1, nodular casting surface dust

Steel casting production is often in the dust of the ground, in
the air with a lot of dust, they constantly fell on the
equipment surface. They can use water or alkaline solution to
get rid of. However, there is adhesion of grime need high
pressure water or steam to clean up.
2, nodular iron casting surface floating iron powder or
embedded iron
On any surface, free iron will rust and corrosion caused by
stainless steel. Therefore, we must clear. Floating powder can
generally be together with the dust remove. Some adhesion is
strong, according to the embedded iron processing. In addition
to the dust, the surface of iron sources, including many with
plain carbon steel wire brushing and used in plain carbon steel,
low alloy steel or cast iron pieces of the used sand, glass
beads or other abrasive for peening processing, or in the
stainless steel parts and equipment to nearby of the above
mentioned the stainless steel products for grinding. Next
material or hanging over process if no stainless steel take
protective measures, steel wire rope, sling and table on the
surface of the iron easily embedded or polluted surface.
Order requirements and production inspection can prevent and
found that the presence of free iron, ASTM standard A380 [3]
stipulated check stainless steel surface iron or steel particle
rust test. When demands absolute can't have iron exists, should
use this test method. If the result is satisfactory, the
application of clean water or nitric acid on the surface for
washing, until dark blue disappear completely should be do.
As standard A380 [3] pointed out if rust test solution can't
clear all clean, do not recommend in equipment technology
surface, that is used to produce human consumer goods direct
contact with the surface of the test method.
The simpler test method is in the water exposure 12 ~ 24 hours,
check if there is a rusty spot. This test sensitivity is poor,
and time-consuming. These are tests, not cleaning method. If you
find any iron, there must be introduced behind the chemical and
electrochemical method to clean up.
3, nodular casting lines
In order to prevent technology lubricant or product and/or waste
product stay, have to scratch and other rough surface mechanical
cleaning.
4, nodular casting rusty spot
Before making or production process sometimes see stainless
steel product or equipment rust, it shows that surface serious
pollution before it was put to use. The equipment must be remove
rust, thoroughly cleared surface should be through the iron test
and/or water test Inspection.
5, coarse grinding and machining
Grinding and machining can cause surface rough, leave grooves,
overlapping and defects such as burr. Each defect may also make
metal surface damage to a certain depth, that damaged the metal
surface can't through the pickling, electrolytic polishing or
peening method clear. Rough surface can be happened corrosion
and the birthplace of sedimentary products, heavy preweld
cleaning weld defects or remove excess weld strengthen high can
use coarse grinding ground. A kind of circumstance, should be to
use fine abrasive grinding
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