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  2. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    Various colors on stainless steel 18 Cr / 8 Ni 7.5 g of sodium dichromate , 1000 mL of sulfuric acid (1.24 g/cm 3 ), lead cathodes, object as an anode, 70-90 °C temp, 0,06 A/dm 2 , voltage 1.3 V – colors depend on the duration of the procedure (5-50 min.), brown, blue, reddish brown, yellow, green.

  3. Conservation and restoration of iron and steel objects

    en.wikipedia.org/wiki/Conservation_and...

    Iron, steel, and ferrous metals constitute a large portion of collections in museums. The conservation and restoration of iron and steel objects is an activity dedicated to the preservation and protection of objects of historical and personal value made from iron or steel. When applied to cultural heritage this activity is generally undertaken ...

  4. How to Pick Deck Stain Colors to Transform Your Outdoor ...

    www.aol.com/news/pick-deck-stain-colors...

    Learn how to choose deck stain colors, including the right opacity, for a look you love. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways ...

  5. Steel grades - Wikipedia

    en.wikipedia.org/wiki/Steel_grades

    In addition to the descriptive steel grade naming system indicated above, within EN 10027-2 is defined a system for creating unique steel grade numbers. While less descriptive and intuitive than the grand names they are easier to tabulate and use in data processing applications.

  6. History of the iron and steel industry in the United States

    en.wikipedia.org/wiki/History_of_the_iron_and...

    Cleveland had nine integrated steel mills in the 1970s. US Steel closed one mill in 1979, then shut down its six remaining Cleveland mills in 1984. Cleveland's two remaining steel producers, Republic Steel and Jones & Laughlin, merged to form LTV Steel in June 1984. LTV Steel declared bankruptcy in 2000.

  7. History of the steel industry (1850–1970) - Wikipedia

    en.wikipedia.org/wiki/History_of_the_steel...

    Steel is an alloy composed of between 0.2 and 2.0 percent carbon, with the balance being iron. From prehistory through the creation of the blast furnace, iron was produced from iron ore as wrought iron, 99.82–100 percent Fe, and the process of making steel involved adding carbon to iron, usually in a serendipitous manner, in the forge, or via the cementation process.

  8. Past tense - Wikipedia

    en.wikipedia.org/wiki/Past_tense

    The past tense of regular verbs is made by adding -d or -ed to the base form of the verb, while those of irregular verbs are formed in various ways (such as see→saw, go→went, be→was/were). With regular and some irregular verbs, the past tense form also serves as a past participle. For full details of past tense formation, see English verbs.

  9. English irregular verbs - Wikipedia

    en.wikipedia.org/wiki/English_irregular_verbs

    In some verbs, the past tense, past participle, or both are identical in form to the basic (infinitive) form of the verb. This is the case with certain strong verbs, where historical sound changes have led to a leveling of the vowel modifications: for example, let has both past tense and past participle identical to the infinitive, while come ...

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