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Petrochemical Gas Pipeline UNS s32550 super duplex corrosion resistance

HuaXia Steel Corporation Limited

Petrochemical Gas Pipeline UNS s32550 super duplex corrosion resistance

Brand Name : Hua xiao

Model Number : S32550

Certification : ISO,SGS,BV

Place of Origin : China

MOQ : 5 MT

Price : US 1000-3000 MT

Payment Terms : L/C, D/P, T/T

Supply Ability : 5000MT/Month

Delivery Time : 15 Work Days

Packaging Details : Wooden pallete, Steel pallete, Water proof woven

Color : Natural Silver

Delivery time : 15-30 Days

Thickness : 0.3mm - 50mm

Standard : ASTM,AISI,JIS,GB,DIN

Technique : Cold Rolled/Hot Rolled

Packing : Standard Sea-worthy Packing,standard exporting packing

Price term : CIF CFR FOB EX-WORK

Application : Petrochemical Equipment

Material : duplex stainless steel

Type : tube, pipe

Product name : UNS S32550 Duplex Stainless Steel High alloy type For Oil and gas pipeline

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UNS S32550 Duplex Stainless Steel High alloy type For Oil and gas pipeline

Product decribe:

S32550 duplex stainless steel

Chemical composition (mass fraction, %) Standard steel No.

C≤ Cr Ni Mo Cu N Si≤ Mn≤ P≤ S≤ American ASTM 255/S32550 0.040 24.0~27.0 4.5~6.5 2.9~3.9 1.50~2.50 0.10~0.25 1.00 1.50 0.040 0.030

Grade comparison of duplex stainless steel:

ISO X2CRNIMOCUN25-6-3;EN X2CrnimocUN25-6-3/1.4507;UK UNS S32550;Japan JIS SUS329J2L.

255/S32550 Duplex stainless steel features

255/S32550 steel is austenitic ferrite (duplex) stainless steel, based on Ferralium AlLOY255 in the UK.Developed in the

1970s, this type of steel is one of the representatives of the second generation of duplex stainless steel.255/S32550 steel

has good mechanical properties and local corrosion resistance, especially better wear resistance than ordinary austenitic

stainless steel, which is an ideal material in seawater.

Duplex stainless steel refers to ferrite and austenite about 50% each, generally less phase content at least also need

to reach 30% of stainless steel.When the content of C is low, the content of Cr and Ni ranges from 18% to 28% and 3%

to 10% respectively.Some steels also contain alloying elements such as Mo, Cu, Nb, Ti and N.Duplex stainless steel has

developed into the third generation since its birth in the United States in the 1940s.Its main characteristic is the yield

strength can reach 400-550mpa, is the ordinary stainless steel 2 times, therefore can save material, reduce the equipment

manufacturing cost.In the aspect of corrosion resistance, especially under the condition of harsh medium environment

(such as seawater, high chloride ion content), the anti-pitting corrosion, crevice corrosion, stress corrosion and corrosion

fatigue performance of duplex stainless steel is obviously better than ordinary austenitic stainless steel, which can be

comparable with high-alloy austenitic stainless steel.

Duplex stainless steel characteristics:

(1) Molybdenum - containing duplex stainless steel has good chloride stress corrosion resistance under low stress.

Generally, 18-8 type austenitic stainless steel is prone to stress corrosion fracture in neutral chloride solution above

60° C. Heat exchangers, evaporators and other equipment manufactured with such stainless steel in trace chloride

and hydrogen sulfide industrial medium have the tendency to produce stress corrosion fracture, while duplex stainless

steel has good resistance.

(2) Molybdenum - containing duplex stainless steel has good corrosion resistance.The critical pore corrosion potential

of duplex stainless steel and austenitic stainless steel is similar when the quantity value (PRE=Cr%+3.3Mo%+16N%)

has the same pore corrosion resistance.The corrosion resistance of duplex stainless steel and austenitic stainless steel

is comparable to AISI 316L.The resistance to pore corrosion and crevices of high chromium duplex stainless steel

containing 25%Cr, especially nitrogen, exceeds AISI 316L.

(3) Have good corrosion resistance fatigue and wear corrosion performance.In some corrosive medium conditions,

suitable for the manufacture of pumps, valves and other power equipment.

(4) Good comprehensive mechanical properties.It has high strength and fatigue strength. The yield strength is twice that

of type 18-8 austenitic stainless steel.The elongation of solid solution state reaches 25%, and the toughness value AK

(V-notch) is above 100J.

(5) Good weldability, small hot crack tendency, generally do not need preheating before welding, after welding does not

need heat treatment, can with 18-8 type austenitic stainless steel or carbon steel and other different welding.

(6) Dual-phase stainless steel with low chromium (18%Cr) has a wider thermal processing temperature range than 18-8

type Austenitic stainless steel with less resistance. It can be rolled directly to produce steel plates without forging.Biphasic

stainless steels with high chromium content (25%Cr) are slightly more difficult to process than austenitic stainless steels

and can be used to produce products such as plates, tubes and wires.

