欧美乱码伦视频免费_色琪琪www618seon_日本免费a∨片免费_久久久夜色精品亚洲a_午夜性大片_亚洲综合精品伊人久久

How to select valve material under high temperature condition?

Column:Technical article Time:2021-03-19
Working condition of high temperature including high temperature, high temperature Ⅰ Ⅱ, high temperature, high temperature Ⅲ Ⅳ, high temperature, high temperature Ⅴ level...

Working condition of high temperature including high temperature, high temperature Ⅰ Ⅱ, high temperature, high temperature Ⅲ Ⅳ, high temperature, high temperature Ⅴ level, the following were introduced.

1, Sub-high temperature

Sub-high temperature refers to the valve operating temperature in the 325 ~ 425℃ region.If the medium is water and steam, mainly use WCB, WCC, A105, WC6 and WC9.If the medium is sulfur-containing oil, mainly with anti-sulfide corrosion of C5, CF8, CF3, CF8M and CF3M, etc.They are commonly used in oil refinery atmospheric and vacuum units and delayed coking units. At this time, the valves made of CF8, CF8M, CF3 and CF3M are not used for corrosion of acid resistant solutions, but for sulfur- containing oil and gas pipelines.In this working condition, the upper limit of the maximum operating temperature of CF8, CF8M, CF3 and CF3M is 450℃.
 

2, High temperature Ⅰ level   

Valve working temperature is 425 ~ 550 ℃ for high temperature when Ⅰ level (PI).Grade PI valve body material as the CF8 ASTMA351 standard as the fundamental form of "high temperature Ⅰ level of carbon chromium nickel titanium rare earth high quality heat resistant steel".Because PI grade is a specific name, here includes the concept of high temperature stainless steel (P).Therefore, if the working medium is water or steam, although high temperature steel WC6(T ≤540℃) or WC9(T ≤570℃) can also be used, although high temperature steel C5(ZG1Cr5Mo) can also be used in sulfur containing oil products, but here can not be called PI level.

3, High temperature Ⅱ level

Valve working temperature is 550 ~ 650 ℃, as the high temperature Ⅱ level (hereinafter referred to as the P Ⅱ level).P Ⅱ level high temperature valve is mainly used in heavy oil catalytic cracking unit of refinery, which contains three rotating nozzle used in the lining of parts such as high temperature wear gate valves.P grade Ⅱ valve body material as the CF8 ASTMA351 standard as the fundamental form of "high temperature level Ⅱ carbon chromium nickel and rare earth, titanium in tantalum type heat resistant steel".

4, High temperature Ⅲ level

Valve working temperature is 650 ~ 730 ℃, as the high temperature Ⅲ level (hereinafter referred to as the P Ⅲ level).P Ⅲ level high temperature valves are mainly used on large heavy oil catalytic cracking unit in the refinery.P Ⅲ level high temperature valve body material for the CF8M ASTMA351 standard for fundamental form of "high temperature Ⅲ carbon chromium nickel molybdenum in rare earth, titanium tantalum enhanced heat resistant steel".
 

5, High temperature Ⅳ level      

Valve working temperature is 730 ~ 816 ℃, as the high temperature Ⅳ level (hereinafter referred to as the P Ⅳ level).Will P level Ⅳ valve operating temperature limit at 816 ℃ because valve design chosen standard ASMEB16134 pressure - temperature rating provides a maximum temperature of 816 ℃ (1500 nu).In addition, after the working temperature exceeds 816℃, the steel is close to entering the forging temperature region, at this time the metal is in the plastic deformation region, the plasticity of the metal is good, it is difficult to bear the high working pressure and impact force and maintain the deformation.P grade Ⅳ valve body material as the CF8M ASTMA351 standard as the fundamental form "high temperature Ⅳ carbon chromium nickel molybdenum in rare earth, titanium tantalum enhanced heat resistant steel".CK-20 and ASTMA182 standard F310(including C content ≥01050%) and F310H and other heat-resistant stainless steel.

6, High-temperature Ⅴ level

Operating temperature of valve Ⅴ level above 816 ℃, referred to as P, P Ⅴ level high temperature valve (for cut off valve, rather than the external regulation butterfly valves) must be the use of special design method, such as lining insulation lining or water or air cooling, etc., can guarantee the normal work of the valve.So, level of P Ⅴ high temperature valve operating temperature limit does not make the rules, the working temperature of this is because the control valve is not only on the material, but with the special design method to solve, and the basic principle of design method is the same.P Ⅴ level high temperature valves according to the pressure of work and working medium and the special design methods and so on, choose reasonable, can meet the material of the valve.In P Ⅴ scale high temperature valve, normally the flue board flashboard valve or butterfly valve or butterfly plate often choose the HK - 30 ASTMA297 standard, HK - 40 high temperature alloy, they are able to under 1150 ℃ oxidation and corrosion in a reducing gas, but it can't withstand the impact and pressure load.

主站蜘蛛池模板: 粉嫩大学生无套内射无码卡视频 | 收集最新中文国产中文字幕 | 国产古装全黄A级视频 | 国产第一页浮力影院入口 | 国产初高中生真实在线视频 | 521av永久免费地址 | 四虎成人精品无码 | AV无码人妻无码男人的天堂 | 免费无码黄动漫在线观看尤物 | 无码国精品一区二区免费 | 99久久精约久久久久久清纯 | 懂色av中文在线 | 精品国产不卡在线观看免费 | 免费人成在线观看成人片 | 欧美人与动性xxxxx交性 | 无码日韩做暖暖大全免费不卡 | 日韩欧美毛片免费观看 | 色爱无码AV综合区 | 精品国产午夜福利精品推荐 | 欧美丝袜办公室系列brazzers | 含着她的花蒂啃到高潮在线观看 | 亚洲国产精品久久久久婷婷图片 | 国产日产欧洲无码视频 | 深夜A级毛片免费无码视频 亚洲精品色播一区二区 | 国产精品嫩草影院久久 | 国产成人免费97在线 | 美女被男人桶的好爽 | 怡春院性无码免费视频 | 俄罗斯兽交黑人又大又粗水汪汪 | 国产精品国产三级国快看 | 免费精品无码AV片在线观看 | 青草国产超碰人人添人人碱 | 国产一卡二卡3卡四卡免费 国产精华液一线二线三线 77777亚洲午夜久久多人 | 亚洲狼人伊人中文字幕 | 亚洲精品无码久久久久SM | 国产特黄级AAAAA片免 | 日本特黄a级高清免费大片 人妻慢慢放弃抵抗开始迎合 | 久久精品中文字幕女同 | 国产东北肥熟老胖女 | 中文字幕日韩精品一区二区三区 | 久久精品人人做人人爽97 |