Dɛn ne aduan a ɛyɛ dade a ɛnyɛ den?
Food grade stainless steel no ne 'nnipa Republic of hyia . China National Standard GB9684' dade a ɛnyɛ den no Nneɛma a ɛwɔ lead chromium mu no sua koraa sen stainles s dade a ɛyɛ mmerɛw no.
Nsɛnkyerɛnnede a wɔde kyerɛ: dade a ɛnyɛ den a wɔde yɛ aduan no kyerɛ ɔfã a ɛne nnuan a wɔde di dwuma wɔ aduan mu no di nkitaho, na ɛsɛ sɛ aduan no di ahobammɔ ho ahwehwɛde ahorow bi ho dwuma. Efisɛ sɛ wode aduan mu acid a wɔyɛ no pii bedi dwuma , chromium stainless steel , unqualified stainless steel , bɛtew chromium bo ahorow so , awuduru;ne ahwehwɛde ahorow a ɛbɛma wɔatumi asiw kɔbere, cadmium ne nneɛma afoforo a wɔde yɛ efĩ ano hye.
Nsonsonoe a ɛda aduan a wɔde dade a ɛnyɛ den ayɛ ne dade a ɛnyɛ den 304 ntam : wɔde di dwuma dade a ɛnyɛ den a Heavy metal migration amount boro gyinapɛn no so, betumi apira nnipa akwahosan. Enti, ɛsɛ sɛ dade a ɛnyɛ den a wɔde noa aduan a wɔyɛ no ma ɛkari pɛ wɔ nsɛe ne ahobammɔ ntam. Sɛ nickel ne chromium a ɛwɔ mu no yɛ kɛse a, corrosion resistance no yɛ kɛse, nanso nickel ne chromium precipitates dodow nso bɛkɔ soro, a ɛma ahobammɔ ho asiane no kɔ soro.Esiane eyi nti, 'stainless steel products' (GB9684-2011-2011) National Food Safety Safety Standard , Cookers Chromium, Leip defiles.
Dɛn nti na ɔman gyinapɛn no nkyerɛ manganese a wotu kɔtra baabi foforo no anohyeto?
Ade biako nti a ɛte saa ne sɛ, bere a manganese a ɛwɔ dade a ɛnyɛ den mu no kɔ soro no , ne nsɛe a ɛko tia ne sɛnea ɛyɛ den sɛ ɛbɛbɔ no nso kɔ soro. Sɛ manganese no mu nsɛm no du baabi pɔtee bi a, wontumi mfa ade no nyɛ aduannoa nneɛma anaasɛ dade a ɛnyɛ den a wɔde noa aduan. Nanso wɔ manganese dodow a ɛkɔ soro saa mpo mu no, mpɛn pii no, akwahosan so nkɛntɛnso biara nni hɔ. Enti bere a ɔman no aduan ho ahobammɔ gyinapɛn ahorow nhyɛ manganese dodow ho mmara no, wɔkyerɛ sɛ ɛsɛ sɛ wɔde dade a ɛnyɛ den na ɛyɛ aduan a wɔde yɛ nneɛma no fã titiriw no sɛnea ɔman no gyinapɛn ahorow kyerɛ no.
Gyinapɛn pɔtee .
Ɛsɛ sɛ nneɛma ahorow a wɔde sie nnuan ne mfiri a wɔde yɛ aduan nyinaa paw austenitic anaa ferritic stainless steel (1cr18ni9ti,0cr19ni9, 1cr18ni9, 1cr17ni2). Wɔ adwinnade a wɔde tutu fam no fã a wɔde yɛ adwuma no nso betumi apaw Martensianite dade a ɛnyɛ den (0CR13, 1CR13, 2CR13, 3CR13).
Nneɛma pɔtee a wɔde kyerɛ honam fam ne nnuru te sɛ nea edidi so yi:
Ade Austenitic dade a ɛnyɛ den ferritic martensitic dade a ɛnyɛ den .
kɔbere (wɔ PB mu), mg/L 4% acetic acid a wɔde hyɛ mu ≤ 1.0 1.0.
Chromium (wɔ Cr), Mg/L 4% acetic acid a wɔde hyɛ mu ≤ so. 0.5
Nickel (wɔ Ni mu), Mg/L 4% Acetic Acid Soaking Solution ≤ 3.0 1.0.
Cadmium (wɔ CD mu), mg/L 4% acetic acid solution ≤ 0.02 0.02.
arsenic (AS), Mg/L 4% Acetic Acid Solution ≤ 0.04 0.04.
Hyɛ no nsow: Wɔnoa soaking tebea nyinaa ma 30min na afei dan mu hyew 24h.
Aduan grade stainless dade . Welded pipe no wɔ dwumadie ahodoɔ pii, wɔ ahwehwɛdeɛ no mu ne akyi nyinaa. Stainless steel welded pipe welding treatment yɛ ade titiriw paa, 0.5mm nso betumi anya nkɛntɛnso a ɛwɔ mu casting.
Sɛ ɛyɛ aduan grade stainless steel welded paipu wɔ tebea a ɛfata mu a, ɛsɛ sɛ wɔtow gu mu ne akyi, bere koro no ara mu . weld grinding na . annealing a ɛyɛ hyew . Hia a ɛho hia sɛ wɔyɛ mu ne akyi polishing no ne ɔfasu no mu duru nni hwee yɛ, ɛne application tebea no nkutoo. Ɔfasu no mu duru yɛ teateaa dodo ma emu casting no nyɛ ɔhaw kɛse dodo, efisɛ akyi casting betumi ayɛ low pass rate.
Sɛ ɛyɛ welded pipe , ɛnyɛ asɛm wɔ mu ne akyi. Afei nso hwɛ wo tube no ntwemu. Seamless tube ntumi ntow mu. Worentumi nka sɛ ɔfasu no mu duru a ɛyɛ 0.5 no yɛ teateaa dodo. Efisɛ sɛ wowɔ ɔfasu a ne kɛse yɛ mita biako a ne kɛse yɛ mita biako a, wɔrenhu, na ɛnyɛ sɛ wobɛmia so. Enti egyina wo tube no kɛse so.
Ebia wo paipu no tenten dodo, ɔfasu no mu duru yɛ teateaa dodo, efisɛ emu ne akyi polishing ne sɛ wubehu sɛnea wɔde set no di dwuma, wunni ahwehwɛde a ɛkorɔn saa, ɛho nhia sɛ wobɛma ɛka a ɛho nhia no akɔ soro.
