C&N Industiral,huitong limtied is professional pipe,flange and fitting manufacturer,our products approved by PDO, SADARA, SWCC,PDO etc.
what is the F51？
F51 is a duplex stainless steel with a 50:50 austenite, ferrite microstructure. The material combines good
mechanical strength and ductility with moderate to good corrosion resistance in a variety of environments. This material is generally supplied in the annealed condition giving yield strengths in excess of 65 KSI(450Mpa), this material cannot be hardened by heat treatment but stronger surface strengths can be achieved by cold working. Typical applications include pumps, valves, pipework, flanges etc together with various applications in the oil and gas, brewing, power generation and chemical engineering industries. In fact this alloy can be used successfully as an alternative to 300 series austenitic stainless steels in almost all applications where higher mechanical strength/lower weight is required.
Related Specifications :
EN10088-3 X2CrNiMoN22-5-3
ASTM A182 F51
W.Nr. 1.4462
NORSOK D41 to D45
About processing procedures and requirements
Forging——Forging temperature for this material should be 1100 – 1250oC Reheat as often as necessary and cool in still air.
Machining——Material in the annealed condition is readily machinable by all conventional methods.
Welding——F51 is readily weldable using many of the standard electric arc welding processes but oxyacetylene welding is not recommended because carbon pickup in the weld metal may occur.
Heat Treatment——Anneal – Heat to 1020 – 1120oC ensuring sufficient time is allowed for the centre to achieve furnace temperature and hold for a time commensurate with the ruling section, followed by water quenching.
Typical Chemical composition
| PREn = Pitting Resistance Equivalent PREn= Cr% + 3.3Mo% + 16N% | Carbon 0.03% Max | Carbon 0.03% Max |
| Silicon 1.00% Max | Silicon 1.00% Max | |
| Manganese 2.00% Max | Manganese 2.00% Max | |
| Phosphorous 0.035% Max | Phosphorous 0.035% Max | |
| Sulphur 0.015% Max | Sulphur 0.015% Max | |
| Chromium 21.0 – 23.0% | Chromium 21.0 – 23.0% | |
| Nickel 4.5 – 6.5% | Nickel 4.5 – 6.5% | |
| Molybdenum 2.5 – 3.5% | Molybdenum 2.5 – 3.5% | |
| Nitrogen 0.10 – 0.20% | Nitrogen 0.10 – 0.20% | |
| PREn >34 | PREn >34 |
Mechanical Property Requirements – Annealed condition
| Yield | Tensile Strength | Elongation | Charpy Impact @ Rt J | Hardness |
| >450Mpa (65KSI) | 650 – 800Mpa (94 – 128KSI) | 25% | 100 | 270HB Max |
Applications
Pressure Systems.
Flanges
Valves Fittings
Couplings
Rings
Shafts
Forgings.
Quality assurance
We ensure that all our materials go through strict quality tests before dispatching them to our clients. No matter what kind of pipe fitting product
• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Flattening Test
• Micro and MacroTest
• Pitting Resistance Test
• Flaring Test
• Intergranular Corrosion (IGC) Test
