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Hastelloy is a nickel-based corrosion-resistant alloy, which is mainly divided into nickel-chromium alloy and nickel-chromium-molybdenum alloy. Hastelloy has good corrosion resistance and thermal stability, and is used in aviation and chemical fields. Hastelloy is the general name for the commercial grades of nickel-based corrosion-resistant alloys produced by Hastelloy International.
Hastelloy B3 N10675 Hastelloy Overview:
Hastelloy B3 (N10675) is a nickel-based superalloy consisting of
nickel, molybdenum, cobalt and other elements with a nickel content
of about 65%. Hastelloy B3 (N10675) nickel-based alloy material is
a new material based on Hastelloy B2, which improves the thermal
stability of the material, thereby improving the corrosion
resistance and improving the hot forming and cold forming
properties. In recent years, it has been increasingly used in the
manufacture of chemical equipment.Hastelloy B3 alloy is a NI-MO
corrosion-resistant alloy, also a low-carbon alloy, to solve the
technical problems caused by insufficient stability, while
retaining the corrosion resistance of B2, so that B2 can be cracked
in the welding crack and process solve. Hastelloy B3 has better
corrosion resistance than B2. It has good corrosion resistance at
any temperature and concentration of HCl. It also has good
corrosion resistance to H2SO4, CH3COOH, formic acid, H3PO4 and
other non-oxidizing media. . Moreover, due to the adjustment of its
chemical composition, its thermal stability is significantly
improved compared to B2, which is highly resistant to pitting
corrosion, stress corrosion cracking, knife corrosion and corrosion
in the heat affected zone of welding. Resistance. The tendency of
the formation of a harmful phase between metals is small, making it
more tough than B-2 during heating and subsequent various forms of
thermal cycling.
Hastelloy B3 Hastelloy grades and standards:
Hastelloy B3 Hastelloy US grade: UNS N10675 German grade 2.4600 NIcrofer6628
Complete specifications, stock in stock
Strip, sheet (thick plate, medium plate, sheet, steel plate), bar (black bar, light bar, grinding bar, round bar, square bar, steel bar), pipe (capillary, seamless pipe, steel pipe), Forgings (flanges, elbows, bolts, nuts, tees), welding consumables (welding rods, welding wire, welded pipes), wire and other materials.
Chemical Composition Of Hastelloy B3
C≤ | Si≤ | Mn≤ | P≤ | S≤ | Cr≥ | Ni≥ | Mo≥ | Cu≤ |
0.01 | 0.10 | 3.00 | 0.030 | 0.010 | 1.00-3.00 | 65.0 | 27.0-32.0 | 0.20 |
Al≤ | Ti≤ | Fe≤ | Co≤ | V≤ | W≤ | Nb/Ta≤ | Ta≤ | |
0.50 | 0.20 | 1.00-3.00 | 3.00 | 0.20 | 3.00 | 0.20 | 0.20 |
Hastelloy B3 (N10675) Hastelloy main characteristics and welding
and processing:
1. Material analysis: The mechanical properties of Hastelloy B3
(N10675) Hastelloy sheet in solid solution state: as the heating
temperature increases, its tensile strength, yield strength and
elastic modulus decrease, while elongation, thermal expansion
coefficient, thermal conductivity and The specific heat is slightly
increased; while the cold deformation rate increases, the hardness,
tensile strength and yield strength increase, and the elongation
decreases.
Forming and processing characteristics: After analysis, the forming
and processing characteristics of Hastelloy B3 mainly include:
(1) The Hastelloy B3 material has a high elongation and creates
favorable conditions for cold forming.
(2) Hastelloy B3 material is harder than austenitic stainless
steel, and the work hardening tendency is more obvious, so more
pressure is required in cold forming, or step forming.
(3) When the cold forming deformation rate of Hastelloy B3 material
is less than 10%, it will not affect the corrosion resistance of
the workpiece, but in the welding process, the existence of
residual stress may cause thermal cracking to the weld. Therefore,
for workpieces that require welding at a later stage, the effects
of residual stress should be eliminated as much as possible.
(4) Cold deformation with severe deformation will increase the
yield ratio of Hastelloy B3 material and increase the sensitivity
of stress corrosion and cracking. Intermediate and final heat
treatment processes are often used.
(5) Hastelloy B3 material is very sensitive to oxidizing medium and
sulfur, phosphorus, lead and other low melting point metals at high
temperatures.
(6) In the interval of 600 to 800 °C, the heating time is too long,
and the Hastelloy B3 alloy will produce a brittle phase, which
leads to a decrease in elongation, and when the external force or
deformation is limited in this temperature range, hot cracking is
likely to occur. Therefore, when thermoforming is used, the
temperature must be controlled above 900 °C.
(7), before the processing of Hastelloy B3 material, the surface of
the mold that is in contact with the workpiece is cleaned; when
cold working, the lubrication method can be used, and it must be
degreased or cleaned with alkali immediately after forming.
(8) After the workpiece is cooled by water, the oxide film on the
surface is thicker and should be fully pickled. If there is an
oxide film remaining, cracks may occur during the next pressing; if
necessary, sandblasting may be performed before pickling.
