(Super) Duplex Stainless Steel Tube

(Super) Duplex Stainless Steel Tube
Duplex stainless steel has a α+γ dual-phase structure, so its performance characteristics are characterized by austenitic stainless steel and ferritic stainless steel, and it is a kind of stainless steel with the best strength and corrosion resistance. Generally, in the case where C is low, the Cr content is 18% to 28%, and the Ni content is 3% to 10%. Some steels also contain alloying elements such as Mo, Cu, Nb, Ti, and N.
Compared with ferrite, it has higher plasticity, toughness, no room temperature brittleness, resistance to intergranular corrosion and weldability, and also maintains 475°C brittleness and high thermal conductivity of ferritic stainless steel, with superplasticity, etc. Features. Compared with austenitic stainless steel, the yield strength is significantly improved, and the resistance to intergranular corrosion, stress corrosion, corrosion fatigue and abrasion is significantly improved.
(Super) duplex stainless steel pipe main grades: S31803/S32250, S32750, S32760, S31500, S31500, 32001, S32003, S32304
(Super) duplex stainless steel pipe main components:
Common standards for (super) duplex stainless steel pipes:
ASTM A789 (ASME SA789)
General purpose seamless and welded ferritic/austenitic stainless steel pipe
ASTM A790 (ASME SA790)
Seamless and welded ferritic/austenitic stainless steel pipe
ASTM A928 (ASME SA928)
Standard Specification for Filled Metal Electrofusion Welded Ferritic/Austenitic (Duplex) Stainless Steel Tubing
GB/T 21832-2008
Austenitic-ferritic duplex stainless steel welded steel pipe
GB/T 21833-2008
Austenitic-ferritic duplex stainless steel seamless steel pipe
(Super) Duplex Stainless Steel Tube Performance Features:
1. Excellent resistance to general corrosion and local corrosion resistance, especially stress corrosion resistance, pitting corrosion resistance, crevice corrosion resistance, corrosion resistance, abrasion resistance, etc.
2. Good weldability
3. Good comprehensive mechanical properties
4. Good resistance to intergranular corrosion
5. High cost performance and long service life

Super austenitic stainless steel

Super austenitic stainless steel

When the pitting resistance equivalent value of chromium-nickel austenitic stainless steel (PREN=[Cr]+3.3[Mo]+16[N]) ≥40%, it can be called super austenitic stainless steel. Super austenitic stainless steel is mainly used to solve the problems of pitting corrosion and crevice corrosion resistance of the original high molybdenum (>4%) chromium-nickel austenitic stainless steel under the severe corrosion conditions containing Cl- and poor thermal stability of the structure. And developed.

Super austenitic stainless steel Main grades: N08904 (904L), N08367 (6Mo), S31254 (6Mo), S30432, S31042

 

Super austenitic stainless steel Main criteria (partial):

ASTM A312 Seamless and Welded Austenitic Stainless Steel Tube

ASTM A269 Seamless and welded austenitic stainless steel tubes for general equipment

ASTM B673, ASTM B674, ASTM B677, ASTM B675, ASTM B676, ASTM B690

 

Super austenitic stainless steel Performance characteristics:

1. Excellent resistance to pitting and crevice corrosion in harsh corrosive environments

2. Excellent mechanical properties and high yield strength

3. Good processability

Is the stainless steel bowl harmful to people?

Rational use of stainless steel tableware
The results showed that the contents of trace elements such as iron, chromium and manganese were higher than those of other pots. The usual food in these trace elements content is minimal, if the body lacks one or several, will cause harm to health. Therefore, the rational use of stainless steel tableware beneficial to human health. However, many metal elements such as chromium, molybdenum, manganese and other compounds and their excessive intake will cause different degrees of damage to human health. Users lack the knowledge of stainless steel tableware, will make stainless steel trace elements in the human body slowly accumulated, when accumulated to a certain extent will have adverse effects on health.
The use of stainless steel tableware should pay attention to the following points:
Not long time for salt, soy sauce, vinegar, soup, etc.. Because these foods contain a lot of electrolytes, if the long bloom, stainless steel will also be like other metals, such as the electrochemical reaction of the electrolyte, so that toxic metal elements are dissolved.
Avoid using stainless steel pot boil Chinese medicine. Due to the traditional Chinese medicine contains a variety of alkaloids, organic acids and other ingredients, especially in the heating conditions, it is difficult to avoid the occurrence of chemical reactions without the use of drugs and even the formation of certain toxic compounds.
Do not use strong alkaline or strong oxidizing chemicals such as soda, bleaching powder, sodium hypochlorite, etc.. Because these substances are strong electrolytes, also with stainless steel electrochemical reaction.

