom phiaj (tseem ceeb rau kev hloov pauv khoom vaj khoom tsev).

Tshaj tawm -Kev sib tw: Tsis xav tau kev kho mob ntxiv -kev npaj saum npoo (sib tsoo/sandblasting) tsuas yog rau patina uniformity nyob rau hauv daim ntawv thov sab nraum zoov.

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