ASTM A312 TP304L Stainless Steel Seamless Pipe SS Pipe DN10 - DN400
Steel Pipe
Standard: ASTM A249, ASTM A268, ASTM A269, ASTM A312, etc.
Material: 304L
Outer diameter: DN10 - DN400
Wall thickness: SCH 5S- XXS
Length: 6m/pcs or as request
Surface: Pickled, annealed, polished, bright, sand blast, hair
line, etc.
There are hundreds of different grades of stainless steel on the
market. Each of these unique formulations of stainless steel offer
some degree of corrosion resistance above and beyond that of plain
steel.
The existence of these stainless steel variants can cause some
confusion—especially when the names & formulations of two stainless
steel alloys are almost the same. This is the case with grade 304
and 304L stainless steel.
| Composition Table | Grade 304 SS Chemical Content by % | Grade 304L SS Chemical Content by % |
| Carbon | 0.08 Max | 0.03 Max |
| Chromium | 18.00-20.00 | 18.00-20.00 |
| Iron | Makes up the Balance | Makes up the Balance |
| Manganese | 2.00 Max | 2.00 Max |
| Nickel | 8.00-12.00 | 8.00-12.00 |
| Nitrogen | 0.10 Max | 0.10 Max |
| Phosphorus | 0.045 Max | 0.045 Max |
| Silicon | 0.75 Max | 0.75 Max |
| Sulfur | 0.030 Max | 0.030 Max |
These two alloys are remarkably similar—but there is one key
difference. In grade 304 stainless, the maximum carbon content is
set at 0.08%, whereas grade 304L stainless steel has a maximum
carbon content of 0.03%. The “L” in 304L can be interpreted as
meaning extra-low carbon.
This difference of 0.05% carbon content produces a slight, but
marked, difference in the performances of the two alloys
The Mechanical Difference
Grade 304L has a slight, but noticeable, reduction in key
mechanical performance characteristics compared to the “standard”
grade 304 stainless steel alloy.
For example, the ultimate tensile strength (UTS) of 304L is roughly
85 ksi (~586 MPa), less than the UTS of standard grade 304
stainless, which is 90 ksi (~620 MPa). The difference in yield
strength is slightly greater, with 304 SS having a 0.2% yield
strength of 42 ksi (~289 MPa) and 304L having a 0.2% yield strength
of 35 ksi (~241 MPa).
This means that if you had two steel wire baskets and both baskets
had the exact same design, wire thickness, and construction, the
basket made from 304L would be structurally weaker than the
standard 304 basket.
Why Would You Want to Use 304L, Then?
So, if 304L is weaker than standard 304 stainless steel, why would
anyone want to use it?
The answer is that the 304L alloy’s lower carbon content helps
minimize/eliminate carbide precipitation during the welding
process. This allows 304L stainless steel to be used in the
“as-welded” state, even in severe corrosive environments.
If you were to use standard 304 stainless in the same way, it would
degrade much faster at the weld joints.
Basically, using 304L eliminates the need to anneal weld joints
prior to using the completed metal form—saving time and effort.
In practice, both 304 and 304L can be used for many of the same
applications. The differences are often minor enough that one isn’t
considered massively more useful over the other. When stronger
corrosion resistance is needed, other alloys, such as grade 316
stainless steel, are usually considered as an alternative.
Other Products Type of Our Stainless Steel
| Name | Type | Surface | Diameter range | Note |
| Stainless steel pipe | welded pipe for industrial | 2B / NO.1 | 10 - 1220mm | welded by strips |
| polished welded pipe | bright | 10 - 114mm | polished outside |
| square pipe / rectangle pipe | polished/ unpolished | 8*8 - 200*200 | welded by strips |
| seamless pipe | pickling | 6 - 508mm | seamless pipe |
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