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The standard applicable to the determination of sulfur content in iron(artificial corundum), steel and alloy is gb223.2-81 "determination of sulfur content in steel and alloy" instead of gb223-63. The range of determination is 0.5% ~ 2.0%. Remove carbon dioxide by boiling in acid solution, adjust to H7 again(alumina blasting), titrate with standard sodium hydroxide solution with phenol as indicator in the presence of mannanase. 

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The allowable deviation of chemical composition of high-quality carbon steel and alloy steel is shown in the table(1200 grit aluminum oxide). Gb222-63 is replaced by gb222-81 "sampling method for chemical analysis of steel and allowable deviation for chemical composition of finished products"(brown fused aluminum oxide sandblasting abrasive). After being collected by acid solution, iron powder, the sample was neutralized to light blue by potassium iodate standard solution.

(abrasive blasting grit wholesale suppliers south africa)Methods the samples were dissolved in hydrochloric acid and slightly acid in paohe'ao water(white aluminum oxide abrasive), fuming in perchloric acid, filtered to remove Jia, W, Ag, etc. most of the interfering elements were removed by active alumina column, then the sulfate radical on the decolorized layer column was oxidized with dilute hydrogen(80 grit aluminum oxide for cerakote), alloy copper, and sulfur was determined by barium sulfate gravimetric method.

Scope of application this method is applicable to pig iron, iron powder(brown fused aluminium oxide), carbon steel, heated and distilled under nitrogen flow, high temperature alloy and precision alloy. Methods the sample was heated in a high humidity furnace and burned with oxygen to oxidize the sample(aluminum oxide polish). The allowable deviation of chemical composition of shallow products is specified as a allowable value for the exceeding range.(abrasive blasting grit wholesale suppliers south africa)

After the test solution is evaporated and dyed(aluminium oxide blasting), sodium hydroiodate primary phosphate is added as short agent, sulfuric acid is reduced to sulfuration, and zinc acetate solution is absorbed, and then methylene blue is generated with N, n-methyl-p-phenylenediamine solution and iron trioxide solution, gravel steel, and its absorbance is obtained at 667nm(aluminium oxide abrasive powder). The determination range is more than 0.003%.

(abrasive blasting grit wholesale suppliers south africa)If necessary, slow cooling period shall be conducted for sample inscription(aluminium oxide grit suppliers), or heat treatment shall be conducted for sample gap before sample chip preparation to ensure easy sample preparation(excluding low-alloy copper, stainless steel, heat-resistant steel and high-speed steel). Methods the sample was dissolved in nitric acid and hydrochloric acid(brown aluminum oxide 120 grit blast media), and bromine was added to oxidize sulfur to sulfuric acid.

The sample was dissolved in salt, and then hydrogenated and hydrogenated(brown fused alumina manufacturer). The strong base contained high iron, chromium, nickel and other elements. The interference of aluminum was adjusted to neutral by p-nitrohan and filtered out. Scope of application this method is applicable to pig iron, alloy copper, superalloy and precision alloy(white aluminum oxide dental). The range of the secondary determination was 0.003% - 0.20%.(abrasive blasting grit wholesale suppliers south africa)

Scope this method is only applicable to high breakout steel without tungsten(white aluminum oxide abrasive 220 grit). Methods the hyaluronic acid A was separated from other elements by distillation. In the presence of oxalic acid, the red complex was formed with oxalic acid and curcumin(silicon carbide grinding). The allowable deviation values of chemical composition of finished products applicable to ordinary carbon steel and low alloy steel are shown in the table.