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  当前位置 -> 行业资讯- 工业冷拔无缝钢管腐蚀表现在哪些地方 发布时间:(2018/12/21)

工业冷拔无缝钢管腐蚀表现在哪些地方


工业冷拔钢管的腐蚀主要表现在:冷拔钢管的一种严重的腐蚀形式是局部腐蚀(亦即应力腐蚀开裂、点腐蚀、晶间腐蚀、腐蚀疲劳以及缝隙腐蚀)。接下来冷拔无缝钢管厂家来重点的介绍下。冷拔无缝钢管是用来描述在整个合金表面上以比较均勺的方式所发生的腐蚀现象的术语。当发生全面腐蚀时,村料由于腐蚀而逐渐变薄,甚至材料腐蚀失效。

Corrosion of industrial cold-drawn steel pipes is mainly manifested in: a serious form of corrosion of cold-drawn steel pipes is local corrosion (i.e. stress corrosion cracking, pitting corrosion, intergranular corrosion, corrosion fatigue and crevice corrosion). Next, cold-drawn seamless steel pipe manufacturers to focus on the introduction. Cold-drawn seamless steel pipe is a term used to describe the corrosion phenomena occurring on the whole alloy surface in a relatively uniform manner. When the overall corrosion occurs, the village materials gradually become thinner due to corrosion, and even the materials become corroded and invalid. 

应力腐蚀开裂(SCC):是指承受应力的合金在腐蚀性环境中由于烈纹的扩展而互生失效的一种通用术语。应力腐蚀开裂具有脆性断口形貌,但它也可能发生于韧性高的材料中。发生应力腐蚀开裂的必要条件是要有拉应力(不论是残余应力还是外加应力,或者两者兼而有之)和特定的腐蚀介质存在。型纹的形成和扩展大致与拉应力方向垂直。这个导致应力腐蚀开裂的应力值,不锈钢工业焊管要比没有腐蚀介质存在时材料断裂所需要的应力值小得多。在微观上,穿过晶粒的裂纹称为穿晶裂纹,而沿晶界扩图的裂纹称为沿晶裂纹,当应力腐蚀开裂扩展至其一深度时(此处,承受载荷的材料断面上的应力达到它在空气中的断裂应力),则材料就按正常的裂纹(在韧性材料中,通常是通过显微缺陷的聚合)而断开。因此,由于应力腐蚀开裂而失效的零件的断面,将包含有应力腐蚀开裂的特征区域以及与已微缺陷的聚合相联系的“韧窝”区域。

Stress corrosion cracking (SCC) is a general term used to describe the alternating failure of stress-bearing alloys in corrosive environments due to the expansion of streaks. Stress corrosion cracking has brittle fracture morphology, but it may also occur in materials with high toughness. The necessary condition for stress corrosion cracking is the existence of tensile stress (whether residual stress or applied stress, or both) and specific corrosion medium. The ion and extension of the pattern are approximately perpendicular to the direction of tensile stress. This stress value, which leads to stress corrosion cracking, is much smaller than that required for material fracture without corrosive medium in stainless steel industrial welded pipe. Microscopically, cracks passing through grains are called transgranular cracks, while cracks extending along grain boundaries are called intergranular cracks. When stress corrosion cracks extend to a depth (where the stress on the load-bearing material section reaches its fracture stress in the air), the material breaks off according to normal cracks (in ductile materials, usually through the aggregation of micro-defects). Therefore, the section of the part which has failed due to stress corrosion cracking will contain the characteristic area of stress corrosion cracking and the "dimple" area associated with the aggregation of micro-defects.

点腐蚀:是一种导致腐蚀的局部腐蚀形式。

Point corrosion: A localized form of corrosion that results in corrosion.

晶间腐蚀:晶粒间界是结晶学取向不同的晶粒间紊乱错合的界城,因而,它们是钢中各种溶质元素偏析或金属化合物(如碳化物和δ相)沉淀析出的有利区城。因此,在某些腐蚀介质中,晶粒间界可能先行被腐蚀乃是不足为奇的。这种类型的腐蚀被称为晶间腐蚀,大多数的金属和合金在特定的腐蚀介质中都可能呈现晶间腐蚀。

Intergranular corrosion: Intergranular boundaries are the boundaries of disordered and mismatched grains with different crystallographic orientations. Therefore, they are favorable areas for the segregation of various solute elements or precipitation of metal compounds (such as carbides and delta phases) in steel. Therefore, it is not surprising that grain boundaries may be corroded first in some corrosive . This type of corrosion is called intergranular corrosion. Most metals and alloys may exhibit intergranular corrosion in a specific corrosion medium.

缝隙腐蚀:是局部腐蚀的一种形式,它可能发全于溶液停滞的缝隙之中或屏蔽的表面内。这样的缝隙可以在金属与金属或金属与非金属的接合处形成,例如,在与铆钉、螺栓、垫片、阀座、松动的表面沉积物以及海生物相接烛之处形成。

Crevice corrosion: A form of localized corrosion that may occur entirely in a solution-stagnated crevice or in a shielded surface. Such gaps can be formed at metal-to-metal or metal-to-metal joints, such as where rivets, bolts, gaskets, seats, loose surface sediments, and candles are joined to marine life.

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