Are you clear that stainless steel pledges check flow is such?

Are you clear that stainless steel pledges check flow is such?

Stainless steel qualification should decide through the examination, undertake the pace goes pledging check is divided.
1, stainless steel board if be in,surface of the workpiece when heating adheres to oily, the oxidation skin ply of the oxidation skin ply of oily adherent place and other part and composition are different, and can produce cementite. Oxidation is hypodermic base metal will be eroded acerbitily by the part of cementite severely. The oil with the ejective place when heavy oil burner burns at first drips, if adhere to,go up in workpiece, the impact is very big also. So, operation high-ranking official does not use a hand to feel stainless steel directly, do not make workpiece is touched new smeary.

2, if workpiece surface has the adherent lube when cold working to wait, must be in solution of degreasing agent of 3 chloric ethylene, caustic soda sufficient and defatted hind reoccupy warm water is cleaned, have heat treatment again next.

3, stainless steel if the surface has sundry, especially on organic matter or grey adherent workpiece when, heat to be able to be opposite of course oxidation skin is influential.

4, the atmosphere inside the difference furnace of the atmosphere inside stainless steel furnace differs locally in each, the formation of oxidation skin also can have change, this also is the inhomogenous reason after causing pickling. So, when heat, the atmosphere of each place inside furnace must identical.

5, with heat the object that workpiece contacts directly, must pass sufficient drying ability to use. But, if stoving hind is placed below normal temperature, in humidity high case falls, moisture still can be condensed in workpiece apparently. So, had better be the drying before be being used.

There is the oxidation skin of remaining before, there are the place of oxidation skin remaining and the place that do not have oxidation skin after heating, the difference on the ply of skin of meeting occurrence oxidation and composition, the surface after causing pickling is inhomogenous, want to notice final heat treatment not only so, and also should notice intermediate heat treatment and pickling adequately.

The oxidation skin that produces has difference. So, must make handle a not direct contact when heat blaze mouth.

Useless stainless steel is advanced alloy steel, the value ratio is average useless steel wants tall, country is common when reclaim won't jumbly be together. But, the regular meeting of middling of scrap iron and steel that imports in abroad is a few jumblier useless stainless steel. Encounter such situation, we can use examine differentiating a method is:

1, distinguish: from tenacity and hardness? Bilge raw meat or fish of  of Ji of ǚ fine order holds? easy turn in the palm to break; chromium not easily not to become rusty useless steel sex is hard, be bungled attack can curved cannot break; nickel chromium not to become rusty useless steel sex is tough,

2, from fight: of the distinction on oxidisability? Bilge ǚ is fine? of  of  of faithful seed wholesale shows maize; chromium not to become rusty useless steel rusts; nickel chromium does not become rusty not easily useless steel rusts not easily.

3, distinguish: from color? Bilge after rust abandons steel pickling, chromium of? of childish of admonish of ǚ fine foot does not show white; not pickling shows chromium of nickel of palm black; silvery white; is not shown after rust abandons steel pickling not pickling shows palm white (color of darkly of steel of chromic manganese nitrogen, the gender is hard) ; cold rolling without anneal show silvery white, have glance, the gender is hard.

4, distinguish: from magnetism? Bilge dew of You of a pavilion or house on a terrace of kiss of the Kingdom of Wei of a surname of the fine Ji that treat Mi sends ǚ the Huaihe River of a drum used in the army in ancient China climbs chromium of   ? not to become rusty useless steel has magnetism, can be attracted by magnetite; nickel chromium does not become rusty useless steel falls in anneal condition, without magnetism. After cold working, it is to be able to have a bit magnetism,

5, distinguish: from burnish? Bilge ǚ is fine chromium of? of Xiang of discharge of  of wholesale of the  that treat honest does not become rusty useless steel is lacklustre; nickel chromium does not become rusty useless steel luster.

6, wipe discriminative: with bluestone? Bilge ǚ is fine chromium of? of warm up of breed head shrimp does not become rusty useless steel does not become angry; nickel chromium does not become rusty useless steel scrapes oxidation layer, drop a bit water, bluestone wipes changeless color.

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