
ASTM Duplex Stainless Steel Pipe Tube , super duplex stainless steel pipe
Size Range | O.D.: Φ6--Φ530mm, W.T: 0.8mm--30mm |
SCH 5,SCH 10,SCH 20,SCH 40,SCH 80,SCH 120,SCH 160,SCH XXS | |
Specification | ASTM A778,ASTM A790, A790, A789 |
Grade | S31803,S32205(Duplex),S32760, S32750 |
Duplex stainless steels are called “duplex” because they have a two-phase microstructure consisting of grains of ferritic and austenitic stainless steel.
Strength: Duplex stainless steels are about twice as strong as regular austenitic or ferritic stainless steels.
Toughness and ductility: Duplex stainless steels have significantly better toughness and ductility than ferritic grades; however, they do not reach the excellent values of austenitic grades.
Corrosion resistance: As with all stainless steels, corrosion resistance depends mostly on the composition of the stainless steel. For chloride pitting and crevice corrosion resistance, their chromium, molybdenum and nitrogen content are most important. Duplex stainless steel grades have a range of corrosion resistance, similar to the range for austenitic stainless steels
Stress corrosion cracking resistance: Duplex stainless steels show very good stress corrosion cracking (SCC) resistance, a property they have “inherited” from the ferritic side. SCC can be a problem under certain circumstances (chlorides, humidity, elevated temperature) for standard austenitics such as Types 304 and 316.
Cost: Duplex stainless steels have lower nickel and molybdenum contents than their austenitic counterparts of similar corrosion resistance. Due to the lower alloying content, duplex stainless steels can be lower in cost, especially in times of high alloy surcharges. Additionally, it may often be possible to reduce the section thickness of duplex stainless steel, due to its increased yield strength compared to austenitic stainless steel. The combination can lead to significant cost and weight savings compared to a solution in austenitic stainless steels.
Material Grade:
American Standard | Austenitic Steel: TP304,TP304L,TP304H, TP304N, TP310S,TP316,TP316L,TP316Ti,TP316H, TP317,TP317L, TP321, TP321H,TP347, TP347H,904L… Duplex Steel : S32101,S32205,S31803,S32304,S32750, S32760 Others:TP405,TP409, TP410, TP430, TP439,... |
Europen Standard | 1.4301,1.4307,1.4948,1.4541,1.4878,1.4550,1.4401,1.4404,1.4571,1.4438, 1.4841,1.4845,1.4539,1.4162, 1.4462, 1.4362, 1.4410, 1.4501 |
Russia Standard | 08Х17Т,08Х13,12Х13,12Х17,15Х25Т,04Х18Н10,08Х20Н14С2, 08Х18Н12Б,10Х17Н13М2Т,10Х23Н18,08Х18Н10,08Х18Н10Т, 08Х18Н12Т,08Х17Н15М3Т,12Х18Н10Т,12Х18Н12Т,12Х18Н9, 17Х18Н9, 08Х22Н6Т, 06ХН28МДТ |
TOBO GROUP:
Make development by enlarging scale brand building and
internationalization.
Keep Challenging and Innovation.
Advance manufacturing instruments.
Create perfect quality.
Take strict testing as guarantee, upgrade grade as object.
