Common valve materials and numbering professional knowledge Valve materials standards

Common valve materials and numbering professional knowledge Valve materials standards

Common valve materials and numbers of professional knowledge, including WCB, LC3, WC6, WC9, etc., WCB: Carbon steel ASTM A216 non-corrosive use, including water, oil easygoing, WC61.25% chromium 0.5% molybdenum steel ASTM A217 non-corrosive use, including water, oil easygoing, temperature range: -30 to 593 Temperature range: -30℃ to 425℃ WC9 2.25 Chromium ASTM A217 Non-corrosive application containing water, oil,..
Common valve materials and numbering expertise
WCB
Carbon steel
ASTM A216
Non-corrosive application, contains water, oil easygoing,
Temperature range: -30℃ to 425℃
LCB
Ultra-low temperature carbon steel
ASTM A352
Ultra-low temperature operation, the temperature is as low as -46℃
Cannot be used in places where the temperature is higher than 340 ° C
LC3
3.5% nickel steel
ASTM A352
Ultra-low temperature operation, the temperature is as low as -101℃
Cannot be used in places where the temperature is higher than 340 ° C
WC6
1.25% chrome 0.5% molybdenum steel
ASTM A217
Non-corrosive application, contains water, oil easygoing,
Temperature range: -30℃ to 593℃
WC9
2.25 Chromium
ASTM A217
Non-corrosive application, contains water, oil grade WC9 easygoing,
Temperature range: -30℃ to 593℃
C5
5% chromium 0.5% molybdenum
ASTM A217
Slightly corrosive or erosive applications and non-corrosive applications,
Temperature range: -30℃ to 649℃
C12
9% chromium and 1% molybdenum
ASTM A217
Slightly corrosive or erosive applications and non-corrosive applications,
Temperature range: -30℃ to 649℃
CA6NM(4)
12% manganese steel
ASTM A487
Corrosive application,
Temperature range: -30℃ to 482℃
CA15(4)
12pc chromium
ASTM A217
Corrosive application,
The temperature range reaches 704℃
CF8M 3
16 stainless steel plate
ASTM A351
Corrosive or warm or continuous high temperature non-corrosive use,
Temperature range: -268℃ to 649℃,
The temperature of 425℃ is about specific carbon content 0.04% or above
CF8C
347 stainless steel plate
ASTM A351
Mainly used in continuous high temperature, corrosive application,
Temperature range: -268℃ to 649℃,
Temperature 540℃ to specific carbon content 0.04% or above
CF8
304 stainless steel plate
ASTM A351
Corrosive or temperature or continuous high temperature non-corrosive use,
Temperature range: -268℃ to 649℃,
The temperature of 425℃ is about specific carbon content 0.04% or above
CF3
304L stainless steel plate
ASTM A351
Corrosive or non-corrosive use,
The temperature range reaches 425℃
CF3M
316L stainless steel plate
ASTM A351
Corrosive or non-corrosive use,
The temperature range reaches 454℃
CN7M
Carbon steel
ASTM A351
With very good heat-resistant hydrochloric acid corrosion performance,
The temperature reached 425℃
M35-1
Monel
ASTM A494
Weldable welding grade. Has very good resistance to all general organic matter and salt water
Corrosion properties. It also has high resistance to most alkaline substances
The performance of the temperature up to 400℃
N7M
Haast nickel base alloy B
ASTM A494
Especially suitable for Cpu hydrochloric acid at a wide variety of concentrations and temperatures.
Excellent resistance to hydrochloric acid and ammonium sulfate corrosion, temperature
It reaches 649℃
CW6M
Haast nickel base alloy C
ASTM A494
It has very good corrosion resistance to strong oxidation environment. Under high temperature
Has very good characteristics, p-benzoic acid (formic acid), ammonium sulfate, sulfite
And hydrochloric acid have high corrosion resistance, the temperature reaches 649℃
CY40
Inke nickel base alloy
ASTM A494
In high temperature application of the main performance is very good. Against strongly etched fluid media
The standard valve material is one of the indispensable accessories in the pipeline, because of its uniqueness, it not only to ensure that in different temperature, not the same working pressure, not the same medium chemical and physical properties of the main parameters of the reliable role, and also for the use of many roles in the valve. Therefore, this determines the diversity of the valve in the material selection. It can be said that the vast majority of materials on the market at present, including light metals, rare metals, rubber products, plastics and porcelain can be used in the valve.
Valve is one of the indispensable accessories in the pipeline, because of its uniqueness, it not only to ensure that in different temperature, not the same working pressure, not the same medium chemical and physical properties of the main parameters of the reliable role, and also to carry out many roles in the use of the valve. Therefore, this determines the diversity of the valve in the material selection. It can be said that the vast majority of materials on the market at present, including light metals, rare metals, rubber products, plastics and porcelain can be used in the valve.
Although on the surface, a valve is very simple, but in fact the various parts of the valve materials involved in the course is not available to other mechanical equipment. It not only involves material, fluid dynamics, heat, organic chemistry, etching, metallographic analysis, but also involves the basic knowledge of mechanical structure design, automatic control system, mechanical manufacturing process and its flaw detection, electric welding. Therefore, for every valve engineering technician who meets the requirements, it is necessary to have a familiar knowledge of valve product structure and independent innovation, a solid foundation in basic theoretical academic research, and should have a high quality in how to select materials. In order to achieve this overall goal, we must do the following aspects:
1, to ** understand and collect the world’s existing a variety of material information and the corresponding material specifications.
2. Continue to learn from experience in daily work.
3, close cooperation with scientific research institutions, targeted research and development of valves needed new materials, easy to expand the scope of material selection.
Since the reform and opening up, China has made numerous research and development of new valve materials, such as: For Sichuan natural gas engineering project developed H2S resistant medium valve seat material 318 steel, bite resistant 303Se, 410Se and other easy cutting stainless steel, low temperature resistance -101℃ 3.5Ni (LC3) low temperature steel, heat resistant ZG1Cr5Mo continuous high temperature steel, salt water corrosion resistant dual-phase steel, nickel base superalloy pig iron, Abrasion resistant and wear resistant cast iron, and improve the service life of the valve surface SF-3T, SF-4T, SF-5T and other surfacing electrode. This effect is the first clear project research or regional issued scientific research plan, through the relevant departments to cooperate with science and technology.
General criteria for material selection
Because the valve belongs to the pressure vessel range, and the valve parts in the valve to play a different role. Therefore, in order to ensure that the valve can be trusted, in the actual use of valve parts, material selection is particularly important.
When using valve parts materials, the following standards can be followed:
1. Scope of application: that is, material selection should be in accordance with the use of the corresponding valve parts. (Organic chemical properties, corrosion resistance, heat resistance, structural mechanical properties, etc.)
2 feasibility analysis and rationality: that is, the selection of materials, to focus on the market is conducive to purchase, the price is suitable, it is best not to use high materials low.
3. Stability: After determining a kind of valve parts material, it is also necessary to carry out corresponding calculation, taking into account the possible problems and the corresponding countermeasures taken to ensure that the selected materials reach the use mode.
4. Process performance: when selecting materials, it is necessary to understand the process performance of material processing to obtain better economic benefits.