Duplex Stainless Steel pipe Resistant to stress corrosion cracking
1.Product Description
Name S32010 Duplex Stainless Steel pipe Resistant to stress corrosion cracking
Grand:SAF2205(S31803),SAF2507(S32507),SAF2304(S32304),S32010,S32304,S32003,S32760,S32205,1.4362,1.4462,1.4410,1.4501,2205,4501,LDX2101,LDX2304 59and so on.
Standard ASTM, GB, JIS, DIN, EN, AISI
Material Grade SUS304 304L 304LP 316 316Lmod 1.4301 1.4436 1.4411 725LN 253MA 904L N08926
S34565 1.4162 1.4529 1.4539 1.4547 1.4565 1.4652 254SMO 347and so on.
Outer Diameter Seamless Pipe: 4mm-914.4mm
Welded Pipe: single slit(Φ8mm-Φ630mm); girth(Φ630mm-Φ3000mm),
Thickness Seamless Pipe: 0.6mm - 60mm
Welded Pipe: single slit(0.5mm-25mm);girth(3mm-45mm)
Length 5.8-6.1 m or as customers' request
Tolerance Acording to the Standard.
Surface 180G, 320G, 400G Satin / Hairline
400G, 500G, 600G or 800G Mirror finish
Application Petrochemical industry, chemical fertilizer industry, oil refining industry, oil and gas industry, light industry and food industry, pulp and paper industry, energy and environmental industries.
Test UT, ET, HT, RT,ect, and others according to the standard,or as the requests of the customers
Duplex stainless steel pipe has good welding performance. Compared with ferritic stainless steel and austenitic stainless steel, it is not like the heat-affected zone of welding of ferritic stainless steel. The plastic toughness is greatly reduced due to the severe coarsening of grains. It is also not as sensitive to welding hot cracks as austenitic stainless steel.
Due to its special advantages, duplex stainless steel is widely used in petrochemical equipment, seawater and wastewater treatment equipment, oil and gas pipelines, paper machinery, and other industrial fields. In recent years, it has also been studied in the field of bridge load-bearing structures. Prospects.
Duplex stainless steel is composed of ferrite phase and austenite phase in its solid quenched structure, and the content of the minimum phase may reach 30%.
Features
Due to the characteristics of the two-phase structure, through the correct control of the chemical composition and heat treatment process, DSS has the advantages of ferritic stainless steel and austenitic stainless steel.
Compared with austenitic stainless steel, the advantages of duplex stainless steel
(1) The yield strength is more than double that of ordinary austenitic stainless steel, and it has sufficient plastic toughness for forming. The wall thickness of the storage tank or pressure vessel made of duplex stainless steel is 30-50% less than that of commonly used austenite, which is beneficial to reduce costs.
(2) It has excellent resistance to stress corrosion cracking. Even the duplex stainless steel with the lowest alloy content has higher stress corrosion cracking resistance than austenitic stainless steel, especially in the environment containing chloride ions. Stress corrosion is a prominent problem that ordinary austenitic stainless steel is difficult to solve.
(3) The corrosion resistance of 2205 duplex stainless steel, which is the most common application in many media, is better than that of ordinary 316L austenitic stainless steel, while super duplex stainless steel has extremely high corrosion resistance. In some media, such as acetic acid, Formic acid can even replace high-alloy austenitic stainless steel and even corrosion-resistant alloys.
(4) It has good local corrosion resistance. Compared with austenitic stainless steel with equivalent alloy content, its wear resistance and fatigue corrosion resistance are superior to austenitic stainless steel.
(5) The coefficient of linear expansion is lower than that of austenitic stainless steel, close to carbon steel, suitable for connection with carbon steel, and has important engineering significance, such as the production of composite panels or lining.
(6) No matter under dynamic load or static load conditions, it has higher energy absorption capacity than austenitic stainless steel. This has obvious advantages for structural parts to deal with unexpected accidents such as collisions and explosions. Duplex stainless steel has practical application value. .
The weakness of duplex stainless steel compared to austenitic stainless steel
(1) The universality and versatility of the application are not as good as austenitic stainless steel, for example, its use temperature must be controlled below 250 ºC.
(2) Its plastic toughness is lower than that of austenitic stainless steel, and its cold and hot processing technology and forming performance are not as good as austenitic stainless steel.
(3) There is a middle temperature brittle zone, and the process system of heat treatment and welding needs to be strictly controlled to avoid the appearance of harmful phases and damage performance.
