Astma789 790 Duplex Steel Seamless And Welded Tube - Chinaprice: contact company for price
Called Duplex Pipe because of its mixed microstructure with
about equal proportions of ferrite and austenite, duplex
stainless steels are a family of grades, which range in
corrosion performance depending on their alloy content. The
chemical composition based on high contents of Cr and Mo,
improves intergranular and pitting corrosion resistance,
respectively. Additions of nitrogen can promote structural
hardening by interstitial solid solution mechanism, which
raises the yield strength and ultimate strength values
without impairing toughness. Moreover, the two- phase
microstructure guarantees higher resistance to pitting and
stress corrosion cracking in comparison with conventional
Duplex is a stainless steel made from a mixture of austenite
and ferrite phases. Like most austenitic stainless steels,
duplex has a strong resistance to corrosion, similar to
those of a Type 304 and 316.
Unlike similar steels, duplex also displays an improved
resistance to localized corrosion, particularly pitting,
crevice corrosion and stress corrosion cracking. And because
duplex has a lower nickel and molybdenum content than other
austenitic stainless steels, it can prove a more cost
effective option due to a lower alloying content.
Due to its Ferritic qualities, duplex steel also shows very
good resistance to stress corrosion cracking when compared
to standard austenitic. In some cases, the strength of
duplex steel can be up to double that of the most commonly
used grades of stainless steel.
Duplex becomes brittle at extreme temperatures so its use is
normally restricted to a maximum temperature of 300 degrees.
Duplex also shows signs of embrittlement at - 50 degrees.
Stronger than 300 series stainless steel which also brings
Cheaper than some stainless steels.
High resistance to pitting, crevice corrosion and stress
Higher heat conductivity and lower thermal expansion than
Pipes for production and transportation of oil and gas
Structural and mechanical components
Cargo vessels and containers
High strength wiring
Standard of ASTMA789
1.1 This specification2 covers grades of nominal wall
thickness, stainless steel tubing for services requiring
general corrosion resistance, with particular emphasis on
resistance to stress corrosion cracking. These steels are
susceptible to embrittlement if used for prolonged periods
at elevated temperatures.
1.2 The values stated in either inch- pound units or SI units
are to be regarded separately as standard. Within the text,
the SI units are shown in brackets. The values stated in
each system are not exact equivalents; therefore, each
system must be used independently of the other. Combining
values from the two systems may result in nonconformance
with the specification. The inch- pound units shall apply
unless the M designation of this specification is specified
in the order.
2. Referenced Documents
2.1 ASTM Standards: 3
A 480/ A 480M Specification for General Requirements for
Flat- Rolled Stainless and Heat- Resisting Steel Plate, Sheet,
A 1016/ A 1016M Specification for General Requirements for
Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless
E 527 Practice for Numbering Metals and Alloys ( UNS)
2.2 SAE Standard: 4
SAE J 1086 Practice for Numbering Metals and Alloys( UNS)
- Posted By: Ningbo Junfun International Trade Co.,Ltd
- Phone: 8605748200788
- Address: B-2320, ShiJi Plaza,Daliang Street No.118,Haishu D, Ningbo, China
- Website: http://www.junfunsteel.com
Published date: September 14, 2015 -
- Business Description: Junfun is an available Chinese supplier located in Ningbo city. We focus
on steelfiled, under the brand name of "Junfun", including seamless
steel pipe,welded steel pipe, ball valve, butterfly valve, flange,
elbow, tee,etc., which are used in industries like petrol,
chemical,pharmaceuticals, environmental protection, food&water,
conservancy,shipbuilding, automobile, aerospace, pressure vessels,
mechanical processing, etc. Professional and experienced workers, strict
supply chain management ensures the fulfillment of clients'
From the raw material to finished products, we insist on recording each
step of production situation and test, which can track the quality
problem. Welcome inquiry, welcome cooperation.
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