(7) The working hardening effect of 18-8 type austenitic stainless steel during cold working is larger than that of 18-8 type

austenitic stainless steel. In the initial stage of tube and plate bearing deformation, greater stress should be applied to

deformation.

(8) Compared with austenitic stainless steel, the thermal conductivity is large, the coefficient of linear expansion is small,

suitable for the lining of equipment and production of composite board.Also suitable for the manufacture of heat exchanger

core, heat transfer efficiency is higher than austenitic stainless steel.

(9) There are still various brittleness tendencies of high chromium ferritic stainless steel and should not be used in working

conditions higher than 300°C.The lower the chromium content of a duplex stainless steel, the less harmful the brittle phase

such as is.

classification:

1 . low alloy type, representing the brand UNS S32304 (23CR-4NI-0.1n). The steel does not contain molybdenum.

The PREN value is 24-25.

2 .medium alloy type, with the representative brand UNS S31803 (22CR-5Ni-3mo-0.15n). The PREN value is 32-33,

and its corrosion resistance is between AISI 316L and 6%Mo+N Austenitic stainless steel.

3 . high alloy, usually containing 25%Cr, molybdenum and nitrogen, and some copper and tungsten, standard

UNSS32550 (25CR-6ni-3mo-2Cu-0.2n) with PREN value of 38-39. The corrosion resistance of this type of steel

is higher than that of duplex stainless steel with 22%Cr.

4 .super dual phase stainless steel type, containing high molybdenum and nitrogen, standard grade UNS S32750

(25CR-7NI-3.7 Mo-0.3n), some also contain tungsten and copper,PREN value is more than 40, can be used

in harsh medium conditions, has good corrosion resistance and mechanical comprehensive energy, can be

comparable with super austenitic stainless steel.

Stainless Steel Coil, Strip, Sheet, Plate, Tube/Pipe
Grade: 201 , 301 , 304 , 304L , 309S , 310S, 316L, 317L, 321, 409L, 410, 410S, 430, 439, 444, 904L, 2205, 2507, etc.
Finish: NO.1, 2B, 2D, BA, NO.4, NO.8, 8K, mirror, hair line, sand blast, brush, etching, checkered, embossed, etc.
Thick: 0.2 - 200 mm Width: 4 - 2000 mm Length: 500 - 12000 mm / coil
Surface Feature Summary of manufacturing method Application
NO.1 Silver white matt A rough, matte surface that is hot rolled to a specified thickness, then annealed and descaled Does not require surface gloss
NO.2D silver white Heat treatment and pickling after cold rolling 2D products are used for applications that do not require strict surface requirements, general materials, and deep drawing materials
NO.2B Gloss is stronger than NO.2D After NO.2D treatment, the final pass is lightly cold rolled by polishing rollers General materials
BA Bright as a mirror There is no standard, but it is usually bright annealed surface processing, with high surface reflectivity. Building materials, kitchen utensils
NO.3 Rough grinding Use 100~200# (unit) grinding belt for grinding Building materials, kitchen utensils
NO.4 Intermediate grinding Polished surface obtained by grinding with 150~180# abrasive belt Same as above
NO.240 Fine grinding Grinding with 240# grinding belt Kitchenware
NO.320 Very fine grinding Grinding with 320# grinding belt Same as above
NO.400 Gloss close to BA Use 400# polishing wheel for grinding General timber, construction timber, kitchen utensils
HL Hairline grinding Grinding the hairline with the appropriate particle size abrasive material (150~240#) has a lot of grains Buildings, construction materials
NO.7 Close to mirror polishing Use 600# rotary polishing wheel for grinding For art and decoration
NO.8 Mirror grinding Mirror grinding with polishing wheel Reflector, for decoration


Product & Application



Company Profile
Huaxiao Metal Corporation Limited
Huaxiao metal Corporation Limited is invested by Huaxia international Steel Corporation limted ,Huaxiao

is a professional manufacturer and exporter that is concerned with the development and production of

stainless steel,almuminum, carbon steel, GI, PPGI, and pipe, bar, fastener ,and other metal parts .
Our head office are located in Shanghai with convenient transportation access. Hebei branch office is

establishedin Tangshan city. All of our products comply with international quality standards and are

greatly appreciated in a variety of different markets throughout the world.
Covering an area of 4,000 square meters, we now have over 15 employees team specially responsible

for export business, an annual sales figure that exceeds USD 80Milllon in 2018 ,total more than 40,000

metric ton metal products be exported, and are currently exporting
100% of our production worldwide.
Our well-equipped facilities and excellent quality control throughout all stages of productionenables us to

guarantee total customer satisfaction. Besides, we and our partner factories have obtained ISO9001,

TS16949 certificate.


Shipment & Payment

Shipment/Delivery GP20', GP40', GP45', HQ40,Bulk Vessel,Flat Rack,SOC container ,RF (usually for small tube to make cost down)
Payment T/T, L/C At Sight, OA( After we konw each other more )
Product Title 304/304L stainless steel pipe for drinking water,304/304L stainless steel pipe for dinner set,304/304L stainless steel pipe for machinery


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