Quick Details
- Standard:
JIS, AiSi, ASTM, GB, DIN, EN
- Place of Origin:
China
- Model Number:
ASTM A312
- Type:
Seamless
- Steel Grade:
300 Series
- Application:
industry
- Welding Line Type:
Seamless
- Certification:
ISO
- Dimensions:
1-1500mm
- Material:
Nickle Material
Packaging & Delivery
- Selling Units:
- Single item
- Single package size:
- 12X12X12 cm
- Single gross weight:
- 1.000 kg
- Package Type:
Carton or Wooden Box or as required.
1.Introduction
ASTM A312 is a Ni-Cr based superalloy that possesses high strength properties and resistance to elevated temperatures. It also
demonstrates remarkable protection against corrosion and oxidation. Its ability to withstand high
stress and a wide range of temperatures, both in and out of water, as well as being able to resist corrosion while being exposed to highly acidic environments makes it a fitting choice for nuclear and marine applications.
Inconel ASTM A312 was developed in the 1960s with the purpose of creating a material
that
could be used for steam-line piping. Some modifications were made to its original
composition that have enabled it to be even more creep-resistant and weldable.
2.Chemistry
Some chemical properties of Inconel ASTM A312 include:
Inconel ASTM A312 was designed as a solid solution strengthened material with no
significant
microstructure. This holds true at low and high temperatures, but there is a region
(923 to 1148 K) where precipitates form that are detrimental to the creep properties,
and thus the strength, of the alloy. Under any creep conditions (high temperature
with an applied stress), M23C6-type carbides form at the grain boundaries. When
tested at 973 K, γ” precipitates begin forming. These γ” phase
precipitates are
ordered A3 B type with a composition of Ni3(Nb, Al, Ti) and a tetragonal crystal structure.
They form a disk-shaped morphology and are coherent with respect to the matrix.
When tested at 998 K, a δ-phase precipitate begins forming which consist of Ni3(Nb, Mo)
in an orthorhombic crystal structure. They form in a needle-like morphology and are
incoherent with the matrix. Both of these precipitates can be
completely dissolved back
into the matrix when the sample is heated 1148 K. This leads to the
ability to recover creep
properties of the alloy to prolong the materials lifetime.
3.ASTM (American Society for Testing and Materials) for various
products made
out of Inconel ASTM A312 are as follow:
| Pipe Seamless | Pipe Welded | Tube Seamless | Tube Welded | Sheet/Plate | Bar | Forging | Fitting | Wire |
|---|
| B444 | B705 | B444 | B704 | B443 | B446 | – | – | – |
4.specifications
Specifications and certifications include:
- AMS: 5599, 5666
- MS: 5837
- ASME: SB 443 Gr 1, SB 446 Gr 1
- ASTM: B 443 Gr 1, B 446 Gr 1
- EN: 2.4856
- ISO: 15156-3
- NACE: MR0175-3
- UNS: N06625
- Werkstoff: 2.4856
5.Heat Treatment
Heat Treatment Inconel 725 is usually strengthened by cold work,
with annealing at
temperatures between 1,700 and 1,900F as required to remove the effects of cold work.
Although nominally a solid-solution alloy containing intergranular and intragranular
carbide precipitates, Inconel 725 is not responsive to
strengthening heat treatments.
Solution heat treating at 2000 to 2200F dissolves almost all of the
secondary carbides.
The major effects of short-time annealing of hot-rolled bar of standard composition are
to affect reductions in tensile strength and hardness.Typically, the annealing heat
treatment most utilized for Inconel 725 is at 1800F.
The mild annealed low carbon ASTM A312 has been widely used in the
chemical
process industry. Its good corrosion resistance and high strength make it a thinner
structural component.The ASTM A312 alloy can be used in contact with sea water and under
high mechanical stress.Typical applications:
1. Components of the chlorinated organic chemical process,
especially in the use
of acidic chlorides catalysts.
2. Used for cooking machines and bleaching ponds in the pulp and
paper industry
3. Absorption tower, reheater, flue gas inlet baffle, fan (moist),
agitator, guide plate
and flue pipe in flue gas desulfurization system.
4. Equipment and components for manufacturing applications in
acidic gas environments
5. Acetic acid and acetic anhydride reaction generators
6. Sulfuric acid condenser
