ASME SA387 Gr.2 Cl.2 Alloy Steel Plates Precision Engineered for
Industrial Applications
Products Specification
| Product Name | SA387 GR12 CL2 Steel Plate |
| Thickness | 3mm~300mm,2mm-100mm is common thickness,also can customize |
| Width | 1000~3000mm,common width is 1250mm,1500mm,2000mm,2200mm |
| Length | 1000~12000mm,can as your request cut |
| Surface | Clean,finished, blasting and painting or as your request |
| Delivery | Hot Rolled, Controlled Rolling,Normalizing,Annealing,
Tempering,Quanching, Q+T |
| Packing | Steel Strapping,fixing in the Container,can customize |
| Thickness tolerance | ±0.3mm |
| Application | It is mainly used to make structural parts such as car girder,
beam, transmission shaft and car chassis parts, which can reduce
the weight of the parts. |
SA387 GR12 CL2 Alloy Steel Plate Product Information
1. Introduction
SA387 GR12 CL2 alloy steel plate stands as a paragon of engineered
excellence in the realm of industrial materials. Governed by the
ASME SA - 387/SA - 387M standard, this specialized alloy steel
plate, with its unique chromium - molybdenum composition, is
meticulously crafted to meet the most exacting demands of high -
stress, high - temperature industrial applications.
2. Key Advantages
2.1 Exceptional Thermal Stability
SA387 GR12 CL2 excels in withstanding extreme heat, maintaining its
structural integrity and mechanical performance even when exposed
to continuous service temperatures up to 480°C. This remarkable
thermal stability makes it an ideal choice for components in high -
temperature furnaces, where other materials might succumb to creep
and degradation over time.
2.2 Superior Corrosion Protection
Against a variety of aggressive chemicals and environmental
factors, this alloy steel plate demonstrates outstanding
resistance. It effectively combats hydrogen - induced corrosion, a
common and damaging issue in petrochemical processes, as well as
sulfide - related corrosion that can occur in environments with
sulfur - containing substances. This protection extends the
lifespan of equipment and reduces maintenance costs significantly.
2.3 Robust Mechanical Attributes
With a tensile strength ranging from 450 - 585 MPa, SA387 GR12 CL2
can bear heavy loads without failure. Its minimum yield strength of
275 MPa ensures that it can resist deformation under pressure,
safeguarding the reliability of structures and machinery.
Additionally, its impact resistance, capable of withstanding at
least 41 J of impact energy, provides an extra layer of safety,
enabling it to endure sudden shocks and vibrations.
3. Chemical Makeup
The chemical composition of SA387 GR12 CL2 is a precisely
calibrated blend:
- Carbon (C): Ranging from 0.04 - 0.17%, carbon plays a pivotal role
in determining the steel's hardenability and strength. The
optimized content in this alloy strikes a perfect balance between
enhancing mechanical properties and maintaining workability.
- Silicon (Si): At 0.13 - 0.45%, silicon contributes to deoxidizing
the steel during production, improving its purity and also
enhancing its strength and resistance to oxidation at elevated
temperatures.
- Manganese (Mn): With a content of 0.35 - 0.73%, manganese boosts
the steel's hardenability and improves its overall strength and
toughness, making it more adaptable to various manufacturing
processes.
- Phosphorus (P): Limited to ≤0.035%, phosphorus is carefully
controlled as an impurity. Keeping its levels low prevents
brittleness and ensures good formability during cold - working
operations.
- Sulfur (S): Similarly, sulfur, with a maximum content of ≤0.035%,
is minimized to avoid issues like hot - shortness during hot -
working and to improve the overall quality and performance of the
steel.
- Chromium (Cr): Accounting for 0.74 - 1.21%, chromium is a key
element that significantly enhances the steel's corrosion
resistance and contributes to its high - temperature strength,
protecting it from oxidation and chemical attack.
- Molybdenum (Mo): With 0.40 - 0.65%, molybdenum further elevates the
steel's high - temperature strength, creep resistance, and
resistance to corrosion in harsh chemical environments.
4. Mechanical Performance Details
Beyond the basic tensile and yield strengths, SA387 GR12 CL2
exhibits notable elongation characteristics. For plates with a
thickness of 50 mm or less, a minimum elongation of 22% is
achieved, while for plates between 50 - 200 mm, the minimum
elongation is 19%. This ductility allows for the fabrication of
complex shapes without the risk of premature cracking, facilitating
the creation of intricate industrial components.
5. Fabrication and Welding
5.1 Fabrication Processes
SA387 GR12 CL2 is highly amenable to a wide array of fabrication
techniques. For cutting operations, thin plates (up to 20 mm) can
be precisely cut using plasma or laser cutting methods, ensuring
clean and accurate edges with minimal heat - affected zones.
Thicker plates, from 20 - 30 mm, may require oxy - fuel cutting
with proper pre - heating to prevent cracking. For extremely thick
plates exceeding 30 mm, waterjet cutting offers a viable option,
providing a burr - free and heat - distortion - free cut.
5.2 Welding Considerations
Welding SA387 GR12 CL2 is straightforward, thanks to its good
weldability. Processes such as manual metal arc welding, submerged
arc welding, and gas metal arc welding can be employed. To ensure
successful welds, pre - heating the base metal to a temperature
range of 150 - 200°C is essential, which helps to reduce the risk
of cold cracking. Post - weld heat treatment, typically carried out
at 650 - 710°C, further enhances the mechanical properties of the
weld joint, improving its ductility and reducing residual
stresses.
6. Application Scenarios
6.1 Petrochemical Industry
In refineries, SA387 GR12 CL2 is extensively used in the
construction of hydrogen - rich reactors. These reactors operate
under high - pressure and high - temperature conditions, processing
hydrogen - based fuels and chemicals. The steel plate's resistance
to hydrogen - induced damage and its ability to maintain strength
over long periods of operation are critical for the safe and
efficient functioning of these vital pieces of equipment.
6.2 Power Generation
In thermal power plants, this alloy steel plate is utilized in the
manufacturing of boiler parts, including headers, tubesheets, and
pressure vessels. In the superheater sections of boilers, where
steam temperatures can reach extremely high levels, SA387 GR12
CL2's high - temperature stability ensures that the components can
withstand the intense heat and pressure, enabling reliable power
generation.
6.3 Chemical Processing
Chemical plants rely on SA387 GR12 CL2 for fabricating reactors and
vessels that handle corrosive chemicals. Whether it's in the
production of fertilizers involving sulfuric acid or in
pharmaceutical manufacturing with a variety of reactive substances,
the steel plate's corrosion resistance provides a secure
containment solution, protecting both the equipment and the
integrity of the chemical processes.
7. Quality Standards and Testing
Adhering strictly to the ASME SA - 387/SA - 387M standard, SA387
GR12 CL2 undergoes rigorous quality control measures. Non -
destructive testing methods, such as ultrasonic testing in
accordance with SA435/SA435M and SA577/SA577M, are employed to
detect any internal flaws or discontinuities in the steel plate.
Tensile and impact tests, as per SA370, are carried out to verify
its mechanical properties, ensuring that each batch meets the
stringent requirements for industrial use.
8. Delivery Conditions
By default, SA387 GR12 CL2 alloy steel plates are supplied in the
normalized and tempered condition, which optimizes their mechanical
properties. However, in line with customer specifications,
alternative delivery conditions such as normalizing, annealing, or
quenching and tempering can be arranged to meet specific
application requirements.
