Characteristics of ASTM A182 F51 Forged Steel Flange

ASTM A182 F51 Forged Steel Flange is a duplex stainless steel flange. Flange is a part that connects the shaft to the shaft and is used to connect the ends of the pipe. Flange is also used on the inlet and outlet of equipment to connect the two devices.

ASTM A182 F51 is an American standard stainless steel material. It is a Ferrite-Austenitic stainless steel. The ideal metallographic structure of duplex stainless steels is 50% ferrite and 50% austenite respectively. Generally, the minimum phase content should reach 30%. It has the advantages of both austenitic stainless steels and ferritic stainless steels.  Austenitic stainless steels have no or weak magnetic field, while duplex steels are magnetic. Duplex stainless steel is characterized by both stainless steel and carbon steel. It combines the beneficial properties of ferrite and austenite, has good resistance to chloride ion stress corrosion and sulfide stress corrosion as well as high mechanical strength.

Chemical Requirements for ASTM A182 F51

Tensile and Hardness Requirements

• Tensile Strength, min.: 620MPa

• Yield Strength, min.: 450MPa
  

• Elongation in 2 in. or 50 mm (or 4D), min, %: 25
  

• Reduction of Area, min, %: 45
  

Difference between Duplex Stainless and Austenitic Stainless:

1. Sufficient plasticity toughness for forming: Yield strength is more than twice as high as that of common austenitic stainless steel, and it has sufficient plastic toughness for forming. The wall thickness of tanks or pressure vessels made of duplex stainless steel is 30-50% less than that of commonly used austenite, which helps to reduce costs. 

2. The stress corrosion: It has excellent resistance to stress corrosion cracking. Even duplex stainless steels with the lowest amount of alloys have higher resistance to stress corrosion cracking than austenitic stainless steels, especially in the environment containing chloride ions. 

3. The corrosion resistance: The corrosion resistance of duplex stainless steel is better than that of common austenitic stainless steel in many media. Super duplex stainless steel has extremely high corrosion resistance. 

4. Engineering significance: It has lower linear expansion coefficient than austenitic stainless steel and is close to carbon steel. It is suitable for connecting with carbon steel and has important engineering significance, such as producing composite plates and linings. 

5. Impact Resistance: Compared with austenitic stainless steel, duplex stainless steel has higher energy absorption capacity under dynamic or static load. It has obvious advantages in coping with unexpected accidents such as impact, and has practical application value.

Applications of ASTM A182 F51

• Pressure vessels, high pressure storage tanks, high pressure piping, heat exchangers (chemical processing industry).

• Oil and gas pipelines and heat exchanger pipes.

• Sewage treatment system.

• Pulp and paper industry classifiers, bleaching equipment, storage and treatment systems.

• Rotating shaft, press roll, blade, impeller etc. in high strength and corrosion resistant environment.

• Food Processing Equipment

• Cargo boxes for ships or trucks

We(Shanghai Zhucheng Pipe Fittings Manufacturing Co Ltd) is professional engaged in manufacture of Steel pipe(seamless/welded), pipe fittings(butt welding, socket weld, threaded) and flanges in pipe system of all kinds of materials(carbon steel, stainless steel, alloy steel, low temp steel, pipeline steel).  In order to get to a successful cooperation with customers, normally we are willing to provide free samples to all customers if required. (The customer should be responsible for the freight and the samples should be in common size and materials)