Therefore, for direct

The pine forest form in steel is very difficult, and various forms of stability of acid of pine forest differed, which gives decomposition of borsoderzhashchy steel and definition some difficulties. Thus appears in the analysis of acid solvable pine forest and acid insoluble pine forest, distinction of full pine forest. Is it is not strictly defined in acidsoluble pine forest originally, but in general treats that part of pine forest for acid decomposition, because of type of acid, concentration and heating of various ways, often do results of the analysis of acidsoluble pine forest different. 1971 recommended, that homogeneous conditions of C 1/2H2SO4 5moll sulfuric acid without any oxidizer terminating a sample, the weighed pine forest was acid solvable pine forest. Acid solvable pine forest - mainly, firm solution of pine forest, an oxide of pine forest, iron carbonaceous compositions of pine forest; acid insoluble pine forest, mainly, pine forest oxide. As the oxide of pine forest has a high degree of stability, decomposition of acid insoluble pine forest in general use a sodium carbonate, плавят a method. Usually high alloyed steel, the superalloy based on nickel containing elements, such as niobium, tantalum, the titan, aluminum, proximity of nitrogen is much more, than pine forest and consequently seldom form the pine forest nitride, full volume of pine forest can be received by a sulfuric smoke. Carbonaceous steel, the low alloyed steel sometimes is available full volume of pine forest, sometimes settle down between acidsoluble pine forest and pine forest.

Therefore, for direct decomposition of acid and insoluble pine forest, still needs the majority of workers, continue to investigate. Besides, it was specified that though acidsoluble pine forest is not equal to effective pine forest, but to acidsoluble pine forest with good correspondence between hardenability, for the usual chemical analysis, analyze the acidsoluble pine forest, corresponding, but this offer, yet recognized, and thus the pine forest analysis, is still measured requirement, distinction between acid and insoluble pine forest.