Is mill scale hazardous?

Is mill scale hazardous?

2(a) Classification of the Chemical: Mill Scale is considered a hazardous material according to the criteria specified in REACH [REGULATION (EC) No 1907/2006] and CLP [REGULATION (EC) No 1272/2008] and OSHA 29 CFR 1910.1200 Hazard Communication Standard.

What is mill scale cargo?

Mill scale – a scale cargo collected from water used in hot rolling process and drainage pits, with small amount of oil ( used for rolling) is a main component of this cargo. Scale cargo has colour ranging from gray, ash brown, ash black green, brown, burnt umber to black.

How is mill scale produced?

Mill scale is formed on the outer surfaces of plates, sheets or profiles when they are being produced by rolling red hot iron or steel billets in rolling mills. Mill scale is bluish-black in color. Mill scale generated in rolling mills will be collected and sent to a sinter plant for recycling.

Does mill scale prevent rust?

They form a protective thick film on rust constructions, are used under particular conditions in the atmosphere, water, and fuels. They might not however be very suitable for long term corrosion protection of the steel structures, say for years and decades.

Do I need to remove mill scale before painting?

Mill scale is a type of iron oxide that is formed on the surface of the steel during the hot-rolling process. The very high surface temperature combined with high roller pressures result in a smooth, bluish grey surface. CAN I PAINT OVER MILL SCALE? All mill scale must be removed to present a uniform and clean surface.

Is mill scale a waste?

Mill scale is one of waste materials which is produced as a result of hot rolling of steel in all steel companies. On the other hand, mill scale is considered a rich iron source with minimum impurities.

Does paint stick to mill scale?

Removal of mill scale is virtually impossible by hand, and extremely tedious and time-consuming using power tool cleaning methods. Painting over mill scale, however tempting, is a futile exercise, as the presence of mill scale on the steel surface accelerates the corrosion of the underlying steel.

Should you remove mill scale before welding?

Also with this process you have more arc spread (read: a higher arc tension) which makes the weld flow slightly better. Again, the weld remains too convex and there are many silicates on the weld. In all cases it remains necessary to remove the mill scale before welding.

Should I remove mill scale before welding?

Why is applying paint directly over mill scale a waste of time?

Any paint or protective coating applied over mill scale is wasted, since the paint/coating will come off with the mill scale as moisture-laden air gets under it and when the mill scale breaks off the steel.

Can a mill scale be shipped in a dry condition?

Even though Mill scale is normally carried in a dry condition with moisture content below its TML, it is a cargo that could liquefy and hence should be treated as a a Group A cargo under the said Code, i.e. a cargo that may liquefy if shipped at a moisture content in excess of its transportable moisture limit (TML).

What kind of cargo is a mill scale?

According to the latest issue of the London P&I Club’s Stop Bulletin, Mill scale is increasingly traded as a bulk cargo these days.

What are the qualities of a mill scale?

As mill scale is a quite uncommon cargo, knowledge of its qualities is scarce. However, for practical purposes, the cargo can be compared with iron ore fines. It possesses a Transportable Moisture Limit (TML) and is liable to liquefy and/or form a wet base unless appropriate measures are taken.

Why is mill scale considered an industrial waste?

Mill scale though has a high level content of iron (68 % -72 %) yet it is still considered as an industrial waste in the form of iron oxide mainly because it gets contaminated with water and oil during the process of rolling.