Raw material quality directly affectsDamping Hingeof quality

　　Damping HingePart of the raw material is the standard martensitic stainless steel, namely:403、410、414、416、416 (Se)、420、431、440A、440BAnd440CType, the corrosion resistance of these steels comes from "chromium", whose range is from11.5To18%, the higher the chromium content of steel required carbon content, to ensure that during heat treatment martensite formation, the above three kinds of440Stainless steel is rarely considered as a need for welding applications, and440The molten metal of the type composition is not easy to obtain.

Improved standard martensitic steels containing elements such as nickel, molybdenum, vanadium, etc., are mainly used to elevate the allowable working temperature of standard steel to a higher than1100K, when these elements are added, the carbon content also increases, as the carbon content increases, the problem of avoiding cracking in the hardening heat affected zone of the weld becomes more serious.

Martensitic stainless steel can be welded under annealing, hardening and hardening and tempering conditions, regardless of the original state of steel, after welding will produce a hardened martensite area near the weld path, the hardness of the heat-affected zone depends mainly on the carbon content of the base metal, and when the hardness increases, the toughness decreases, and the area becomes more prone to crack, Preheat and control interlayer temperature, is the most effective way to avoid cracking, for the best nature, the need for post weld heat treatment. Martensitic stainless steel is a kind of stainless steel which can be adjusted by heat treatment (quenching and tempering), which is a kind of stainless steel which can be hardened in layman's terms.

　　Damping HingeThis characteristic determines that this kind of steel must have two basic conditions: first, in the equilibrium phase diagram must have the austenite phase region exists, in the region temperature range for a long time heating, so that carbide solid solution to the steel, the quenching to form a martensite, that is, chemical components must be controlled inγ or γ+α-phase region, the second is to make the alloy to form corrosion-resistant and oxidation of the passivation film, chromium content must be in10.5%Above.

According to the difference of alloying elements, can be divided into martensite chromium stainless steel and martensite chromium-nickel stainless steel. The main alloying elements of martensitic chromium stainless steels are iron, chromium and carbon.Fe-crThe Touffou Iron section of the system, asCrGreater than13%, there is no gamma phase, this kind of alloy is Tanshanti body alloy, in any heat treatment system can not produce martensite, for this mustFe-crThe austenite element is added to the binary alloy to enlarge the gamma phase, and for martensite chromium stainless steel,C、Nis a valid element,C、NThe addition of elements allows for higher chromium content in the alloy. In martensite chromium stainless steel, in addition to chromium,Cis another of the most important essential elements, in fact, martensite chromium stainless steel is a kind of iron, chromium, carbon ternary alloy. Of course, there are other elements that use these elements that can be based onSchaefflerFigure to determine the approximate organization.

　　Damping HingeMartensite stainless steel is mainly chromium content in12%-18%Range of low carbon or high carbon steel.