According to relevant statistics, about 60% of chemical process pump damage is caused by corrosion, so in chemical process pump selection, we must first pay attention to the scientific material selection. There is often a misunderstanding that stainless steel is a "universal material," no matter what the media and environmental conditions are held stainless steel pump, which is very dangerous.
1) Sulfuric acid, one of the most corrosive media, is a very important industrial raw material for a wide range of uses. Different concentrations and temperatures of sulfuric acid on the corrosion of materials vary greatly, for the concentration of more than 80%, the temperature is less than 80 ℃ of concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid Process pump, not suitable for chemical process pump material; ordinary stainless steel, such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) sulfuric acid medium is also limited use.
Therefore, the delivery of sulfuric acid chemical process pump usually uses high silicon cast iron (casting and processing difficult), high alloy stainless steel (20 alloy) manufacturing. Fluorine plastic has better resistance to sulfuric acid, the fluorine-fluorine chemical process pump (F46) is a more economical choice.
2) Hydrochloric acid Most metal materials are not resistant to hydrochloric acid corrosion (including a variety of stainless steel materials), molybdenum high ferrosilicon can only be used for 50 ℃, 30% hydrochloric acid. In contrast to metallic materials, the vast majority of non-metallic materials have good corrosion resistance to hydrochloric acid, so lined rubber pumps and plastic chemical process pumps (such as polypropylene, fluoroplastic, etc.) are the best choice for the delivery of hydrochloric acid.
3) Nitric acid Most metals are mostly corroded in nitric acid, stainless steel is the most widely used nitric acid-resistant chemical process pump material, all concentrations of nitric acid at room temperature have good corrosion resistance, it is worth mentioning that the molybdenum Stainless steel (such as 316,316 L) nitric acid corrosion resistance is not only not superior to ordinary stainless steel (such as 304,321), sometimes even worse. For high-temperature nitric acid chemical process pump, usually titanium and titanium alloy materials.
4) Acetic acid It is one of the most corrosive substances in organic acids. Ordinary steel will be seriously corroded in all concentrations and temperatures of acetic acid. Stainless steel is an excellent acetic acid-resistant chemical process pump material. Molybdenum 316 stainless steel is also suitable At high temperature and dilute acetic acid steam. For high temperature and high concentration of acetic acid or other corrosive media and other harsh requirements, the choice of high-alloy stainless steel chemical process pump or fluorine plastic chemical process pump.
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our dished heads are used in a variety of applications and industries such as storage tanks, pressure vessels, road tank, food processing operations, chemical plants ,Nuclear operation, Oil Refining, Architectural feature, power generation.
Due to our forming experience and equipment, we can spin or press the first part of the process of forming your products, It depend on the thickness and material performance,
Our main products are 2:1 SE dished heads, Torispherical heads, Cones,Hemispherical Heads etc
Choosing the right type is the key decision for each customer and one for which our experience team to happy to give advice, simple speaking, the torispherical heads, the less ressure it can withstand, Conversely, the deeper dished heads, for example Elliptical heads, hemispherical, the greater pressure it can take.
Our in house-capability to form dished heads by cold press brings major benefits to our customers and sets us apart from others dished heads manufactures
For carbon steel dished heads, we can forming this dished heads from 76-9000mm in diameter and below 250mm in thickness
The general forming process as the below sketches 
Technical Delivery Condition
1,Our material (hot Rolled Unalloyed structural steel, high and low temperature steel, High Alloy steel)
We have no carbon steel plates in our stock and most of plates are from Chinese steel market or mill. Meanwhile As Japanese owed company, We can also source the plates from Japanese ex-mill if end user can`t accept ex-chinese mill.
Basically the delivery time shall be below 20days for dished heads if plates are from steel market. and Max plates width from them is below 2200mm. it means that the seamless dished heads diameter shall be below about 1800mm.
The max width CS plates that Chinese mill can do is below 4700mm,and dished heads can be seamless below 3800mm in diameter.
2,Enquiry/order required information
We can give our clients once they gave us the below information
But if clients tolerance is higher than below Hokkai standards, it shall be provided to Hokkai prior to offer or ordering.
Stainless Steel Torispherical Head
Stainless Steel Torispherical Head,Stainless Steel Torispherical Dish Head,Cold Forming Torispherical Head,Stainless Steel Polishing Torispherical Head
YIXING HOKKAI HEAD PLATE CO.,LTD , http://www.hokkaidishedend.com
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