EXHIBITION AND CUSTORMER SATISFACTORY
Chemical Composition(%)
Alloy | 2304 |
UNS Designation | S32304 |
Carbon (C) max. | 0.030 |
Manganese (Mn) max. | 2.50 |
Phosphorus (P) max. | 0.040 |
Sulfur (S) max. | 0.030 |
Silicon (Si) max. | 1.00 |
Chromium (Cr) | 21.5 - 24.5 |
Nickel (Ni) | 3.0 - 5.5 |
Molybdenum (Mo) | 0.05 - 0.60 |
Nitrogen (N) | 0.05 - 0.20 |
Copper (Cu) | 0.05 - 0.60 |
Iron (Fe) | Balance |
Inspection & Test |
1.100% PMI, Spectro Chemical Analysis Test for Raw Material |
2.100% Dimension & Visual Examination |
3. Mechanical Properties Test Include Tension Test Flattening Test (For Seamless tube/pipe)/ Flange Test (For Welded Pipe & Tube), Hardness Test ,Reversed Flattening Test |
4.100% Hydrostatic Test or 100% NON-DESTRUCTIVE Test (ET or UT) |
5.Radiographic Test for Welded Pipe (shall be accordance with specification,or shall be as agreed upon between the purchaser and vendor) |
6.Straightness Test (optional) |
7.Roughness Test (optional) |
8.Intergranular Corrosion Test(optional) |
9.Impact Test (optional) |
10.Grain Size Determinations (optional) |
NOTES : ALL THE TESTS AND INSPECTION RESULT NEED TO BE SHOWED IN REPORTS ACCORDING TO STANDARD AND SPECIFICATION. |
TOBO STEEL GROUP CHINA
TOBO GROUP sales head offce in Shanghai.
We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area of 6,8,000square meters, existing 260 workers and 45 technicians.
We have five branch factories which can supply the best quality pipes, tubes, fittings flanges and related accessories. Now, it owns a number of advanced pipe production equipments, metal, forging, machining, cold forming, hot extrusion, such as heat treatment process, producing 60, 000 tons of pipe fittings. Company with a variety of detection devices, such as nondestructive testing, chemical analysis, metallographic examination, physical experiments. The technical is very strength, our main products contain fittingsforged socket welding fittings and threaded fittings, pipe weld and the materials of the products contain stainless steel ,duplex-stainless steel alloy steel.
In addition, we are authorized by more than 120 top-class mills from South Korea,Japan and China like JFE,SUMITOMO,POSCO,BAOSTEEL, TISCO,LISCO,.TPCO,HENGYANG VALIN and so on .
Our main products as follows:
(seamless pipe / welded pipe / square pipe / rectangular tube,duplex stainless / inconel tube)
(seamless pipe / ERW / SSAW / LSAW / UOE / hollow section pipe / Galvanized Pipe)
(line pipe,water pipeline,gas pipeline,oil pipeline)
(copper tube/titanium tube/aluminium tube/nickel alloy )
(round bar/angle steel /flat steel/channel steel/steel wire)
(eblows, equal / reducing tees, concentric/eccentric reducers, caps, crosses, bends, dish end/end cup, stub ends, unions, couplings / hex couplings, swage nipples , nipples, hex. plug, sockolet, weldolet, thredolet, etc)
(DIN flange/ AISI flange/blind flange/welding flange/stainless flange/slip on flange)
(stainless steel/carbon steel/alloy steel/galvanized steel/aluminium )
(ball valve/gate valve/butterfly valve/globe valve/swing check valve/ check valve)
In order to comply with the global modernization services development trends and eliminating the varieties distress of the global enterprise‘s purchase in the consumables.. We coordinate the pressure pipe manufacturer which with the scale of production,quality control and high cost performance (has passed ISO 9001 quality series attestation, ccs, DNV,PED/97/23/EC,AD2000-WO,special equipment manufacturing license,ASME-SA182.through a variety of effective assort mechanism to make up the shortage of supply and Post-processing of VAT enterprise, and to supply high quality pipe fittings, because of the superior quality and good service, we have established long term business cooperation with more than 60 countries and areas,which covers Europe, Africa, South America, North America, Middle East, Taiwan and South East Asia and so on.
With many years effort and support from our valuable customers, these products have obtained a big market share in the world.
Our business principle is "Superior quality,
Competitive price, Timely delivery and Considerate service "
Standing to the principle of “Enterprises focus on the core
business”, TOBO will actively promotes the globalization of
business strategy approach, using advanced supply chain
management technology to service for clients with higher quality
and more competitiveness ‘ s products. At the same time, we
sincerely reply your inquiry, honesty waiting for your visiting and
wish to have cooperation with you at the any time. We welcome
all the customers to contact us for more information. We assure
you, with our technical knowledge and experience, our
company will be one of your Stable, Continuate business parters in
China.
info@tobo-group.com