34 visiting now: 12 France France flag 12 USA USA flag 6 China China flag 4 Sweden Sweden flag

Astma789 790 Duplex Steel Seamless And Welded Tube - China

price: contact company for price

ASTMA789 790 Duplex steel seamless and welded tube

Introduction:

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

stainless steels.

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.

Benefits:

Stronger than 300 series stainless steel which also brings

weight advantages.

Cheaper than some stainless steels.

High resistance to pitting, crevice corrosion and stress

corrosion cracking.

Higher heat conductivity and lower thermal expansion than

austenitic steels.

Uses:

Pipes for production and transportation of oil and gas

Structural and mechanical components

Heat exchangers

Cooling pipes

Cargo vessels and containers

High strength wiring

Standard of ASTMA789

1. Scope*

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,

and Strip

A 1016/ A 1016M Specification for General Requirements for

Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless

Steel Tubes

E 527 Practice for Numbering Metals and Alloys ( UNS)

2.2 SAE Standard: 4

SAE J 1086 Practice for Numbering Metals and Alloys( UNS)


Company Contact:


  • Phone: 8605748200788

  • Address: B-2320, ShiJi Plaza,Daliang Street No.118,Haishu D, Ningbo, China

  • Email: Email


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'

    requirements.

    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.

Related listings



  • Forged Grinding Balls
    Forged Grinding Balls
    Metals - Alloy Steel - Shandong Huamin Steel Ball Joint-stock Co., Ltd. - China - May 17, 2016 - contact company for price

    Forged Grinding Ball Features and Advantages: 1. Surface hardness of up to 60HRC 2. High volume hardness as large as 55HRC to 60HRC, uniform hardness distribution 3. High impact toughness of greater than 12J/ cm² 4. Low breakage rate, peel fragmenta...

  • Cast Iron Grinding Balls
    Cast Iron Grinding Balls
    Metals - Alloy Steel - Shandong Huamin Steel Ball Joint-stock Co., Ltd. - China - May 17, 2016 - contact company for price

    Our cast iron grinding balls can be divided into three categories including the high chromium type, medium chromium type and the low chromium type. 1. The Quality Index of the High Chromium Type The chromium content of the high chromium type product ...

  • Forged Steel Grinding Balls
    Forged Steel Grinding Balls
    Metals - Alloy Steel - Shandong Huamin Steel Ball Joint-stock Co., Ltd. - China - May 17, 2016 - contact company for price

    The forged steel grinding ball is excellent in surface quality, toughness, and resistance to impact and abrasion. It won' t crack and lose circularity easily. The forging and stamping method that we use is that heating the metal until the temperature...



Safe Trade Tips

  • Ask for business references and check them
  • Use a payment method that offers better protection for all such as Letters of credit and verified professional escrow services. Avoid payments in advance such as money transfers
  • Verify their business via their local Chamber of Commerce
  • Search the internet using their website address, their business name, their phone and fax numbers, and their email addresses to see if you can find any feedback about them.
  • Get to know more about scams to avoid: Internet Crime Complaint Center - International Financial Scams
  • This site is never involved in any transaction, and does not handle payments, shipping, guarantee transactions, provide escrow services, or offer "buyer protection" or "seller certification"