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UNS 32750 Dupex Stainless Steel Seamless Pipe & Tubes

 TYPES OF ALLOY STEEL PIPES

We,at Hitech Metal & Tubes having the experience of 30 years in Stainless steel Seamless pipe,Tube & tubing business. We can meet your EXACT SPECIFICATIONS in SS Seamless Pipes Tubes Stainless Steel Seamless Pipes Tubes
Stainless Steel Seamless Pipe,Tube & tubing

We sell NEW, SURPLUS & USED Stainless STEEL Seamless PIPE,Tube & TUBING.

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 » 304 Stainless Steel Seamless Pipe & Tubes
» 304L Stainless Steel Seamless Pipe & Tubes
» 304H Stainless Steel Seamless Pipe & Tubes
» 310 Stainless Steel Seamless Pipe & Tubes
» 316 Stainless Steel Seamless Pipe & Tubes
» 316H Stainless Steel Seamless Pipe & Tubes
» 316L Stainless Steel Seamless Pipe & Tubes
» 317L Stainless Steel Seamless Pipe and Tubes
» 321 Stainless Steel Seamless Pipe & Tubes
» 347 Stainless Steel Seamless Pipe & Tubes
» 904L Stainless Steel Seamless Pipe and Tubes
» UNS 32750 Dupex Stainless Steel Seamless Pipe & Tubes

UNS 32750 Super Duplex Stainless Steel Pipes and Tubes

Super Duplex Stainless Steel is a highly alloyed, good performance Duplex steel with a pitting resistance. Super Duplex offers good resistance to pitting and crevice corrosion. Super Duplex is suited for use in aggressive environments. Super Duplex Stainless has good resistance to stress corrosion cracking in chloride and sour environments. Super Duplex has good resistance to erosion corrosion and corrosion fatigue.

Super Duplex stainless like Duplex, is a mixed microstructure of austenite and ferrite (50/50) which has improved strength over ferritic and austenitic steel grades. The main difference is that Super duplex has a higher Molybdenum and Chromium content which gives the material greater corrosion resistance.

Stainless Steel Super Duplex 2507 is designed for applications which demand exceptional strength and corrosion resistance. The high molybdenum, chromium and nitrogen content in Super Duplex 2507 results in excellent resistance to chloride pitting and crevice corrosion attack and the duplex structure provides Super Duplex 2507 with exceptional resistance to chloride stress corrosion cracking. Usage of Super Duplex Steel 2507 should be limited to applications below 600° F (316° C). Extended elevated temperature exposure can reduce both the toughness and corrosion resistance of Alloy 2507.

Super Duplex has the same benefits as its counterpart - it has lower production costs when compared with similar ferritic and austenitic grades and due to the materials increased tensile and yield strength, in many cases this gives the purchaser the welcomed option of purchasing smaller thicknesses without the need to compromise on quality and performance.

Benefits of UNS32750 Super Duplex Stainless Steel

  • Improved corrosion resistance in comparison to Duplex
  • Greater tensile and yield strength
  • Good ductility and toughness
  • Good stress corrosion cracking resistance (SSC)
  • Opportunity for purchases to reduce their material costs without compromising on quality
Super Duplex 2507 Pipe & Tube
Standards Seamless Welded
ASTMA 789 / 790A 789 / 790
ASMESA 789 / 790SA 789 / 790

Applications

  • Oil and gas industry equipment.
  • Offshore platforms, heat exchangers, process and service water systems, fire-fighting systems, injection and ballast water systems.
  • Chemical process industries, heat exchangers, vessels, and piping.
  • Desalination plants, high pressure RO-plant and seawater piping.
  • Mechanical and structural components, high strength, corrosion-resistant parts.
  • Power industry FGD systems, utility and industrial scrubber systems, absorber towers, ducting, and piping.

General Properties

Alloy 2507 is a super duplex stainless steel with 25% chromium, 4% molybdenum, and 7% nickel designed for demanding applications which require exceptional strength and corrosion resistance, such as chemical process, petrochemical, and seawater equipment. The steel has excellent resistance to chloride stress corrosion cracking, high thermal conductivity and a low coefficient of thermal expansion. The high chromium, molybdenum, and nitrogen levels provide excellent resistance to pitting, crevice, and general corrosion.

The impact strength is also high. Alloy 2507 is not recommended for applications which require long exposures to temperatures above 570°F because of the risk of a reduction in toughness.

