304L Stainless Steel Seamless Pipes & Tubes

The ASTM A312 TP 304LL Round Pipe is widely used across the world as it is highly cost-effective. These round pipes have excellent corrosion resistance properties due to the presence of chromium in their composition. The SA 312 TP 304LL ERW Pipe is designed with a fusion weld. These welds enable the pipe to be very durable and easy to maintain. Most pipes are hot or cold-rolled. The SS Grade 1.4306 Polished Pipe is very smooth and appealing due to its excellent finish. As a result, these pipes offer more protection and resistance against various elements. DIN 1.4306 Tubing is very successful across the world in dealing with intergranular corrosion and pitting due to various chlorides and sulfides. If you have any queries or want to know more about our AISI 304LL Square Pipe which can be easily fitted in compact spaces, contact us.
304L Stainless Steel Pipes and Tubes Product Range
304L Stainless Steel Pipes and Tubes Specifications:
ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790
304L Stainless Steel Pipes and Tubes Sizes (Seamless):
1/2” NB - 16” NB
304L Stainless Steel Pipes and Tubes Sizes (ERW): 1/2”
NB - 24” NB
304L Stainless Steel Pipes and Tubes Sizes (EFW): 6”
NB - 100” NB
304L Stainless Steel Pipes and Tubes Wall Thickness
available:
Schedule 5S - Schedule XXS (heavier on request)
NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc.

All Pipes is manufactured and inspected/tested to the relevant standards including ASTM, ASME and API etc.
Type 304L Stainless Steel has excellent welding and deep drawing
characteristics - it is easy to fabricate, easy to clean and aesthetically pleasing to the eye. The steel is common throughout industry particularly in food processing as the material is not susceptible to corrosion from acids found in common foodstuffs. As a consequence, such steel is ideal for items such as sinks, work surfaces, preparation areas and refrigerators. It is also a perfect material for use in the pharmaceutical industry for environments such as clean rooms. Grade 304L can also be found in heat exchangers, chemical containers, pipelines and throughout the brewing industry. It can be used as a fabricated material where high temperature petroleum gases or steam production gases are stored such as pressure vessels. It can even be found extensively in the construction industry where the material is used for cosmetic purposes such as building fascias. 304L & 304LL plate and pipes have similar properties and in certain cases are stocked with Dual Certification, where it is concluded that each item has properties and a composition which comply with both steel types. Grade 304LH cannot be included in this equation due to the steel's higher carbon content which is intended for use in elevated temperature applications. |
304L Stainless Steel Pipes and Tubes Composition
Typical compositional ranges for grade 304L stainless steels are given in table 1.
Table 1. Composition ranges for 304L grade stainless steel
Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
---|---|---|---|---|---|---|---|---|---|---|
304L | min. | - | - | - | - | - | 18.0 | - | 8.0 | - |
max. | 0.08 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 10.5 | 0.10 | ||
304LL | min. | - | - | - | - | - | 18.0 | - | 8.0 | - |
max. | 0.030 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 12.0 | 0.10 | ||
304LH | min. | 0.04 | - | - | - | - | 18.0 | - | 8.0 | - |
max. | 0.10 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 10.5 |
304L Stainless Steel Pipes and Tubes Mechanical
Properties
Typical mechanical properties for grade 304L stainless steels are given in table 2.
Grade | Tensile Strength (MPa) min |
YieldStrength 0.2% Proof (MPa) min |
Elongation (%in 50mm) min |
Hardness
|
|
Rockwell B (HR B) max | Brinell (HB) max | ||||
304L | 515 | 205 | 40 | 92 | 201 |
304LL | 485 | 170 | 40 | 92 | 201 |
304LH | 515 | 205 | 40 | 92 | 201 |
304LH also has a requirement for a grain size of ASTM No 7 or coarser. |

Typical physical properties for annealed grade 304L stainless steels are given in table 3.
Table 3. Physical properties of 304L grade stainless steel in the annealed condition
Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) | |||
---|---|---|---|---|---|---|---|---|---|
0-1000C | 0-3150C | 0-5380C | at 1000C | at 5000C | |||||
304L/L/H | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |

Approximate grade comparisons for 304L stainless steels are given in table 4.
Table 4. Grade specifications for 304L grade stainless steel
Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
BS | En | No | Name | ||||
304L | S304L00 | 304LS31 | 58E | 1.4301 | X5CrNi18-10 | 2332 | SUS 304L |
304LL | S304L03 | 304LS11 | - | 1.4306 | X2CrNi19-11 | 2352 | SUS 304LL |
304LH | S304L09 | 304LS51 | - | 1.4948 | X6CrNi18-11 | - | - |
These comparisons are approximate only. The list is intended as a comparison of
functionally similar materials not as a schedule of contractual equivalents. If
exact equivalents are needed original specifications must be consulted.
|
304L Stainless Steel Pipes and Tubes Corrosion
Resistance
Excellent in a wide range of atmospheric environments and many corrosive media.
Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion
cracking above about 600C. Considered resistant to potable water with up to about 200mg/L chlorides
at ambient temperatures, reducing to about 150mg/L at 600C.
|

Good oxidation resistance in intermittent service to 8700C and in continuous
service to 9250C. Continuous use of 304L in the 425-8600C range is not recommended if subsequent
aqueous corrosion resistance is important. Grade 304LL is more resistant to carbide precipitation and
can be heated into the above temperature range.
Grade 304LH has higher strength at elevated temperatures so is often used for structural and pressure-containing applications at temperatures above about 5000C and up to about 8000C. 304LH will become sensitised in the temperature range of 425-8600C; this is not a problem for high temperature applications, but will result in reduced aqueous corrosion resistance. |

Solution Treatment (Annealing) - Heat to 1010-11200C and cool rapidly. These grades cannot be hardened by thermaltreatment. |