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Shell and tube heat exchanger

Shell and tube heat exchanger

What’s a Shell and Tube Heat Exchang

Consist of two main things as it’s name implies Shell & Tubes 

The shell is a large vassel with a number of tubes inside it .

The principle of operation is simple enough: Two fluids of different temperatures are brought into close contact but they are not mixing with each other.

One fluid runs through the tubes, and another fluid flows over the tubes (through the shell) to transfer heat between the two fluids. 

How dose it work ??!!


The temperature of the two fluids will tend to equalize . 
The heat are simply exchanged from one fluid to the other and vice versa. No energy is added or removed. 

Common types of shell and heat exchanger 

There are many types of shell-tube heat exchanger but the most common types in use are: 

U-Tube Heat Exchanger
Straight-Tube ( 1-Pass )
Straight-Tube ( 2-Pass )

Shell-Tube Heat Exchanger come with a different shapes and sizes 

We know the shell and tube heat exchanger consist of Shell side and the tubes inside it 

Two fluids of different temperatures are brought into close contact but they are not mixing with each other , one fluid flows through the shell and the other fluid flows through the tubes.

The temperature of the two fluids will tend to equalize . The heat are simply exchanged from one fluid to the other and vice versa.

There are three common types of the shell and tubes heat exchanger 

1- U-Tube
2- Straight-Tube ( 1-Pass )
3 - Straight-Tube ( 2-Pass )

Shell and Tube Heat Exchanger comes with a lot of different shapes and sizes , It could be large or small 

Finned Tube----Main fin type and supply range

Finned Tube----Main fin type and supply range

PRODUCT	DESCRIPTION	TUBE MATERIAL	FIN  MATERIAL	TUBE SIZE	FIN SIZE
High Fin Tube	Extruded Fin Tube	All Kind of Material can be applied	Aluminum A1050, A6061	15.88~50.8	7~11.5Fins/Inch Fin Height Max 16mmH
	L-Fin Tube (Wrap On Type)	All Kind of Material can be applied	Copper C1100, C1220	12.70~50.8	7~11.5Fins/Inch Fin Height Max 16mmH
	G-Fin Tube(Imbedded Type)		Aluminum A1100, A1050, A1060
	High Frequency Welded Fin Tube	Carbon Steel Tube	Carbon Steel Tube	12.70~160	1.5~7Fins/Inch 0.8~3.2mm. Thickness
		Stainless Steel Tube	Stainless Steel Tube
		Alloy Steel Material	Alloy Steel Material
	Integral Copper & Copper Alloy High Fin Tube	C12200, C11000, C70600	C12200, C11000, C70600	15.88~22.23	5~9Fins/Inch Max 12mm.H
	Oval Fin Tube	Carbon Steel Tube	Carbon Steel Tube	All Size Available	5~15Fins/Inch
		Stainless Steel Tube	Stainless Steel Tube
		Alloy Steel Material Copper &Copper Alloy Tube	Alloy Steel Material Copper &Copper Alloy Tube
Low Fin Tube	Low Fin Tube	All Kind of Material	--	9.52~40	19~54Fins/Inch
	Turbo-C Tube
	Turbo-E Tube
	Corrugated Tube	All Kind of Material	--	6.35~40	2~9Fins/Inch
	Inner Ridged Tube	C12200	--	7.93~15.88	60~75Fins/Inch
	Flower Tube	C12200	--	16.0~19.0	12~15Fins/Inch

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