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ASTM A312 Standard
ASTM A312 is the core standard published by the American Society
for Testing and Materials (ASTM) for austenitic stainless steel
pipes, widely used in high-temperature and general corrosive
environments worldwide. This standard strictly specifies the
manufacturing process, chemical composition, mechanical properties
(such as tensile strength and yield strength), and comprehensive
testing requirements for seamless pipes, straight seam welded
pipes, and heavily cold worked welded pipes. Every pipeline that
meets the A312 standard must undergo rigorous hydrostatic testing
or non-destructive testing to ensure its pressure bearing capacity
and structural integrity. Choosing products that comply with ASTM
A312 standards means choosing internationally recognized quality
and safety commitments for your pipeline system, which is a solid
guarantee for ensuring the long-term stable operation of the
project.
316L Material Characteristics
The most significant feature of 316L is the addition of molybdenum
(Mo) element. This key improvement has given it far superior
resistance to corrosion caused by chlorides (such as seawater and
salt spray environments) compared to 304 stainless steel,
especially in preventing pitting and crevice corrosion. The "L" in
the brand represents Low Carbon, which means that it can still
effectively resist intergranular corrosion after welding, ensuring
the durability of the welding area. 316L has become the preferred
material for high demand industries such as chemical processing,
marine engineering, pharmaceuticals, and food processing, and is an
ideal choice to ensure equipment safety and reliability in harsh
environments.
Material | Chemical Composition % Max ASTM A312 | ||||||||
C | Mn | P | S | Si | Cr | Ni | Mo | Ti | |
TP304 | 0.08 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | 8.0-11.0 | - | - |
TP304L | 0.035 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | 8.0-13.0 | - | - |
TP316 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 11.0-14.0 | 2.00-3.00 | - |
TP316L | 0.035 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | - |
TP321 | 0.08 | 2 | 0.045 | 0.03 | 1 | 17.0-19.0 | 9.0-12.0 | - | 5C -0.70 |
TP347 | 0.08 | 2 | 0.045 | 0.03 | 1 | 17.0-19.0 | 9.0-13.0 | - | - |
The Technological Advantages of Seamless Pipes:
Seamless stainless steel pipes are formed from solid billets
through processes such as perforation, hot rolling, cold drawing,
or cold rolling, and the pipe body itself has no welds. This
seamless structure is its core advantage. Firstly, seamless pipes
can withstand higher pressure and temperature than welded pipes of
the same specification, have uniform mechanical strength, and have
no weak points related to welds. Secondly, due to the absence of
structural differences in the weld seam area, its corrosion
resistance is more balanced and consistent, fundamentally
eliminating the risk of preferential corrosion of the weld seam.
Therefore, in critical applications such as oil, natural gas,
chemical, and electricity that require extreme safety and
durability, seamless pipes are the only reliable choice to ensure
long-term, trouble free operation of pipeline systems.
SMLSCO Inventory Advantage: massive 6-meter spot goods, lightning delivery
As a leading global supplier of stainless steel pipeline products,
SMLSCO's core competitiveness lies in our service commitment of
"large inventory, fast delivery". We have 2000ton inventory of
seamless pipes in stock, with complete size specifications,
especially the internationally recognized 6-meter standard length,
which can perfectly match your project needs and greatly optimize
container shipping efficiency. By choosing SMLSCO, you will bid
farewell to long production schedules. Our spot inventory means we
can immediately respond to your orders and achieve lightning fast
delivery. This can effectively help global inventory and
distribution partners reduce capital occupation, respond quickly to
the market, and gain opportunities.