Welding and forming:
(1) Before the forming process, if the raw material needs to be
spliced, it is better to choose the tungsten argon arc welding
(GTAW) welding method, so as to better protect the weld from
oxidation. If manual arc welding is used, It is easy to cause the
intermediate weld bead to be oxidized. Even if each layer is
polished and cleaned, it is difficult to ensure thorough cleaning,
and there is a slight residual of oxide layer, which may also
affect the forming processability of the weld. Before the workpiece
is welded, the deposits and oxide layers on the groove and the base
metal surface must be removed, because the presence of oxide film
and impurities affects the performance of the weld and heat
affected zone. It is best to use a small current for welding, to
avoid too slow speed, no swing, the interlayer temperature is
controlled below 100 °C, and the argon gas protection on both sides
is used to avoid high temperature oxidation of alloying elements.
The surface of the weld should be smoothed before pressing, and the
thick oxide layer on the weld surface should be removed and acid
washed. Because the oxide layer of the Hastelloy B3 material weld
is very hard, it is difficult to remove by direct pickling, and it
is easy to produce fine cracks during the press forming process,
which affects the performance of the weld.
(2) The advantage of thermoforming is that it can be formed at one
time, which can avoid work hardening. If the forming temperature
can be controlled well, heat treatment can be avoided. However, the
temperature changes greatly during the hot forming process, and
each area is different. Even the surface directly in contact with
the mold may be much lower than the temperature inside the metal,
which is difficult to measure and control. Once the local material
enters the sensitive process during the processing. In the
temperature zone, defects such as microcracks are generated, which
is difficult to eliminate in the late solution heat treatment.
Drawing on the experience of the processing plant, the cold forming
process was chosen. The pressing method is preferably molded, and
it is necessary to use cold spinning when spinning, or warm
spinning without temperature exceeding 400 °C.
(3) In the cold forming process, a step forming process is adopted
when the deformation rate is large. For step-by-step forming,
intermediate heat treatment is required, and solid solution heat
treatment is preferred, and the temperature is controlled above
1000 °C. The solution heat treatment process is selected, and the
temperature reaches 1060 to 1080 °C. After the final processing of
the workpiece, a solution heat treatment is performed again to
eliminate residual stress and avoid affecting the subsequent
welding quality.
heat treatment:
It is important that Hastelloy B3 (N10675) Hastelloy should always
keep the workpiece clean and free of contamination before and
during heat treatment. During the heating process, the workpiece
should not be exposed to sulfur, phosphorus, lead and other
low-melting metals, otherwise the properties of the alloy will be
impaired and the alloy will become brittle. The heating furnace is
preferably an electric furnace. For example, if the gas or oil
burner is used, the sulfur content in the fuel is as low as
possible. According to the material manufacturer, the total sulfur
content in the natural gas and the liquefied petroleum gas is not
more than 0.1% (V). The sulfur content in the city gas is not more
than 0.25g/m3, and the sulfur content in the fuel oil should be
less than 0.5% (W).
The furnace gas must be clean and micro-reducing is suitable. The
furnace gas should be prevented from fluctuating between oxidizing
and reducing properties, and the heating flame cannot directly
contact the workpiece. The workpiece must be supported before
entering the furnace to avoid bad deformation at high temperatures.
The workpiece heating rate is as fast as possible, and the
workpiece must be placed in the furnace after the furnace
temperature reaches the heat treatment temperature. After the
furnace is discharged, it should be quickly water-cooled. It should
be sprayed evenly by immersion method or full area. It is strictly
forbidden to use water pipe pouring to prevent uneven heat and
cold, resulting in abnormal deformation or tear.
Specifications
Product Name | Alloy steel bar pipe plate wire coil |
Production Process | Cold Drawn,Cold Rolled,Hot Rolled,Bright Anneal etc |
Size | 5.5-800mm(Hot rolled), 2-50mm(Cold drawn),110-500mm(Forged) |
Standard | ASTM EN DIN GB ISO JIS |
Tolerance | +/-0.05 ~+/0.02 |
Surface
| Pickling,Bright; No.1,2B,No.4,BA,8K
Satin,Brush,Hairline,Mirror,Polished 180 grits,320 grits,400 grits,600 grits,800 grits polished |
Application | Constructions feilds and ship building industries Petroleum,Chemical industries,War and electiciy industries. Food processing and medical industries. Boiler heat cxchangers,Machinery and hardware feilds. |
Materials | Titanium alloy:TI-6AL-4V,TI-5AL-2.5SN,TA1,TA2,TA3,TA4,TA0,TC4 200series:201 202 |
Hastelloy B-3 application
HASTELLOYB-3 alloy can be used for all previous B-2 alloy
applications. Like the B-2 alloy, B-3 is not recommended for use in
environments where ferric salts and copper salts are present, as
these salts can quickly cause corrosion damage. When hydrochloric
acid comes into contact with iron and copper, it will chemically
react with it to form a ferric salt and a divalent copper salt.
Hastelloy B3 (N10675) Hastelloy specifications and supply status:
1. Variety classification: Shanghai haosteel can produce various specifications of Hastelloy B3 seamless pipe, Hastelloy B3 steel plate, Hastelloy B3 round steel, Hastelloy B3 forging, Hastelloy B3 flange, Hastelloy B3 ring, Hastelloy B3 welded pipe, Hastelloy B3 steel Belt, Hastelloy B3 wire and matching welding consumables.
2, delivery status: seamless pipe: solid solution + acid white, length can be fixed; sheet: solid solution, pickling, trimming; welded pipe: solid solution acid white + RT% flaw detection, forgings: annealing + car light; The bar is in the state of forging, surface polishing or car light; the strip is cold-rolled, solid solution soft, and descaled; the wire is solid-dissolved and acid-washed, or straight, solid solution Light state delivery.