 

UNS 32750 Dupex Steel Seamless Pipes packaging & shipping policy

UNS 32750 Dupex Steel Seamless Pipes is sleeved into plastic bag individually, ten pieces wrapped with water-proof material, bundled with nylon rope. Clear labels are tagged on the outside of the package for easy identification of the quantity and product I.D. Great care is taken during operation and transportation.

Standards
ASTM/ASME .......... A240 - UNS S32750
EURONORM............ 1.4410 - X2 Cr Ni MoN 25.7.4
AFNOR.................... Z3 CN 25.06 Az

Corrosion Resistance

  • General Corrosion
    The high chromium and molybdenum content of 2507 makes it extremely resistant to uniform corrosion by organic acids like formic and acetic acid. 2507 also provides excellent resistance to inorganic acids, especially those containing chlorides.
    In dilute sulfuric acid contaminated with chloride ions, 2507 has better corrosion resistance than 904L, which is a highly alloyed austenitic steel grade specially designed to resist pure sulfuric acid.
  • Stainless steel of type 316L (2.5%Mo) cannot be used in hydrochloric acid due to the risk of localized and uniform corrosion. However, 2507 can be used in dilute hydrochloric acid. Pitting need not be a risk in the zone below the borderline in this figure, but crevices must be avoided.
  • Isocorrosion curves, 0.1 mm/year, in sulfuric acid 
    with an addition of 2000 ppm chloride ions
  • Isocorrosion curves, 0.1 mm/year, in hydrochloric acid. 
    Broken line curve represents the boiling point
  • Critical Pitting Temperature (CPT) range for 
    various alloys in 1M NACl
  • Critical Crevice Corrosion Temperature (CCT)
    for various alloys in 10% FeCl3

Intergranural Corrosion
2507's low carbon content greatly lowers the risk of carbide precipitation at the grain boundaries during heat treatment; therefore, the alloy is highly resistant to carbide-related intergranular corrosion.
Stress Corrosion Cracking
The duplex structure of 2507 provides excellent resistance to chloride stress corrosion cracking (SCC). Because of its higher alloy content, 2507 is superior to 2205 in corrosion resistance and strength. 2507 is especially useful in offshore oil and gas applications and in wells with either naturally high brine levels or where brine has been injected to enhance recovery.
Pitting Corrosion 
Different testing methods can be used to establish the pitting resistance of steels in chloride-containing solutions. The data above were measured by an electrochemical technique based on ASTM G 61. The critical pitting temperatures (CPT) of several high-performance steels in a 1M sodium chloride solution were determined. The results illustrate the excellent resistance of 2507 to pitting corrosion. The normal data spread for each grade is indicated by the dark gray portion of the bar.
Crevice Corrosion
The presence of crevices, almost unavoidable in practical constructions and operations, makes stainless steels more susceptable to corrosion in chloride enviroments. 2507 is highly resistant to crevice corrosion. The critical crevice corrosion temperatures of 2507 and several other high-performance stainless steels are shown above.

Chemical Analysis
Typical values (Weight %)

C Cr Ni Mo N Others
0.0202574.0.27S=0.001
PREN = [Cr%] + 3.3 [Mo%] + 16 [N%] ≥ 40

Mechanical Properties
Mechanical and Physical Properties 
2507 combines high tensile and impact strength with a low coefficient of thermal expansion and high thermal conductivity. These properties are suitable for many structural and mechanical components. The low, ambient, and elevated temperature mechanical properties of 2507 sheet and plate are shown below. All of the test data shown are for samples in the annealed and quenched condition.

2507 is not recommended for applications which require long exposures to temperatures in excess of 5700F because of the increased risk of a reduction in toughness. The data listed here are typical for wrought products and should not be regarded as a maximum or minimum value unless specifically stated.

Mechanical Properties

Ultimate Tensile Strength, ksi116 min.
0.2% Offset Yield Strength 0.2%, ksi80 min.
0.1% Offset Yield Strength 0.2%, ksi91 min.
Elongation in 2 inches, %15 min.
Hardness Rockwell C32 max.
Impact Energy, ft.-lbs.74 min.

Low Temperature Impact Properties

Temperature 0FRT34-4-40
Ft.-lbs.162162155140
Temperature 0F-76-112-148-320
Ft.-lbs.11044307

Elevated Temperature Tensile Properties

Temperature 0F68212302392482
0.2% Offset Yield Strength, ksi8065615855
Ultimate Tensile Strength, ksi116101989594

Physical Properties

Densitylb/in3


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