Compared with ferritic stainless steel, the advantages of duplex stainless steel
(1) The overall mechanical properties are better than ferritic stainless steels, especially the plastic toughness, which is not as sensitive to brittleness as ferritic stainless steels.
(2) In addition to stress corrosion resistance, other local corrosion resistance is better than ferritic stainless steel.
(3) The cold working process performance and cold forming performance are far superior to ferritic stainless steel.
(4) Welding performance is also far superior to ferritic stainless steel. Generally, preheating is not required before welding, and no heat treatment is required after welding.
(5) The application range is wider than ferritic stainless steel.
The weakness of duplex stainless steel compared to ferritic stainless steel
The alloy element content is high, the price is relatively high, the general ferrite does not contain nickel.
Duplex Stainless Steel (referred to as DSS) refers to ferrite and austenite each accounting for about 50%, generally the content of the less phase also needs to be at least 30% stainless steel. In the case of low C content, Cr content is 18% ~ 28%, Ni content is 3% ~ 10%. Some steels also contain alloying elements such as Mo, Cu, Nb, Ti, and N.
This type of steel has the characteristics of austenitic and ferritic stainless steel. Compared with ferrite, it has higher plasticity and toughness, , and has significantly improved intergranular corrosion resistance and welding performance, while maintaining iron. The 475 ° C brittleness and high thermal conductivity of plain stainless steel are characterized by superplasticity. Compared with austenitic stainless steel, the strength is high and the resistance to intergranular corrosion and chloride stress corrosion is significantly improved. Duplex stainless steel has excellent pitting corrosion resistance and is also a nickel-saving stainless steel.
The welding characteristics of duplex stainless steel are as follows:
After normal solution treatment (heating and water cooling at 1020 ºC ~ 1100 ºC), the duplex stainless steel contains about 50% ~ 60% austenite and 50% ~ 40% ferrite structure. With the increase of heating temperature, the change of the two phases is not obvious.
Duplex stainless steel has good low-temperature impact toughness. For example, the transverse absorption of a 20 mm thick plate can reach more than 100J at -80 ºC. In most media, its uniform corrosion resistance and pitting corrosion resistance are good, but it should be noted that when this type of steel is heat treated below 950 ° C, its stress corrosion resistance will be significantly deteriorated due to the precipitation of σ phase. Since the ratio of Cr equivalent to Ni equivalent of the steel is appropriate, a large amount of primary austenite structure remains after heating at high temperature, and secondary austenite can be generated during the cooling process, resulting in the total amount of austenite phase in the steel Not less than 30% ~ 40%, so that the steel has good resistance to intergranular corrosion.
In addition, as mentioned earlier, the tendency to crack when welding this steel is very low, and preheating and post-weld heat treatment are not necessary. Due to the high N content in the base metal, the single-phase ferrite area will not be formed in the welding near-seam area, and the austenite content is generally not less than 30%. Applicable welding methods include tungsten electrode argon arc welding and electrode arc welding. Generally, in order to prevent coarsening of the grains near the seam area, low linear energy welding should be used when welding.
2. Our Service For You
Pre-sale Service
1. Sample can be offered with sample charge and courier fee by buyer's side.
2. We have full stock,and can deliver within short time.Many styles for your choices.
3. OEM and ODM order are accepted, Any kind of logo printing or design are available.
4. Good Quality + Factory Price + Quick Response + Reliable Service, is what we are trying best to offer you
5. All of our products are produce by our professional workman and we have our high-work-effect foreign trade team, you can totally
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6. We have 8 year experience of design, manufacture and sell lingerie, we cherish every order from our honor.
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3.FAQ
Q: What's your minimum order quantity?
A: Our minimun quantity is 500 Kg. We also can offer you samples.
Q: What's your delivery time?
A: Our normal delivery time is 7-20 days, and it depends on your quantity and items. Of course, if you need products urgently, we
also will consider arranging it firstly.
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A: Our prices are based on the material grade, size, quantity and physical performance etc. So if you can offer us the detailed
information, then we can give you the best reasonable price. Also, we can do special size and color for customers.
Q: What's your after-sales service?
A: We have two ways to handle claims by replacement and deduction. Of course, if the materialis not good used by wrong parameter
from customer, we won't be responsible.
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A: We have advantages with 22 years of professional experiences in manufacturing & designing, advanced technology & the first-class
equipment, perfect logistics management, high-quality after-sales service and competitive price.
4. Contact us
Name: Alicia Liu
Address: 518,XINZHUAN ROAD, SONGJIANG DISTRICT, SHANGHAI, CHINA 201612
Web: shanghaibozhong.en.made-in-china.com
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