The important effects of carbon on stainless steel

Carbon steel is used in industry, one of the main elements of the performance of the steel and organization to a large extent depends on the form of carbon content in steel and its distribution, the influence of the carbon in the stainless steel is particularly significant. Carbon impact to the organization in the stainless steel is mainly manifested in two aspects, on the one hand, carbon austenitic elements are stable, and the role of a large ( About 30 times of nickel) , on the other hand, due to the affinity of carbon and chromium is very big, and chromium form - Series of complex carbide. So, from both a strength and corrosion performance of candle, the role of carbon in stainless steel is contradictory. Understanding the influence of the rule, we can from the use of different requirements, choose different carbon content of stainless steel. The most widely used in industry, for example, is at the very least stainless steel - — Crl3 0 ~ 4 cr13 these five steel grade standard chrome gauge for 12 ~ 14%, is to put the carbon and chromium after the formation of chromium carbide factors into consideration, the purpose is to make the carbon and chromium as chromium carbide, the chromium content of solid solution is not less than 11. A minimum 7% chromium content. In terms of the five steel grade because the carbon content, strength and corrosion resistance are also differentiated, cr13 0 ~ 2 crl3 steel has good corrosion resistance strength less than 3 crl3 and 4 cr13 steel, used in the manufacture of structural parts, after two steel grade due to high carbon and high strength can be obtained much used in the manufacture of spring, knives and other required high strength and abrasion resistance parts. And as to overcome the 18-8 chromium nickel stainless steel intergranular corrosion, the carbon content of steel can be dropped to zero. Less than 03%, or greater than chromium and carbon affinity elements ( Titanium and niobium) , make it not chromium carbide formation, such as high hardness and wear resistance becomes main requirements, we can increase the carbon content of steel is properly increase the chromium content at the same time, do both meet the requirements of hardness and wear resistance, and both - Corrosion resistant function, industry is used as the bearing, measuring tool and cutting tool has a stainless steel 9 cr18 and 9 cr17movco steel, carbon content is up to 0. 85-0. The chromium content of 95%, because they also correspondingly raised, so still meet the requirements of the corrosion resistance. In general, for the application of stainless steel in the industrial carbon content is low, most of the carbon content of stainless steel in 0. 1 to 0. 4%, acid-resistant steel with carbon 0. 1 to 0. 2% of the majority. Carbon content is greater than zero. 4% of the stainless steel accounts for only a small part of the total number of steel grade, that is because in most of the use conditions, always is main purpose with corrosion resistant stainless steel. In addition, the low carbon content is also for some process requirements, such as easy to welding and cold deformation, etc.